Ich versuche, das Youtube Player Support-Fragment in einem Fragment zu verwenden, aber die App stürzt immer ab (NullPointerException), und ich konnte keinen ähnlichen Beitrag finden, um ihn zu beheben.

Ich habe Import Import android.support.v4.app.Fragment damit das nicht das Problem sein sollte.

So sieht meine Fragmentklasse aus:

package com.example.activitydetector;
import com.google.android.youtube.player.YouTubeBaseActivity;
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 com.google.android.youtube.player.YouTubePlayerSupportFragment;
import com.google.android.youtube.player.YouTubePlayerView;
import systemManager.SystemManager;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class GuidelinesFragment extends YouTubePlayerSupportFragment {

    SystemManager sm;
    YouTubePlayerView youTubeView; 
    String URL_VIDEO = "CaA-k1l0xa4";
    String KEY_DEVELOPER = "AIzaSyBIIs0u0NXhsZguv8nCNvSzUmflTt7K1Ek";

    public GuidelinesFragment() {
        super();
        // TODO Auto-generated constructor stub
    }

    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);


    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.youtube, container, false);


        YouTubePlayerSupportFragment youTubePlayerSupportFragment = (YouTubePlayerSupportFragment) getFragmentManager().findFragmentById(R.id.youtubeplayerfragment);

        youTubePlayerSupportFragment.initialize(KEY_DEVELOPER, new OnInitializedListener() {

            @Override
            public void onInitializationSuccess(Provider arg0, YouTubePlayer arg1,
                    boolean arg2) {
                // TODO Auto-generated method stub
                arg1.cueVideo(URL_VIDEO);
            }

            @Override
            public void onInitializationFailure(Provider arg0,
                    YouTubeInitializationResult arg1) {
                // TODO Auto-generated method stub

            }
        });

        return view;
    }

}

Das ist mein ganz einfaches "Youtube" -Layout:

<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"
tools:context=".MainActivity" >

<fragment
    android:name="com.google.android.youtube.player.YouTubePlayerSupportFragment"
    android:id="@+id/youtubeplayerfragment"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

Und dies ist der Fehler, den das Protokoll anzeigt:

    11-30 16:33:56.419: W/dalvikvm(19375): threadid=1: thread exiting with uncaught exception (group=0x40f14258)
11-30 16:33:56.423: E/AndroidRuntime(19375): FATAL EXCEPTION: main
11-30 16:33:56.423: E/AndroidRuntime(19375): java.lang.NullPointerException
11-30 16:33:56.423: E/AndroidRuntime(19375):    at com.google.android.youtube.player.YouTubePlayerSupportFragment.onStart(Unknown Source)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.Fragment.performStart(Fragment.java:1484)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.os.Handler.handleCallback(Handler.java:605)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.os.Handler.dispatchMessage(Handler.java:92)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.os.Looper.loop(Looper.java:137)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at android.app.ActivityThread.main(ActivityThread.java:4645)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at java.lang.reflect.Method.invokeNative(Native Method)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at java.lang.reflect.Method.invoke(Method.java:511)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
11-30 16:33:56.423: E/AndroidRuntime(19375):    at dalvik.system.NativeStart.main(Native Method)

Jede Hilfe oder Andeutung wäre zutiefst dankbar. Ich habe schon rund 4 Stunden ohne Glück verschwendet.