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PONull Pointer Exception on Fragment Manager
 

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    <p>I have a <code>ActivityFragments</code> with three<code>Buttons</code> and <code>FragmentOne</code>, <code>FragmentTwo</code>, <code>FragmentThree</code> classes. When <code>Button1</code> is pressed it has to show <code>FragmentOne</code> and hide <code>FragmentTwo</code> and <code>FragmentThree</code>. If <code>Button2</code> is pressed it has to show <code>FragmentTwo</code> and hide <code>FragmentOne</code> and <code>FragmentThree</code>. Similarly if<code>Button3</code> is pressed it has to show <code>FragmentThree</code> and hide <code>FragmentTwo</code> and <code>FragmentOne</code>. My code didn't work showing <code>NullPointerException E/AndroidRuntime(362): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:656)</code> </p> <p><strong>Logcat:</strong> </p> <pre><code>04-08 08:10:31.830: E/AndroidRuntime(362): FATAL EXCEPTION: main 04-08 08:10:31.830: E/AndroidRuntime(362): java.lang.NullPointerException 04-08 08:10:31.830: E/AndroidRuntime(362): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:656) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.os.Handler.handleCallback(Handler.java:587) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.os.Handler.dispatchMessage(Handler.java:92) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.os.Looper.loop(Looper.java:123) 04-08 08:10:31.830: E/AndroidRuntime(362): at android.app.ActivityThread.main(ActivityThread.java:4627) 04-08 08:10:31.830: E/AndroidRuntime(362): at java.lang.reflect.Method.invokeNative(Native Method) 04-08 08:10:31.830: E/AndroidRuntime(362): at java.lang.reflect.Method.invoke(Method.java:521) 04-08 08:10:31.830: E/AndroidRuntime(362): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 04-08 08:10:31.830: E/AndroidRuntime(362): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 04-08 08:10:31.830: E/AndroidRuntime(362): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p><a href="http://pastebin.com/0yRVfpjV" rel="nofollow">You can find it here too </a></p> <p>And this is the code : <strong>MainActivity.java</strong></p> <pre><code> public class MainActivity extends FragmentActivity implements OnClickListener { Button b1, b2, b3; Fragment f1, f2, f3; FragmentManager manager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b1 = (Button) findViewById(R.id.button1); b2 = (Button) findViewById(R.id.button2); b3 = (Button) findViewById(R.id.button3); b1.setOnClickListener(this); b2.setOnClickListener(this); b3.setOnClickListener(this); manager = getSupportFragmentManager(); f1 = manager.findFragmentById(R.id.first); f2 = manager.findFragmentById(R.id.second); f2 = manager.findFragmentById(R.id.third); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.button1: if(b1.isPressed()){ FragmentTransaction transaction = getSupportFragmentManager() .beginTransaction(); transaction.hide(f2); transaction.hide(f3); transaction.show(f1); transaction.commit(); } break; case R.id.button2: if(b2.isPressed()){ FragmentTransaction transaction1 = getSupportFragmentManager() .beginTransaction(); transaction1.hide(f1); transaction1.hide(f3); transaction1.show(f2); transaction1.commit(); } break; case R.id.button3: if(b3.isPressed()){ FragmentTransaction transaction2 = getSupportFragmentManager() .beginTransaction(); transaction2.hide(f1); transaction2.hide(f2); transaction2.show(f3); transaction2.commit(); } break; } } } public class FirstFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.first, container, false); return view; } } public class SecondFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.second, container, false); return view; } } public class Third extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.third, container, false); return view; } } </code></pre> <p>Layout file : <strong>main.xml</strong></p> <pre><code>&lt;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: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=".MainActivity" &gt; &lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="Button 1" /&gt; &lt;Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/button1" android:layout_toRightOf="@+id/button1" android:text="Button 2" /&gt; &lt;Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/button2" android:layout_toRightOf="@+id/button2" android:text="Button 3" /&gt; &lt;LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignLeft="@+id/button1" android:layout_below="@+id/button1" android:orientation="horizontal" &gt; &lt;fragment android:id="@+id/first" android:layout_width="match_parent" android:layout_height="wrap_content" class="com.fragmentworks.FirstFragment" /&gt; &lt;fragment android:id="@+id/second" android:layout_width="match_parent" android:layout_height="wrap_content" class="com.fragmentworks.SecondFragment" /&gt; &lt;fragment android:id="@+id/third" android:layout_width="match_parent" android:layout_height="wrap_content" class="com.fragmentworks.Third" /&gt; &lt;/LinearLayout&gt; </code></pre> <p></p>
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