当我尝试解雇一个片段对话,我的应用程序有时会崩溃。 这里的日志:
Process: com.xxx, PID: 9981
java.lang.RuntimeException: Error receiving broadcast Intent { act=xxxx flg=0x10 (has extras) } in xxxxxx
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:893)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5438)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference
at android.app.DialogFragment.dismissInternal(DialogFragment.java:296)
at android.app.DialogFragment.dismissAllowingStateLoss(DialogFragment.java:277)
at xxxxx.updateStatus(BaseAppCompatActivity.java:96)
at xxxxx.access$000(BaseAppCompatActivity.java:43)
at xxxxx$1.onReceive(BaseAppCompatActivity.java:79)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:883)
xxxxx.updateStatus(BaseAppCompatActivity.java:96) 此行试图驳回DialogFragment:
mDialogFragment.dismissAllowingStateLoss();
一个DialogFragment是在我的活动。
private SimpleBlockedDialogFragment mDialogFragment = SimpleBlockedDialogFragment.newInstance();
所以mDialogFragment不为空。
我告诉像这样的对话:
FragmentTransaction ft = getFragmentManager().beginTransaction();
mDialogFragment.updateMessage("xxx");
mDialogFragment.show(ft, "block_dialog");
并关闭对话框如下:
mDialogFragment.dismissAllowingStateLoss();
有时候,我会告诉对话框只有一次,但驳回了不止一次。但我不认为导致崩溃。
下面是在DialogFragment的dismissInternal功能:
void dismissInternal(boolean allowStateLoss) {
if (mDismissed) {
return;
}
mDismissed = true;
mShownByMe = false;
if (mDialog != null) {
mDialog.dismiss();
mDialog = null;
}
mViewDestroyed = true;
if (mBackStackId >= 0) {
getFragmentManager().popBackStack(mBackStackId,
FragmentManager.POP_BACK_STACK_INCLUSIVE);
mBackStackId = -1;
} else {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.remove(this);
if (allowStateLoss) {
ft.commitAllowingStateLoss();
} else {
ft.commit();
}
}
}
日志告诉我,getFragmentManager()返回null。我不知道为什么会这样。 如何正确驳回FragmentDialog?
更新: 我尝试android.support.v4.app.FragmentTransaction,而且还得到一个异常。
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:196)
at android.support.v4.app.DialogFragment.dismissAllowingStateLoss(DialogFragment.java:177)
帮助〜
尝试getSupportFragmentManager().beginTransaction();
这可能会有帮助。