Get pixel color in background on Android

Question

I need to create a service that keeps checking a coordinate of an android screen for the color of a pixel.

Eg.

Bitmap bitmap = ((BitmapDrawable)getBackground()).getBitmap();
int pixel = bitmap.getPixel(x,y);

if(pixel == Color.MAGENTA){
   //Stop Service
}

However instead of just my app, I need it to be in a background service which keeps checking for the color even when I switch apps.

Assuming the device is rooted, is there any superuser commands that does what I need?

Answer 1

To those who need to do something like I am doing,

I used the system's command /system/bin/screencap -p to capture the screen and check for the pixel on the screenshot.

This method requires the root permission

private void getPixelColor(int xcoord, int ycoord)
{
    try {
        Process sh = Runtime.getRuntime().exec("su", null,null);

        OutputStream os = sh.getOutputStream();
        os.write(("/system/bin/screencap -p " + "/sdcard/colorPickerTemp.png").getBytes("ASCII"));
        os.flush();

        os.close();
        sh.waitFor();

        Bitmap screen = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory() + File.separator + "colorPickerTemp.png");
        int pixel = screen.getPixel(xcoord ,ycoord + statusHeight);
        Log.d("pixel color", "Pixel Color: + " + Integer.toHexString(pixel) + " at x:" + xcoord + " y:" + ycoord);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}