java – android DialogFragment mDialog是null导致异常
发布时间：2020-12-15 02:19:19 所属栏目：Java 来源：网络整理
导读：我正在开发 android卡片游戏,我正在使用DialogFragment,我在其中呈现一些图像并告诉玩家对对手采取行动. 下面的一段代码被执行多次,完全没有错误,但是让我们说5到10次之后发生以下异常. E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.arabdealgame.a
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我正在开发
android卡片游戏,我正在使用DialogFragment,我在其中呈现一些图像并告诉玩家对对手采取行动.
下面的一段代码被执行多次,完全没有错误,但是让我们说5到10次之后发生以下异常. E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.arabdealgame.arabdealgame,PID: 8359
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Dialog.setOwnerActivity(android.app.Activity)' on a null object reference
at android.app.DialogFragment.onActivityCreated(DialogFragment.java:482)
at com.arabdealgame.activities.dialog.RentCardDialog.onActivityCreated(RentCardDialog.java:342)
at android.app.Fragment.performActivityCreated(Fragment.java:2362)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1014)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1171)
at android.app.BackStackRecord.run(BackStackRecord.java:815)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1578)
at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:563)
at com.arabdealgame.bo.Actions.RentActionCard$5.run(RentActionCard.java:315)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
上面的例外是告诉里面的 android.app.DialogFragment public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (!mShowsDialog) {
return;
}
View view = getView();
if (view != null) {
if (view.getParent() != null) {
throw new IllegalStateException("DialogFragment can not be attached to a container view");
}
mDialog.setContentView(view);
}
mDialog.setOwnerActivity(getActivity());
我从这里实例化对话框 boolean executePendingTransactions = fm.executePendingTransactions(); RentActionCard.java getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
MyLog.i(TAG,"run: --------------------------1");
FragmentManager fm = getActivity().getFragmentManager();
MyLog.i(TAG,"run: --------------------------2");
RentCardDialog rentCardDialog = new RentCardDialog();
MyLog.i(TAG,"run: --------------------------3");
if (!GameInfo.getCurrentPlayer().isUser()) {
MyLog.i(TAG,"run: --------------------------4");
rentCardDialog.setAgainstUser(true);
}
rentCardDialog.show(fm,"ccc");
boolean executePendingTransactions = fm.executePendingTransactions();
MyLog.d(TAG,"RentActionCard - executePendingTransactions : " + executePendingTransactions);
MyLog.i(TAG,"run: --------------------------5");
}
});
在我的对话框中,为了调试目的,已重写此方法 @Override
public void onActivityCreated(Bundle savedInstanceState) {
MyLog.i(TAG,"onActivityCreated: ----------------------------------");
super.onActivityCreated(savedInstanceState);
}
解决方法
执行以下操作不再显示此异常：
>我将所有组件声明为字段成员而非局部变量 public class RentCardDialog extends DialogFragment {
private static final String TAG = "RentCardDialog";
private TextView title1;
private TextView title2;
private TextView title1TxtView;
private TextView title2TxtView;
>然后只需在onCreateView中初始化它们,如下所示 @Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.dialog_rent_card,container,false);
title1 = (TextView) rootView.findViewById(R.id.rent_card_dialog_title1);
title2 = (TextView) rootView.findViewById(R.id.rent_card_dialog_title2);
title1TxtView = (TextView) rootView.findViewById(R.id.rent_card_dialog_title1);
title2TxtView = (TextView) rootView.findViewById(R.id.rent_card_dialog_title2);
>最后,我添加了我想要的任何片段,并在onActivityCreated中进行所有对话框组件构建,如下所示 @Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState); // Will now complete and not crash
try {
buildUserOptions();
MyLog.i(TAG,"onCreateView: ---------------------------3");
player2Fragment.setExecuteCallback(new CallbackInterface() {
@Override
public void execute() {
player2Fragment.refreshPlayerData(player2);
}
});
在对话框的业务工作进入onCreateView之前所以问题可能是某些组件没有真正加载但特别是片段因此它触发了该异常, 现在通过以下方式完成工作. （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |