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POCalling Activity Method In Fragment Causing Application To Crash
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copied!<p>I am trying to use the myMethod found in TestActivity, but the application crashes. If I put the same method inside MainActivity and then use </p> <pre><code> ((MainActivity) getActivity()).myMethod(); </code></pre> <p>The code works, but it won't let me call a method found in the TestActivity? Thanks</p> <p>my Main Activity package info.androidhive.tabsswipe;</p> <pre><code> public class MainActivity extends FragmentActivity implements ActionBar.TabListener { ... } </code></pre> <p>GamesFragment</p> <pre><code> public class GamesFragment extends Fragment implements OnClickListener { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_games, container, false); Button showButton = (Button) rootView.findViewById(R.id.Btn_Show); showButton.setOnClickListener (this); return rootView; } public interface YourInterface { public void yourMethod(); } private YourInterface yourInterface ; @Override public void onAttach(Activity activity){ super.onAttach(activity); try { yourInterface = (TestActivity) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement YourInterface"); } } public void onClick(View v) { switch (v.getId()) { case R.id.Btn_Show: yourInterface .yourMethod(); break; } } } </code></pre> <p>Test Activity</p> <pre><code> public class TestActivity extends FragmentActivity implements OnClickListener, YourInterface { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.lyt_test); } public void yourMethod(){ Toast.makeText(getApplicationContext(),"Text!",Toast.LENGTH_SHORT).show(); } </code></pre> <p>Log Cat</p> <pre><code>11-02 19:33:15.468: E/Trace(1952): error opening trace file: No such file or directory (2) 11-02 19:33:15.560: D/AndroidRuntime(1952): Shutting down VM 11-02 19:33:15.560: W/dalvikvm(1952): threadid=1: thread exiting with uncaught exception (group=0xa62fa288) 11-02 19:33:15.560: E/AndroidRuntime(1952): FATAL EXCEPTION: main 11-02 19:33:15.560: E/AndroidRuntime(1952): java.lang.ClassCastException: info.androidhive.tabsswipe.MainActivity@a6d853c0 must implement YourInterface 11-02 19:33:15.560: E/AndroidRuntime(1952): at info.androidhive.tabsswipe.GamesFragment.onAttach(GamesFragment.java:40) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:883) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.View.measure(View.java:15172) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.View.measure(View.java:15172) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.View.measure(View.java:15172) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 11-02 19:33:15.560: E/AndroidRuntime(1952): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.View.measure(View.java:15172) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.Choreographer.doCallbacks(Choreographer.java:555) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.Choreographer.doFrame(Choreographer.java:525) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.os.Handler.handleCallback(Handler.java:615) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.os.Handler.dispatchMessage(Handler.java:92) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.os.Looper.loop(Looper.java:137) 11-02 19:33:15.560: E/AndroidRuntime(1952): at android.app.ActivityThread.main(ActivityThread.java:4745) 11-02 19:33:15.560: E/AndroidRuntime(1952): at java.lang.reflect.Method.invokeNative(Native Method) 11-02 19:33:15.560: E/AndroidRuntime(1952): at java.lang.reflect.Method.invoke(Method.java:511) 11-02 19:33:15.560: E/AndroidRuntime(1952): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 11-02 19:33:15.560: E/AndroidRuntime(1952): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-02 19:33:15.560: E/AndroidRuntime(1952): at dalvik.system.NativeStart.main(Native Method) </code></pre>

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