A volte questo errore può verificarsi senza una chiamata esplicita a startActivity(...)
. Ad esempio, alcuni di voi potrebbero aver visto una traccia dello stack come questa in Crashlytics:
Fatal Exception: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
at android.app.ContextImpl.startActivity(ContextImpl.java:1597)
at android.app.ContextImpl.startActivity(ContextImpl.java:1584)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:337)
at android.text.style.URLSpan.onClick(URLSpan.java:62)
at android.text.method.LinkMovementMethod.onTouchEvent(LinkMovementMethod.java:217)
at android.widget.TextView.onTouchEvent(TextView.java:9522)
at android.view.View.dispatchTouchEvent(View.java:8968)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.widget.AbsListView.dispatchTouchEvent(AbsListView.java:5303)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2709)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2425)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2559)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1767)
at android.app.Activity.dispatchTouchEvent(Activity.java:2866)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:67)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:67)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2520)
at android.view.View.dispatchPointerEvent(View.java:9173)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4706)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4544)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4068)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4121)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4087)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4201)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4095)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4258)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4068)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4121)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4087)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4095)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4068)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6564)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6454)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6425)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6654)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
at android.os.MessageQueue.next(MessageQueue.java:143)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Method.java)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
E potresti chiederti cosa hai fatto di sbagliato, poiché la traccia include solo il codice del framework. Bene, ecco un esempio di come ciò possa accadere. Diciamo che siamo in un frammento.
Activity activity = getActivity();
Context activityContext = activity;
Context appContext = activityContext.getApplicationContext();
LayoutInflater inflater = LayoutInflater.from(appContext); // whoops!
View view = inflater.inflate(R.layout.some_layout, parent, false);
TextView tvWithLinks = (TextView) view.findViewById(R.id.tv_with_links);
tvWithLinks.setMovementMethod(LinkMovementMethod.getInstance()); // whoops!!
Ora, quando un utente fa clic su quella vista di testo, l'app si arresta in modo anomalo con la traccia dello stack sopra. Questo perché il gonfiatore del layout ha un riferimento al contesto dell'applicazione , quindi la vista di testo ha un contesto dell'applicazione. Cliccando su quella vista di testo si chiama implicitamenteappContext.startActivity(...)
.
Nota finale: l'ho testato su dispositivi Android 4, 5, 6 e 7. Colpisce solo 4, 5 e 6. Apparentemente i dispositivi Android 7 non hanno problemi a chiamare appContext.startActivity(...)
.
Spero che questo aiuti qualcun'altro!