package com.pas.video.play;import java.io.File;import java.util.Timer;import java.util.TimerTask;import com.pas.video.play.R;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.media.MediaPlayer.OnErrorListener;import android.media.MediaPlayer.OnPreparedListener;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.view.Menu;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;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 implements OnClickListener {    private EditText et_mediaSrc;    private Button bt_play, bt_pause, bt_replay, bt_stop;    private SurfaceView sv;    private SeekBar seekBar_progress;    private Timer timer;    private TimerTask timerTask;    /**     * 互斥变量 解决进度条手动改变 与进度条线程中run方法自动改变之间的冲突     */    private Boolean ischanging = false;    // 媒体对象    private MediaPlayer mediaPlayer;    private int currentPosition = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {	super.onCreate(savedInstanceState);	setContentView(R.layout.activity_main);	et_mediaSrc = (EditText) findViewById(R.id.et_src);	sv = (SurfaceView) findViewById(R.id.sfView);	seekBar_progress = (SeekBar) findViewById(R.id.seekBar_progress);	seekBar_progress.setOnSeekBarChangeListener(new MySeekListener());	// 设置SurfaceView不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送用户界面	// 低版本必须 4.0之上无需设置	sv.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);	// 应用最小化后的处理与恢复处理	sv.getHolder().addCallback(new Callback() {	    // 最小化后 系统自动销毁surfaceview中的holder对象	    // 保存进度	    @Override	    public void surfaceDestroyed(SurfaceHolder holder) {		System.out.println("Holder销毁");		if (mediaPlayer != null && mediaPlayer.isPlaying()) {		    currentPosition = mediaPlayer.getCurrentPosition();		    stop();		}	    }	    @Override	    public void surfaceCreated(SurfaceHolder holder) {		System.out.println("Holder创建");		if (currentPosition > 0) {		    play(currentPosition);		}	    }	    @Override	    public void surfaceChanged(SurfaceHolder holder, int format,		    int width, int height) {		System.out.println("Holder大小改变");	    }	});	bt_play = (Button) findViewById(R.id.btn_play);	bt_pause = (Button) findViewById(R.id.btn_pause);	bt_replay = (Button) findViewById(R.id.btn_replay);	bt_stop = (Button) findViewById(R.id.btn_stop);	bt_play.setOnClickListener(this);	bt_pause.setOnClickListener(this);	bt_replay.setOnClickListener(this);	bt_stop.setOnClickListener(this);	et_mediaSrc.setText(Environment.getExternalStorageDirectory()		+ "/2.mp4");    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {	// Inflate the menu; this adds items to the action bar if it is present.	getMenuInflater().inflate(R.menu.main, menu);	return true;    }    private void showToast(String info) {	Toast.makeText(this, info, Toast.LENGTH_SHORT).show();    }    @Override    public void onClick(View v) {	switch (v.getId()) {	case R.id.btn_play:	    play(0);	    break;	case R.id.btn_pause:	    pause();	    break;	case R.id.btn_replay:	    rePlay();	    break;	case R.id.btn_stop:	    stop();	    break;	default:	    break;	}    }    /**     * 开启进度条     */    private void seekBarChanging() {	seekBar_progress.setMax(mediaPlayer.getDuration());	seekBar_progress.setProgress(currentPosition);	timer = new Timer();	timerTask = new TimerTask() {	    @Override	    public void run() {		if (ischanging == true) {		    return;		}		seekBar_progress.setProgress(mediaPlayer.getCurrentPosition());	    }	};	timer.schedule(timerTask, 0, 10);    }    /**     * 初始化进度条     */    private void initSeekBar() {	timer.cancel();	seekBar_progress.setProgress(0);    }    /**     * 播放 正常应写在服务中     *      * @param currentPosition2     */    private void play(final int Position) {	String path = et_mediaSrc.getText().toString().trim();	File file = new File(path);	if (file.exists()) {	    if (mediaPlayer != null) {		mediaPlayer.stop();		// 释放资源		mediaPlayer.release();		mediaPlayer = null;	    }	    mediaPlayer = new MediaPlayer();	    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);	    try {		// 指定video播放容器		// 播放视频只多一行		mediaPlayer.setDisplay(sv.getHolder());		mediaPlayer.setDataSource(path);		// 异步的准备 不阻塞主线程 但需要注册准备完毕的回调函数		mediaPlayer.prepareAsync();		// 回调		mediaPlayer.setOnPreparedListener(new OnPreparedListener() {		    @Override		    public void onPrepared(MediaPlayer mp) {			// 进度条			mediaPlayer.start();			mediaPlayer.seekTo(Position);			seekBarChanging();		    }		});		// 播放完毕的回调函数		mediaPlayer.setOnCompletionListener(new OnCompletionListener() {		    @Override		    public void onCompletion(MediaPlayer mp) {			// 播放完毕后设置播放按钮可用			bt_play.setEnabled(true);			initSeekBar();		    }		});		// 播放中出现错误（如流损坏）的回调函数		mediaPlayer.setOnErrorListener(new OnErrorListener() {		    @Override		    public boolean onError(MediaPlayer mp, int what, int extra) {			stop();			return false;		    }		});		// 播放开始后设置播放按钮不可用		bt_play.setEnabled(false);	    } catch (Exception e) {		showToast("播放失败");	    }	} else {	    showToast("文件不存在");	}    }    /**     * 停止播放并回收资源     */    private void stop() {	if (mediaPlayer != null) {	    if (mediaPlayer.isPlaying()) {		// 转到开头并关闭对象		mediaPlayer.seekTo(0);		mediaPlayer.stop();	    }	    // 释放进度条线程	    initSeekBar();	    // 释放资源	    mediaPlayer.release();	    mediaPlayer = null;	    // 播放完毕后设置播放按钮可用	    bt_play.setEnabled(true);	}    }    /**     * 重新播放     */    private void rePlay() {	if (bt_pause.getText().equals("继续")) {	    bt_pause.setText("暂停");	}	if (mediaPlayer != null && mediaPlayer.isPlaying()) {	    mediaPlayer.seekTo(0);	} else {	    stop();	    play(0);	}    }    /**     * 暂停播放     */    private void pause() {	if (mediaPlayer != null && mediaPlayer.isPlaying()) {	    mediaPlayer.pause();	    bt_pause.setText("继续");	} else if (bt_pause.getText().equals("继续")) {	    mediaPlayer.start();	    bt_pause.setText("暂停");	} else {	    showToast("当前未播放");	}    }    /**     * 进度条手动处理     */    private class MySeekListener implements OnSeekBarChangeListener {	@Override	public void onProgressChanged(SeekBar seekBar, int progress,		boolean fromUser) {	    if (mediaPlayer == null) {		return;	    }	    if (fromUser) {		// 如果用户拖动才执行 否则造成进度条线程 多重调用		ischanging = true;		mediaPlayer.seekTo(progress);	    }	}	@Override	public void onStartTrackingTouch(SeekBar seekBar) {	    ischanging = true;	}	@Override	public void onStopTrackingTouch(SeekBar seekBar) {	    if (mediaPlayer == null) {		return;	    }	    mediaPlayer.seekTo(seekBar.getProgress());	    ischanging = false;	}    }}