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POlistview with bug
 

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    <p>I'm developing soundplayer app and when to run it on emulater it works but it does not work on physical device. The error when to click icon to start, I got an error and abended. Could someone take a look this code? here is the code.</p> <p>SoundPlayList Activity@</p> <pre><code>public class SoundPlayList extends Activity { public final static int PLAY_MUSIC = 0; private ListView mListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.soundplayerlist); mListView = (ListView)findViewById(R.id.listView1); SoundPlayerAdapter adapter = new SoundPlayerAdapter(this); mListView.setAdapter(adapter); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; parent,View view,int position,long id){ ListView listView = (ListView)parent; String item = (String)listView.getItemAtPosition(position); Intent intent = new Intent(SoundPlayList.this, SoundPlayerActivity.class); intent.putExtra("id",parent.getItemIdAtPosition(position)); intent.putExtra("name",item); startActivityForResult(intent,PLAY_MUSIC); } }); } </code></pre> <p>SoundPlayerAdapter@</p> <pre><code>public class SoundPlayerAdapter extends ArrayAdapter&lt;String&gt;{ private ArrayList&lt;Long&gt; mMusicIds = new ArrayList&lt;Long&gt;(); public SoundPlayerAdapter(Context context) { super(context, android.R.layout.simple_list_item_1); ContentResolver resolver = context.getContentResolver(); Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null); while(cursor.moveToNext()){ String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); long id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media._ID)); mMusicIds.add(id); this.add(name); } } public long getItemId(int position){ return mMusicIds.get(position); } } } </code></pre> <p>log trace@</p> <pre><code>11-12 15:45:04.985: D/AndroidRuntime(5288): Shutting down VM 11-12 15:45:04.985: W/dalvikvm(5288): threadid=1: thread exiting with uncaught exception (group=0x2aac8578) 11-12 15:45:04.985: E/AndroidRuntime(5288): FATAL EXCEPTION: main 11-12 15:45:04.985: E/AndroidRuntime(5288): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.soundplayer/com.example.soundplayer.SoundPlayList}: java.lang.NullPointerException 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread.access$1500(ActivityThread.java:121) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.os.Handler.dispatchMessage(Handler.java:99) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.os.Looper.loop(Looper.java:130) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread.main(ActivityThread.java:3701) 11-12 15:45:04.985: E/AndroidRuntime(5288): at java.lang.reflect.Method.invokeNative(Native Method) 11-12 15:45:04.985: E/AndroidRuntime(5288): at java.lang.reflect.Method.invoke(Method.java:507) 11-12 15:45:04.985: E/AndroidRuntime(5288): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 11-12 15:45:04.985: E/AndroidRuntime(5288): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624) 11-12 15:45:04.985: E/AndroidRuntime(5288): at dalvik.system.NativeStart.main(Native Method) 11-12 15:45:04.985: E/AndroidRuntime(5288): Caused by: java.lang.NullPointerException 11-12 15:45:04.985: E/AndroidRuntime(5288): at com.example.soundplayer.SoundPlayList$SoundPlayerAdapter.&lt;init&gt;(SoundPlayList.java:52) 11-12 15:45:04.985: E/AndroidRuntime(5288): at com.example.soundplayer.SoundPlayList.onCreate(SoundPlayList.java:29) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-12 15:45:04.985: E/AndroidRuntime(5288): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623) 11-12 15:45:04.985: E/AndroidRuntime(5288): ... 11 more 11-12 15:45:10.105: I/Process(5288): Sending signal. PID: 5288 SIG: 9 </code></pre>
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