将数据从SurfaceView检索到活动类

Question

我对Android开发很新，我正在尝试连接通过蓝牙发送数据的操纵杆。操纵杆位于SurfaceView中，我希望能够在Activity类中的操纵杆上检索x和y坐标上的数据，以便能够通过蓝牙发送数据。 我试图在网上查找类似的问题，但无法使其工作。

这是我在SurfaceView中的onDraw方法：

protected void onDraw(Canvas canvas, float x, float y, float zx, float zy){

    dx = x-zx;
    dy = y-zy;



    super.onDraw(canvas);



    canvas.drawRGB(255, 255, 255);
    canvas.drawBitmap(background, (canvas.getWidth() - canvas.getWidth() / 7) - background.getWidth() / 2, (canvas.getHeight() - canvas.getHeight() / 4) - background.getHeight() / 2, null);
    canvas.drawText(Float.toString(x), 60, 60, paint1);
    canvas.drawText(Float.toString(y), 60, 120, paint1);

    if (x == 0 && y == 0) {
        canvas.drawBitmap(ball, (canvas.getWidth()-canvas.getWidth() / 7) - ball.getWidth() / 2, (canvas.getHeight()-canvas.getHeight() / 4) - ball.getHeight() / 2, null);

    }
    else {
        canvas.drawBitmap(ball, x - ball.getWidth() / 2, y - ball.getHeight() / 2, null);
    }
}

它还运行AsyncTask：

public class MySurfaceThread extends AsyncTask<Void, Void, Void>{

    SurfaceHolder mSurfaceHolder;
    CustomSurfaceView cSurfaceView;


    public MySurfaceThread(SurfaceHolder sh, CustomSurfaceView csv){
        mSurfaceHolder = sh;
        cSurfaceView = csv;
        x = y = 0;

        cSurfaceView.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                x = event.getX();
                y = event.getY();
                System.out.println(x + " " + y);

                calculateValues(x,y);

                switch (event.getAction() & MotionEvent.ACTION_MASK){
                    case MotionEvent.ACTION_DOWN:
                        break;
                    case MotionEvent.ACTION_UP:
                        x = y = 0;
                        dx = dy = 0;
                        break;
                    case MotionEvent.ACTION_CANCEL:
                        break;
                }
                return true;
            }

            private float calculateValues(float xx, float yy){
                dx = xx-zeroX;
                dy = yy-zeroY;
                angle = (float)Math.atan(Math.abs(dy / dx));
                c = (float)Math.sqrt(dx * dx + dy * dy);

                if(c > radius){
                    if (dx > 0 && dy > 0) { //lower right corner
                        xx = (float) (zeroX + radius * Math.cos(angle));
                        yy = (float) (zeroY + radius * Math.sin(angle));
                    }
                    else if(dx > 0 && dy < 0){ //top right corner
                        xx = (float) (zeroX + radius * Math.cos(angle));
                        yy = (float) (zeroY - radius * Math.sin(angle));
                    }
                    else if(dx < 0 && dy < 0){ //top left corner
                        xx = (float) (zeroX - radius * Math.cos(angle));
                        yy = (float) (zeroY - radius * Math.sin(angle));
                    }
                    else if(dx < 0 && dy > 0){ //lower left corner
                        xx = (float) (zeroX - radius * Math.cos(angle));
                        yy = (float) (zeroY + radius * Math.sin(angle));
                    }
                }
                else {
                    xx = zeroX + dx;
                    yy = zeroY + dy;
                }
                System.out.println("dx: " + dx);
                System.out.println("dy: " + dy);
                System.out.println(angle);
                x = xx;
                y = yy;

            return angle;
            }
        });


    }

这是我的活动类。

public class SendInput extends Activity {

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice btDevice;
BluetoothSocket btSocket;
OutputStream os;
InputStream in;
private SensorManager mSensorManager;
private Sensor mAcc;
private int BTSTATE = 0, SensorStatus=0;
int MouseReq=0, read_values=0;
private static final UUID MY_UUID =UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");



protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final String address = getIntent().getStringExtra("address").trim();
    btDevice=btAdapter.getRemoteDevice(address);
    BluetoothConnect.start();
}

感谢我能得到的所有帮助。

提前致谢！