Question

我已经为Android中的媒体播放器创建了演示。我在开始运行我的应用程序时遇到了问题。当我的应用程序运行时，歌曲正在播放但没有播放完整的歌曲它刚刚开始并立即完成意味着它刚刚开始活动，并立即恢复（）状态。当歌曲越过我再次重新启动我的活动歌曲不是从开始从中间开始播放。我在过去1周面对这个问题，我不明白如何解决它。请任何人帮助我。这是我的代码。谢谢你。

public class Audio_Activity extends Activity 
{
    private MediaPlayer mp = null;
    PhoneStateListener phListener;
    int length;
    SharedPreferences prefs;
    ImageView imgVw;


    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.audio);
        init();
        imgVw.setImageResource(R.raw.teddy_two);

        prefs = PreferenceManager.getDefaultSharedPreferences(this);
        final SharedPreferences. Editor prefsEdit = prefs.edit();

         mp=MediaPlayer.create(Audio_Activity.this,R.raw.issaq_tera_by_vishu);
         Log.e("Song is playing","in  Mediya Player ");

         mp.start();
         mp.setLooping(false);
         System.out.println("Media Plyer Is Start !!!");
         prefsEdit.putBoolean("mediaplaying", true);
         prefsEdit.commit();
         btnChapter.setEnabled(false);

        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() 
        {

            @Override
            public void onCompletion(MediaPlayer mp) 
            {
                // TODO Auto-generated method stub
                mp.stop();
                 System.out.println("Media Plyer Is Complete !!!");
                //mp.release();
                prefsEdit.putBoolean("mediaplaying", false);
                prefsEdit.commit();
                btnChapter.setEnabled(true);
                System.out.println("Music is over and Button is enable !!!!!!");
            }
        });


        PhoneStateListener phoneStateListener = new PhoneStateListener()
          {
                @Override
                public void onCallStateChanged(int state, String incomingNumber)

                {
                    if (state == TelephonyManager.CALL_STATE_RINGING) 

                    {

                        if(mp!=null)

                        {
                            setPlayerButton(true, false, true);

                            if(mp.isPlaying())
                            { 

                                mp.pause();

                            }
                        }

                    } else if(state == TelephonyManager.CALL_STATE_IDLE) {

                    } else if(state == TelephonyManager.CALL_STATE_OFFHOOK) {

                    }
                    super.onCallStateChanged(state, incomingNumber);
                }
            };

            TelephonyManager mgr = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

             if(mgr != null) 
             {

                 mgr.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
             }


    }


    private void setPlayerButton(Boolean play, Boolean pause, Boolean stop){
        btnStartStop.setEnabled(play);
        if(play==true)
            btnStartStop.setEnabled(true);
        else
            btnStartStop.setEnabled(false);

    }



     @Override
        public void onConfigurationChanged(Configuration newConfig)
     {
            super.onConfigurationChanged(newConfig);

            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

      }


     @Override
     public void onPause()
     {
         super.onPause();

          SharedPreferences. Editor prefsEdit = prefs.edit();
          boolean isPlaying=prefs.getBoolean("mediaplaying",false);
          if(isPlaying)
          {
              int position = mp.getCurrentPosition();
              Log.e("Current ","Position -> " + position);
              prefsEdit.putInt("mediaPosition", position);
              prefsEdit.commit();
          }
     }


     @Override
        protected void onResume() 
        {
            super.onResume();

            System.out.println("Activity is Resume !!!");

            boolean isPlaying=prefs.getBoolean("mediaplaying",false);
            if(isPlaying)
            {
                  int position = prefs.getInt("mediaPosition", 0);
                  mp.seekTo(position);
                  mp.start();

            }

        }



    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) 
    {
        super.onStop();

        if ((keyCode == KeyEvent.KEYCODE_BACK)) 
        { 
            if(mp!= null)
            {
                if(mp.isPlaying())
                {
                    mp.pause();
                     System.out.println("Media Player is Pause/Stop click on Back button on Emulator!!!");

                }
            }
            finish();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
}

Answer 1

从歌曲问题的中间开始是因为您将歌曲的当前进度存储在SharedPreferences中，然后在onResume()处从存储在SharedPreferences的进度位置启动播放器

Answer 2

最好通过OnPreapredListener注册MediaPlayer.setOnPreaparedListener，并在准备好后开始播放媒体。

官方指南：

http://developer.android.com/guide/topics/media/mediaplayer.html

Answer 3

请尝试使用以下代码。

        void play() {

         mediaPlayer = MediaPlayer.create(
            getApplicationContext(), R.raw.keytone);
    try {
        mediaPlayer.prepare();
    } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    mediaPlayer.start();

                   }
  private void pause()

     {

         mediaPlayer.release();

       }

如何在Android中使用Media Player？

3 个答案: