android - 重置后android mediaplayer将无法开始播放

Question

我的 Activity 中有一个媒体播放器，并且有两个按钮可以播放下一个和上一个声音。
我希望当用户在下一个或上一个按钮上使用Tab键时，声音停止播放，并显示有关下一个或上一个声音的详细信息，然后单击“播放”按钮开始播放，以实现我使用reset()的目的。但是当我想播放下一个声音时，它不会播放。

package com.example.listeninglevel1;

public class PagesActivity extends SherlockActivity implements Runnable, OnClickListener, OnSeekBarChangeListener{
SubMenu sm;
public static int pos=1, lastPage=5;
ImageButton next, back, nextNoneSelect, backNoneSelect;
String txstory;
TextView txview;
public static RelativeLayout relSeek, relMain;
private String[] title = new String[6];
private SeekBar seekBar;
private ImageButton startMedia;
private ImageButton pauseMedia;
public static MediaPlayer mp = new MediaPlayer();

@Override
protected void onCreate(Bundle savedInstanceState) {
    setTheme(R.style.Theme_Sherlock_Light);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.pages);

    AudioControl();   

    next = (ImageButton) findViewById(R.id.next);
    next.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            if (pos < lastPage) {
                pos++;
            } 
            mp.reset();
            pauseMedia.setVisibility(View.INVISIBLE);
            startMedia.setVisibility(View.VISIBLE);
        }
    });

    back = (ImageButton) findViewById(R.id.back);
    back.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            if (pos > 1) {
                pos--;
            }
            mp.reset();
            pauseMedia.setVisibility(View.INVISIBLE);
            startMedia.setVisibility(View.VISIBLE);
        }
    });

}

 public void AudioControl(){
        seekBar = (SeekBar) findViewById(R.id.seekBar1);
        startMedia = (ImageButton) findViewById(R.id.play);
        pauseMedia = (ImageButton) findViewById(R.id.pause);
        seekBar.setOnSeekBarChangeListener(this);
        startMedia.setOnClickListener(this);
        pauseMedia.setOnClickListener(this); 
    }

    public void run() {
        int currentPosition= 0;
        int total = mp.getDuration();
        while (mp!=null && currentPosition<total) {
            try {
                Thread.sleep(1000);
                currentPosition= mp.getCurrentPosition();
            } catch (InterruptedException e) {
                return;
            } catch (Exception e) {
                return;
            }            
            seekBar.setProgress(currentPosition);
        }
    }

    public void onClick(View v) {
        pauseMedia.setVisibility(View.VISIBLE);
        seekBar.setVisibility(View.VISIBLE);
        startMedia.setVisibility(View.INVISIBLE);
        if (v.equals(startMedia)) {
            if (mp != null && mp.isPlaying()) return;
            if(seekBar.getProgress() > 0) {
                mp.start();
                return;
            }
            int[] arr = {R.raw.sound1,R.raw.sound2,R.raw.sound3,R.raw.sound4,R.raw.sound5};
            int snum = pos -1;
            mp = MediaPlayer.create(PagesActivity.this, arr[snum]);
            mp.start();            

            seekBar.setProgress(0);
            seekBar.setMax(mp.getDuration());
            new Thread(this).start();
        }

        if (v.equals(pauseMedia) && mp!=null) {
            mp.pause();
            pauseMedia.setVisibility(View.INVISIBLE);
            startMedia.setVisibility(View.VISIBLE);
        }       
    }

    @Override
    public void onPause() {
        super.onPause();
        if (mp!=null) {
            mp.pause();
        }  
    }

    public void onStartTrackingTouch(SeekBar seekBar) {
    }

    public void onStopTrackingTouch(SeekBar seekBar) {
    }

    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        if(fromUser) mp.seekTo(progress);

    }
}

Answer 1

您可以尝试

mp.pause();
mp.seekTo(0);

这将暂停MP Player并返回歌曲以开始播放。下次单击时，它将从头开始播放Media Player。

if (mp.isPlaying()){
                    mp.pause();
                    mp.seekTo(0);
                }
                else{
                    mp.start();
                }
                }