surfaceView简单实用和medioVideo播放视频（本地＋网络）

最近要做视频直播类的app，之前基本没有接触过多媒体开发，在网上找了一些博客和代码看了下，慢慢入手。

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先从最基本的使用开始,功能包括
* 使用surfaceView在非主线程绘制界面
* 使用surfaceView和medioVideo播放本地和网络视频

先上效果图

绘制界面

播放视频

代码

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package com.tech.myapplication;
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import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
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import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
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public class MainActivity extends AppCompatActivity implements View.OnClickListener {
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   private SurfaceView surfaceView;
   private Button play;
   private MediaPlayer mediaPlay;
   private SurfaceHolder holder;
   private int possion = 0;
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   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       /**
         * 自定义surfaceView绘图，就调用下面
         */
//       setContentView(new MySurfaceView(this));
       /**
         * 用surfaceView播放视频
         */
       setContentView(R.layout.activity_main);
       initPlayView();
   }
​
   private void initPlayView() {
       this.surfaceView = (SurfaceView) findViewById(R.id.surface);
       this.play = (Button) findViewById(R.id.play);
       this.holder = surfaceView.getHolder();
       this.mediaPlay = new MediaPlayer();
       //设置播放时打开屏幕
       this.holder.setKeepScreenOn(true);
       this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
       this.holder.addCallback(new MyCallback());
       play.setOnClickListener(this);
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   }
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   public void play() throws IllegalArgumentException, SecurityException,
           IllegalStateException, IOException {
       mediaPlay.reset();
       mediaPlay.setAudioStreamType(AudioManager.STREAM_MUSIC);
       //本地路径视频
       String path = null;
       if (android.os.Environment.getExternalStorageState().
               equals(Environment.MEDIA_MOUNTED)){
           path = Environment.getExternalStorageDirectory().toString()+"/testfile.mp4";
       }
       mediaPlay.setDataSource("http://play13.68mtv.com/play13/60329.mp4");
       // 把视频输出到SurfaceView上
       mediaPlay.setDisplay(holder);
       //不要用prepareAsync,用了也报错,ERROR(-38,0)
       mediaPlay.prepare();
       mediaPlay.start();
   }
​
   @Override
   public void onClick(View view) {
       switch (view.getId()){
           case R.id.play:
               try {
                   play();
               } catch (IOException e) {
                   e.printStackTrace();
               }
               break;
       }
   }
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   private class MyCallback implements SurfaceHolder.Callback{
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       @Override
       public void surfaceCreated(SurfaceHolder surfaceHolder) {
           try {
               play();
               mediaPlay.seekTo(possion);
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
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       @Override
       public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
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       }
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       @Override
       public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
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       }
   }
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   @Override
   protected void onPause() {
       if (mediaPlay.isPlaying()) {
           // 保存当前播放的位置
           possion = mediaPlay.getCurrentPosition();
           mediaPlay.stop();
       }
       super.onPause();
   }
​
   @Override
   protected void onDestroy() {
       if (mediaPlay.isPlaying())
           mediaPlay.stop();
       mediaPlay.release();
       super.onDestroy();
   }
/***************************************************************/
​
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   class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback {
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       private SurfaceHolder holder;
       private Context context;
       private MyThread myThread;
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       public MySurfaceView(Context context) {
           super(context);
           this.context = context;
           this.holder = this.getHolder();
           this.holder.addCallback(this);
           this.myThread = new MyThread(holder);
       }
​
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       @Override
       public void surfaceCreated(SurfaceHolder surfaceHolder) {
           myThread.isRun = true;
           myThread.start();
       }
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       @Override
       public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
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       }
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       @Override
       public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
           myThread.isRun = false;
       }
   }
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   class MyThread extends Thread {
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       public boolean isRun;
       private SurfaceHolder holder;
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       public MyThread(SurfaceHolder holder) {
           this.holder = holder;
           isRun = true;
       }
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       @Override
       public void run() {
           super.run();
           int count = 0;
           while (isRun) {
               Canvas c = null;
               try {
                   synchronized (holder) {
                       c = holder.lockCanvas();//锁定画布，一般在锁定后就可以通过其返回的画布对象Canvas，在其上面画图等操作了。
                       c.drawColor(Color.GREEN);
                       Paint p = new Paint();
                       p.setColor(Color.WHITE);
                       Rect r = new Rect(100, 50, 300, 250);
                       c.drawRect(r, p);
                       p.setTextSize(40);
                       c.drawText("这是第" + (count++) + "秒", 100, 310, p);
                       Thread.sleep(1000);
                   }
               } catch (Exception e) {
                   e.printStackTrace();
               } finally {
                   if (c != null) {
                       holder.unlockCanvasAndPost(c);//结束锁定画图，并提交改变。
​
                   }
               }
           }
       }
   }
}
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