java.lang.IllegalStateException: 在 onSaveInstanceState 和 DialogFragment 之后无法执行此操作 [英] java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState with DialogFragment
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问题描述
我遇到了 DialogFragment/getSupportFragmentManager/Android 4.x 版的问题
I am facing issue with DialogFragment / getSupportFragmentManager / Android version 4.x
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，当我按回时，它会尝试完成当前活动并返回到前一个活动，它会引发上述错误.
In below code when i press back it tries to finish current activity and go back to previous activity it throws above error.
代码在旧版本(4.x 之前)上运行良好.
Code works well on older version (prior to 4.x).
有人可以指导我朝着正确的方向前进.
Can somebody guide me in right direction.
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");
}
}
推荐答案
这是另一个帖子的答案:
Here is the answer in another thread:
onActivityResult 和 " 中的操作;错误 OnSaveInstanceState 后无法执行此操作"
也在这里:
这是解决此问题的示例:
This is an example solving this problem:
DialogFragment loadingDialog = createDialog();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(loadingDialog, "loading");
transaction.commitAllowingStateLoss();
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