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java.lang.RuntimeException: Unable to start activity ComponentInfo:android.view.InflateException

I am trying to create an Image Slider containing 4 images for my application and i've been running into the following errors. I've tried searching and have found similiar titles but the problems are different.
This is the logcat:
example.prgguru.com.wallit E/AndroidRuntime: FATAL EXCEPTION: main
Process: example.prgguru.com.wallit, PID: 32048
java.lang.RuntimeException: Unable to start activity ComponentInfo{example.prgguru.com.wallit/example.prgguru.com.wallit.MainActivity}: android.view.InflateException: Binary XML file line #3: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5653)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #3: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
at android.view.LayoutInflater.inflate(LayoutInflater.java:470)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at example.prgguru.com.wallit.MainActivity.onCreate(MainActivity.java:13)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2368)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5653)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.app.Fragment$InstantiationException: Trying to instantiate a class example.prgguru.com.wallit.MainActivityFragment that is not a Fragment
at android.app.Fragment.instantiate(Fragment.java:585)
at android.app.Fragment.instantiate(Fragment.java:561)
at android.app.Activity.onCreateView(Activity.java:5066)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:695)
at android.view.LayoutInflater.inflate(LayoutInflater.java:470)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at example.prgguru.com.wallit.MainActivity.onCreate(MainActivity.java:13)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2368)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5653)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException
at android.app.Fragment.instantiate(Fragment.java:585)
at android.app.Fragment.instantiate(Fragment.java:561)
at android.app.Activity.onCreateView(Activity.java:5066)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:695)
at android.view.LayoutInflater.inflate(LayoutInflater.java:470)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
at android.app.Activity.setContentView(Activity.java:2059)
at example.prgguru.com.wallit.MainActivity.onCreate(MainActivity.java:13)
at android.app.Activity.performCreate(Activity.java:5541)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2368)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2464)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5653)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
This is my Main Activity.java:
package example.prgguru.com.wallit;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
This is my activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:name="example.prgguru.com.wallit.MainActivityFragment"
android:id="#+id/fragment"
tools:layout="#layout/fragment_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#32383d">
<!-- ViewPager -->
<!-- Footer -->
<android.support.v4.view.ViewPager
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/imageviewPager" />
<include layout="#layout/footer"/>
</FrameLayout>
MainActivityFragment.java
package example.prgguru.com.wallit;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivityFragment extends Fragment {
private ViewPager _mViewPager;
private ImageViewPagerAdapter _adapter;
private ImageView _btn1, _btn2, _btn3,_btn4;
public MainActivityFragment() {
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setUpView();
setTab();
onCircleButtonClick();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main, container, false);
}
private void onCircleButtonClick() {
_btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
_btn1.setImageResource(R.drawable.fill_circle);
_mViewPager.setCurrentItem(0);
}
});
_btn2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
_btn2.setImageResource(R.drawable.fill_circle);
_mViewPager.setCurrentItem(1);
}
});
_btn3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
_btn3.setImageResource(R.drawable.fill_circle);
_mViewPager.setCurrentItem(2);
}
});
_btn4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
_btn4.setImageResource(R.drawable.fill_circle);
_mViewPager.setCurrentItem(3);
}
});
}
private void setUpView() {
_mViewPager = (ViewPager) getView().findViewById(R.id.imageviewPager);
_adapter = new ImageViewPagerAdapter(getActivity(), getFragmentManager());
_mViewPager.setAdapter(_adapter);
_mViewPager.setCurrentItem(0);
initButton();
}
private void setTab() {
_mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int position) {
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
_btn1.setImageResource(R.drawable.holo_circle);
_btn2.setImageResource(R.drawable.holo_circle);
_btn3.setImageResource(R.drawable.holo_circle);
_btn4.setImageResource(R.drawable.holo_circle);
btnAction(position);
}
});
}
private void btnAction(int action) {
switch (action) {
case 0:
_btn1.setImageResource(R.drawable.fill_circle);
break;
case 1:
_btn2.setImageResource(R.drawable.fill_circle);
break;
case 2:
_btn3.setImageResource(R.drawable.fill_circle);
break;
case 3:
_btn4.setImageResource(R.drawable.fill_circle);
break;
}
}
private void initButton() {
_btn1 = (ImageView) getView().findViewById(R.id.btn1);
_btn1.setImageResource(R.drawable.fill_circle);
_btn2 = (ImageView) getView().findViewById(R.id.btn2);
_btn3 = (ImageView) getView().findViewById(R.id.btn3);
_btn4 = (ImageView) getView().findViewById(R.id.btn4);
}
private void setButton(Button btn, String text, int h, int w) {
btn.setWidth(w);
btn.setHeight(h);
btn.setText(text);
}
}

Your Activity extends from Activity and not AppCompatActivity. But your fragment extends from android.support.v4.app.Fragment. You must use one type of fragment: from support library or normal one.
Try to change extends Fragment from android.app.Fragment in your fragment class.

fragments in viewpager, no view found error

I have an activity holding a fragment, in this fragment there is a button , when it is clicked, a dialog is popped out.
In this dialog, there is a Viewpager, which holds some fragments to display.
Here are the code and the error, please spare your valuable time to show me where I am wrong. I much appreciate your help.
MainActivity.class
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
MyFragment fragment = new MyFragment();
fragmentTransaction.add(R.id.container, fragment);
fragmentTransaction.commit();
}
}
MyFragment.class
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class MyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_sandbox, container, false);
Button button = (Button) v.findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
PagerDialog dialog = new PagerDialog(getActivity(),
getChildFragmentManager());
dialog.show();
}
});
return v;
}
}
PagerDialog.class
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class PagerDialog extends Dialog {
ViewPager mViewPager;
FragmentStatePagerAdapter mAdapter;
FragmentManager mFragmentManager;
public PagerDialog(Context context, FragmentManager fm) {
super(context);
mFragmentManager = fm;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog);
mViewPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new MyAdapter(mFragmentManager);
mViewPager.setAdapter(mAdapter);
}
private class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
return new DummyFragment();
}
#Override
public int getCount() {
return 2;
}
}
private class DummyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater,
#Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_dummy_layout,
container, false);
return v;
}
}
}
Here is the dialog.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Here is the error
03-06 19:43:38.487: E/AndroidRuntime(1167): FATAL EXCEPTION: main
03-06 19:43:38.487: E/AndroidRuntime(1167): Process: com.me.sandbox, PID: 1167
03-06 19:43:38.487: E/AndroidRuntime(1167): java.lang.IllegalArgumentException: No view found for id 0x7f05003d (com.mochimira.sandbox:id/pager) for fragment DummyFragment{b2d9f8c8 #0 id=0x7f05003d}
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:939)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-06 19:43:38.487: E/AndroidRuntime(1167): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.View.measure(View.java:16497)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.Choreographer.doFrame(Choreographer.java:544)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.os.Handler.handleCallback(Handler.java:733)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.os.Handler.dispatchMessage(Handler.java:95)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.os.Looper.loop(Looper.java:136)
03-06 19:43:38.487: E/AndroidRuntime(1167): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-06 19:43:38.487: E/AndroidRuntime(1167): at java.lang.reflect.Method.invokeNative(Native Method)
03-06 19:43:38.487: E/AndroidRuntime(1167): at java.lang.reflect.Method.invoke(Method.java:515)
03-06 19:43:38.487: E/AndroidRuntime(1167): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-06 19:43:38.487: E/AndroidRuntime(1167): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-06 19:43:38.487: E/AndroidRuntime(1167): at dalvik.system.NativeStart.main(Native Method

I have found a solution to the problem and have modified your classes so that this error no longer occurs.
The only major difference was that you should use a DialogFragment instead of a Dialog, that way you have access to call getChildFragmentManager() and receive the correct FragmentManager from the DialogFragment.
Even though you were using getChildFragmentManager() before, it was coming from MyFragment and the PagerDialog class was not a child fragment in MyFragment.
I have tested the code below, and it should be working fine now.
MyFragment
public class MyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_sandbox, container, false);
Button button = (Button) v.findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
DialogFragment newFragment = PagerDialog.newInstance();
newFragment.show(getChildFragmentManager(), "dialog");
}
});
return v;
}
}
PagerDialog
public class PagerDialog extends DialogFragment {
public static PagerDialog newInstance() {
return new PagerDialog();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.dialog_fragment, container, false);
ViewPager mViewPager = (ViewPager) v.findViewById(R.id.view_pager);
/* Use childFragmentManager here provided from the PagerDialog */
MyAdapter mAdapter = new MyAdapter(getChildFragmentManager());
mViewPager.setAdapter(mAdapter);
return v;
}
private class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
return new DummyFragment();
}
#Override
public int getCount() {
return 2;
}
}
}
DummyFragment
public class DummyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_dummy_layout, container, false);
return v;
}
}
fragment_sandbox.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test Fragment Dialog Pager"
android:textSize="24sp"
android:padding="20dp" />
</LinearLayout>
dialog_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fragment Dialog Title Text "
android:padding="10dp"
android:textColor="#333"
android:textSize="24sp"/>
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="200dp"/>
</LinearLayout>
fragment_dummy_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fragment Dummy Text"
android:textSize="24sp"
android:textColor="#ff0000"/>
</LinearLayout>

I found in Google a blog post, it says that viewpager doesn't work on Dialog.
It also says we should use DialogFragment instead.
Here is the link to that blog: http://www.intellicode.in/viewpager-inside-dialog/

getChildFragmentManager() is available since API 17 while you're using the v4 support library. Try using the support fragment manager instead:
PagerDialog dialog = new PagerDialog(getActivity(),
getActivity().getSupportFragmentManager());

The Dialog class is the base class for dialogs, but you should avoid instantiating Dialog directly. Instead, use one of the following subclasses:
AlertDialogA dialog that can show a title, up to three buttons, a list of selectable items, or a custom layout. And also DatePickerDialog or TimePickerDialog.
These classes define the style and structure for your dialog, but you should use a DialogFragment as a container for your dialog. The DialogFragment class provides all the controls you need to create your dialog and manage its appearance, instead of calling methods on the Dialog object.
For more detail please go through Dialog Design

The error sounds like it's looking for the id pager in the xml file for DummyFragment (fragment_dummy_layout.xml). I wonder if this is due to calling View v = inflater.inflate(R.layout.fragment_dummy_layout, container, false); in the same file as setContentView(R.layout.dialog);. Have you tried separating DummyFragment into it's own file?
You could also try
View v = getActivity().getLayoutInflater().inflate(R.layout.fragment_dummy_layout,
container, false);

Try using DialogFragment and pass getChildFragmentManager() to your FragmentPagerAdapter's constructor.
DialogFragment:
public static class MyDialogFragment extends DialogFragment {
private ViewPager viewPager;
MySectionPagerAdapter mAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.m_layout, container);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
mAdapter = new MySectionPagerAdapter(getChildFragmentManager());
viewPager.setAdapter(mAdapter);
return view;
}
}

so far, we can't figure out why there is an error, but I have a way to work around this, using this tip:
Tip: If you want a custom dialog, you can instead display an Activity as a dialog instead of using the Dialog APIs. Simply create an activity and set its theme to Theme.Holo.Dialog in the manifest element:
<activity android:theme="#android:style/Theme.Holo.Dialog"
Based on this tip, I don't make PagerDialog extend Dialog but from Fragment. And then put this Fragment inside an Activity , set the theme of this activity as above in AndroidManifest.xml.
The updated code for the PagerDialog is as followed.
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PagerDialog extends Fragment {
ViewPager mViewPager;
FragmentStatePagerAdapter mAdapter;
#Override
public View onCreateView(LayoutInflater inflater,
#Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.id.dialog, container, false);
mViewPager = (ViewPager) v.findViewById(R.id.pager);
mAdapter = new MyAdapter(getFragmentManager());
mViewPager.setAdapter(mAdapter);
return v;
}
private class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
return new DummyFragment();
}
#Override
public int getCount() {
return 2;
}
}
private class DummyFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater,
#Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_dummy_layout,
container, false);
return v;
}
}
}
If you have any better solutions or you can find out why the original code in my question does not work, please teach me. I am a newbie in Android programing and I am happy to learn from you all.
Cheers.

I think you used
Dialog dialog = new Dialog(context);
Instends this.
1st Step: Used DialogFragment
public class MyCustomDialog extends DialogFragment {
Button mButton;
EditText mEditText;
List<MasterPageModel> listdata;
int position;
ViewPager viewpager;
public MyCustomDialog(List<MasterPageModel> listdata, int position) {
this.listdata = listdata;
this.position = position;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View dialog = inflater.inflate(R.layout.dailoglayout, container);
final Dialog dailog = getDialog();
dailog.getWindow().setLayout(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
dailog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
dailog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
ImageView closebtn = (ImageView) dialog.findViewById(R.id.closeimgeview);
closebtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dailog.dismiss();
}
});
viewpager = (ViewPager) dialog.findViewById(R.id.dailog_viewpager);
**viewpager.setAdapter(new PagerAdapter(getChildFragmentManager(), listdata));** //This Line is Very important
viewpager.setCurrentItem(position);
return dialog;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(DialogFragment.STYLE_NORMAL, android.R.style.Theme_Black_NoTitleBar_Fullscreen); //For Full Screen of DailogBox
}
}
2nd Step :set The FragmentViewPager
public class PagerAdapter extends FragmentPagerAdapter {
private final List<MasterPageModel> pages;
public PagerAdapter(FragmentManager fm, List<MasterPageModel> pages) {
super(fm);
this.pages = pages;
}
#Override
public Fragment getItem(int position) {
return new ViewPagerFragment(pages.get(position));
}
#Override
public int getCount() {
return pages.size();
}
}
3rd Step : Fragment View For ViewPager:
public class ViewPagerFragment extends Fragment {
MasterPageModel masteDetailModel;
public ViewPagerFragment(MasterPageModel questionItem) {
this.masteDetailModel = questionItem;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.pagerlayout, container, false);
ImageView image = (ImageView) v.findViewById(R.id.pager_imageview);
Log.i("Image", "=>" + masteDetailModel.imagelarge);
Picasso.with(getActivity()).load(masteDetailModel.imagethumb).error(R.drawable.img).into(image);
return v;
}
4th How to Use this dialogfragment:
MyCustomDialog fragment1 = new MyCustomDialog(listdata, position);
EditionDetailActivity act = (EditionDetailActivity) context;
FragmentManager fm = act.getSupportFragmentManager();
fragment1.show(fm, "");

Unable to load fragment into activity

I am trying to add the abmob ads to an activity in my android app but the the fragment will not load. When the application load it crash and say's Unable to start activity ComponentInfo{catchmedia.jamaica.dictionary/catchmedia.jamaica.dictionary.HomeActivity}: android.view.InflateException: Binary XML file line #15: Error inflating class fragment. what is that i have done wrong?
stacktrace
01-06 22:28:02.335 1356-1356/catchmedia.jamaica.dictionary E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: catchmedia.jamaica.dictionary, PID: 1356
java.lang.RuntimeException: Unable to start activity ComponentInfo{catchmedia.jamaica.dictionary/catchmedia.jamaica.dictionary.HomeActivity}: android.view.InflateException: Binary XML file line #15: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #15: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
at android.app.Activity.setContentView(Activity.java:1929)
at catchmedia.jamaica.dictionary.HomeActivity.onCreate(HomeActivity.java:39)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f030004
at android.content.res.Resources.getValue(Resources.java:1123)
at android.content.res.Resources.loadXmlResourceParser(Resources.java:2309)
at android.content.res.Resources.getLayout(Resources.java:939)
at android.view.LayoutInflater.inflate(LayoutInflater.java:395)
at catchmedia.jamaica.dictionary.HomeActivity$AdFragment.onCreateView(HomeActivity.java:156)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:920)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1206)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2159)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:297)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
            at android.app.Activity.setContentView(Activity.java:1929)
            at catchmedia.jamaica.dictionary.HomeActivity.onCreate(HomeActivity.java:39)
            at android.app.Activity.performCreate(Activity.java:5231)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
01-06 22:28:04.183 1356-1356/catchmedia.jamaica.dictionary I/Process﹕ Sending signal. PID: 1356 SIG: 9
AdFragment
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--ads:adUnitId sets the ad unit ID, which is defined in values/strings.xml -->
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
ads:adSize="BANNER"
ads:adUnitId="#string/banner_ad_unit_id" />
</RelativeLayout>
Xml Code
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>
<fragment
android:id="#+id/adFragment"
android:name="catchmedia.jamaica.dictionary.HomeActivity$AdFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
Class
package catchmedia.jamaica.dictionary;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import java.util.List;
import catchmedia.jamaica.dictionary.adapter.TabsPagerAdapter;
import database.DatabaseHandler;
import database.DatabaseInfo;
import database.Word;
public class HomeActivity extends FragmentActivity implements
ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter tabsPagerAdapter;
private ActionBar actionBar;
DatabaseHandler db = new DatabaseHandler(this);
private String[] tabsTitles = {"Lesson", "Word"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
initializeDatabase();
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
tabsPagerAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(tabsPagerAdapter);
actionBar.setHomeButtonEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabsTitles) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
public void initializeDatabase() {
List<Word> words = db.getAllWords();
if (words.size() == 0) {
DatabaseInfo info = new DatabaseInfo(db);
info.insertWords();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
return super.onCreateOptionsMenu(menu);
}
#Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// on tab selected
// show respected fragment view
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
default:
return super.onOptionsItemSelected(item);
}
}
public static class AdFragment extends Fragment {
private AdView mAdView;
public AdFragment() {
}
#Override
public void onActivityCreated(Bundle bundle) {
super.onActivityCreated(bundle);
mAdView = (AdView) getView().findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.build();
mAdView.loadAd(adRequest);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_ad, container, false);
}
/** Called when leaving the activity */
#Override
public void onPause() {
if (mAdView != null) {
mAdView.pause();
}
super.onPause();
}
/** Called when returning to the activity */
#Override
public void onResume() {
super.onResume();
if (mAdView != null) {
mAdView.resume();
}
}
/** Called before the activity is destroyed */
#Override
public void onDestroy() {
if (mAdView != null) {
mAdView.destroy();
}
super.onDestroy();
}
}
}

In your HomeActivity class, you've imported android.support.v4.app.Fragment, android.support.v4.app.FragmentActivity, etc. There is a conflict here.
In your XML, you're using <fragment>. You need to either change your imports to android.app.Fragment, or change XML to:
<android.support.v4.app.fragment
android:id="#+id/adFragment"
android:name="catchmedia.jamaica.dictionary.HomeActivity$AdFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
If you're using fragments, and want to target devices before API 11, you should be using use android.support.v4.app.Fragment. However, if you're only targeting devices running API 11 or above, you can use android.app.Fragment.
Otherwise, there is a conflict between you using Fragment and Fragment from the Android support library.

You should change fragment to android.support.v4.Fragment in your xml file as your AdFragment extends from android.support.v4.Fragment.

NullPointerExceptions when adding TextViews to a layout

When I add a TextView to a LinearLayout, I'm generating NullPointerExceptions. I'm calling this...
public void loadPlayers() {
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
TextView tv = new TextView(this);
for (int i = 0; i < Game.getPlayers().length; i++) {
tv.setText(String.valueOf(Game.getPlayers()[i]));
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setBackgroundColor(0xD0D0D0);
System.out.println("Got here!");
lv.addView(tv);
}
}
At the end of onCreate, and I'm getting "Got here!" printed on my console. The error is coming from
lv.addView(tv);
But I don't see why that is a problem. Is the layout not loaded yet? If so, how do I fix that? Below is the complete activity, xml, and logs.
MainActivity.java:
package com.example.lineupcreator;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/* My Methods */
/**
* Adds a player, gets input from button
* #return
*/
public void addPlayer(View view) {
EditText editText = (EditText) findViewById(R.id.edit_message);
String name = editText.getText().toString();
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
TextView tv = new TextView(this);
tv.setText(String.valueOf(name));
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setBackgroundColor(0xD0D0D0);
lv.addView(tv);// not InformationActivity.tv just write tv
Game.newPlayer(name);
}
/**
* Loads all of the players
*/
public void loadPlayers() {
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
TextView tv = new TextView(this);
for (int i = 0; i < Game.getPlayers().length; i++) {
tv.setText(String.valueOf(Game.getPlayers()[i]));
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setBackgroundColor(0xD0D0D0);
System.out.println("Got here!");
lv.addView(tv);
}
}
/* Prebuilt Methods */
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {#link #restoreActionBar()}.
*/
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
/* My Code */
Game.init();
this.loadPlayers();
}
#Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
fragment_main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.lineupcreator.MainActivity$PlaceholderFragment" >
<EditText android:id="#+id/edit_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/button"
android:hint="#string/player_name" />
<Button
android:id="#+id/button"
android:layout_width="64dp"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/edit_message"
android:layout_alignParentRight="true"
android:onClick="addPlayer"
android:text="#string/add" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/edit_message" >
<LinearLayout
android:id="#+id/player_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/darker_gray"
android:orientation="vertical" />
</ScrollView>
</RelativeLayout>
Logs:
07-24 17:30:48.274: D/ActivityThread(22173): handleBindApplication:com.example.lineupcreator
07-24 17:30:48.274: D/ActivityThread(22173): setTargetHeapUtilization:0.75
07-24 17:30:48.274: D/ActivityThread(22173): setTargetHeapMinFree:2097152
07-24 17:30:48.548: I/System.out(22173): Got here!
07-24 17:30:48.548: D/AndroidRuntime(22173): Shutting down VM
07-24 17:30:48.548: W/dalvikvm(22173): threadid=1: thread exiting with uncaught exception (group=0x418f1ce0)
07-24 17:30:48.555: E/AndroidRuntime(22173): FATAL EXCEPTION: main
07-24 17:30:48.555: E/AndroidRuntime(22173): Process: com.example.lineupcreator, PID: 22173
07-24 17:30:48.555: E/AndroidRuntime(22173): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lineupcreator/com.example.lineupcreator.MainActivity}: java.lang.NullPointerException
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2215)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2265)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread.access$800(ActivityThread.java:145)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.os.Handler.dispatchMessage(Handler.java:102)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.os.Looper.loop(Looper.java:136)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread.main(ActivityThread.java:5144)
07-24 17:30:48.555: E/AndroidRuntime(22173): at java.lang.reflect.Method.invokeNative(Native Method)
07-24 17:30:48.555: E/AndroidRuntime(22173): at java.lang.reflect.Method.invoke(Method.java:515)
07-24 17:30:48.555: E/AndroidRuntime(22173): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
07-24 17:30:48.555: E/AndroidRuntime(22173): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
07-24 17:30:48.555: E/AndroidRuntime(22173): at dalvik.system.NativeStart.main(Native Method)
07-24 17:30:48.555: E/AndroidRuntime(22173): Caused by: java.lang.NullPointerException
07-24 17:30:48.555: E/AndroidRuntime(22173): at com.example.lineupcreator.MainActivity.loadPlayers(MainActivity.java:64)
07-24 17:30:48.555: E/AndroidRuntime(22173): at com.example.lineupcreator.MainActivity.onCreate(MainActivity.java:96)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.Activity.performCreate(Activity.java:5231)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-24 17:30:48.555: E/AndroidRuntime(22173): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
07-24 17:30:48.555: E/AndroidRuntime(22173): ... 11 more
07-24 17:35:48.735: I/Process(22173): Sending signal. PID: 22173 SIG: 9
EDIT:
It seemed to me that quaternion was on the right path, but his solution didn't work. I also tried to creating an array of TextViews, as seen below, but that also didn't work.
public void loadPlayers() {
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
TextView[] tv = new TextView[Game.getPlayers().length];
for (int i = 0; i < Game.getPlayers().length; i++) {
tv[i] = new TextView(this);
tv[i].setText(String.valueOf(Game.getPlayers()[i]));
tv[i].setPadding(8, 8, 8, 8);
tv[i].setTextSize(20);
tv[i].setBackgroundColor(0xD0D0D0);
System.out.println("Got here!");
lv.addView(tv[i]);
}
}
Update:
I tried calling loadPlayers from addPlayer and not onCreate, and it works perfectly. The only problem is created when loadPlayers is called from onCreate

Caused by: java.lang.NullPointerException
at com.example.lineupcreator.MainActivity.loadPlayers(MainActivity.java:64)
The reason why you're getting NullPointerException is because you're trying to get a LinearLayout which is inflated in Fragment, from the Activity, specifically these lines:
public void loadPlayers() {
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
// R.id.player_list is not inside activity_main.xml
// lv is null
...
lv.addView(tv[i]); // NullPointerException
}
}
One way to solve this is to move all the logic inside the Fragment.
Add onActivityCreated(Bundle savedInstanceState) inside the PlaceholderFragment and move both lines from onCreate() to there. This is to ensure that the code will be called after the activity is already set-up.
#Override
public void onActivityCreated (Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
/* My Code */
Game.init();
this.loadPlayers();
}
Then move loadPlayers() inside the PlaceholderFragment. However, there is no findViewById() inside a Fragment. Instead, you have to initialize the views inside onCreateView(). Don't forget to declare the variables inside the Fragment.
LinearLayout lv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
lv = (LinearLayout) rootView.findViewById(R.id.player_list);
return rootView;
}
Lastly, Fragment use Context from its Activity. While you can use this in Activity to refer to its Context, in Fragment you cannot. Instead, use getActivity().
public void loadPlayers() {
// LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
TextView tv;
for (int i = 0; i < Game.getPlayers().length; i++) {
tv = new TextView(getActivity());
tv.setText(String.valueOf(Game.getPlayers()[i].getName()));
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setBackgroundColor(0xD0D0D0);
lv.addView(tv);
}
}

Ok, the Error is that you are trying inflate a layout component from the main activity, but your are inflating a Fragment, so, your main layout is not showing in your screen, is the fragment layout that is the top. You need move
<LinearLayout
android:id="#+id/player_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/darker_gray"
android:orientation="vertical" />
to Fragment Layout.
If this donsn't work just tell me.

I don't think you can add the same view to a parent multiple times. You will need to move you instantiation of the new TextView into the for loop.
Your loadPlayers function should look like this:
public void loadPlayers() {
LinearLayout lv = (LinearLayout) findViewById(R.id.player_list);
for (int i = 0; i < Game.getPlayers().length; i++) {
TextView tv = new TextView(this);
tv.setText(String.valueOf(Game.getPlayers()[i]));
tv.setPadding(8, 8, 8, 8);
tv.setTextSize(20);
tv.setBackgroundColor(0xD0D0D0);
System.out.println("Got here!");
lv.addView(tv);
}
}
Hope this helps, if not you may have a bigger issue at hand =(

Android app crashing with OnClickListener in fragment

I'm having a problem building my first App. I'm using Navigation drawer to switch between fragments. But when i choose OrderFragment from Navigation drawer, app crashes.
OrderFragment has only one button showing a toast when clicked, but the app crashes before the OrderFragment loads.
The code is:
MainActivity.java
package com.example.testcocogeek;
import android.app.Activity;
import android.app.Fragment;
import android.app.SearchManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
private String[] mListOptions;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private ActionBarDrawerToggle mDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
mListOptions = getResources().getStringArray(R.array.list_options);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// Set adapter for the list view
mDrawerList.setAdapter (new ArrayAdapter<String> (this,
R.layout.drawer_list_item, mListOptions));
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// Set the list click listener
mDrawerList.setOnItemClickListener (new DrawerItemClickListener());
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
/* Called whenever we call invalidateOptionsMenu() */
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch(item.getItemId()) {
case R.id.action_websearch:
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, "Cocogeek");
// catch event that there's no activity to handle intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* The click listener for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
// This method selects correct fragment.
private void selectItem(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
Bundle args = new Bundle();
switch (position) {
case 0:
fragment = new CocogeekFragment();
break;
case 1:
fragment = new OrderFragment();
break;
case 2:
fragment = new LocatorFragment();
break;
case 3:
fragment = new ContactFragment();
break;
default:
break;
}
fragment.setArguments(args);
android.app.FragmentManager frgManager = getFragmentManager();
frgManager.beginTransaction().replace(R.id.content_frame, fragment)
.commit();
mDrawerList.setItemChecked(position, true);
setTitle(mListOptions[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
OrderFragment.java
package com.example.testcocogeek;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class OrderFragment extends Fragment implements OnClickListener {
public OrderFragment() {
// Empty constructor required for fragment subclasses
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mView = (View) inflater.inflate(R.layout.order_fragment, container, false);
// Initialize UI views.
final Button send = (Button) getActivity().findViewById(R.id.send);
//Initialize OnClick listener.
send.setOnClickListener(this);
return mView;
}
#Override
public void onClick(View v) {
Toast.makeText(getActivity(), "Clicked" ,Toast.LENGTH_LONG).show();
}
}
activity_main.xml
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFF5EE"
>
<!-- The main content view -->
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</FrameLayout>
<!-- The navigation drawer -->
<ListView android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"
android:background="#858585"/>
</android.support.v4.widget.DrawerLayout>
order_fragment.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/send"
/>
</LinearLayout>
logCat:
07-08 12:28:09.332: D/dalvikvm(30471): GC_FOR_ALLOC freed 165K, 2% free 16940K/17136K, paused 15ms, total 15ms
07-08 12:28:09.362: I/dalvikvm-heap(30471): Grow heap (frag case) to 35.315MB for 19655120-byte allocation
07-08 12:28:09.372: D/dalvikvm(30471): GC_FOR_ALLOC freed 2K, 1% free 36132K/36332K, paused 11ms, total 11ms
07-08 12:28:09.522: I/Adreno-EGL(30471): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
07-08 12:28:09.542: D/OpenGLRenderer(30471): Enabling debug mode 0
07-08 12:28:11.852: D/AndroidRuntime(30471): Shutting down VM
07-08 12:28:11.852: W/dalvikvm(30471): threadid=1: thread exiting with uncaught exception (group=0x41625ba8)
07-08 12:28:11.862: E/AndroidRuntime(30471): FATAL EXCEPTION: main
07-08 12:28:11.862: E/AndroidRuntime(30471): Process: com.example.testcocogeek, PID: 30471
07-08 12:28:11.862: E/AndroidRuntime(30471): java.lang.NullPointerException
07-08 12:28:11.862: E/AndroidRuntime(30471): at com.example.testcocogeek.OrderFragment.onCreateView(OrderFragment.java:29)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.Fragment.performCreateView(Fragment.java:1700)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.BackStackRecord.run(BackStackRecord.java:684)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.os.Handler.handleCallback(Handler.java:733)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.os.Handler.dispatchMessage(Handler.java:95)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.os.Looper.loop(Looper.java:136)
07-08 12:28:11.862: E/AndroidRuntime(30471): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-08 12:28:11.862: E/AndroidRuntime(30471): at java.lang.reflect.Method.invokeNative(Native Method)
07-08 12:28:11.862: E/AndroidRuntime(30471): at java.lang.reflect.Method.invoke(Method.java:515)
07-08 12:28:11.862: E/AndroidRuntime(30471): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-08 12:28:11.862: E/AndroidRuntime(30471): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-08 12:28:11.862: E/AndroidRuntime(30471): at dalvik.system.NativeStart.main(Native Method)
07-08 12:28:13.332: I/Process(30471): Sending signal. PID: 30471 SIG: 9

At first sight you should replace:
final Button send = (Button) getActivity().findViewById(R.id.send);
with:
final Button send = (Button) mView.findViewById(R.id.send);
R.id.send id is contained in the Fragment view mView.