android - How to use youtube API? -

my class:

             public class mainactivity_for_youtube extend youtubebaseactivity implements youtubeplayer.oninitializedlistener {  private static final int recovery_dialog_request = 1; private youtubeplayerview playerview; string fbid="";  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      // called modify window feature , resize full screen     requestwindowfeature(window.feature_no_title);      getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,             windowmanager.layoutparams.flag_fullscreen);      setcontentview(r.layout.youtubevideo);       fbid = getintent().getstringextra("urls");      playerview = (youtubeplayerview) findviewbyid(r.id.player_view);      // initializes youtube player view     playerview.initialize(config.api_key, this); }   // called when youtube player initialization failed @override public void oninitializationfailure(youtubeplayer.provider provider,                                     youtubeinitializationresult errorresult) {      // shows dialog if user interaction may fix error     if (errorresult.isuserrecoverableerror()) {         errorresult.geterrordialog(this, recovery_dialog_request).show();     }     else {         // displays error occured during initialization         string error = string.format(                 getstring(r.string.error_string), errorresult.tostring());         toast.maketext(this, error, toast.length_long).show();     } }   /**  * called when initialization of player successful  * @param provider provider used initialize player  * @param player player instance used control video playback  * @param wasrestored depicts whether video restored previous  *                    state. returns true if video resumed last  *                    paused state, else returns false  */ @override public void oninitializationsuccess(youtubeplayer.provider provider,                                     youtubeplayer player, boolean wasrestored) {     if (!wasrestored) {          player.cuevideo("_oea18y8gm0");         player.setplayerstyle(playerstyle.default);     } }    @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     if (requestcode == recovery_dialog_request) {          // initializes youtube player view         getyoutubeplayerprovider().initialize(config.api_key, this);     } }   // returns player view defined in xml file private youtubeplayer.provider getyoutubeplayerprovider() {     return (youtubeplayerview) findviewbyid(r.id.player_view); }   /**  *   */ private final class eventlistener implements youtubeplayer.playbackeventlistener {       /**      * called when video starts playing      */     @override     public void onplaying() {         log.e("status", "playing");     }       /**      * called when video stops playing      */     @override     public void onpaused() {         log.e("status", "paused");     }       /**      * called when video stopped reason other paused      */     @override     public void onstopped() {         log.e("status", "stopped");     }       /**      * called when buffering of video starts or ends      * @param b true if buffering on, else false      */     @override     public void onbuffering(boolean b) {     }       /**      * called when jump in video happens. reason can either user scrubbing      * or seek method called explicitely      * @param      */     @override     public void onseekto(int i) {     } }  private final class statechangelistener implements youtubeplayer.playerstatechangelistener {      /**      * called when player begins loading video. during duration, player      * won't accept command may affect video playback      */     @override     public void onloading() {     }      /**      * called when video loaded. after player can accept      * playback affecting commands      * @param s video id string      */     @override     public void onloaded(string s) {     }       /**      * called when youtube ad started      */     @override     public void onadstarted() {     }       /**      * called when video starts playing      */     @override     public void onvideostarted() {     }       /**      * called when video ended      */     @override     public void onvideoended() {     }       /**      * called when kind of error occurs      * @param errorreason error string showing reason behind      */     @override     public void onerror(youtubeplayer.errorreason errorreason) {     } } 

}

*i have got android key.one thing have done updated android studio 2.0. * have registered on https://console.developers.google.com/apis/library?project=alien-vim-***** , enabled youtube data api.generated sha-1 , got android keys.

getting these errors:

            error creating youtubeplayerview             com.google.android.youtube.player.internal.w$a: exception thrown invoked       constructor in com.google.android.youtube.api.jar.client.remoteembeddedplayer               caused by: java.lang.reflect.invocationtargetexception              caused by: java.lang.illegalargumentexception: concrete class implementing iobjectwrapper must have *one* declared private field wrapped object.  preferably, instance of objectwrapper<t> class.             caused by: java.lang.illegalargumentexception: concrete class implementing iobjectwrapper must have *one* declared private field wrapped object.  preferably, instance of objectwrapper<t> class.  

this simple code, play video:

public class playvideo extends youtubebaseactivity implements         youtubeplayer.oninitializedlistener {     private youtubeplayer yplayer;     private static final string youtubedeveloperkey = "your key";     private static final int recovery_dialog_request = 1;      //string film = "http://www.youtube.com/watch?v=0c0pk9fahwa";     public static final string video_id = "0c0pk9fahwa";     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.layoutplayyoutube);           youtubeplayerview youtubeview = (youtubeplayerview) findviewbyid(r.id.youtube_view);         youtubeview.initialize(youtubedeveloperkey, this);      }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }      @override     public void oninitializationfailure(youtubeplayer.provider provider,             youtubeinitializationresult errorreason) {         if (errorreason.isuserrecoverableerror()) {             errorreason.geterrordialog(this, recovery_dialog_request).show();         } else {             string errormessage = string.format(                     "there error initializing youtubeplayer",                     errorreason.tostring());             toast.maketext(this, errormessage, toast.length_long).show();         }     }      @override     public void oninitializationsuccess(provider provider,             youtubeplayer player, boolean wasrestored) {         if (!wasrestored) {             yplayer = player;             /*              * variable yplayer global can access              * throughout activity, , perform player actions              * play, pause , seeking position code.              */             yplayer.cuevideo(video_id);         }     } } 

layout.xml:

<relativelayout 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:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     tools:context=".playvideo" >      <com.google.android.youtube.player.youtubeplayerview         android:id="@+id/youtube_view"         android:layout_width="match_parent"         android:layout_height="wrap_content" />  </relativelayout>