Youtube Android API NullPointerException Youtube片段错误

Question

基本上我试图创建YouTube片段。这个片段在任何List项被选中时显示。 我收到NullPointerExpection错误。不完全确定，我做错了什么。

的Youtube片段

import com.google.android.youtube.player.YouTubeInitializationResult; 
import com.google.android.youtube.player.YouTubePlayer; 
import com.google.android.youtube.player.YouTubePlayer.OnInitializedListener; 
import com.google.android.youtube.player.YouTubePlayer.Provider; 
import com.google.android.youtube.player.YouTubePlayerFragment; 
import android.app.Fragment; 
import android.app.FragmentManager; 
import android.app.FragmentTransaction; 
import android.content.Context; 

import com.google.android.youtube.player.YouTubePlayerView; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Toast; 


public class Youtube extends Fragment implements OnInitializedListener{ 
    public static final String API_KEY = "MyKey"; 
    public static final String VIDEO_ID = "o7VVHhK9zf0"; 

    /*public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.youtube_fragment); 
     YouTubePlayerFragment youTubePlayerFragment = (YouTubePlayerFragment) getActivity().getFragmentManager().findFragmentById(R.id.youtubeplayerfragment); 
      youTubePlayerFragment.initialize(API_KEY, this); 
     } 
*/ 
@Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
    YouTubePlayerFragment youTubePlayerFragment = (YouTubePlayerFragment) getActivity().getFragmentManager().findFragmentById(R.id.youtubeplayerfragment); 
     youTubePlayerFragment.initialize(API_KEY, this); 
    return inflater.inflate(R.layout.youtube_fragment, container, false); 
     } 

     private void setContentView(int youtubeFragment) { 
      //YouTubePlayerFragment youTubePlayerFragment = (YouTubePlayerFragment) getActivity().getFragmentManager().findFragmentById(R.id.youtubeplayerfragment); 
      // youTubePlayerFragment.initialize(API_KEY, this); 
       /*Fragment fragment = new YouTubePlayerFragment(); 
       FragmentManager fm = getActivity().getFragmentManager(); 
       FragmentTransaction ft = fm.beginTransaction(); 
       ft.replace(R.id.youtubeplayerfragment, fragment); 
       ft.addToBackStack(null); 
       ft.commit(); 

       YouTubePlayerFragment youtubeFrag = (YouTubePlayerFragment) fragment; 
       youtubeFrag.initialize(API_KEY, this);*/ 
     } 

     @Override 
     public void onInitializationFailure(Provider provider, 
      YouTubeInitializationResult result) { 
      Toast.makeText(getApplicationContext(), 
      "onInitializationFailure()", 
      Toast.LENGTH_LONG).show(); 
     } 

     private Context getApplicationContext() { 
      // TODO Auto-generated method stub 
      return null; 
     } 

     @Override 
     public void onInitializationSuccess(Provider provider, YouTubePlayer player, 
       boolean wasRestored) { 
       if (!wasRestored) { 
        player.cueVideo(VIDEO_ID); 
        } 
     } 

youtube_fragments.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".Youtube" > 

    <fragment 
     android:id="@+id/youtubeplayerfragment" 
     android:layout_width="match_parent" 
     android:layout_weight="0.02" 
     class="com.google.android.youtube.player.YouTubePlayerFragment" /> 

</LinearLayout> 

错误

03-18 14:57:36.470: E/AndroidRuntime(1339): FATAL EXCEPTION: main 
03-18 14:57:36.470: E/AndroidRuntime(1339): Process: com.example.actionbartab, PID: 1339 
03-18 14:57:36.470: E/AndroidRuntime(1339): java.lang.NullPointerException 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at com.example.actionbartab.Youtube.onCreateView(Youtube.java:36) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.Fragment.performCreateView(Fragment.java:1700) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.BackStackRecord.run(BackStackRecord.java:684) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.os.Handler.handleCallback(Handler.java:733) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.os.Handler.dispatchMessage(Handler.java:95) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.os.Looper.loop(Looper.java:136) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at java.lang.reflect.Method.invoke(Method.java:515) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
03-18 14:57:36.470: E/AndroidRuntime(1339):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你似乎在试图用一个YouTubePlayerView从一个片段。据我所知，这不是应该如何使用api（我不能这样工作）。

请使用YouTubeBaseActivity和YouTubePlayerView（无片段）或使用您的Activity类并包含YouTubePlayerFragment（请勿扩展它;请勿直接添加YouTubePlayerView）。

此相关的问题可能对您有用：NullPointerException on super.onStart()