问题描述
我有一个正确的对话片段解雇问题的方向被改变了。该活动是重建我想这是因为旧的上下文，因为那里后创建一个新的活动和相应的上下文。我知道我可以设置一些onSaveInstance变量保存对话框的状态并重新如果它`必要的对话，或者只是把一个属性清单中方向。但是，也许，有什么更好的办法把它做并不难code将其清单中，而不是在onSaveIntance手动保存？我也尝试在这两个主要片段和对话片段使用setRetainInstance，但它并不能帮助我。
I have a problem with correct dialog fragment dismissing after that orientation was changed. I guess that's due to old context because after that activity was recreated there was created a new activity and corresponding context. I know that I can set some variable in onSaveInstance to save dialog status and recreate dialog if it`s necessary, or just put one attribute in manifest "orientation". But, maybe, there is something better way to do it to not hardcode it in manifest and not save in onSaveIntance manually? I also tried to use setRetainInstance in both main fragment and dialog fragment but it doesn't help me.
片段：
public class MainFragment extends Fragment implements ServiceExecutorListener, OnClickListener, DialogClickListener {
private static final String TAG = MainFragment.class.getName();
private TextView serviceStatus;
Intent intent;
Boolean bound = false;
ServiceConnection sConn;
RESTService service;
ProgressDialogFragment pd;
private Button btnSend, btnCheck;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate");
setRetainInstance(true);
intent = new Intent(getActivity(), RESTService.class);
getActivity().startService(intent);
sConn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
Log.d(TAG, "MainFragment onServiceConnected");
service = ((RESTService.MyBinder) binder).getService();
service.registerListener(MainFragment.this);
if (service.tasksAreDone())
serviceStatus.setText(service.getResult());
bound = true;
}
public void onServiceDisconnected(ComponentName name) {
Log.d(TAG, "MainFragment onServiceDisconnected");
bound = false;
}
};
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.main_fragment, container, false);
serviceStatus = (TextView) rootView.findViewById(R.id.tvServiceStatusValue);
btnSend = (Button) rootView.findViewById(R.id.btnSend);
btnCheck = (Button) rootView.findViewById(R.id.btnCheck);
btnSend.setOnClickListener(this);
btnCheck.setOnClickListener(this);
return rootView;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnSend:
pd = new ProgressDialogFragment();
pd.newInstance(null);
pd.setDialogClickListener(this);
pd.show(getActivity().getSupportFragmentManager(), "ProgressDialog");
service.run(RESTService.REQUEST, 7);
service.run(RESTService.REQUEST, 2);
service.run(RESTService.REQUEST, 4);
break;
case R.id.btnCheck:
if (service != null)
serviceStatus.setText(String.valueOf(service.tasksAreDone()) + service.getTasksCount());
break;
}
}
@Override
public void onStart() {
super.onStart();
Log.d(TAG, "onStart: Bind service");
getActivity().bindService(intent, sConn, 0);
}
@Override
public void onPause() {
super.onPause();
Log.d(TAG, "onPause: Unbind service");
if (!bound)
return;
getActivity().unbindService(sConn);
service.unregisterListener();
bound = false;
}
@Override
public void onComplete(int taskID, int action, String result) {
Log.d(TAG, "Task #" + taskID + ", action = " + action + " Completed");
pd.dismiss();
serviceStatus.setText(result);
}
@Override
public void onDialogClick(int action) {
switch (action) {
case Dialog.BUTTON_POSITIVE:
Log.d(TAG, "POSITIVE BUTTON");
break;
case Dialog.BUTTON_NEGATIVE:
Log.d(TAG, "NEGATIVE BUTTON");
service.removeTasks();
break;
case Dialog.BUTTON_NEUTRAL:
Log.d(TAG, "NEUTRAL BUTTON");
break;
}
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
}
}
对话框：
public class ProgressDialogFragment extends DialogFragment implements OnClickListener {
final String TAG = ProgressDialogFragment.class.getName();
private DialogClickListener listener;
public ProgressDialogFragment newInstance(Bundle args) {
ProgressDialogFragment pdf = new ProgressDialogFragment();
pdf.setArguments(args);
return pdf;
}
public void setDialogClickListener(DialogClickListener listener) {
this.listener = listener;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
Log.d(TAG, "onCreate");
}
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder adb = new AlertDialog.Builder(getActivity())
.setTitle("Title!")
.setPositiveButton(R.string.yes, this)
.setNegativeButton(R.string.no, this)
.setNeutralButton(R.string.maybe, this)
.setCancelable(false)
.setMessage(R.string.message_text)
.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
return true;
}
});
return adb.create();
}
public void onClick(DialogInterface dialog, int which) {
if (listener != null)
listener.onDialogClick(which);
}
public void onDismiss(DialogInterface dialog) {
Log.d(TAG, "Dialog: onDismiss, dialog = " + getDialog() + ", retainInstance = " + getRetainInstance());
// Fix to avoid simple dialog dismiss in orientation change
if ((getDialog() != null) && getRetainInstance())
getDialog().setDismissMessage(null);
}
public void onCancel(DialogInterface dialog) {
super.onCancel(dialog);
Log.d(TAG, "Dialog: onCancel");
}
logcat的：
LOgCat:
04-29 06:17:17.860: E/AndroidRuntime(4202): FATAL EXCEPTION: main
04-29 06:17:17.860: E/AndroidRuntime(4202): java.lang.NullPointerException
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:184)
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.support.v4.app.DialogFragment.dismiss(DialogFragment.java:155)
04-29 06:17:17.860: E/AndroidRuntime(4202): at com.example.restservice.fragments.MainFragment.onComplete(MainFragment.java:108)
04-29 06:17:17.860: E/AndroidRuntime(4202): at com.example.restservice.service.RESTService$1.run(RESTService.java:79)
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.os.Handler.handleCallback(Handler.java:605)
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.os.Handler.dispatchMessage(Handler.java:92)
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.os.Looper.loop(Looper.java:137)
04-29 06:17:17.860: E/AndroidRuntime(4202): at android.app.ActivityThread.main(ActivityThread.java:4514)
04-29 06:17:17.860: E/AndroidRuntime(4202): at java.lang.reflect.Method.invokeNative(Native Method)
04-29 06:17:17.860: E/AndroidRuntime(4202): at java.lang.reflect.Method.invoke(Method.java:511)
04-29 06:17:17.860: E/AndroidRuntime(4202): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
04-29 06:17:17.860: E/AndroidRuntime(4202): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
04-29 06:17:17.860: E/AndroidRuntime(4202): at dalvik.system.NativeStart.main(Native Method)
编辑：
如果我把setRetainInstance（真），其中要求dialogFragment主要片段和DialogFragment在onCreate方法才把我看到getRetainInstance返回true和getDialog有对象定向变化（否则NPE）的过程。在这种情况下，我也不有NPE但会有以下异常行为：对话框创建presented，对话重建（方向更改），并驳回，对话重建（再次取向改变）和$ P $（为什么？） psented（WTF？上一次被辞退）等即对话框驳回一面，但请记住，在另一侧应该是presented。那是什么？
If I put setRetainInstance(true) in main fragment which calls dialogFragment and in DialogFragment in onCreate method only then I see that getRetainInstance return true and getDialog has object in the process of orientation change(otherwise NPE). In this case I also don`t have NPE BUT there will be following strange behaviour: dialog created and presented, dialog recreated(orientation change) and dismissed(why?), dialog recreated(again orientation changed) and presented(wtf? last time it was dismissed) and so on i.e dialog dismissed on one side but remember that on another side it should be presented. What is that?
推荐答案
删除 setRetainInstance（真）; 从 onCreateDialog（捆绑savedInstanceState）并保持它在的onCreate（捆绑savedInstance）如下：
Remove the setRetainInstance(true); from onCreateDialog(Bundle savedInstanceState) and keep it in onCreate(Bundle savedInstance) as follows :
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
这篇关于安卓：为什么DialogFragment返回空指针的方向改变的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！