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android.view.InflateException: Binary XML file line #16: Error inflating class <unknown> (ListView Maybe?) [duplicate]

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android.view.InflateException: Binary XML file line #16: Error inflating class fragment
Closed 6 years ago.
I made an app, it works well in virtual device and real device, but today my app is throwing exceptions, maybe it is the same with some old errors in here, but I can not find my own answer for this. So, please tell me how to solve it, thanks so much
here is my logcat
FATAL EXCEPTION: main
Process: com.gvc.tvschedule, PID: 1918
android.view.InflateException: Binary XML file line #16: Error inflating class <unknown>
at android.view.LayoutInflater.createView(LayoutInflater.java:620)
at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
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.widget.SimpleAdapter.createViewFromResource(SimpleAdapter.java:121)
at android.widget.SimpleAdapter.getView(SimpleAdapter.java:114)
at android.widget.AbsListView.obtainView(AbsListView.java:2255)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
at android.widget.ListView.onMeasure(ListView.java:1175)
at android.view.View.measure(View.java:16497)
at android.widget.RelativeLayout.measureChild(RelativeLayout.java:689)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:473)
at android.view.View.measure(View.java:16497)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16497)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
at android.view.View.measure(View.java:16497)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.view.LayoutInflater.createView(LayoutInflater.java:594)
... 48 more
Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x12/d=0x0 a=2 r=0x7f0b0068}
at android.content.res.Resources.loadDrawable(Resources.java:2073)
at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
at android.widget.TextView.<init>(TextView.java:806)
at android.widget.TextView.<init>(TextView.java:618)
... 51
here under is Layout XML: getprogram_main.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">
<RelativeLayout
android:id="#+id/relativeLayoutProgram"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_below="#+id/relativeLayoutProgram"
android:orientation="vertical"
android:layout_marginTop="40dp">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true">
</ListView>
<!-- #android:id/list or #id/android:list -->
</RelativeLayout>
</RelativeLayout>
and: view_program_entry.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/programtime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:paddingTop="15sp"
android:paddingLeft="6sp"
android:textStyle="bold"/>
<TextView
android:id="#+id/programtitle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:textStyle="bold"
android:drawableLeft="#+id/programtime" />
<!-- android:background="#color/blue2" -->
</LinearLayout>
and Java : ProgramPickerActivity.java
package com.gvc.tvschedule;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.gvc.service.DBController;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class ProgramPickerActivity extends Activity {
// DB Class to perform DB related operations
DBController controller = new DBController(this);
// Progress Dialog Object
ProgressDialog prgDialog;
HashMap<String, String> queryValues;
private static String titleTextFromView;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.getprogram_main);
ArrayList<HashMap<String, String>> programList = controller.generalProgram(MainActivity.getNameOfChannel(), DatePickerActivity.getDate());
if (programList.size() != 0) {
// Set the User Array list in ListView
ListAdapter adapter = new SimpleAdapter(getApplicationContext(), programList, R.layout.view_program_entry, new String[] {
"ptime", "ptitle" }, new int[] { R.id.programtime, R.id.programtitle });
ListView myList = (ListView) findViewById(android.R.id.list);
myList.setAdapter(adapter);
myList.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
TextView titleVIew = (TextView) view.findViewById(R.id.programtitle);
titleTextFromView = titleVIew.getText().toString();
createPopupWindownForDescription(titleTextFromView);
}
});
}
prgDialog = new ProgressDialog(this);
prgDialog.setMessage("loading...");
prgDialog.setCancelable(false);
}
private void createPopupWindownForDescription(String pTitle){
String content = controller.getDescription(pTitle);
AlertDialog.Builder builder = new AlertDialog.Builder(ProgramPickerActivity.this);
builder.setTitle("Content");
builder.setMessage(content);
builder.show();
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
if(prgDialog!=null)
prgDialog.dismiss();
}
public static String getTitleTextFromView(){
return titleTextFromView;
}
}
I think the trouble is related with the listview, because, when no data put on listview, it is fine, but with data, it threw the errors.

I believe your current problem is
<TextView
android:id="#+id/programtitle"
...
android:drawableLeft="#+id/programtime" /> // HERE
You are referencing the other TextView but you should be referencing a Drawable. My guess is that you want to put it to the left of the other TextView?
If this is the case, the LinearLayout will lay them out from left to right by default so you just need to put them in the order that you want them to appear. Also, not a problem but since they are left to right by default, there's no need for
android:orientation="horizontal"
It's not showing when you don't have any items in your ListView because the layout is never inflated so the error is never caught.
Docs

android:id="#+id/list"
use that, you're welcome
PS: Change
ListView myList = (ListView) findViewById(android.R.id.list);
for:
ListView myList = (ListView) findViewById(R.id.list);

Android Runtime Crash

I'm new to Android development and trying to build my first application. I'm currently trying to build a simple counter that allows the user to increment the total by +1, -1, +5, -5 with the starting value being 20. When I try to run my app it always crashes immediately and I'm completely stuck on how to fix it.
Here is my code:
package com.example.mtglifecounter;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
int Total=20;
Button Plus1, Min1, Plus5, Min5;
EditText Display;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Total = 20;
Plus1 = (Button) findViewById(R.id.btnPlus1);
Min1 = (Button) findViewById(R.id.btnMin1);
Plus5 = (Button) findViewById(R.id.btnPlus5);
Min5 = (Button) findViewById(R.id.btnmin5);
Display = (EditText) findViewById(R.id.tvTotal);
Display.setText(Total);
Plus1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Adds 1 to the counter
Total = Total + 1;
Display.setText(Total);
}
});
Min1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Subtract 1 from counter
Total = Total - 1;
Display.setText(Total);
}
});
Plus5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Adds 1 to the counter
Total = Total + 5;
Display.setText(Total);
}
});
Min5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Subtract 1 from counter
Total = Total - 5;
Display.setText(Total);
}
});
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#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();
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 {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
I also have a logcat that I saved:
04-11 11:56:27.433: D/AndroidRuntime(1459): Shutting down VM
04-11 11:56:27.433: W/dalvikvm(1459): threadid=1: thread exiting with uncaught exception (group=0xb1aabba8)
04-11 11:56:27.453: E/AndroidRuntime(1459): FATAL EXCEPTION: main
04-11 11:56:27.453: E/AndroidRuntime(1459): Process: com.example.mtglifecounter, PID: 1459
04-11 11:56:27.453: E/AndroidRuntime(1459): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mtglifecounter/com.example.mtglifecounter.MainActivity}: java.lang.NullPointerException
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.os.Handler.dispatchMessage(Handler.java:102)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.os.Looper.loop(Looper.java:136)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-11 11:56:27.453: E/AndroidRuntime(1459): at java.lang.reflect.Method.invokeNative(Native Method)
04-11 11:56:27.453: E/AndroidRuntime(1459): at java.lang.reflect.Method.invoke(Method.java:515)
04-11 11:56:27.453: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-11 11:56:27.453: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-11 11:56:27.453: E/AndroidRuntime(1459): at dalvik.system.NativeStart.main(Native Method)
04-11 11:56:27.453: E/AndroidRuntime(1459): Caused by: java.lang.NullPointerException
04-11 11:56:27.453: E/AndroidRuntime(1459): at com.example.mtglifecounter.MainActivity.onCreate(MainActivity.java:34)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.Activity.performCreate(Activity.java:5231)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-11 11:56:27.453: E/AndroidRuntime(1459): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-11 11:56:27.453: E/AndroidRuntime(1459): ... 11 more
04-11 11:56:33.373: I/Process(1459): Sending signal. PID: 1459 SIG: 9
I would really appreciate any help you can give me since this is my first try at Android.
Thanks
Here is the activity_Main.xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mtglifecounter.MainActivity"
tools:ignore="MergeRootFrame" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.mtglifecounter.MainActivity$PlaceholderFragment" >
<EditText
android:id="#+id/etTotal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/LifeTotal"
android:ems="10"
android:inputType="number"
android:text="20" />
<Button
android:id="#+id/btnmin5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/btnPlus5"
android:layout_alignBottom="#+id/btnPlus5"
android:layout_alignLeft="#+id/btnMin1"
android:onClick="On_Clicked"
android:text="-5" />
<Button
android:id="#+id/btnMin1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/btnPlus1"
android:layout_alignBottom="#+id/btnPlus1"
android:layout_alignLeft="#+id/LifeTotal"
android:layout_marginLeft="37dp"
android:onClick="On_Clicked"
android:text="-1" />
<Button
android:id="#+id/btnPlus5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/tvTotal"
android:layout_below="#+id/btnPlus1"
android:layout_marginRight="60dp"
android:layout_marginTop="25dp"
android:onClick="On_Clicked"
android:text="+5" />
<Button
android:id="#+id/btnPlus1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/btnPlus5"
android:layout_below="#+id/LifeTotal"
android:layout_marginTop="44dp"
android:onClick="On_Clicked"
android:text="+1" />
<TextView
android:id="#+id/LifeTotal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/tvTotal"
android:layout_alignParentLeft="true"
android:layout_marginLeft="21dp"
android:text="Life Total:"
android:textSize="#dimen/abc_action_bar_title_text_size" />

As per your code and layout , issue is with the EditText Id.
You are trying to find the EditText view using the Button Id
As per your layout change this line
Display = (EditText) findViewById(R.id.tvTotal);
to
Display = (EditText) findViewById(R.id.etTotal);
Also , the other issue is in setText to EditText
Display.setText(Total);
Total is an int. It should be a String or should be a valid String Resource ID
If you are setting an integer , it will be considered as Resource Id
This what the setText method does...
public final void setText(int resid) {
setText(getContext().getResources().getText(resid));
}
Either, change the int to pass the correct string Resource Id or convert the int to string like this
Display.setText(Integer.toString(Total));

You should use a debugger. Step each line in your onCreate method until you see a value that is wrong - probably a null pointer. You don't say how you built your application but using both Eclipse or Android Studio allow line by line debug stepping. Use this feature and it will allow you to find your bugs quickly and easily.
https://developer.android.com/tools/debugging/debugging-projects.html

make sure all of these exists in your layout activity_mail.xml
Plus1 = (Button) findViewById(R.id.btnPlus1);
Min1 = (Button) findViewById(R.id.btnMin1);
Plus5 = (Button) findViewById(R.id.btnPlus5);
Min5 = (Button) findViewById(R.id.btnmin5);
Display = (EditText) findViewById(R.id.tvTotal);
And by that I mean, check if there is a Button with ID btnPlus1 , then check if there is a Button with ID btnMin1, and so on.
Since the exception is a NullPointerException the problem is probably that you mistyped an ID and one (or more) of them is returning null.

NullpointerException in Listview on android

Hello everyone I'm working with a ListView and when i open the activity my app crashes due to a NullPointerException. Everything is declared, so I really have no idea of why this is happening.
So I have this layouts:
delete.xml:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#color/background"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView android:id="#android:id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content"></ListView>
<Button
android:id="#+id/btn_deleteAll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/deleteAll"/>
</LinearLayout>
</ScrollView>
And item.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</RelativeLayout>
And my ListActivity class is:
package com.example.calendar;
import com.example.calendar.DBHandler;
import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class DeleteAppointment extends ListActivity implements OnClickListener{
DBHandler db;
Appointment app;
ListView list;
Cursor cursor;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.delete);
Button deleteAll = (Button)findViewById(R.id.btn_deleteAll);
list = (ListView) findViewById(R.id.list);
deleteAll.setOnClickListener(this);
db = new DBHandler(this);
cursor = getContentResolver().query(db.CONTENT_URI, new String[]{app._date, app._title, app._time, app._details}, null, null, "asc");
startManagingCursor(cursor);
String[] columns = new String[]{app._date, app._title, app._time, app._details};
int[] to = new int[]{R.id.date, R.id.name, R.id.time, R.id.details};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item, cursor, columns, to);
this.setListAdapter(adapter);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btn_deleteAll:
finish();
break;
}
}
}
The line where it crashes is line 28, which is
cursor = getContentResolver().query(db.CONTENT_URI, new String[]{app._date, app._title, app._time, app._details}, null, null, "asc");
Logcat stacktrace:
03-23 18:54:51.705: E/AndroidRuntime(1070): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.calendar/com.example.calendar.DeleteAppointment}: java.lang.NullPointerException
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread.access$600(ActivityThread.java:122)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.os.Handler.dispatchMessage(Handler.java:99)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.os.Looper.loop(Looper.java:137)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread.main(ActivityThread.java:4340)
03-23 18:54:51.705: E/AndroidRuntime(1070): at java.lang.reflect.Method.invokeNative(Native Method)
03-23 18:54:51.705: E/AndroidRuntime(1070): at java.lang.reflect.Method.invoke(Method.java:511)
03-23 18:54:51.705: E/AndroidRuntime(1070): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-23 18:54:51.705: E/AndroidRuntime(1070): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-23 18:54:51.705: E/AndroidRuntime(1070): at dalvik.system.NativeStart.main(Native Method)
03-23 18:54:51.705: E/AndroidRuntime(1070): Caused by: java.lang.NullPointerException
03-23 18:54:51.705: E/AndroidRuntime(1070): at com.example.calendar.DeleteAppointment.onCreate(DeleteAppointment.java:28)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.Activity.performCreate(Activity.java:4465)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-23 18:54:51.705: E/AndroidRuntime(1070): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
Please help me.

app is not initialized in your code. you need initialize that before using
you need something like:
app = new Appointment();
and if you are using a ListActivity, you need to have a ListView who's id is android.R.list in your layout file.

Use android.R.id.list or getListView() instead of R.id.list to initialize ListView :
list = (ListView) findViewById(android.R.id.list);
OR
list = getListView();

Passing data between the fragments

I am trying to pass the data from edittext of one fragment to textview associated with other fragment
I am following static way of passing data between fragments
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="#+id/fragment2"
android:name="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment
android:id="#+id/fragment1"
android:name="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
fragment1.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" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="80dp"
android:ems="10" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Click to send data to next Activity" />
</RelativeLayout>
fragment2.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" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="TextView"
android:textSize="40dp" />
</RelativeLayout>
Fragment1.java
package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Fragment1 extends Fragment{
Button button;
EditText textedit;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view=inflater.inflate(R.layout.fragment_1, container, false);
button=(Button) view.findViewById(R.id.button1);
textedit=(EditText) view.findViewById(R.id.editText1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager FM = getFragmentManager();
Fragment2 f2=(Fragment2) FM.findFragmentById(R.id.fragment2);
f2.setName(textedit.getText().toString());
}
});
return view;
}
}
Fragment2.java
package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment2 extends Fragment{
View view;
TextView txtview;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
view=inflater.inflate(R.layout.fragment_2, container, false);
return view;
}
public void setName(String Name){
txtview=(TextView) view.findViewById(R.id.textView1);
txtview.setText("Hello:: " +Name);
}
}
[Edit]
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="#+id/fragment2"
class="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment
android:id="#+id/fragment1"
class="com.example.usingtwofragmentsfornavigatingbetweentwoactivities.Fragment1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Fragment1.java
package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Fragment1 extends Fragment{
Button button;
EditText textedit;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view=inflater.inflate(R.layout.fragment_1, container, false);
button=(Button) view.findViewById(R.id.button1);
textedit=(EditText) view.findViewById(R.id.editText1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager FM = getActivity().getSupportFragmentManager();
Fragment2 f2=(Fragment2) FM.findFragmentById(R.id.fragment2);
f2.setName(textedit.getText().toString());
}
});
return view;
}
}
Log::
10-30 14:37:32.900: D/AndroidRuntime(460): Shutting down VM
10-30 14:37:32.900: W/dalvikvm(460): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
10-30 14:37:32.940: E/AndroidRuntime(460): FATAL EXCEPTION: main
10-30 14:37:32.940: E/AndroidRuntime(460): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.usingtwofragmentsfornavigatingbetweentwoactivities/com.example.usingtwofragmentsfornavigatingbetweentwoactivities.MainActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.os.Handler.dispatchMessage(Handler.java:99)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.os.Looper.loop(Looper.java:123)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread.main(ActivityThread.java:4627)
10-30 14:37:32.940: E/AndroidRuntime(460): at java.lang.reflect.Method.invokeNative(Native Method)
10-30 14:37:32.940: E/AndroidRuntime(460): at java.lang.reflect.Method.invoke(Method.java:521)
10-30 14:37:32.940: E/AndroidRuntime(460): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-30 14:37:32.940: E/AndroidRuntime(460): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-30 14:37:32.940: E/AndroidRuntime(460): at dalvik.system.NativeStart.main(Native Method)
10-30 14:37:32.940: E/AndroidRuntime(460): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
10-30 14:37:32.940: E/AndroidRuntime(460): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.Activity.setContentView(Activity.java:1647)
10-30 14:37:32.940: E/AndroidRuntime(460): at com.example.usingtwofragmentsfornavigatingbetweentwoactivities.MainActivity.onCreate(MainActivity.java:12)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
10-30 14:37:32.940: E/AndroidRuntime(460): ... 11 more
10-30 14:37:32.940: E/AndroidRuntime(460): Caused by: java.lang.ClassNotFoundException: android.view.fragment in loader dalvik.system.PathClassLoader[/data/app/com.example.usingtwofragmentsfornavigatingbetweentwoactivities-2.apk]
10-30 14:37:32.940: E/AndroidRuntime(460): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
10-30 14:37:32.940: E/AndroidRuntime(460): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
10-30 14:37:32.940: E/AndroidRuntime(460): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.createView(LayoutInflater.java:466)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:544)
10-30 14:37:32.940: E/AndroidRuntime(460): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
10-30 14:37:32.940: E/AndroidRuntime(460): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
10-30 14:37:32.940: E/AndroidRuntime(460): ... 20 more
MainActivity.java
package com.example.usingtwofragmentsfornavigatingbetweentwoactivities;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
How to resolve this ?

java.lang.ClassNotFoundException: android.view.fragment
you are not this importing fragment from the support library and your device is older pre Android 3. It should be
import android.support.v4.app.Fragment;
also in your xml change
android:name
with
class

Inside Fragment1 onclick of button1, do something like this:
FragmentManager FM = getActivity().getSupportFragmentManager();
Fragment2 f2=(Fragment2) FM.findFragmentById(R.id.fragment2);
f2.setName(textedit.getText().toString());
I hope it will be helpful !!

NullPointException in ListView

Please have a look at the following code
activity_form.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=".Form" >
<ImageView
android:id="#+id/logo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:src="#drawable/logo" />
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/logo"
android:layout_marginTop="10dp"
android:text="#string/title" />
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/title"
android:layout_marginTop="10dp"
/>
</RelativeLayout>
list_layout.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="horizontal" >
<ImageView
android:id="#+id/listImage"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#drawable/star" />
<TextView
android:id="#+id/listText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:paddingTop="10dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
Form.java
package com.example.callmanager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class Form extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_form);
ListView lv = (ListView)findViewById(android.R.id.list);
String arr[] = getResources().getStringArray(R.array.branch_list);
lv.setAdapter(new MyAdapter(this,android.R.layout.simple_list_item_1,R.id.listText,arr));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_form, menu);
return true;
}
private class MyAdapter extends ArrayAdapter
{
public MyAdapter(Context context, int resource, int textViewResourceId,
Object[] objects) {
super(context, resource, textViewResourceId, objects);
// TODO Auto-generated constructor stub
}
#Override
public View getView(int position, View contentView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.list_layout, parent,false);
TextView tv = (TextView)findViewById(R.id.listText);
ImageView iv = (ImageView)findViewById(R.id.listImage);
String arr[] = getResources().getStringArray(R.array.branch_list);
tv.setText(arr[position]);
if(arr[position].equals("Anuradhapura"))
iv.setImageResource(R.drawable.star);
return view;
}
}
}
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Esoft Call Manager</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title"><b>Select a Branch To Call</b></string>
<string-array name="branch_list">
<item>Anuradhapura</item>
<item>Avissawella</item>
</string-array>
</resources>
When I run this code, I get the 'NullPointException'. I am adding the complete log file here
02-08 21:04:01.463: D/dalvikvm(490): GC_EXTERNAL_ALLOC freed 43K, 53% free 2551K/5379K, external 1949K/2137K, paused 82ms
02-08 21:04:01.713: D/AndroidRuntime(490): Shutting down VM
02-08 21:04:01.713: W/dalvikvm(490): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-08 21:04:01.733: E/AndroidRuntime(490): FATAL EXCEPTION: main
02-08 21:04:01.733: E/AndroidRuntime(490): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.callmanager/com.example.callmanager.Form}: java.lang.NullPointerException
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.os.Handler.dispatchMessage(Handler.java:99)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.os.Looper.loop(Looper.java:123)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-08 21:04:01.733: E/AndroidRuntime(490): at java.lang.reflect.Method.invokeNative(Native Method)
02-08 21:04:01.733: E/AndroidRuntime(490): at java.lang.reflect.Method.invoke(Method.java:507)
02-08 21:04:01.733: E/AndroidRuntime(490): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-08 21:04:01.733: E/AndroidRuntime(490): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-08 21:04:01.733: E/AndroidRuntime(490): at dalvik.system.NativeStart.main(Native Method)
02-08 21:04:01.733: E/AndroidRuntime(490): Caused by: java.lang.NullPointerException
02-08 21:04:01.733: E/AndroidRuntime(490): at com.example.esoftcallmanager.Form.onCreate(Form.java:24)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-08 21:04:01.733: E/AndroidRuntime(490): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
02-08 21:04:01.733: E/AndroidRuntime(490): ... 11 more
I am adding the folder structure below if it helps
Why I am getting this error? How to solve this? Please help!

try this:
change this
ListView lv = (ListView)findViewById(android.R.id.list);
for:
ListView lv = (ListView)findViewById(R.id.list);
Normally they use android.R.id.list when class extends a ListActivity

Change:
ListView lv = (ListView)findViewById(android.R.id.list);
to
ListView lv = (ListView)findViewById(R.id.list);
Unless you have an id in your XML in the format of android:id="#android:id/myID", you don't need to use android.R. Whenever you use one of your own IDs, you can simply use R.id.Whatever

The issue is right here. ListView lv = (ListView)findViewById(android.R.id.list); you reference the Id android.R.id.list
however in your layout you reference android:id="#+id/list" which creates an Id in the Resources class called list. so you should be referencing R.id.list if you debug you will find that the lv variable is null because it wasn't found because you referenced the wrong id.

If your are using your own layout you don't need any more to write android.R just remove android and reorganize your class

Try this.
I hope it will solve your NPE.
Change it
ListView lv = (ListView)findViewById(android.R.id.list);
to
ListView lv = (ListView)findViewById(R.id.list);
Actually You have defined the list view in the layout activity_form.xml have name list so you need to write the R.id.list.

I managed to solve this by my self. Following edits were required.
activity_form.xml
The "id" of the ListView should be
android:id="#android:id/list"
Form.java
It should call the ListView in this way
ListView lv = (ListView) findViewById(android.R.id.list);
Inside getView(), the initialization of the TextView and ImageView should be like this
TextView tv = (TextView) view.findViewById(R.id.listText);
ImageView iv = (ImageView) view.findViewById(R.id.listImage);
Note the view.findViewById() part.