Android tab clicked

Android tab clicked - java

I'm trying to apply TABs to my Android layout. How could I identify which tab was clicked?
I have an android tab layout made this way:
package com.truiton.designsupporttabs;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TabFragment2 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab_fragment_2, container, false);
}
}
With the layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Tab 2"
android:textAppearance="?android:attr/textAppearanceLarge"/>
</RelativeLayout>
I do not know how to identify that a tab like the above example was clicked.

Having as a principle that your code was based on the Truiton tutorial, just follow how they identify the clicks.
package com.truiton.designsupporttabs;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PagerAdapter(FragmentManager fm, int NumOfTabs) {
super(fm);
this.mNumOfTabs = NumOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
TabFragment1 tab1 = new TabFragment1();
return tab1;
case 1:
TabFragment2 tab2 = new TabFragment2();
return tab2;
case 2:
TabFragment3 tab3 = new TabFragment3();
return tab3;
default:
return null;
}
}
#Override
public int getCount() {
return mNumOfTabs;
}
}
This should work!

Related

Tab Not Changing on click of tab layout items

Fragments(tabs) are not changing on click of tab layout(tabs button)
I have tried the following code
MainActivity.java
package com.kunal.flightstatus;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import android.net.Uri;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabLayout tabLayout = findViewById(R.id.tablayout);
tabLayout.addTab(tabLayout.newTab().setText("Home"));
tabLayout.addTab(tabLayout.newTab().setText("Favourite"));
tabLayout.addTab(tabLayout.newTab().setText("Search"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = findViewById(R.id.viewpager);
PageAdapter adapter = new PageAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
}
}
PagerAdapter.java
package com.kunal.flightstatus;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
public class PageAdapter extends FragmentPagerAdapter {
public PageAdapter(#NonNull FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Fragment getItem(int position) {
switch (position){
case 0 :
Tab1 tab1 = new Tab1();
position +=1;
Bundle bundle = new Bundle();
bundle.putString("message","fragment :"+position);
tab1.setArguments(bundle);
return tab1;
case 1 :
Tab2 tab2 = new Tab2();
position +=1;
Bundle bundl = new Bundle();
bundl.putString("message","fragment :"+position);
tab2.setArguments(bundl);
return tab2;
case 2 :
Tab3 tab3 = new Tab3();
position +=1;
Bundle bundlee = new Bundle();
bundlee.putString("message","fragment :"+position);
tab3.setArguments(bundlee);
return tab3;
default:
return null;
}
}
#Override
public int getCount() {
return 3;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tablayout"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:id="#+id/viewpager">
</androidx.viewpager.widget.ViewPager>
</LinearLayout>
Tabs(fragments) Should change on click of tab layout item

ViewPager and TabLayout need to be linked for tab switching to work.
tabLayout.setupWithViewPager(viewPager);
should do the trick.
That way TabLayout will be connected to the ViewPager and will get filled automatically. Implement CharSequence getPageTitle (int position) in your FragmentPagerAdapter to fill in the titles instead of calling tabLayout.addTab() manually:
#NonNull
private List<String> titles = Arrays.asList("Home", "Favourite", "Search");
#Override
public CharSequence getPageTitle (int position) {
return titles.get(position);
}
The whole setup will look like that:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tablayout"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:tabGravity="fill" />
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:id="#+id/viewpager" />
</LinearLayout>
activity:
package com.kunal.flightstatus;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ViewPager viewPager = findViewById(R.id.viewpager);
PageAdapter adapter = new PageAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
TabLayout tabLayout = findViewById(R.id.tablayout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setupWithViewPager(viewPager);
}
}
PagerAdapter:
package com.kunal.flightstatus;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import java.util.Arrays;
import java.util.List;
public class PageAdapter extends FragmentPagerAdapter {
#NonNull
private List<String> titles = Arrays.asList("Home", "Favourite", "Search");
public PageAdapter(#NonNull FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
#Override
public CharSequence getPageTitle (int position) {
return titles.get(position);
}
#NonNull
#Override
public Fragment getItem(int position) {
switch (position){
case 0 :
Tab1 tab1 = new Tab1();
position +=1;
Bundle bundle = new Bundle();
bundle.putString("message","fragment :"+position);
tab1.setArguments(bundle);
return tab1;
case 1 :
Tab2 tab2 = new Tab2();
position +=1;
Bundle bundl = new Bundle();
bundl.putString("message","fragment :"+position);
tab2.setArguments(bundl);
return tab2;
case 2 :
Tab3 tab3 = new Tab3();
position +=1;
Bundle bundlee = new Bundle();
bundlee.putString("message","fragment :"+position);
tab3.setArguments(bundlee);
return tab3;
default:
throw new IllegalStateException();
}
}
#Override
public int getCount() {
return 3;
}
}

Nested ViewPager not refreshing

Problem Statement:
I have an activity on which I have used a view pager and inflated two fragments inside it.
The second fragment inside the view pager must also contain a view pager which has another fragment inside it(If you're wondering why this is a view pager if only a single fragment is required, because that is a configurable component and more fragments might be required inside it).
First Fragment
Second Fragment and the sub fragment inside it
Now, when we click a button I have to refresh the first and second fragments as well as the sub fragment( in the ViewPager) inside the second fragment.
The issue is that the first and the second fragments are getting updated but the sub fragment that is inside the view pager in the second fragment is not getting refreshed.
This happens after the click of the button:
First Fragment refreshed
Second fragment refreshed but the sub fragment did not
Tried solutions:
We tried to debug the code, tried clearing the adapters and the lists. Nothing worked.
Any pointers or suggestions welcome !
Code :
MainActivity.java
package com.example.admin.myapplication;
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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private GuestListPagerAdapter adapter;
private ViewPager viewPager;
private Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = findViewById(R.id.view_pager);
button = findViewById(R.id.button);
setUpViewPager();
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
adapter.clearFragmentList();
adapter.addFragment(FirstFragment.newInstance("55"));
adapter.addFragment(SecondFragment.newInstance("88"));
adapter.notifyDataSetChanged();
}
});
}
private void setUpViewPager() {
if (null == adapter)
adapter = new GuestListPagerAdapter(getSupportFragmentManager());
adapter.addFragment(FirstFragment.newInstance("1"));
adapter.addFragment(SecondFragment.newInstance("2"));
viewPager.setAdapter(adapter);
}
public class GuestListPagerAdapter extends FragmentStatePagerAdapter {
private List<Fragment> mFragments = new ArrayList<>();
GuestListPagerAdapter(FragmentManager fm) {
super(fm);
}
void addFragment(Fragment fragment) {
mFragments.add(fragment);
}
void clearFragmentList(){
mFragments.clear();
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="8"/>
<Button
android:text="Refresh View Pager"
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_gravity="center"/>
</LinearLayout>
SecondFragment.java
package com.example.admin.myapplication;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
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.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class SecondFragment extends Fragment {
private static final String TAG = SecondFragment.class.getSimpleName();
private static final String ARG_PARAM1 = "param1";
private String mParam1;
public SecondFragment() {
// Required empty public constructor
}
public static SecondFragment newInstance(String param1) {
SecondFragment fragment = new SecondFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
fragment.setArguments(args);
Log.d(TAG, "newInstance: 2F");
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
}
Log.d(TAG, "onCreate: 2F");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_second, container, false);
TextView tv = (TextView) view.findViewById(R.id.tv2);
tv.setText(mParam1);
ViewPager pager = (ViewPager) view.findViewById(R.id.sub_view_pager);
SubListPagerAdapter adapter = new SubListPagerAdapter(getChildFragmentManager());
adapter.clearFragmentList();
adapter.addFragment(SubFragment.newInstance(mParam1));
pager.setAdapter(adapter);
Log.d(TAG, "onCreateView: 2F");
return view;
}
public class SubListPagerAdapter extends FragmentStatePagerAdapter {
private List<Fragment> mFragments = new ArrayList<>();
SubListPagerAdapter(FragmentManager fm) {
super(fm);
}
void addFragment(Fragment fragment) {
mFragments.add(fragment);
}
void clearFragmentList(){
mFragments.clear();
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
}
fragment_second.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
android:weightSum="4"
tools:context=".SecondFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="#+id/tv2"
android:textSize="60sp"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:text="#string/hello_blank_fragment" />
<android.support.v4.view.ViewPager
android:background="#color/colorAccent"
android:id="#+id/sub_view_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"/>
</LinearLayout>
SubFragment.java
package com.example.admin.myapplication;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class SubFragment extends Fragment {
private static final String TAG = SubFragment.class.getSimpleName();
private static final String ARG_PARAM1 = "param1";
private String mParam1;
public SubFragment() {
// Required empty public constructor
}
public static SubFragment newInstance(String param1) {
SubFragment fragment = new SubFragment();
Bundle args = new Bundle();
if(fragment.getArguments()!=null)
fragment.getArguments().clear();
args.putString(ARG_PARAM1, param1);
fragment.setArguments(args);
Log.d(TAG, "newInstance: sub");
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate: sub");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_sub, container, false);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
}
TextView tv = (TextView) view.findViewById(R.id.sub_tv);
tv.setText(mParam1);
Log.d(TAG, "onCreateView: sub");
return view;
}
}
fragment_sub.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".SubFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="#+id/sub_tv"
android:textSize="60dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_blank_fragment" />
</LinearLayout>
FirstFragment.java
package com.example.admin.myapplication;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class FirstFragment extends Fragment {
private static final String TAG = FirstFragment.class.getSimpleName();
private static final String ARG_PARAM1 = "param1";
private String mParam1;
public FirstFragment() {
// Required empty public constructor
}
public static FirstFragment newInstance(String param1) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
fragment.setArguments(args);
Log.d(TAG, "newInstance: 1F");
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
}
Log.d(TAG, "onCreate: 1F");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_first, container, false);
TextView tv = (TextView) view.findViewById(R.id.tv);
tv.setText(mParam1);
Log.d(TAG, "onCreateView: 1F");
return view;
}
}
fragment_first.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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=".FirstFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="#+id/tv"
android:textSize="60sp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
</FrameLayout>

Why can't I see any changes in my "Place" tab

I want each tab to to show something different. To start things off, I want to make changes to the Place tab. The problem is, none of the changes are being reflected in the Android Simulator.
Image of what I'm referring to
In this case, I want the text something to show up, but it's not. What am I doing wrong? I've also included code that might be relevant to this issue.
Here's MainActivity.java:
import android.net.Uri;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
public class MainActivity extends AppCompatActivity implements Place.OnFragmentInteractionListener, Profile.OnFragmentInteractionListener, Take.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabLayout tabLayout = (TabLayout)findViewById(R.id.tabLayout);
tabLayout.addTab(tabLayout.newTab().setText("Place"));
tabLayout.addTab(tabLayout.newTab().setText("Take"));
tabLayout.addTab(tabLayout.newTab().setText("Profile"));
final ViewPager viewPager = (ViewPager)findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public void onFragmentInteraction(Uri uri) {
}
}
Here's fragment_place.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"
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Place"
android:layout_centerInParent="true"
android:textSize="30dp"
android:id="#+id/textView" />
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="41dp"
android:layout_marginStart="41dp"
android:layout_marginTop="80dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Something" />
</RelativeLayout>
Here's PagerAdapter.java:
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNoOfTabs;
public PagerAdapter(FragmentManager fm, int NumberOfTabs) {
super(fm);
this.mNoOfTabs = NumberOfTabs; // set global number of tabs to local number of tabs
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0:
Place place = new Place();
return place;
case 1:
Profile profile = new Profile();
return profile;
case 2:
Take take = new Take();
return take;
default:
return null;
}
}
#Override
public int getCount() {
return 0;
}
}

I don't see in your code where you provide the layout xml to the fragment

Change the lines to given code.
#Override
public int getCount() {
return mNoOfTabs ;
}
Also make sure you inflate the layout belong to Place (Fragment) onViewCreated() method

Viewpager in Dialog?

I'm trying to have a dialog where you can click a "next" button to swipe right to the next screen. I am doing that with a ViewPager and adapter:
final Dialog dialog = new Dialog(this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.voicedialog);
dialog.setCanceledOnTouchOutside(false);
MyPageAdapter adapter = new MyPageAdapter();
ViewPager pager = (ViewPager) findViewById(R.id.viewpager);
pager.setAdapter(adapter);
However, I get a NullPointerException saying that pager is null. Why is this happening? Here is the Page Adapter class:
public class MyPageAdapter extends PagerAdapter {
public Object instantiateItem(ViewGroup collection, int position) {
int resId = 0;
switch (position) {
case 0:
resId = R.id.voice1;
break;
case 1:
resId = R.id.voice2;
break;
}
return collection.findViewById(resId);
}
#Override
public int getCount() {
return 2;
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
}
Here's my layout for the DIALOG:
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Let me know on how to avoid this situation.
PS: Each of the layouts that should be in the view pager look like this, just diff. text:
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/voice2"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:text="Slide 1!"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView2"
android:layout_gravity="center"
android:textSize="50sp" />
</RelativeLayout>

Without Using Enum Class
You should call findViewById on dialog. so for that you have to add dialog before findViewById..
Like this,
ViewPager pager = (ViewPager) dialog.findViewById(R.id.viewpager);
After solving your null pointer exception the other problem's solution here, if you wont use enum class you can use below code...
MainActivity.java
package demo.com.pager;
import android.app.Dialog;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn= (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final Dialog dialog = new Dialog(MainActivity.this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.voicedialog);
dialog.setCanceledOnTouchOutside(false);
MyPageAdapter adapter = new MyPageAdapter(MainActivity.this);
ViewPager pager = (ViewPager) dialog.findViewById(R.id.viewpager);
pager.setAdapter(adapter);
dialog.show();
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="demo.com.pager.MainActivity">
<Button
android:id="#+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
MyPageAdapter.java
package demo.com.pager;
import android.app.FragmentManager;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by rucha on 26/12/16.
*/
public class MyPageAdapter extends PagerAdapter {
Context mContext;
int resId = 0;
public MyPageAdapter(Context context) {
mContext = context;
}
public Object instantiateItem(ViewGroup collection, int position) {
/* int resId = 0;
switch (position) {
case 0:
resId = R.id.voice1;
break;
case 1:
resId = R.id.voice2;
break;
}
return collection.findViewById(resId);*/
LayoutInflater inflater = LayoutInflater.from(mContext);
switch (position) {
case 0:
resId = R.layout.fragment_blue;
break;
case 1:
resId = R.layout.fragment_pink;
break;
}
ViewGroup layout = (ViewGroup) inflater.inflate(resId, collection, false);
collection.addView(layout);
return layout;
}
#Override
public int getCount() {
return 2;
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
}
FragmentBlue.java
package demo.com.pager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import android.support.v4.app.Fragment;
public class FragmentBlue extends Fragment {
private static final String TAG = FragmentBlue.class.getSimpleName();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_blue, container, false);
return view;
}
}
fragment_blue.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"
android:background="#4ECDC4">
</RelativeLayout>
voicedialog.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Please check and reply.

Using Enum Class
Try this code, This is working if any doubt ask again. Happy to help.
MainActivity.java
package demo.com.dialogdemo;
import android.app.Dialog; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.Window; import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupUIComponents();
setupListeners();
}
private void setupUIComponents() {
button = (Button) findViewById(R.id.button);
}
private void setupListeners() {
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialogItemDetails = new Dialog(MainActivity.this);
dialogItemDetails.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialogItemDetails.setContentView(R.layout.dialoglayout);
dialogItemDetails.getWindow().setBackgroundDrawable(
new ColorDrawable(Color.TRANSPARENT));
ViewPager viewPager = (ViewPager) dialogItemDetails.findViewById(R.id.viewPagerItemImages);
viewPager.setAdapter(new CustomPagerAdapter(MainActivity.this));
dialogItemDetails.show();
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="dialog" />
</RelativeLayout>
ModelObject1.java
public enum ModelObject1 {
RED(R.string.red, R.layout.fragment_one),
BLUE(R.string.blue, R.layout.fragment_two);
private int mTitleResId;
private int mLayoutResId;
ModelObject1(int titleResId, int layoutResId) {
mTitleResId = titleResId;
mLayoutResId = layoutResId;
}
public int getTitleResId() {
return mTitleResId;
}
public int getLayoutResId() {
return mLayoutResId;
}
}
CustomPagerAdapter.java
package demo.com.dialogdemo;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by rucha on 26/12/16.
*/
public class CustomPagerAdapter extends PagerAdapter {
private Context mContext;
public CustomPagerAdapter(Context context) {
mContext = context;
}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
ModelObject1 modelObject = ModelObject1.values()[position];
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(modelObject.getLayoutResId(), collection, false);
collection.addView(layout);
return layout;
}
#Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((View) view);
}
#Override
public int getCount() {
return ModelObject1.values().length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public CharSequence getPageTitle(int position) {
ModelObject1 customPagerEnum = ModelObject1.values()[position];
return mContext.getString(customPagerEnum.getTitleResId());
}
}
dailoglayout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/txtHeaderTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:text="ITEM IMAGES"
android:textStyle="bold" />
<android.support.v4.view.ViewPager
android:id="#+id/viewPagerItemImages"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white" />
</RelativeLayout>
fragmentone.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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one"/>
</LinearLayout>

Changing fragment on clicking on Imageview

I create a project with the NavigationDrawerFragment, and I set the fragments for the menu. Switching between menus fragments are working. But now I create an imageview on one of the fragments. and I want that when you click on the imageview it changes fragment just like the menu.
MainActivity.java
package com.****.****;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
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.TextView;
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* 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));
}
#Override
public void onNavigationDrawerItemSelected(int position) {
Fragment objFragment = null;
switch (position) {
case 0:
objFragment = new news_Fragment();
break;
case 1:
objFragment = new heroes_Fragment();
break;
case 2:
objFragment = new game_Fragment();
break;
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, objFragment)
.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.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
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));
}
}
}
heroes_Fragment.java
package com.****.****;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Calvin on 27/12/2014.
*/
public class heroes_Fragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.trac_layout, container, false);
}
public View trac(View view, LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.trac_layout, container, false);
}
}
heroes_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#drawable/header_bg">
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignWithParentIfMissing="false"
android:id="#+id/tableLayout"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/icontrac"
android:src="#drawable/icon_portrait_trac"
android:layout_column="0"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:clickable="true"
android:onClick="trac"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/iconreap"
android:src="#drawable/icon_portrait_reap"
android:layout_column="1"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/iconwid"
android:src="#drawable/icon_portrait_wid"
android:layout_column="2"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp" />
</TableRow>
</TableLayout>
</RelativeLayout>
trac_Fragment.java
package com.****.****;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Calvin on 27/12/2014.
*/
public class trac_Fragment extends Fragment {
}
}
I want that when you click on the imageview (trac) it changes fragment. As if we change activity.
And sorry for my English.
I tried to use trac() methode but the apps crash

You did set in layout android:onClick="trac", but you never used trac() method.
You should declare trac() {...} under appropriate class (where you implement that heroes_layout.xml), and resolve call of new activity there (using Intents)

Thanks Gudin for your help. You really help me. Fragment are very complex to understand. I solved my problem.
package com.****.****;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
/**
* Created by Calvin on 27/12/2014.
*/
public class heroes_Fragment extends Fragment implements OnClickListener{
Button btnChange;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.heroes_layout, container, false);
ImageButton btntrac = (ImageButton) view.findViewById(R.id.icontrac);
btntrac.setOnClickListener(this);
return view;
}
public void onClick(View v) {
trac(v);
}
android.support.v4.app.FragmentManager manager;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
manager=getFragmentManager();
}
public void trac(View view) {
android.support.v4.app.FragmentTransaction transaction =manager.beginTransaction();
transaction.replace(R.id.container,new trac_Fragment());
transaction.addToBackStack(null);
transaction.commit();
}
}
This is working.

We Keep Coding

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