<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_media_play"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 android:orientation="vertical"
 tools:context="com.zking.android_contentresolve.MediaPlayActivity">


 <SurfaceView
  android:layout_width="match_parent"
  android:layout_height="300dp"
  android:id="@+id/sv_media_surface"
  />



 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal"
  >
  <SeekBar
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/seekBar"
   android:layout_weight="1" />

  <ImageButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:src="@android:drawable/ic_media_play"
   android:onClick="isPlayOrPause"
   />
 </LinearLayout>
</LinearLayout>

//播放内存上的视频
mediaPlayer.setDataSource(this, Uri.parse("file://mnt/sdcard/Movies/sister.mp4"));

//准备(内存卡)
mediaPlayer.prepare();

//将媒体播放器捕捉的画面展示在SurfaceView 上
mediaPlayer.setDisplay(sv_media_surface.getHolder());

public class MediaPlayActivity extends AppCompatActivity {
 private SeekBar seekBar;
 private MediaPlayer mediaPlayer;
 private SurfaceView sv_media_surface;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_media_play);
  seekBar = (SeekBar) findViewById(R.id.seekBar);
  sv_media_surface = (SurfaceView) findViewById(R.id.sv_media_surface);

  seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
   @Override
   public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {

   }

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
    //获取拖动结束后的位置
    int progress=seekBar.getProgress();
    //跳转到某个位置播放
    mediaPlayer.seekTo(progress);
   }
  });
 }

 public void isPlayOrPause(View view){
  final ImageButton imageButton= (ImageButton) view;

  if(mediaPlayer==null){//代表第一次播放音乐

   //播放内存卡内的音频
   mediaPlayer=new MediaPlayer();
   //设置类型
   mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   //设置音源
   try {
    //播放内存上的视频
    mediaPlayer.setDataSource(this, Uri.parse("file://mnt/sdcard/Movies/sister.mp4"));
    //准备(内存卡)
    mediaPlayer.prepare();

    //将媒体播放器捕捉的画面展示在SurfaceView 上
    mediaPlayer.setDisplay(sv_media_surface.getHolder());

    //必须在播放前加载音频文件(异步准备)
//    mediaPlayer.prepareAsync();

   } catch (IOException e) {
    e.printStackTrace();
   }

   mediaPlayer.start();
   //把图标改成暂停的图标（这里的暂停图标就是播放时的状态）
   imageButton.setImageResource(android.R.drawable.ic_media_pause);

   //获取音乐的总时长
   int duration=mediaPlayer.getDuration();
   //设置进度条的最大值为音乐的总时长
   seekBar.setMax(duration);

   new MyThread();
  }else if(mediaPlayer.isPlaying()){//正在播放音乐
   mediaPlayer.pause();
   //把图标改成播放的图标（暂停状态）
   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();
   while(seekBar.getProgress()<seekBar.getMax()){
    //获取当前音乐播放的位置
    int currentPosition=mediaPlayer.getCurrentPosition();
    //让进度条跟着时间走
    seekBar.setProgress(currentPosition);

   }
  }
 }


}

 <VideoView
  android:layout_width="match_parent"
  android:layout_height="300dp"
  android:id="@+id/vv_main_vedio"
  />

public class VedioActivity extends AppCompatActivity {

 private VideoView vv_main_vedio;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_vedio);
  vv_main_vedio = (VideoView) findViewById(R.id.vv_main_vedio);

  //给videoView设置播放来源
  vv_main_vedio.setVideoPath("file://mnt/sdcard/Movies/sister.mp4");

  //实例化媒体控制器
  MediaController mediaController=new MediaController(this);

  //给activity_vedio设置控制器
  vv_main_vedio.setMediaController(mediaController);

  mediaController.setMediaPlayer(vv_main_vedio);

 }
}