Android仿音乐播放器功能

import android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends AppCompatActivity {  private MediaPlayer mediaPlayer;  private SeekBar seekBar;  private TextView tv_mian_stop;  private TextView tv_mian_start;  private int musicaction;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    tv_mian_start = (TextView) findViewById(R.id.tv_mian_start);    tv_mian_stop = (TextView) findViewById(R.id.tv_mian_stop);    seekBar = (SeekBar) findViewById(R.id.seekBar);    //进度条的监听事件    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {      @Override      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {          //改变         //每当进度条发生改变时tv_mian_start的值发生变化         //new TimeUtil().secToTime()一个外部类（时间格式转化）         tv_mian_start.setText(new TimeUtil().secToTime(mediaPlayer.getCurrentPosition()/1000)+"");      }      @Override      public void onStartTrackingTouch(SeekBar seekBar) {          //开始      }      @Override      public void onStopTrackingTouch(SeekBar seekBar) {          //结束          //获取拖动结束之后的位置        int progrss=seekBar.getProgress();        mediaPlayer.seekTo(progrss);      }    });  }  public void isPlay(View view){    ImageButton imageButton= (ImageButton) view;    if (mediaPlayer==null){      mediaPlayer = MediaPlayer.create(this, R.raw.seve);      mediaPlayer.start();      //把图标修改为暂停的图标      imageButton.setImageResource(android.R.drawable.ic_media_pause);      //获取音乐的总时长      int muiscsum=mediaPlayer.getDuration();      //设置进度条的最大值为总时长       seekBar.setMax(muiscsum);       //执行一个多线程的耗时操作       new MyThread().start();       tv_mian_stop.setText(new TimeUtil().secToTime(muiscsum/1000)+"");    }else if (mediaPlayer.isPlaying()){      mediaPlayer.pause();      imageButton.setImageResource(android.R.drawable.ic_media_play);    }else{      mediaPlayer.start();      imageButton.setImageResource(android.R.drawable.ic_media_pause);    }  }  class MyThread extends Thread{    @Override    public void run() {      super.run();      //当进度条的当前值小于最大值时进度条发生改变      while(seekBar.getProgress()<=seekBar.getMax()){      //获取当前音乐播放的位置      musicaction = mediaPlayer.getCurrentPosition();      //让进度条动起来     seekBar.setProgress(musicaction);      }    }  }}

public class TimeUtil {  public static String secToTime(int time) {    String timeStr = null;    int hour = 0;    int minute = 0;    int second = 0;    if (time <= 0)      return "00:00";    else {      minute = time / 60;      if (minute < 60) {        second = time % 60;        timeStr = unitFormat(minute) + ":" + unitFormat(second);      } else {        hour = minute / 60;        if (hour > 99)          return "99:59:59";        minute = minute % 60;        second = time - hour * 3600 - minute * 60;        timeStr = unitFormat(hour) + ":" + unitFormat(minute) + ":" + unitFormat(second);      }    }    return timeStr;  }  private static String unitFormat(int i) {    String retStr = null;    if (i >= 0 && i < 10)      retStr = "0" + Integer.toString(i);    else      retStr = "" + i;    return retStr;  }}