在导航抽屉选项菜单上获取url string null

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我是android开发中的新手，我正在制作一个应用程序来显示不同类型的video.i有一个导航drawer，其中包含不同类型的选项，名为favorite video.when I点击我最喜欢的视频导航抽屉我试图展示我最喜欢的视频时出现意外错误。下面是收到的logcat的消息：在导航抽屉选项菜单上获取url string null

12-20 05:13:06.062: E/AndroidRuntime(1039): FATAL EXCEPTION: main 
12-20 05:13:06.062: E/AndroidRuntime(1039): java.lang.RuntimeException: Unable to start activity  ComponentInfo{com.dsnl.omygod/com.ebizzinfotech.MenuFragments.CustomPlayer}: java.lang.NullPointerException: uriString 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.os.Handler.dispatchMessage(Handler.java:99) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.os.Looper.loop(Looper.java:137) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at dalvik.system.NativeStart.main(Native Method) 
12-20 05:13:06.062: E/AndroidRuntime(1039): Caused by: java.lang.NullPointerException: uriString 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.net.Uri$StringUri.<init>(Uri.java:464) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.net.Uri$StringUri.<init>(Uri.java:454) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.net.Uri.parse(Uri.java:426) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at com.ebizzinfotech.MenuFragments.CustomPlayer.onCreate(CustomPlayer.java:58) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.Activity.performCreate(Activity.java:5008) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
12-20 05:13:06.062: E/AndroidRuntime(1039):  ... 11 more

下面是活动的代码。

@Override 
protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

    setContentView(R.layout.player); 

    Bundle b = getIntent().getExtras(); 
    VIDEO_ID = b.getString("VIDEO_URL"); 
    //Log.i("video id print",VIDEO_ID); 
    loading = (ProgressBar) findViewById(R.id.loading); 

    stop = (Button) findViewById(R.id.stop); 
    playtogglebutton = (ToggleButton) findViewById(R.id.playtogglebutton); 
    timeElapsed = (TextView) findViewById(R.id.timeElapsed); 
    timeEnd = (TextView) findViewById(R.id.timeEnd); 
    progressBar = (ProgressBar) findViewById(R.id.progressBar); 

    videoviewer = (VideoView) findViewById(R.id.videoviewer); 


    videoviewer.setVideoURI(Uri.parse(VIDEO_ID)); 

    videoviewer.requestFocus(); 
    videoviewer.setKeepScreenOn(true); 
    videoviewer.setOnErrorListener(this); 
    videoviewer.setOnPreparedListener(this); 

}

来源

2014-12-20 Divyang Patel

hmm 您是否激活了清单文件中的Internet权限？

如果不使用

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

更多信息

Post

来源

2014-12-20 05:48:52

是的，我正在使用互联网许可 –

空指针异常。

Caused by: java.lang.NullPointerException: uriString

检查的uriString

来源

2014-12-20 06:23:19

但我得到一个值uristring –

值检查的Uri.parse(VIDEO_ID)值。你可能会得到一些提示。

来源

2014-12-20 06:36:05

在导航抽屉选项菜单上获取url string null

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