Android:DialogFragment.dismissAternal在DialogFragment.dismissInternal的NullPointerException

显示ProgressDialog时崩溃应用程序。 我正在使用滑出式键盘在手机上进行测试。 当显示对话框时,我滑动键盘和应用程序崩溃。

public static class ProgressDialogFragment extends DialogFragment { public ProgressDialogFragment() { super(); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { final ProgressDialog dialog = new ProgressDialog(getActivity()); dialog.setMessage(getString(R.string.dlg_progress_title)); dialog.setIndeterminate(true); dialog.setCancelable(false); return dialog; } @Override public void show(FragmentManager manager, String tag) { try { super.show(manager, tag); } catch (IllegalStateException e) { Log.d(TAG, e.getMessage()); } } } 

崩溃日志:

 > 04-25 20:49:46.999: E/AndroidRuntime(7904): FATAL EXCEPTION: main 04-25 20:49:46.999: E/AndroidRuntime(7904): java.lang.NullPointerException 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:184) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.support.v4.app.DialogFragment.dismissAllowingStateLoss(DialogFragment.java:165) 04-25 20:49:46.999: E/AndroidRuntime(7904): at com.fisherman.activity.HomeActivity$2.onPostExecute(HomeActivity.java:268) 04-25 20:49:46.999: E/AndroidRuntime(7904): at com.fisherman.activity.HomeActivity$2.onPostExecute(HomeActivity.java:1) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.os.AsyncTask.finish(AsyncTask.java:417) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.os.AsyncTask.access$300(AsyncTask.java:127) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.os.Handler.dispatchMessage(Handler.java:99) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.os.Looper.loop(Looper.java:130) 04-25 20:49:46.999: E/AndroidRuntime(7904): at android.app.ActivityThread.main(ActivityThread.java:3835) 04-25 20:49:46.999: E/AndroidRuntime(7904): at java.lang.reflect.Method.invokeNative(Native Method) 04-25 20:49:46.999: E/AndroidRuntime(7904): at java.lang.reflect.Method.invoke(Method.java:507) 04-25 20:49:46.999: E/AndroidRuntime(7904): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) 04-25 20:49:46.999: E/AndroidRuntime(7904): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622) 04-25 20:49:46.999: E/AndroidRuntime(7904): at dalvik.system.NativeStart.main(Native Method) 

我已经完成了类,因为应用程序崩溃:

 > 04-25 20:48:50.757: E/AndroidRuntime(7863): Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.fisherman.activity.HomeActivity$ProgressDialogFragment: make sure class name exists, is public, and has an empty constructor that is public 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.support.v4.app.Fragment.instantiate(Fragment.java:405) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.support.v4.app.FragmentState.instantiate(Fragment.java:97) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1767) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:208) 04-25 20:48:50.757: E/AndroidRuntime(7863): at com.fisherman.activity.HomeActivity.onCreate(HomeActivity.java:50) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722) 04-25 20:48:50.757: E/AndroidRuntime(7863): ... 12 more 04-25 20:48:50.757: E/AndroidRuntime(7863): Caused by: java.lang.InstantiationException: com.fisherman.activity.HomeActivity$ProgressDialogFragment 04-25 20:48:50.757: E/AndroidRuntime(7863): at java.lang.Class.newInstanceImpl(Native Method) 04-25 20:48:50.757: E/AndroidRuntime(7863): at java.lang.Class.newInstance(Class.java:1409) 04-25 20:48:50.757: E/AndroidRuntime(7863): at android.support.v4.app.Fragment.instantiate(Fragment.java:394) 

你有关于postexecute的对话吗? 它可能会创建应用程序崩溃所以如果你忘了解雇对话,请在postexecute上解雇它。

HomeActivity $ 2.onPostExecute(HomeActivity.java:268)

你在异步中调用对话框吗?