如何快速播放歌曲时，我按住按钮

Question

当我在音乐播放器中播放歌曲时，当我按下一个按钮时，我正在转发歌曲一段时间，我正在实施这种方式，但我需要当我按住快速前进的按钮来移动歌曲意味着作为我们的真正的音乐播放器，我如何执行，请帮助我如何实现快进按钮的功能是我们的音乐播放器快进按钮相同。

public class MainActivity extends Activity implements OnCompletionListener, 
      SeekBar.OnSeekBarChangeListener { 

     private ImageButton btnDecreaseSound, btnIncSound, btnReverse, btnPlay, btnForward, 
       btnPause; 
     private TextView currenttime, endtime; 

     private LinearLayout btnRedo, btnDelete; 
     private SeekBar songProgressBar; 
     private MediaPlayer mp; 
     private SongsManager songManager; 
     private Utilities utils; 
     private int seekForwardTime = 5000; // 5000 milliseconds 
     private int seekBackwardTime = 5000; // 5000 milliseconds 
     private int currentSongIndex = 0; 
     private SeekBar volumeSeekbar ; 
     private AudioManager audioManager ; 
     private Handler mHandler = new Handler(); 
     private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>(); 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 



      // Mediaplayer 
      mp = new MediaPlayer(); 
      songManager = new SongsManager(); 
      utils = new Utilities(); 
      final SoundPool spool = null; 
       final int soundID = 0; 



      audioManager = (AudioManager) getSystemService(getApplicationContext().AUDIO_SERVICE); 
      volumeSeekbar.setMax(audioManager 
        .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 
      volumeSeekbar.setProgress(audioManager 
        .getStreamVolume(AudioManager.STREAM_MUSIC)); 



      // Listeners 
      songProgressBar.setOnSeekBarChangeListener(this); // Important 
      mp.setOnCompletionListener(this); // Important 

      // Getting all songs list 
      songsList = songManager.getPlayList(); 

      // By default play first song 

      btnPlay.setOnClickListener(new OnClickListener() { 

       @Override 
       public void onClick(View v) { 


        if (mp.isPlaying()) { 
         if (mp != null) { 
          mp.pause(); 
          // Changing button image to play button 
          btnPlay.setImageResource(R.drawable.playbtn); 
         } 
        } else { 
         if (mp != null) { 
          mp.start(); 
          // 
          btnPlay.setImageResource(R.drawable.pauseiconbtn); 
         } 
        } 

       } 
      }); 




      volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
      { 
       @Override 
       public void onStopTrackingTouch(SeekBar arg0) 
       { 
       } 

       @Override 
       public void onStartTrackingTouch(SeekBar arg0) 
       { 
       } 

       @Override 
       public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
       { 
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 
          progress, 0); 
       } 
      }); 


      btnReverse.setOnClickListener(new OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 

        // get current song position 
        int currentPosition = mp.getCurrentPosition(); 
        // check if seekBackward time is greater than 0 sec 
        if (currentPosition - seekBackwardTime >= 0) { 
         // forward song 
         mp.seekTo(currentPosition - seekBackwardTime); 
        } else { 
         // backward to starting position 
         mp.seekTo(0); 
        } 

       } 
      }); 

      btnForward.setOnClickListener(new OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 
        int currentPosition = mp.getCurrentPosition(); 
        // check if seekForward time is lesser than song duration 
        if (currentPosition + seekForwardTime <= mp.getDuration()) { 
         // forward song 
         mp.seekTo(currentPosition + seekForwardTime); 
        } else { 
         // forward to end position 
         mp.seekTo(mp.getDuration()); 
        } 
       } 
      }); 

     public void playSong(int songIndex) { 
      // Play song 
      try { 
       mp.reset(); 
       mp.setDataSource(songsList.get(songIndex).get("songPath")); 
       mp.prepare(); 
       mp.start(); 
       // Displaying Song title 
       String songTitle = songsList.get(songIndex).get("songTitle"); 

       songProgressBar.setProgress(0); 
       songProgressBar.setMax(100); 

       // Updating progress bar 
       updateProgressBar(); 
      } catch (IllegalArgumentException e) { 
       e.printStackTrace(); 
      } catch (IllegalStateException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 

     public void updateProgressBar() { 
      mHandler.postDelayed(mUpdateTimeTask, 100); 
     } 

     private Runnable mUpdateTimeTask = new Runnable() { 
      public void run() { 
       long totalDuration = mp.getDuration(); 
       long currentDuration = mp.getCurrentPosition(); 

       // Displaying Total Duration time 
       // endtime.setText(""+utils.milliSecondsToTimer(totalDuration)); 
       // Displaying time completed playing 
       currenttime 
         .setText("" + utils.milliSecondsToTimer(currentDuration)); 

       // 

       String l = utils.milliSecondsToTimer(currentDuration); 
       String l2 = utils.milliSecondsToTimer(currentDuration); 

       long number = totalDuration - currentDuration; 

       String timechange = utils.milliSecondsToTimer(number); 

       System.out.println("l value: " + timechange); 
       endtime.setText("-" + timechange); 
       // Updating progress bar 
       int progress = (int) (utils.getProgressPercentage(currentDuration, 
         totalDuration)); 
       // Log.d("Progress", ""+progress); 
       songProgressBar.setProgress(progress); 

       // Running this thread after 100 milliseconds 
       mHandler.postDelayed(this, 100); 
      } 
     }; 

     @Override 
     public void onProgressChanged(SeekBar seekBar, int progress, 
       boolean fromTouch) { 

     } 

     /** 
     * When user starts moving the progress handler 
     * */ 
     @Override 
     public void onStartTrackingTouch(SeekBar seekBar) { 
      // remove message Handler from updating progress bar 
      mHandler.removeCallbacks(mUpdateTimeTask); 
     } 

     /** 
     * When user stops moving the progress hanlder 
     * */ 
     @Override 
     public void onStopTrackingTouch(SeekBar seekBar) { 
      mHandler.removeCallbacks(mUpdateTimeTask); 
      int totalDuration = mp.getDuration(); 
      int currentPosition = utils.progressToTimer(seekBar.getProgress(), 
        totalDuration); 

      // forward or backward to certain seconds 
      mp.seekTo(currentPosition); 

      // update timer progress again 
      updateProgressBar(); 
     } 

     /** 
     * On Song Playing completed if repeat is ON play same song again if shuffle 
     * is ON play random song 
     * */ 
     @Override 
     public void onCompletion(MediaPlayer arg0) { 

      // check for repeat is ON or OFF 

      playSong(0); 
      currentSongIndex = 0; 

     } 

     @Override 
     public void onDestroy() { 
      super.onDestroy(); 
      mp.release(); 
     } 

Answer 1

不能覆盖Home键自定义应用程序。这是保留的。请谷歌关于凌驾主页按钮

请转到此链接\，你可以在这里得到你的答案。 Android Overriding home key