Android_播放器的进度条

package com.itheima.musicplayer;

import java.io.File;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {
private EditText et_path;
private MediaPlayer mediaPlayer;

private Button bt_play,bt_pause,bt_stop,bt_replay;private SurfaceView sv;private SurfaceHolder holder;private int position;private String filepath;private SeekBar seekBar1;private Timer timer;private TimerTask task;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    et_path = (EditText) findViewById(R.id.et_path);    bt_play = (Button) findViewById(R.id.bt_play);    bt_pause = (Button) findViewById(R.id.bt_pause);    bt_stop = (Button) findViewById(R.id.bt_stop);    bt_replay = (Button) findViewById(R.id.bt_replay);    seekBar1 = (SeekBar) findViewById(R.id.seekBar1);

// 进度条
// Sets a listener to receive notifications of changes to the SeekBar’s progress level. Also provides notifications of when the user starts and stops a touch gesture within the SeekBar.
//
// Parameters:
// l The seek bar notification listener
seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

        @Override        public void onStopTrackingTouch(SeekBar seekBar) {            int postion = seekBar.getProgress();            mediaPlayer.seekTo(postion);        }        @Override        public void onStartTrackingTouch(SeekBar seekBar) {        }        @Override        public void onProgressChanged(SeekBar seekBar, int progress,                boolean fromUser) {        }    });    //得到surfaceview    sv = (SurfaceView) findViewById(R.id.sv);    //得到显示界面内容的容器    holder = sv.getHolder();    //在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    holder.addCallback(new Callback() {        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            System.out.println("destoryed");            if(mediaPlayer!=null&&mediaPlayer.isPlaying()){                position = mediaPlayer.getCurrentPosition();                mediaPlayer.stop();                mediaPlayer.release();                mediaPlayer = null;                timer.cancel();                task.cancel();                timer = null;                task = null;            }        }        @Override        public void surfaceCreated(SurfaceHolder holder) {            System.out.println("created");            if(position>0){//记录的有播放进度。                try {                    mediaPlayer = new MediaPlayer();                    mediaPlayer.setDataSource(filepath);//设置播放的数据源。                    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);                    mediaPlayer.setDisplay(holder);                    mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。                    mediaPlayer.start();                    mediaPlayer.seekTo(position);                    bt_play.setEnabled(false);                    mediaPlayer.setOnCompletionListener(new OnCompletionListener() {                        @Override                        public void onCompletion(MediaPlayer mp) {                            bt_play.setEnabled(true);                        }                    });                    int max = mediaPlayer.getDuration();                    seekBar1.setMax(max);                    timer = new Timer();                    task = new TimerTask() {                        @Override                        public void run() {                            seekBar1.setProgress(mediaPlayer.getCurrentPosition());                        }                    };                    timer.schedule(task, 0, 500);                } catch (IOException e) {                    e.printStackTrace();                }            }        }        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                int height) {            System.out.println("changed");        }    });}/** * 播放 * @param view */public void play(View view) {    filepath = et_path.getText().toString().trim();    File file = new File(filepath);    if(file.exists()){        try {            mediaPlayer = new MediaPlayer();            mediaPlayer.setDataSource(filepath);//设置播放的数据源。            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            mediaPlayer.setDisplay(holder);            mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。            mediaPlayer.start();            //设置拖动进度条的最大值            int max = mediaPlayer.getDuration();            seekBar1.setMax(max);            timer = new Timer();            task = new TimerTask() {                @Override                public void run() {                    seekBar1.setProgress(mediaPlayer.getCurrentPosition());                }            };            timer.schedule(task, 0, 500);            bt_play.setEnabled(false);            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {                @Override                public void onCompletion(MediaPlayer mp) {                    bt_play.setEnabled(true);                }            });        } catch (Exception e) {            e.printStackTrace();            Toast.makeText(this, "播放失败", 0).show();        }    }else{        Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();    }}/** * 暂停 * @param view */public void pause(View view) {    if("继续".equals(bt_pause.getText().toString())){        mediaPlayer.start();        bt_pause.setText("暂停");        return;    }    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){        mediaPlayer.pause();        bt_pause.setText("继续");    }}/** * 停止 * @param view */public void stop(View view) {    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){        mediaPlayer.stop();        mediaPlayer.release();        mediaPlayer = null;    }    bt_pause.setText("暂停");    bt_play.setEnabled(true);}/** * 重播 * @param view */public void replay(View view) {    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){        mediaPlayer.seekTo(0);    }else{        play(view);    }    bt_pause.setText("暂停");}

}

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