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POFragment showing nullpointerexception
 

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  1. POFragment showing nullpointerexception
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    <p>I am working on SlidingPaneLayout for android 2.3.3. I have assigned an id to the fragment that I used to identify the fragment. But while identifying fragment by id it is showing "null pointerexecption". I don't know why it is showing so. The code is as shown below.</p> <p>Mainactivity.java</p> <pre><code>package com.example.slidpanelayout; import android.annotation.SuppressLint; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.widget.SlidingPaneLayout; import android.view.Menu; import android.view.View; @SuppressLint("NewApi") public class MainActivity extends FragmentActivity { SlidingPaneLayout Pane; View v; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Pane = (SlidingPaneLayout) findViewById(R.id.sp); Pane.setPanelSlideListener(new PaneListener()); getFragmentManager().findFragmentById(R.id.leftpane).setHasOptionsMenu(false); getFragmentManager().findFragmentById(R.id.rightpane).setHasOptionsMenu(true); } private class PaneListener implements SlidingPaneLayout.PanelSlideListener{ @Override public void onPanelClosed(View arg0) { // TODO Auto-generated method stub System.out.println("Panel closed"); getFragmentManager().findFragmentById(R.id.leftpane).setHasOptionsMenu(false); getFragmentManager().findFragmentById(R.id.rightpane).setHasOptionsMenu(true); } @Override public void onPanelOpened(View arg0) { // TODO Auto-generated method stub System.out.println("Panel Opened"); getFragmentManager().findFragmentById(R.id.leftpane).setHasOptionsMenu(true); getFragmentManager().findFragmentById(R.id.rightpane).setHasOptionsMenu(false); } @Override public void onPanelSlide(View arg0, float arg1) { // TODO Auto-generated method stub System.out.println("Sliding"); } } @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; } } </code></pre> <p>activity_main.xml</p> <pre><code>&lt;android.support.v4.widget.SlidingPaneLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/sp"&gt; &lt;fragment android:name="com.example.slidpanelayout.ListFragment" android:id="@+id/leftpane" android:layout_width="190dp" android:layout_height="match_parent" android:layout_gravity="left"/&gt; &lt;fragment android:name="com.example.slidpanelayout.ViewFragment" android:id="@+id/rightpane" android:layout_width="350dp" android:layout_height="match_parent" android:layout_gravity="right" /&gt; &lt;/android.support.v4.widget.SlidingPaneLayout&gt; </code></pre> <p>and logcat error as shown below.</p> <pre><code>11-13 06:24:05.479: E/AndroidRuntime(2375): FATAL EXCEPTION: main 11-13 06:24:05.479: E/AndroidRuntime(2375): Process: com.example.slidpanelayout, PID: 2375 11-13 06:24:05.479: E/AndroidRuntime(2375): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.slidpanelayout/com.example.slidpanelayout.MainActivity}: java.lang.NullPointerException 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread.access$700(ActivityThread.java:135) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.os.Handler.dispatchMessage(Handler.java:102) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.os.Looper.loop(Looper.java:137) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread.main(ActivityThread.java:4998) 11-13 06:24:05.479: E/AndroidRuntime(2375): at java.lang.reflect.Method.invokeNative(Native Method) 11-13 06:24:05.479: E/AndroidRuntime(2375): at java.lang.reflect.Method.invoke(Method.java:515) 11-13 06:24:05.479: E/AndroidRuntime(2375): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 11-13 06:24:05.479: E/AndroidRuntime(2375): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 11-13 06:24:05.479: E/AndroidRuntime(2375): at dalvik.system.NativeStart.main(Native Method) 11-13 06:24:05.479: E/AndroidRuntime(2375): Caused by: java.lang.NullPointerException 11-13 06:24:05.479: E/AndroidRuntime(2375): at com.example.slidpanelayout.MainActivity.onCreate(MainActivity.java:25) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.Activity.performCreate(Activity.java:5243) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 11-13 06:24:05.479: E/AndroidRuntime(2375): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140) 11-13 06:24:05.479: E/AndroidRuntime(2375): ... 11 more </code></pre> <p>Please help me on this.</p>
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    1. PO
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser2955143
    1. USuser2955143
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COwhat is in line 25..??
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      1. USAbhishek Patel
    2. COAre you sure you are loading the correct layout. Your code says "R.layout.activity_main" but your question says your file is called main.xml
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      1. POFragment showing nullpointerexception
      1. USKuffs
    3. COsetContentView(R.layout.activity_main); in this line you used activity_main, but your xml is main.xml.
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      1. USCENT1PEDE
 

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