（视频播放）默认播放 ，VideoView， MediaPlay

默认播放器

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VideoView

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MediaPlayer
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默认系统：
MainActivity*******************
···
// SD卡 系统播放 对SD卡操作 加权限
findViewById(R.id.bt_1).setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            //Environment.getExternalStorageDirectory() 获取sd卡的路径
      //Toast.makeText(MainActivity.this, Environment.getExternalStorageDirectory()+"", Toast.LENGTH_SHORT).show(); 
      Uri uri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/gaobaiqiqiu.mp4"));
        //网络
    //Uri uri = Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(uri, "video/mp4");
        startActivity(intent);
        
        }
    });

···
VideoView ：
布局中定义一个VideoView控件
XML
···
<Button
android:id="@+id/bt_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="播放视频" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<VideoView
android:id="@+id/video_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"

  />

</LinearLayout>
···
MainActivtiy中：
···

    videoView = (VideoView) findViewById(R.id.video_id);
    findViewById(R.id.bt_2).setOnClickListener(new OnClickListener() {
        
        @Override
        public void onClick(View v) {
            //1.播放资源路径
        //  Uri uri = Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
            Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/gaobaiqiqiu.mp4");
            //2.给videoView设置路径
            videoView.setVideoURI(uri);
            //设置进度条
            videoView.setMediaController(new MediaController(MainActivity.this));
            
            videoView.start();
        
        }
    });

···
MediaPlayer
布局中定义一个SurfaceView
···
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >

<SurfaceView
android:id="@+id/sv_id"
android:layout_width="match_parent"
android:layout_height="400dp"
/>
<Button
android:id="@+id/bt_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="播放" />
<Button
android:id="@+id/bt_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="暂停" />

</LinearLayout>

···

MainActivity中
···
package com.example.ytest7_mediaplayer;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {

private SurfaceView sv;
private SurfaceHolder holder;
private int currentPosition;
private MediaPlayer mediaPlayer;
private boolean play=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  sv = (SurfaceView) findViewById(R.id.sv_id);
  holder = sv.getHolder();
  mediaPlayer = new MediaPlayer();
  holder.addCallback(new Callback() {

    @Override//SurfaceView创建
    public void surfaceCreated(SurfaceHolder holder) {
        Log.e("TAG", "surfaceCreated");
        mediaPlayer.setDisplay(holder);//开启画面
        mediaPlayer.start();
        mediaPlayer.seekTo(currentPosition);//滑动到上次记录的位置

// if (play==false) {
// //创建mediaPlayer
// mediaPlayer = new MediaPlayer();
// mediaPlayer.reset();
// try {
// mediaPlayer.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/gaobaiqiqiu.mp4");
// //准备
// mediaPlayer.prepare();
// mediaPlayer.setDisplay(holder);//开启画面
// mediaPlayer.start();
//
// } catch (Exception e) {
// e.printStackTrace();
// }
// play=true;
//
// }else{
// mediaPlayer.setDisplay(holder);//界面
// mediaPlayer.start();
// mediaPlayer.seekTo(currentPosition);
// }

    }

    @Override//SurfaceView发生改变
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        Log.e("TAG", "surfaceChanged");
    }

    @Override  //SurfaceView销毁时
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.e("TAG", "surfaceDestroyed");
        if (mediaPlayer!=null) {
            mediaPlayer.pause();//可以继续播放
            currentPosition = mediaPlayer.getCurrentPosition();//记录当前播放的位置
        
        }
    }
});
  
  //播放
  findViewById(R.id.bt_1).setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        if (play==false) {
            //创建mediaPlayer
            mediaPlayer = new MediaPlayer();
            mediaPlayer.reset();
            try {
            mediaPlayer.setDataSource(Environment.getExternalStorageDirectory().getPath()+"/gaobaiqiqiu.mp4");
            //准备
            mediaPlayer.prepare();
            mediaPlayer.setDisplay(holder);//开启画面
            mediaPlayer.start();
            
            } catch (Exception e) {
                e.printStackTrace();
            } 
            play=true;
        
        }else{//继续播放时
            mediaPlayer.setDisplay(holder);//界面
            mediaPlayer.start();
            mediaPlayer.seekTo(currentPosition);
        }
    }
});
//暂停
  findViewById(R.id.bt_2).setOnClickListener(new OnClickListener() {
    
    @Override
    public void onClick(View v) {
        if (mediaPlayer!=null) {
            mediaPlayer.pause();//可以继续播放
            currentPosition = mediaPlayer.getCurrentPosition();
           
        }
    }
});
}

}

···