问题
Im trying to use the Youtube Player Support Fragment in a fragment but the app always crash (NullPointerException) and I have not been able to find any similar post to fix it.
I have import import android.support.v4.app.Fragment so that should not be the problem.
This is how my fragment class looks like:
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;
}
}
This is my totally and simple "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"/>
And this is the error that the log shows:
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)
ANY help or hint would be deeply grateful. I have already wasted around 4 hours without luck.
回答1:
I ran into this problem before and I believe the issue stemmed from trying to inflate the YouTubePlayerSupportFragment layout. I solved my issue by creating a fragment like this:
public class PlayerYouTubeFrag extends YouTubePlayerSupportFragment {
private String currentVideoID = "video_id";
private YouTubePlayer activePlayer;
public static PlayerYouTubeFrag newInstance(String url) {
PlayerYouTubeFrag playerYouTubeFrag = new PlayerYouTubeFrag();
Bundle bundle = new Bundle();
bundle.putString("url", url);
playerYouTubeFrag.setArguments(bundle);
return playerYouTubeFrag;
}
private void init() {
initialize(DeveloperKey.DEVELOPER_KEY, new OnInitializedListener() {
@Override
public void onInitializationFailure(Provider arg0, YouTubeInitializationResult arg1) {
}
@Override
public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
activePlayer = player;
activePlayer.setPlayerStyle(YouTubePlayer.PlayerStyle.DEFAULT);
if (!wasRestored) {
activePlayer.loadVideo(getArguments().getString("url"), 0);
}
}
});
}
@Override
public void onYouTubeVideoPaused() {
activePlayer.pause();
}
}
And then call an instance of the fragment like this:
PlayerYouTubeFrag myFragment = PlayerYouTubeFrag.newInstance("video_id");
getSupportFragmentManager().beginTransaction().replace(R.id.video_container, myFragment).commit();
Where video_container in my case was an empty frame layout.
回答2:
CzarMatt nailed it. Just to add to his answer though, don't forget you need to call the init() method. To do so follow CzarMatt's code and add one line:
public static PlayerYouTubeFrag newInstance(String url) {
PlayerYouTubeFrag playerYouTubeFrag = new PlayerYouTubeFrag();
Bundle bundle = new Bundle();
bundle.putString("url", url);
playerYouTubeFrag.setArguments(bundle);
playerYouTubeFrag.init(); //This line right here
return playerYouTubeFrag;
}
Also, since I'm sure people will run into the same issue I did, even though CzarMatt mentioned it above, just to reiterate, when you pass in a URL for the video, you are NOT passing in the youtube URL
That is, with: "youtube.com/watch?v=z7PYqhABiSo&feature=youtu.be"
You are passing in only the video ID
I.e. use: "z7PYqhABiSo"
Since it is Google's own documentation, it knows how to play it just fine with the id.
来源：https://stackoverflow.com/questions/20302110/struggling-with-youtube-player-support-fragment