SurfaceView预览camera

SurfaceView 预览Camera
实现步骤

1.增加权限

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

2.动态申请权限

//检查访问摄像头权限
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 100);
} else {
    //拥有权限
    initCameraView();
}

3.为SurfaceView的SurfaceHolder增加回调

类中要实现回调 implements SurfaceHolder.Callback

private void initCameraView() {
    surfaceView = findViewById(R.id.surfaceview);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(this);
}

4.Camera相机初始化并关联SurfaceHolder

记得加上这句camera.startPreview()

  @Override
    public void surfaceCreated(final SurfaceHolder holder) {

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    if (camera == null)
                        camera = Camera.open(1);
                    camera.setPreviewDisplay(holder);
                    camera.setPreviewCallback(new Camera.PreviewCallback() {
                        @Override
                        public void onPreviewFrame(byte[] data, Camera camera) {
                        }
                    });
                    camera.setDisplayOrientation(90);
                    camera.startPreview();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }

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

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }