Android Youtube Api nullPointException

Question

我開發的android youtube api.i成功創建了youtube api項目，並且我可以在活動開始時播放youtube視頻。現在我想播放視頻只在按鈕click.i有nullpointexception 這是我的代碼

public class MainActivity extends YouTubeBaseActivity implements 
    YouTubePlayer.OnInitializedListener { 

static private final String DEVELOPER_KEY = "************"; 
static private final String VIDEO = "hjHnWz3EyHs"; 
private Button b1; 
private YouTubePlayer player; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    YouTubePlayerView youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view); 
    b1 = (Button) findViewById(R.id.button1); 
    youTubeView.initialize(DEVELOPER_KEY, this); 

    b1.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      player.loadVideo(VIDEO, 36000); //error is in this line 


     } 
    }); 
} 

@Override 
public void onInitializationFailure(Provider provider, 
     YouTubeInitializationResult error) { 
    Toast.makeText(this, "Oh no! " + error.toString(), Toast.LENGTH_LONG) 
      .show(); 
} 

@Override 
public void onInitializationSuccess(Provider provider, 
     YouTubePlayer player, boolean wasRestored) { 
    //player.loadVideo(VIDEO, 36000); 
} 

} 什麼是錯的？如果有人知道解決方案，請幫助我 謝謝

Answer 1

您還沒有初始化player。您只聲明private YouTubePlayer player;。

您可以檢查樣品@

https://developers.google.com/youtube/android/player/sample-applications

Answer 2

你缺少player初始化在onInitializationSuccess方法，它應該是如下：

@Override 
public void onInitializationSuccess(Provider provider, 
    YouTubePlayer player, boolean wasRestored) { 
    MainActivity.this.player = player; 
    //do other stuff like customizing player 
} 

也請看一看樣品文件夾here