package com.zhang.videoplay;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.support.v7.app.AppCompatActivity;import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;public class MainActivity extends AppCompatActivity implements View.OnClickListener {private Button plastart, pause, playstop, rebroadcast;private SurfaceView surfaceView;private SeekBar seekBar;private MediaPlayer mediaPlayer;private int currentPosition = 0;private boolean isPlaying;private TextView startTime,sumTime;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();// 为SurfaceHolder添加回调surfaceView.getHolder().addCallback(callback);// 设置Surface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到界面surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 为进度条添加进度更改事件seekBar.setOnSeekBarChangeListener(change);}private void initView() {plastart = (Button) findViewById(R.id.playstart);plastart.setOnClickListener(this);pause = (Button) findViewById(R.id.pause);pause.setOnClickListener(this);playstop = (Button) findViewById(R.id.playstop);playstop.setOnClickListener(this);rebroadcast = (Button) findViewById(R.id.rebroadcast);rebroadcast.setOnClickListener(this);sumTime= (TextView) findViewById(R.id.sumTime);startTime= (TextView) findViewById(R.id.startime);surfaceView = (SurfaceView) findViewById(R.id.surfaceView);seekBar = (SeekBar) findViewById(R.id.seekBar);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.playstart://开始play(0);plastart.setEnabled(false);break;case R.id.playstop://停止stop();break;case R.id.rebroadcast://重播replay();break;case R.id.pause://暂停pause();break;}}// 添加一个Callback对象监听SurfaceView的变化private Callback callback = new Callback() {// SurfaceHolder被修改的时候回调@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {Log.i("info", "SurfaceHolder 被销毁");// 销毁SurfaceHolder的时候记录当前的播放位置并停止播放if (mediaPlayer != null && mediaPlayer.isPlaying()) {currentPosition = mediaPlayer.getCurrentPosition();mediaPlayer.stop();}}//SurfaceView创建时触发@Overridepublic void surfaceCreated(SurfaceHolder holder) {Log.i("info", "SurfaceHolder 被创建");if (currentPosition > 0) {// 创建SurfaceHolder的时候，如果存在上次播放的位置，则按照上次播放位置进行播放play(currentPosition);currentPosition = 0;}}//SurfaceView改变时触发@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {Log.i("info", "SurfaceHolder 大小被改变");}};private OnSeekBarChangeListener change = new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// 当进度条停止修改的时候触发// 取得当前进度条的刻度int progress = seekBar.getProgress();if (mediaPlayer != null && mediaPlayer.isPlaying()) {// 设置当前播放的位置mediaPlayer.seekTo(progress);}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {Log.i("info","onStopTrackingTouch--"+progress);shiftTime(startTime,progress);}};/*** 开始播放** @param msec 播放初始位置*/protected void play(final int msec) {// 获取视频文件地址String path = "/storage/emulated/0/Download/video.mp4";File file = new File(path);if (!file.exists()) {Toast.makeText(this, "视频文件路径错误", Toast.LENGTH_LONG).show();return;}try {mediaPlayer = new MediaPlayer();mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);// 设置播放的视频源Log.i("info", "1111111" + file.getAbsolutePath());mediaPlayer.setDataSource(file.getAbsolutePath());// 设置显示视频的SurfaceHolder,指定视频画面输出到SurfaceView之上mediaPlayer.setDisplay(surfaceView.getHolder());Log.i("info", "开始装载");mediaPlayer.prepareAsync();mediaPlayer.setOnPreparedListener(new OnPreparedListener() {@Overridepublic void onPrepared(MediaPlayer mp) {Log.i("info", "装载完成");mediaPlayer.start();// 按照初始位置播放mediaPlayer.seekTo(msec);// 设置进度条的最大进度为视频流的最大播放时长seekBar.setMax(mediaPlayer.getDuration());Log.i("info","2222222222-----"+mediaPlayer.getDuration());//将刻度转换成时间mm：ssshiftTime(sumTime,mediaPlayer.getDuration());// 开始线程，更新进度条的刻度new Thread() {@Overridepublic void run() {try {isPlaying = true;while (isPlaying) {int current = mediaPlayer.getCurrentPosition();seekBar.setProgress(current);sleep(1000);}} catch (Exception e) {e.printStackTrace();}}}.start();//将停止按钮设置不可点击playstop.setEnabled(false);}});mediaPlayer.setOnCompletionListener(new OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {// 在播放完毕被回调playstop.setEnabled(true);}});mediaPlayer.setOnErrorListener(new OnErrorListener() {@Overridepublic boolean onError(MediaPlayer mp, int what, int extra) {// 发生错误重新播放Log.i("info","onError---"+what);play(0);isPlaying = false;return false;}});} catch (Exception e) {e.printStackTrace();}}/*** 重新开始播放*/protected void replay() {if (mediaPlayer != null&& mediaPlayer.isPlaying()){mediaPlayer.seekTo(0);Toast.makeText(this,"重新播放",Toast.LENGTH_LONG).show();pause.setText("暂停");return;}play(0);isPlaying = false;}/*** 暂停或继续*/protected void pause() {if (pause.getText().toString().trim().equals("继续")) {pause.setText("暂停");mediaPlayer.start();Toast.makeText(this, "继续播放", Toast.LENGTH_SHORT).show();return;}if (mediaPlayer != null && mediaPlayer.isPlaying()) {mediaPlayer.pause();pause.setText("继续");Toast.makeText(this,"暂停播放",Toast.LENGTH_SHORT).show();}}/*** 停止播放*/protected void stop() {if (mediaPlayer != null && mediaPlayer.isPlaying()) {mediaPlayer.stop();mediaPlayer.release();mediaPlayer = null;playstop.setEnabled(true);isPlaying = false;}}//将刻度转换为时间private void shiftTime(TextView view,int time){Date date = new Date();SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");date.setTime(time);String str = sdf.format(date);Log.i("info","33333333-----"+str);view.setText(str);}}

3.加入权限

 <!-- 写外部存储即sdcard的权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><!-- 打开关闭sdcard的权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>