java.lang.IllegalStateException:使用DialogFragment在onSaveInstanceState之后无法执行此操作

Question

我面临着DialogFragment/getSupportFragmentManager/Android版本4.x的问题

01-10 19:46:48.228: E/AndroidRuntime(9879): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1314)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1325)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:548)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:532)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.support.v4.app.DialogFragment.show(DialogFragment.java:127)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at com.v1.mypck.TermsAndConditions.showDialog(TermsAndConditions.java:256)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at com.v1.mypck.TermsAndConditions.handleMessage(TermsAndConditions.java:62)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at com.v1.mypck.TermsAndConditions$IncomingHandler.handleMessage(TermsAndConditions.java:53)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.os.Looper.loop(Looper.java:137)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at android.app.ActivityThread.main(ActivityThread.java:4441)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at java.lang.reflect.Method.invokeNative(Native Method)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at java.lang.reflect.Method.invoke(Method.java:511)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-10 19:46:48.228: E/AndroidRuntime(9879):     at dalvik.system.NativeStart.main(Native Method)

在下面的代码中,当我按下它时,它尝试完成当前活动并返回上一个活动,它会抛出错误.

代码适用于旧版本(4.x之前).

有人可以指导我正确的方向.

public class TermsAndConditions extends SherlockFragmentActivity implements LoaderManager.LoaderCallbacks<JSONObject>{
    static final String TAG = "TermsAndConditions";
    private static int titleResource;
    private static int messageResource;

    private IncomingHandler handler = null;
    private static final int SHOW_NETWORK_DIALOG = 3;

    static class IncomingHandler extends Handler {
        private final WeakReference<TermsAndConditions> mTarget; 

        IncomingHandler(TermsAndConditions target) {
            mTarget = new WeakReference<TermsAndConditions>(target);
        }

        @Override
        public void handleMessage(Message msg) {
            TermsAndConditions target = mTarget.get();
            if (target != null) {
                target.handleMessage(msg);
            }
        }
    }
    public void handleMessage(Message msg) {
        switch (msg.what)  {
            case SHOW_NETWORK_DIALOG:
                titleResource = R.string.msg_alert_no_network_title;
                messageResource = R.string.msg_alert_no_network_message;
                showDialog();
                break;
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.web_view);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportLoaderManager().initLoader(0, null, this);
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
    private void loadViewData() {
        //Logic to load content.
    }

    @Override
    public Loader<JSONObject> onCreateLoader(int arg0, Bundle arg1) {
        if (handler == null){
            handler = new IncomingHandler(TermsAndConditions.this);
        }
        return new JsonLoader(this);
    }

    @Override
    public void onLoadFinished(Loader<JSONObject> arg0, JSONObject jsonData) {
        if(jsonDataObject==null || jsonDataObject.length()==0) {
            handler.sendEmptyMessage(SHOW_NETWORK_DIALOG);
        } else {
            loadViewData();
        }
    }

    @Override
    public void onLoaderReset(Loader<JSONObject> arg0) {
        if(jsonDataObject==null || jsonDataObject.length()==0) {
            handler.sendEmptyMessage(SHOW_NETWORK_DIALOG);
        } else {
            loadViewData();
        }
    }

    public static class JsonLoader extends AsyncTaskLoader<JSONObject> {
        public JsonLoader(Context context) {
            super(context);
        }

        @Override 
        protected void onStartLoading() {
            if (jsonDataObject != null) {
                deliverResult(jsonDataObject);
            }
            if (takeContentChanged() || jsonDataObject == null) {
                forceLoad();
            }
        }

        @Override
        public JSONObject loadInBackground() {
            try {
                return response.getJSONObject("result");
            } catch (JSONException e) {
                return null;
            } catch (Throwable e) {
                return null;
            }
        }

        @Override 
        public void deliverResult(JSONObject newJsonData) {
            if (isReset()) {
                if (jsonDataObject != null) {
                    onReleaseResources(jsonDataObject);
                }
            }
            JSONObject oldData = jsonDataObject;
            jsonDataObject = newJsonData;
            if (isStarted()) {
                super.deliverResult(jsonDataObject);
            }
            if (oldData != null) {
                onReleaseResources(oldData);
            }
        }

        @Override 
        protected void onStopLoading() {
            cancelLoad();
        }

        @Override public void onCanceled(JSONObject jsonData) {
            super.onCanceled(jsonData);
            onReleaseResources(jsonData);
        }

        @Override protected void onReset() {
            super.onReset();
            onStopLoading();
            if (jsonDataObject != null) {
                onReleaseResources(jsonDataObject);
                jsonDataObject = null;
            }
        }

        protected void onReleaseResources(JSONObject jsonData) {
            jsonData = null;
        }
    }
    public static class MyAlertDialogFragment extends DialogFragment {
        public static MyAlertDialogFragment newInstance(int title) {
            MyAlertDialogFragment frag = new MyAlertDialogFragment();
            Bundle args = new Bundle();
            args.putInt("title", title);
            frag.setArguments(args);
            return frag;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            int title = getArguments().getInt("title");
            return new AlertDialog.Builder(getActivity())
                    .setTitle(title)
                    .setMessage(messageResource)
                    .setPositiveButton(R.string.alert_dialog_ok,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {

                            }
                        }
                    )
                    .create();
        }
    }
    public void showDialog() {
        DialogFragment newFragment = MyAlertDialogFragment.newInstance(titleResource);
        newFragment.show(getSupportFragmentManager(), "my_dialog");
    }
}

Answer 1

以下是另一个帖子中的答案:

onActivityResult中的操作和"错误无法在onSaveInstanceState之后执行此操作"

也在这里:

刷新我的片段不像我想的那样工作

这是解决此问题的示例:

DialogFragment loadingDialog = createDialog();

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                    transaction.add(loadingDialog, "loading");
                    transaction.commitAllowingStateLoss();  

Answer 2

我遇到了同样的问题,我改变了代码如下

newFragment.show(transactionFragment, "dialog");

至:

transactionFragment.add(android.R.id.content, newFragment).addToBackStack(null).commitAllowingStateLoss();

完成的代码对我来说效果不错,希望有所帮助

FragmentTransaction transactionFragment = getActivity().getSupportFragmentManager().beginTransaction();
    DialogPageListFragment newFragment = new DialogPageListFragment();
    transactionFragment.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
    newFragment.setArguments(extras);
    transactionFragment.add(android.R.id.content, newFragment).addToBackStack(null).commitAllowingStateLoss();

Answer 3

可能是，响应HandleMessage的处理程序与已破坏的活动相关联。

例如：如果旋转屏幕，旧的被破坏的活动将处理该消息，然后您将调用showDialog，并且将引发异常：

在旧的销毁活动调用他的onSaveInstanceState之后，您将创建一个对话框。

尝试用新创建的活动替换回调，以确保始终在活动活动中创建对话框。

如果您不旋转，请在onSaveInstance上放置一个标记（例如“ saving”），然后在onRestoreInstance上将其禁用。在您的handleMessage方法中，如果打开了“保存”标志，则不显示对话框，只需打开另一个标志，表明必须在onResume上创建对话框。然后在onResume方法上，检查是否在该过程的中间，应该创建对话框，如果是，则在onResume方法上显示该对话框。