子线程之光：优化VideoView, SurfaceView, MediaPlayer与MediaRecorder的性能

系统教程30 更新时间：2026-04-03 21:49:10

1:VideoView

video = (VideoView)findViewById(R.id.videoView);
video.setVideoURI(Uri.fromFile(new File("/storage/emulated/0/video/banana.mp4")));
video.setMediaController(new MediaController(this));
video.start();

<VideoView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="@+id/videoView"
/>

Video
// video.getCurrentPosition();
// video.getDuration();
// video.seekTo(0);
// video.start();
// video.pause();

2: 网络请求：
video.setVideoURI(Uri.parse(""));

<uses-permission android:name="android.permission.INTERNET"/>

其实VideoView 是封装了MediaPlayer。
----------------------------------------------------
其实VideoView 就是MediaPlayer 和SurfaceView 来做的。
其实是视频就是音频和图像的结合。所以可以理解为MediaPlayer和SurfaceView 来做的。
----------------------------------------------------

3:SurfaceView主要用于两个方面，用于游戏，用于视频的播放。
摄像头也是相当于视频播放，只是视频的来源不同。
SurfaceView 也可以用来进行绘制，但是绘制的效率比普通的View 要高，
但是比GLSurfaceView的绘制效率要低。
GL主要用于3D的绘制的。
现在SurfaceView 只是用于进行视频的播放

使用SurfaceView 做一个画板
可以在子线程中绘制。
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各自有两个优点，又有两个缺点。所以Surface
SurfaceView View
绘制效率高绘制效率低
可以在子线程中绘制只能在UI线程中绘制。

不可配置自定义的View 可以有自定义的属性的，是可配置的。
复用性弱复用性强，可以直接拷贝过去用。
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4：Holder 的翻译就是持有人的意思

surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceView.getHolder().addCallback(this);

继承3个方法：
@Override
public void surfaceCreated(SurfaceHolder holder) {
//例如游戏开始之后开始处理线程。
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
//一开始的时候就会调用一次。宽和高有可能在运行当中发生改变，一旦改变了，例如横竖屏切换，调用这个方法
//我们可以知道新的宽高是什么。
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}

使用SurfaceView 做一个画板，可以在子线程中绘制。子线程中绘制，子线程中绘制。

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {

private VideoView video;
private SurfaceView surfaceView;
private Thread thread;
private DrawRunable runnable;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// video = (VideoView)findViewById(R.id.videoView);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceView.getHolder().addCallback(this);
runnable = new DrawRunable(surfaceView.getHolder());
surfaceView.setOnTouchListener(runnable);

// video.setVideoURI(Uri.fromFile(new File("/storage/emulated/0/video/banana.mp4")));
// video.setVideoURI(Uri.parse(""));
// video.setMediaController(new MediaController(this));
// video.start();
// video.getCurrentPosition();
// video.getDuration();
// video.seekTo(0);
// video.start();
// video.pause();
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
// runnable = new DrawRunable(holder);
thread = new Thread(runnable);
thread.start();
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
runnable.setRun(false);
}

public static class DrawRunable implements Runnable, View.OnTouchListener {
private SurfaceHolder holder;
private boolean isRun;
private Paint paint;
private Path path;

public DrawRunable(SurfaceHolder holder) {
this.holder = holder;
isRun=true;
paint=new Paint();
path = new Path();
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5);
}

@Override
public void run() {
while(isRun){
Canvas canvas = holder.lockCanvas();//得到锁定的画布，但是这个画布有可能为空
//当SurfaceView没有创建成功的时候有可能为空。
if(canvas!=null){
canvas.drawColor(0xFF000000);//先用黑色把这个图全部染掉
canvas.drawPath(path,paint);

holder.unlockCanvasAndPost(canvas);
}
}
}

public void setRun(boolean run){
isRun=run;
}

@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
path.moveTo(event.getX(),event.getY());
break;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
path.lineTo(event.getX(),event.getY());
break;
}
return true;
// return false;
}
}
}

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5：MediaPlayer 和 SurfaceView 一起用：
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {

private SurfaceView surfaceView;
private MediaPlayer mediaPlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceView.getHolder().addCallback(this);
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource("/storage/emulated/0/video/banana.mp4");
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
mediaPlayer.setDisplay(holder);
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}
}

-----------------------------------------------------------------------------

6：如果是网络加载：
因为是网络所以需要异步加载，而且需要调用onPrepared方法来处理加载完后的start的操作。
mediaPlayer.setOnPreparedListener(this);

同时设置：surfaceView 的大小为视频的原始尺寸大小：
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener {

private SurfaceView surfaceView;
private MediaPlayer mediaPlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
surfaceView.getHolder().addCallback(this);
mediaPlayer = new MediaPlayer();
try {
// mediaPlayer.setDataSource("/storage/emulated/0/video/banana.mp4");
mediaPlayer.setDataSource("");
// mediaPlayer.prepare();
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.prepareAsync();
// mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
mediaPlayer.setDisplay(holder);
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}

@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
ViewGroup.LayoutParams layoutParams = surfaceView.getLayoutParams();
layoutParams.height=mediaPlayer.getVideoHeight();
layoutParams.width=mediaPlayer.getVideoWidth();
surfaceView.setLayoutParams(layoutParams);
}

}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

添加了播放和暂停已经停止的按钮：

<RelativeLayout xmlns:android=""
xmlns:tools="" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
    <LinearLayout xmlns:android=""
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
        <SurfaceView
android:id="@+id/surfaceView"
android:layout_width="fill_parent"
android:layout_height="300dp" />
        <LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal" >
            <ImageButton
android:id="@+id/btnplay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btnPlay"
android:src="@drawable/play" />
            <ImageButton
android:id="@+id/btnpause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btnPause"
android:src="@drawable/pause" />
            <ImageButton
android:id="@+id/btnstop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/stop"
android:onClick="btnStop"/>
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener {
    ImageButton btnplay, btnstop, btnpause;
    SurfaceView surfaceView;
    MediaPlayer mediaPlayer;
    int position;
    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        surfaceView.getHolder().addCallback(this);
        mediaPlayer = new MediaPlayer();
        try {
            //本地的视频
//            mediaPlayer.setDataSource("/storage/emulated/0/video/banana.mp4");
//            mediaPlayer.prepare();
//            mediaPlayer.start();
            //网络请求的
mediaPlayer.setOnPreparedListener(this);
            mediaPlayer.setDataSource("");
            mediaPlayer.prepareAsync();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    @Override
public void surfaceCreated(SurfaceHolder holder) {
        //下面的如果不设置那么就会没有显示的视频了
mediaPlayer.setDisplay(holder);
    }
    @Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }
    @Override
public void surfaceDestroyed(SurfaceHolder holder) {
    }
    @Override
public void onPrepared(MediaPlayer mp) {
        mediaPlayer.start();
//        ViewGroup.LayoutParams layoutParams = surfaceView.getLayoutParams();
//        layoutParams.height=mediaPlayer.getVideoHeight();
//        layoutParams.width=mediaPlayer.getVideoWidth();
//        surfaceView.setLayoutParams(layoutParams);
}
    public void btnPause(View view) {
        mediaPlayer.pause();
    }
    public void btnPlay(View view) {
            mediaPlayer.start();
    }
    public void btnStop(View view) {
//        mediaPlayer.stop();
mediaPlayer.pause();
        mediaPlayer.seekTo(0);
    }
}

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本文发布于:2026-03-12，感谢您对本站的认可！

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子线程之光：优化VideoView, SurfaceView, MediaPlayer与MediaRecorder的性能

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