后台服务中无摄像机视图的java opencv图像处理

Question

我想在安卓 studio中使用opencv创建一个用于图像处理的应用程序。我没有Android Java编码的经验。这就是为什么我想得到很多建议。当前项目是从服务中的相机图像（而不是主活动）接收帧，然后处理图像。这里的问题是后台服务必须能够进行图像处理。目前的型号是Nexus5。启动应用程序时，将显示摄像头图像。此时，如果执行home（主页）按钮或其他应用程序，则应在后台连续输入图像数据，并可进行图像处理。我现在有很多搜索结果，我得到的答案是surfacetexture可以做到这一点。但是，无论您如何使用surfacetexture运行其他应用程序，都可以在后台使用图像数据进行图像处理 我不知道我是否能做到这一点。以下是我的主要活动和服务

public class MainActivity extends Activity{
private static final String TAG = MainActivity.TAG;

private Camera mCamera;
public static TextureView mTextureView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mTextureView = new TextureView(this);
    setContentView(mTextureView);


    setContentView(R.layout.activity_main);
    startService(new Intent(this, VisionService.class));
}
}


public class VisionService extends Service implements TextureView.SurfaceTextureListener {

private static final String TAG = VisionService.class.getName();

private WindowManager windowManager;
private Camera mCamera = null;
private TextureView mTextureView;
private SurfaceTexture mSurfaceTexture;
private float[] mTransformMatrix;
public static Vibrator mVibrator;
private final IBinder mBinder = new LocalBinder();


@Override
public void onCreate() {
    super.onCreate();

    try {

        mTextureView = MainActivity.mTextureView;
        mTextureView.setSurfaceTextureListener(this);

        Log.i("ABC","onCreate");


    } catch (Exception e) {
        Log.i("ABC","onCreate exception "+e.getMessage());
        e.printStackTrace();
    }
    windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);


}

@Override
public void onDestroy() {
    super.onDestroy();
    Log.i(TAG, "surfaceDestroyed method");

}

public class LocalBinder extends Binder {
    VisionService getService() {
        // Return this instance of this service so clients can call public methods
        return VisionService.this;
    }
}//end inner class that returns an instance of the service.

@Override
public IBinder onBind(Intent intent) {

    return mBinder;
}//end onBind.

@Override
public void onSurfaceTextureAvailable(SurfaceTexture mSurfaceTexture, int width, int height) {
    mCamera = Camera.open(1);
    if (mCamera == null) {
        // Seeing this on Nexus 7 2012 -- I guess it wants a rear-facing camera, but
        // there isn't one.  TODO: fix
        throw new RuntimeException("Default camera not available");

    }
    try {
        mCamera.setPreviewTexture(mSurfaceTexture);

        mCamera.startPreview();
        mCamera.setPreviewCallback(new Camera.PreviewCallback() {

            @Override
            public void onPreviewFrame(byte[] data, Camera camera) {
                if (data == null) return;
                Camera.Size size = mCamera.getParameters().getPreviewSize();
                if (size == null) return;

                //This is where I start my thread that analyzes images
                Log.i("TAG","Hayoon");

            }
        });
    } catch (IOException ioe) {
        // Something bad happened
    }
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
    mCamera.stopPreview();
    mCamera.release();

    return true;
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}
}