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POClassCastException while setting callback for customView from Fragment
 

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  1. POClassCastException while setting callback for customView from Fragment
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    <p>I am trying to receive a CallBack in MyCustomView which is a class representing a Fragment( or we can say, it is view for Fragment) when i hit any element in ListFragment. Logs are attached Below:</p> <pre><code>04-12 11:56:04.321: D/FirstFragment(762): setting ui listener callback 04-12 11:56:04.321: D/AndroidRuntime(762): Shutting down VM 04-12 11:56:04.321: W/dalvikvm(762): threadid=1: thread exiting with uncaught exception (group=0x40015560) 04-12 11:56:04.331: E/AndroidRuntime(762): FATAL EXCEPTION: main 04-12 11:56:04.331: E/AndroidRuntime(762): java.lang.ClassCastException: com.gaurav.listing.ListFragmentActivity 04-12 11:56:04.331: E/AndroidRuntime(762): at com.gaurav.listing.FirstFragment.onListItemClick(FirstFragment.java:66) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.widget.AdapterView.performItemClick(AdapterView.java:284) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.widget.ListView.performItemClick(ListView.java:3513) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.os.Handler.handleCallback(Handler.java:587) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.os.Handler.dispatchMessage(Handler.java:92) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.os.Looper.loop(Looper.java:123) 04-12 11:56:04.331: E/AndroidRuntime(762): at android.app.ActivityThread.main(ActivityThread.java:3683) 04-12 11:56:04.331: E/AndroidRuntime(762): at java.lang.reflect.Method.invokeNative(Native Method) 04-12 11:56:04.331: E/AndroidRuntime(762): at java.lang.reflect.Method.invoke(Method.java:507) 04-12 11:56:04.331: E/AndroidRuntime(762): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 04-12 11:56:04.331: E/AndroidRuntime(762): at 04-12 11:56:04.331: E/AndroidRuntime(762): at dalvik.system.NativeStart.main(Native Method)com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) </code></pre> <p>and following i am attaching the Fragment's piece of code from where i am trying to set up this call back.</p> <pre><code>package com.gaurav.listing; import android.app.Activity; public class FirstFragment extends ListFragment { private static final String TAG = "FirstFragment"; public UIListener uiCallback; ArrayAdapter adapter; ListView list; View view; String[] values; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // some code here... } @Override public void onResume() { // some code here... } Activity activity = null; @Override public void onAttach(Activity activity) { super.onAttach(activity); try { this.activity = activity; uiCallback = (UIListener) activity; } catch (ClassCastException e) { } } @Override public void onListItemClick(ListView l, View v, int position, long id) { Log.d("FirstFragment", "onListItemClick"); String shape = l.getItemAtPosition(position).toString(); Log.d(TAG, shape); if (null == uiCallback) { Log.d("FirstFragment", "setting ui listener callback"); // problem occur here uiCallback = (UIListener) activity; } uiCallback.onButtonClicked(l, v, position, id, shape); } } </code></pre> <p>Please let me know how can i fix this problem. Some more details regarding target where i want to receive the callback: id of fragment: second_fragment view class for fragment: SecondFragment.java</p>
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    1. USKanishka Gupta
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