切换/前置摄像头飞 [英] switch back/front camera on fly

问题描述

如果我只用CAMERA_FACING_BACK或CAMERA_FACING_FRONT一切工作正常。 我有从CAMERA_FACING_BACK开关CAMERA_FACING_FRONT麻烦。 我的code段

 公共类PhotoCameraActivity扩展活动实现OnClickListener {
私人SurfaceView cameraView;
私人按钮turnButton;
私人相机拍照= NULL;
私人回调监听;
私有静态诠释CAMID = Camera.CameraInfo.CAMERA_FACING_BACK;

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.photo_camera_main）;
    prepareActivity（）;
}

私人无效prepareActivity（）{
    cameraView =（SurfaceView）findViewById（R.id.photo_camera_surface_view）;

    turnButton =（的ImageButton）findViewById（R.id.turn_button）;
    turnButton.setOnClickListener（本）;
}

@覆盖
公共无效的onClick（视图v）{
    如果（v.equals（turnButton））{
        { - 如果（1 Camera.getNumberOfCameras（）Camera.getNumberOfCameras（）→1＆安培;＆安培; CAMID＆公升）
            startCamera（CAMID + 1）;
        } 其他 {
            startCamera（Camera.CameraInfo.CAMERA_FACING_BACK）;
        }
    }
}

@覆盖
保护无效onResume（）{
    startCamera（CAMID）;
    super.onResume（）;
}

@覆盖
保护无效的onPause（）{
    stopCamera（）;
    super.onPause（）;
}

私人无效startCamera（INT cameraId）{
    如果（相机！= NULL）{
        stopCamera（）;
    }
    支架= cameraView.getHolder（）;
    监听=新的回调（）{

        @覆盖
        公共无效surfaceDestroyed（SurfaceHolder持有者）{
        }

        @覆盖
        公共无效surfaceCreated（SurfaceHolder持有者）{
            尝试 {
                camera.set previewDisplay（保持器）;
                camera.start preVIEW（）;
            }赶上（IOException异常E）{
                e.printStackTrace（）;
            }
        }

        @覆盖
        公共无效surfaceChanged（SurfaceHolder持有人，INT格式，诠释的宽度，高度INT）{}
    };
    holder.addCallback（听众）;


    CAMID = cameraId;
    摄像头= Camera.open（cameraId）;
    Camera.Parameters PARAMS = camera.getParameters（）;
    如果（cameraId == Camera.CameraInfo.CAMERA_FACING_BACK）{
        params.set previewSize（1280，800）;
    } 其他 {
        params.set previewSize（640，480）;
    }
    camera.setParameters（PARAMS）;

}

私人无效stopCamera（）{
    的System.out.println（stopCamera法）;
    如果（相机！= NULL）{
        camera.stop preVIEW（）;
        camera.set previewCallback（空）;
        camera.release（）;
        摄像头= NULL;
        holder.removeCallback（听众）;
        支架=无效;
    }
}

    }
 

解决方案

我重新启动与cameraId = 2的活动，这是工作。

If I use only CAMERA_FACING_BACK or CAMERA_FACING_FRONT all works fine. I have trouble with switch from CAMERA_FACING_BACK to CAMERA_FACING_FRONT. My code snippet

public class PhotoCameraActivity extends Activity implements OnClickListener {
private SurfaceView cameraView;
private Button turnButton;
private Camera camera = null;
private Callback listener;
private static int camId = Camera.CameraInfo.CAMERA_FACING_BACK;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.photo_camera_main);
    prepareActivity();
}

private void prepareActivity() {
    cameraView = (SurfaceView) findViewById(R.id.photo_camera_surface_view);

    turnButton = (ImageButton) findViewById(R.id.turn_button);
    turnButton.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    if (v.equals(turnButton)) {
        if (Camera.getNumberOfCameras() > 1 && camId < Camera.getNumberOfCameras() - 1) {
            startCamera(camId + 1);
        } else {
            startCamera(Camera.CameraInfo.CAMERA_FACING_BACK);
        }
    } 
}

@Override
protected void onResume() {
    startCamera(camId);
    super.onResume();
}

@Override
protected void onPause() {
    stopCamera();
    super.onPause();
}

private void startCamera(int cameraId) {
    if (camera != null) {
        stopCamera();
    }       
    holder = cameraView.getHolder();
    listener = new Callback() {

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            try {
                camera.setPreviewDisplay(holder);
                camera.startPreview();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int           width, int height) {}
    };
    holder.addCallback(listener);


    camId = cameraId;
    camera = Camera.open(cameraId);
    Camera.Parameters params = camera.getParameters();
    if (cameraId == Camera.CameraInfo.CAMERA_FACING_BACK) {
        params.setPreviewSize(1280, 800);
    } else {
        params.setPreviewSize(640, 480);
    }
    camera.setParameters(params);

}

private void stopCamera(){
    System.out.println("stopCamera method");
    if (camera != null){
        camera.stopPreview();
        camera.setPreviewCallback(null);
        camera.release();
        camera = null;
        holder.removeCallback(listener);
        holder = null;
    }
}

    }

解决方案

I restart Activity with cameraId = 2 and this is working.

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