有时,如果未显式调用,可能会发生此错误startActivity(...)
。例如,某些人可能在Crashlytics中看到了这样的堆栈跟踪:
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)
您可能想知道自己做错了什么,因为跟踪仅包含框架代码。好吧,这是一个如何发生这种情况的例子。假设我们处于碎片之中。
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!!
现在,当用户单击该文本视图时,您的应用将因上面的堆栈跟踪而崩溃。这是因为布局填充器具有对应用程序上下文的引用,因此您的文本视图具有应用程序上下文。单击该文本视图会隐式调用appContext.startActivity(...)
。
最后说明:我在Android 4、5、6和7设备上对此进行了测试。它只会影响4、5和6。Android7设备显然没有问题appContext.startActivity(...)
。
我希望这可以帮助其他人!