Android中SurfaceView和普通view的区别及使用-Android-恩蓝网

1 SurfaceView介绍

在这里插入图片描述

回调函数的调用：
首次进入：
=surfaceCreated
=surfaceChanged
====draw
点击Home键：
=surfaceDestroyed

再次回到原来页面：
=surfaceCreated
=surfaceChanged
====draw

所以当SurfaceView不可见时会销毁SurfaceHolder，再次进入会重新调用surfaceCreated生成新的SurfaceHolder。surfaceChanged函数在surfaceCreated调用后该函数至少会被调用一次。

SurfaceView播放视频，不要忘记存储权限
mediaPlayer.setDisplay(getHolder());
视频资源为利用模拟器录制的mp4视频

public class SurfaceViewDemo2 extends SurfaceView implements SurfaceHolder.Callback{
    private SurfaceHolder mSurfaceHolder;
    private Canvas mCanvas;
    private Paint paint;
    private MediaPlayer mediaPlayer;

    public SurfaceViewDemo2(Context context) {
        this(context,null,0);
    }

    public SurfaceViewDemo2(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public SurfaceViewDemo2(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mSurfaceHolder = getHolder();
        mSurfaceHolder.addCallback(this);
        setFocusable(true);
        setFocusableInTouchMode(true);
        this.setKeepScreenOn(true);
        setZOrderOnTop(true);
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.RED);
        paint.setStrokeWidth(5);
        paint.setStyle(Paint.Style.STROKE);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        System.out.println("=========surfaceCreated========");
        new Thread(new Runnable() {
            @Override
            public void run() {
                //draw();
              play();
            }
        }).start();
    }

    private void draw() {

        try {
            System.out.println("============draw========");
            mCanvas = mSurfaceHolder.lockCanvas();
            mCanvas.drawCircle(500,500,300,paint);
            mCanvas.drawCircle(100,100,20,paint);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (mCanvas != null)
                mSurfaceHolder.unlockCanvasAndPost(mCanvas);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        System.out.println("=========surfaceChanged========");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        System.out.println("=========surfaceDestroyed========");
        if (mediaPlayer != null ){
            stop();
        }
    }


    protected void stop() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    protected void play() {
        String path = "/sdcard/DCIM/Camera/VID_20190110_102218.mp4";
        File file = new File(path);
        if (!file.exists()) {
            return;
        }
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                // 设置播放的视频源
                mediaPlayer.setDataSource(file.getAbsolutePath());
                // 设置显示视频的SurfaceHolder
                mediaPlayer.setDisplay(getHolder());

                mediaPlayer.prepareAsync();
                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

                    @Override
                    public void onPrepared(MediaPlayer mp) {
                        mediaPlayer.start();
                    }
                });
                mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        replay();
                    }
                });

                mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {

                    @Override
                    public boolean onError(MediaPlayer mp, int what, int extra) {
                        play();
                        return false;
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
    }

    protected void replay() {
        if (mediaPlayer!=null){
         mediaPlayer.start();
        }else{
            play();
        }
    }

    protected void pause() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
        }else{
            mediaPlayer.start();
        }
    }
}

补充对SurfaceView进行平移，旋转等操作

添加 mSurfaceView.scrollBy(10,10);
效果如下：完全没有效果

在这里插入图片描述

对包裹它的viewgroup添加缩放动画。

mContainer.animate().scaleX(0.4f).scaleY(0.7f);

在这里插入图片描述

此时拍摄出来的照片为：

在这里插入图片描述

拍摄出来的照片完全没有受缩放的影响。

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Android中SurfaceView和普通view的区别及使用

1 SurfaceView介绍

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