[英]NullPointerException but don't understand why
我有一个DialogFragment
,应该显示一个VideoView
和一些TextViews
。 但是,即使布局夸大了, VideoView
以及其他控件也为null。
这是我检索指向各种控件的指针的代码:
@Override
public void onViewCreated (View view, Bundle savedInstanceState) {
controls = new MediaController(getActivity());
title = (TextView) view.findViewById(R.id.title);
date = (TextView) view.findViewById(R.id.date);
description = (TextView) view.findViewById(R.id.description);
video = (VideoView) view.findViewById(R.id.video);
controls.setAnchorView(video);
video.setMediaController(controls);
}
但是,调试器则相反:
为什么它们为空? 我在定义它们的创建视图中放大了布局。
堆栈跟踪:
08-04 06:19:07.804: E/AndroidRuntime(1758): FATAL EXCEPTION: main
08-04 06:19:07.804: E/AndroidRuntime(1758): java.lang.NullPointerException
08-04 06:19:07.804: E/AndroidRuntime(1758): at com.example.tqafragments.VideoDialog.showNewVideo(VideoDialog.java:61)
08-04 06:19:07.804: E/AndroidRuntime(1758): at com.example.tqafragments.MainActivity.feedItemSelected(MainActivity.java:36)
08-04 06:19:07.804: E/AndroidRuntime(1758): at com.example.tqafragments.FeedFragment$2.onItemClick(FeedFragment.java:73)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.widget.AbsListView$1.run(AbsListView.java:3423)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.os.Handler.handleCallback(Handler.java:725)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.os.Handler.dispatchMessage(Handler.java:92)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.os.Looper.loop(Looper.java:137)
08-04 06:19:07.804: E/AndroidRuntime(1758): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-04 06:19:07.804: E/AndroidRuntime(1758): at java.lang.reflect.Method.invokeNative(Native Method)
08-04 06:19:07.804: E/AndroidRuntime(1758): at java.lang.reflect.Method.invoke(Method.java:511)
08-04 06:19:07.804: E/AndroidRuntime(1758): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-04 06:19:07.804: E/AndroidRuntime(1758): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-04 06:19:07.804: E/AndroidRuntime(1758): at dalvik.system.NativeStart.main(Native Method)
ShowNewVideo:
public void showNewVideo(Feed f){
title.setText(f.getTitle());
date.setText(f.getDate());
description.setText(Html.fromHtml(f.getDescription()));
video.setVideoURI(Uri.parse(f.getVideoURL())); // Line 61
video.start();
}
你需要一些改变
把你的代码
title = (TextView) view.findViewById(R.id.title);
date = (TextView) view.findViewById(R.id.date);
description = (TextView) view.findViewById(R.id.description);
video = (VideoView) view.findViewById(R.id.video);
从onViewCreated()到onCreateView(),然后在onViewCreated()方法上绑定数据。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.