創建對話框時崩潰

Question

我有一個活動，當按下按鈕時啓動時間選擇器對話框。但是，當按下按鈕時，對話框不會出現，應用程序崩潰。我已經在下面顯示了我所有的相關代碼。

如果有人能幫我解決這個問題，我將非常感激。

謝謝你的幫助。

活動代碼

public class SecondActivity extends Activity implements TimePickerFragment.OnCompleteListener 

    { 


     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_second); 


     } 

     public void showTimePickerDialog(View v) { 
      DialogFragment newFragment = new TimePickerFragment(); 
      newFragment.show(getFragmentManager(), "timePicker"); 
     } 





      public void onComplete(String time) { 

       Button btn = (Button) findViewById(R.id.start_time_button); 
       btn.setText(time); 

      } 
     } 

對話框片段

public class TimePickerFragment extends DialogFragment 
implements TimePickerDialog.OnTimeSetListener { 



@Override 
public Dialog onCreateDialog(Bundle savedInstanceState) { 
// Use the current time as the default values for the picker 
final Calendar c = Calendar.getInstance(); 
int hour = c.get(Calendar.HOUR_OF_DAY); 
int minute = c.get(Calendar.MINUTE); 

// Create a new instance of TimePickerDialog and return it 
return new TimePickerDialog(getActivity(), this, hour, minute, 
DateFormat.is24HourFormat(getActivity())); 
} 

public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
// Do something with the time chosen by the user 

    String time =Integer.toString(hourOfDay)+" : " +Integer.toString(minute); 
    this.mListener.onComplete(time); 

} 


     public static interface OnCompleteListener { 
      public abstract void onComplete(String time); 
} 

      private OnCompleteListener mListener; 

      // make sure the Activity implemented it 
      public void onAttach(Activity activity) { 
       try { 
        this.mListener = (OnCompleteListener)activity; 
    } 
       catch (final ClassCastException e) { 
        throw new ClassCastException(activity.toString() + " must implement OnCompleteListener"); 
    } 
} 


} 

XML

<LinearLayout 
    android:id="@+id/timeinput" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_weight="0" 
    android:layout_marginTop="20dp" 
    android:orientation="horizontal" > 


     <Button 
     android:id="@+id/start_time_button" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_weight="0" 
     android:layout_marginLeft="30dp" 
     android:padding="10dp" 
     android:onClick="showTimePickerDialog" /> 


</LinearLayout> 

logcat的

02-28 18:16:11.429: D/AbsListView(23796): Get MotionRecognitionManager 
02-28 18:16:11.479: D/libEGL(23796): loaded /system/lib/egl/libEGL_mali.so 
02-28 18:16:11.484: D/libEGL(23796): loaded /system/lib/egl/libGLESv1_CM_mali.so 
02-28 18:16:11.489: D/libEGL(23796): loaded /system/lib/egl/libGLESv2_mali.so 
02-28 18:16:11.494: D/(23796): Device driver API match 
02-28 18:16:11.494: D/(23796): Device driver API version: 10 
02-28 18:16:11.494: D/(23796): User space API version: 10 
02-28 18:16:11.494: D/(23796): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
02-28 18:16:11.524: D/OpenGLRenderer(23796): Enabling debug mode 0 
02-28 18:16:13.054: E/SensorManager(23796): thread start 
02-28 18:16:13.054: D/SensorManager(23796): registerListener :: handle = 0 name= LSM330DLC 3-axis Accelerometer delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41cb53d8 
02-28 18:16:13.204: E/SpannableStringBuilder(23796): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 
02-28 18:16:13.204: E/SpannableStringBuilder(23796): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 
02-28 18:16:14.224: D/AndroidRuntime(23796): Shutting down VM 
02-28 18:16:14.224: W/dalvikvm(23796): threadid=1: thread exiting with uncaught exception (group=0x410122a0) 
02-28 18:16:14.229: E/AndroidRuntime(23796): FATAL EXCEPTION: main 
02-28 18:16:14.229: E/AndroidRuntime(23796): android.app.SuperNotCalledException: Fragment TimePickerFragment{41cc4718 #0 timePicker} did not call through to super.onAttach() 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:789) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.BackStackRecord.run(BackStackRecord.java:635) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.os.Handler.handleCallback(Handler.java:615) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.os.Handler.dispatchMessage(Handler.java:92) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.os.Looper.loop(Looper.java:137) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at android.app.ActivityThread.main(ActivityThread.java:4898) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at java.lang.reflect.Method.invokeNative(Native Method) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at java.lang.reflect.Method.invoke(Method.java:511) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 
02-28 18:16:14.229: E/AndroidRuntime(23796): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

嘗試添加到您的onAttach超級調用（）方法：

public void onAttach(Activity activity) { 
    super.onAttach(activity);