java - YouTube Player崩溃(java.lang.NullPointerException，空对象引用)

Question

我的YouTube播放器崩溃了，我不知道为什么。

这是我的Java代码:
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_youtube);
工具栏工具栏=(工具栏)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);


    playerFragment = (YouTubePlayerSupportFragment) getSupportFragmentManager().findFragmentById(R.id.youtube_player_fragment);
    playerFragment.initialize(YouTubeKey, this);
}



@Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
    mPlayer = youTubePlayer;

    //Enables automatic control of orientation
    mPlayer.setFullscreenControlFlags(YouTubePlayer.FULLSCREEN_FLAG_CONTROL_ORIENTATION);

    //Show full screen in landscape mode always
    mPlayer.addFullscreenControlFlag(YouTubePlayer.FULLSCREEN_FLAG_ALWAYS_FULLSCREEN_IN_LANDSCAPE);

    //System controls will appear automatically
    mPlayer.addFullscreenControlFlag(YouTubePlayer.FULLSCREEN_FLAG_CONTROL_SYSTEM_UI); 

    if (!b) {
        mPlayer.cueVideo("xxx");
        mPlayer.loadVideo("xxx");
    }
    else
    {
        mPlayer.play();
    }
}

@Override
public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {
    mPlayer = null;
    String ausgabe = youTubeInitializationResult.toString();
    Log.d("hi", ausgabe);
} }

问题解决了

Answer 1

现在，我们需要一些其他信息来明确地回答这个问题，但是看来该行返回的是null，这表明您希望查看资源XML并确保正确抓取了该片段。
getSupportFragmentManager().findFragmentById(R.id.youtube_player_fragment);
您可能会受益于以下相关问题:

findFragmentById return null

我怀疑问题可能出在您的资源XML中，您没有使用支持库声明该片段。

尝试使用:

<fragment
  android:name="com.google.android.youtube.player.YouTubePlayerSupportFragment"