YouTube Player crashes (java.lang.NullPointerException, null object reference)

问题

my YouTube Player crashes and I do not know why.

This is my Java Code: @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_youtube); Toolbar toolbar = (Toolbar) 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);
} }

Problem was solved

回答1:

Right now we need some additional information to definitively answer this question, but it appears that this line is returning null, which suggests that you want to take a look at your resource XML and make sure you're grabbing the fragment properly.

getSupportFragmentManager().findFragmentById(R.id.youtube_player_fragment);

You may benefit from taking a look at this related question:

findFragmentById return null

I suspect that the problem may be that in your resources XML, you're not declaring the fragment using the support library.

Try using:

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

回答2:

I tried a lot of these suggestions but none worked for me. I finally ended up creating a container and then replacing it at runtime with the YouTubeFragment. This worked perfectly fine for me.

Created a containerView in my layout file as, please note its just a part of my layout file

<View
    android:padding="10dp"
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@color/gray90"/>



<FrameLayout
    android:padding="20dp"
    android:id="@+id/youtubeContent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

Then I created an instance of the youtube fragment as below

youTubePlayerFragment = YouTubePlayerSupportFragment.newInstance();
I then replaced it using the standard way as below:-

FragmentManager manager = getFragmentManager(); FragmentTransaction transaction = manager.beginTransaction(); transaction.replace(R.id.youtubeContent,youTubePlayerFragment).commit();

I hope this helps others

来源：https://stackoverflow.com/questions/44269417/youtube-player-crashes-java-lang-nullpointerexception-null-object-reference

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