title: Android app crashing (fragment and xml onclick)
body: <p>second_fragment.xml</p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/f2_layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" &gt;
  
  &lt;TextView
      android:id="@+id/f2_textview"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/f2_tv" /&gt;
  
  &lt;Button
      android:id="@+id/f2_button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:onClick="button"
      android:text="@string/f2_bttn" /&gt;
  </code></pre>
  
  <p></p>
  
  <p>SecondFragment.java</p>
  
  <pre><code>   public class SecondFragment extends Fragment {
  
      FragmentInterface iface;
  
      public interface FragmentInterface {
          public void buttonPressed();
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
              Bundle savedInstanceState) {
  
          return inflater.inflate(R.layout.second_fragment, container, false);
      }
  
      @Override
      public void onAttach(Activity activity) {
          super.onAttach(activity);
  
          // This makes sure that the container activity has implemented
          // the callback interface. If not, it throws an exception
          try {
              iface = (FragmentInterface) activity;
          } catch (ClassCastException e) {
              throw new ClassCastException(activity.toString()
                      + " must implement FragmentInterface");
          }
  
      }
  
      public void button(View view) {
  
      }
  }
  </code></pre>
  
  <p>I'm newbie and I have no idea why my application crash, when button is pressed ? Can anyone explain?</p>
  
  <pre><code>01-03 13:28:25.612: E/AndroidRuntime(1276): FATAL EXCEPTION: main
  01-03 13:28:25.612: E/AndroidRuntime(1276): java.lang.IllegalStateException: Could not find a method button(View) in the activity class com.sp.fragments.MainActivity for onClick handler on view class android.widget.Button with id 'f2_button' 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$1.onClick(View.java:3584) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View.performClick(View.java:4202) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$PerformClick.run(View.java:17340) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Handler.handleCallback(Handler.java:725) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Handler.dispatchMessage(Handler.java:92) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.os.Looper.loop(Looper.java:137) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.app.ActivityThread.main(ActivityThread.java:5039) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.reflect.Method.invokeNative(Native Method) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.reflect.Method.invoke(Method.java:511) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at dalvik.system.NativeStart.main(Native Method) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): Caused by: java.lang.NoSuchMethodException: button [class android.view.View] 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.Class.getConstructorOrMethod(Class.java:460) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at java.lang.Class.getMethod(Class.java:915) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): at android.view.View$1.onClick(View.java:3577) 
  01-03 13:28:25.612: E/AndroidRuntime(1276): ... 11 more 
  01-03 13:28:27.563: I/Process(1276): Sending signal. PID: 1276 SIG: 9
  </code></pre>