media player - Android MediaPlayer seekTo() function working incorrect -

i have problem when using mediaplayer play video url.

the follow of program : create activity play video -> press home button -> app.

the requirement video play start, when press home button video continuos play(only audio), , when app, video must play continuous(combine movie , audio).

the first, created mediaplayer variable play video. when home button pressed, mediaplayer play continuous. when app, video cannot displayed(black screen). so, created other mediaplayer variable solved issue. when using seekto() function seek second mediaplayer position of first mediaplayer, function working incorrect.

import java.io.ioexception; import com.example.videotest.r;  import android.app.activity; import android.media.audiomanager; import android.media.mediaplayer; import android.media.mediaplayer.onbufferingupdatelistener; import android.media.mediaplayer.oncompletionlistener; import android.media.mediaplayer.onpreparedlistener; import android.media.mediaplayer.onseekcompletelistener; import android.media.mediaplayer.onvideosizechangedlistener; import android.net.uri; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.motionevent; import android.view.surfaceholder; import android.view.surfaceview; import android.view.view; import android.view.view.ontouchlistener; import android.view.window; import android.view.view.onclicklistener; import android.view.viewgroup.layoutparams; import android.widget.button; import android.widget.framelayout; import android.widget.linearlayout; import android.widget.toast;  public class playvideoactivity extends activity implements onclicklistener,surfaceholder.callback, fgmediacontroller.mediaplayercontrol {       surfaceview videosurface,videosurfacefullscreen,videosurfacesmallsceen;     mediaplayer player, backupplayer;     fgmediacontroller controller;     linearlayout llcontrollerbar;     public boolean isfullscreen = false;     int videoduration;     int videocurrent;     surfaceholder viewholder = null;     boolean ispaused = false;     string videourl = "http://cdn-smatopi.tv-bank.com/movie/867/867-32/867-32-2015042306-d3/hls/hls3/867-32-2015042306-d3-hls3.m3u8";      button btnseek, btnrelease;      int currentpos = 30000;      boolean videoprepared = false;     boolean backupprepared = false;     boolean mvideosizeisset = false;       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         requestwindowfeature(window.feature_no_title);         setcontentview(r.layout.playvideo);          btnseek = (button) findviewbyid(r.id.btnseek);         btnrelease = (button) findviewbyid(r.id.btnrelease);         videosurface = (surfaceview)findviewbyid(getresources().getidentifier("vvvideo", "id", getpackagename()));         surfaceholder videoholder = videosurface.getholder();         videoholder.addcallback(this);         player = new mediaplayer();         backupplayer = new mediaplayer();          controller = new fgmediacontroller(this);          try {             player.setaudiostreamtype(audiomanager.stream_music);             player.setdatasource(this, uri.parse(videourl));             player.prepareasync();             //backupplayer.setaudiostreamtype(audiomanager.stream_music);             //backupplayer.setdatasource(this, uri.parse(videourl));             //backupplayer.prepareasync();         } catch (exception e) {             e.printstacktrace();         }          btnseek.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 // todo auto-generated method stub                 log.e("huhu",currentpos + "");                 backupplayer.seekto(currentpos);             }         });          btnrelease.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 // todo auto-generated method stub                 backupplayer.stop();                 backupplayer.release();             }         });          player.setonbufferingupdatelistener(new onbufferingupdatelistener() {             public void onbufferingupdate(mediaplayer mp, int percent) {              }         });           player.setonpreparedlistener(new onpreparedlistener() {             @override             public void onprepared(mediaplayer mp) {                 controller.setmediaplayer(playvideoactivity.this);                 controller.setanchorview((framelayout) findviewbyid(playvideoactivity.this.getresources().getidentifier("videosurfacecontainer", "id", playvideoactivity.this.getpackagename())));                 player.start();             }         });       }      @override     public void ondestroy(){         //backupplayer.release();         player.release();         super.ondestroy();      }      @override     public void onresume(){         log.e("surface created","onresume");         super.onresume();     }        // implement surfaceholder.callback     @override     public void surfacechanged(surfaceholder holder, int format, int width, int height) {      }      @override     public void surfacecreated(surfaceholder holder) {         log.e("surface created","surface created! " + holder);         if(viewholder != null){             viewholder = holder;                 backupplayer = new mediaplayer();             try {                 backupplayer.setaudiostreamtype(audiomanager.stream_music);                 backupplayer.setdatasource(this, uri.parse(videourl));                 backupplayer.prepareasync();                  backupplayer.setdisplay(holder);                   backupplayer.setonpreparedlistener(new onpreparedlistener() {                     @override                     public void onprepared(mediaplayer mp) {                         backupprepared = true;                         backupplayer.start();                     }                 });                  backupplayer.setonvideosizechangedlistener(new onvideosizechangedlistener() {                     @override                     public void onvideosizechanged(mediaplayer mp, int width, int height) {                         // todo auto-generated method stub                         if (width == 0 || height == 0){                             toast.maketext(getapplicationcontext(),"width = 0 height = 0"+ mp.getduration(), toast.length_long).show();                         }else{                             if(backupprepared){                                 backupprepared = false;                                 currentpos = player.getcurrentposition();                                 player.reset();                                 toast.maketext(getapplicationcontext(),"seek  "+ backupplayer.getcurrentposition() + " | " + backupplayer.isplaying() + "|" + currentpos, toast.length_long).show();                                 log.e("huhu","seek  "+ backupplayer.getcurrentposition() + " | " + backupplayer.isplaying() + "|" + currentpos);                                 backupplayer.seekto(currentpos); // if set currentpos = 20000ms or 30000ms backupplayer can seek, if set currentpos = 10000ms backupplayer cannot seek !                              }                         }                      }                 });              } catch (exception e) {                 e.printstacktrace();             }          }else{             player.setdisplay(holder);         }      }      @override     public void surfacedestroyed(surfaceholder holder) {         log.e("surface created","surfacedestroyed! " + player.getcurrentposition());         viewholder = holder;             }      // end mediaplayer.onpreparedlistener     // implement videomediacontroller.mediaplayercontrol     @override     public boolean canpause() {         return true;     }     @override     public boolean canseekbackward() {         return true;     }     @override     public boolean canseekforward() {         return true;     }      @override     public int getbufferpercentage() {         return 0;     }      @override     public int getcurrentposition() {         //log.printlog(log.error, "current :"+player.getcurrentposition());         int current = 0;         try{             current = player.getcurrentposition();         }catch(exception e){             e.printstacktrace();         }         return current;     }      @override     public int getduration() {         int duration = 0;         try{             duration = player.getduration();         }catch(exception e){             e.printstacktrace();         }         return duration;     }      @override     public boolean isplaying() {         boolean isplaying = false;         try{             isplaying = player.isplaying();         }catch(exception e){             e.printstacktrace();         }         return isplaying;     }      @override     public void pause() {         player.pause();     }      @override     public void seekto(int i) {         player.seekto(i);     }     @override     public void start() {         player.start();     }     @override     public boolean isfullscreen() {         return isfullscreen;     }       @override     public void togglefullscreen() {         // todo auto-generated method stub      }       @override     public void dobackpressed() {         // todo auto-generated method stub      }       @override     public void onclick(view v) {      }      }