启动意图导致ClassCastException

Question

我已经成功地设置了一个使用ActionBarSherlock的ActionBar，它设置了当我选择它时启动的意图。

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case R.id.menu_collection: 
      startActivity(new Intent(this, Collection.class)); 
      return true; 
     case R.id.menu_wishlist: 
      startActivity(new Intent(this, Wishlist.class)); 
      return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

的问题是，当这个意图应该开始我得到这个错误：

09-10 20:30:15.496: E/AndroidRuntime(334): FATAL EXCEPTION: main 
09-10 20:30:15.496: E/AndroidRuntime(334): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mypackage.thing/com.mypackage.thing.Wishlist}: java.lang.ClassCastException: com.mypackage.thing.Wishlist 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.os.Looper.loop(Looper.java:123) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread.main(ActivityThread.java:3683) 
09-10 20:30:15.496: E/AndroidRuntime(334): at java.lang.reflect.Method.invokeNative(Native Method) 
09-10 20:30:15.496: E/AndroidRuntime(334): at java.lang.reflect.Method.invoke(Method.java:507) 
09-10 20:30:15.496: E/AndroidRuntime(334): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
09-10 20:30:15.496: E/AndroidRuntime(334): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
09-10 20:30:15.496: E/AndroidRuntime(334): at dalvik.system.NativeStart.main(Native Method) 
09-10 20:30:15.496: E/AndroidRuntime(334): Caused by: java.lang.ClassCastException: com.mypackage.thing.Wishlist 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
09-10 20:30:15.496: E/AndroidRuntime(334): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561) 
09-10 20:30:15.496: E/AndroidRuntime(334): ... 11 more 

是有点不妥的应该启动或在XML文件中的类？我正在使用支持包以及ActionBarSherlock。我试着检查清单和布局，但没有什么似乎是错的。此外，我很新的碎片，所以不知道如果设置正确。这是应该启动类有：然后

... 
    import com.actionbarsherlock.app.SherlockListFragment; 
    import com.mypackage.thing.contentprovider.DatabaseProvider; 
    import com.mypackage.thing.database.WishlistTable; 

    public class Wishlist extends SherlockListFragment 
       implements LoaderManager.LoaderCallbacks<Cursor> { 

    ... 

    //Inflate ListFragment view 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     return inflater.inflate(R.layout.wishlist, container, false); 
    } 

    ... 

类被设置为使用cursorLoader和供应商/ CursorAdapter的填充从SQLite的列表。

Answer 1

您的WishList类延伸SherlockListFragment。这不是一个Activity类（见ListFragment。

为了把这个在Activity，你必须创建一个新的FragmentActivity（或者更确切地说，SherlockFragmentActivity）承载此片段。This documentation可以帮助你。