如何在Android屏幕上获取所有触摸点的坐标

Question

Is there any way to get all touch points on Android screen? I am using MotionEvent to get coordinates when I touch parent layout and onTouchEvents when I touch some of the child elements. But I would like to use some third party library (if exist), that can return all touchings on screen without knowing what activity contains. I only need to get coordinates of all touchings on screen, but that library should impact the existing application functionalities. Is there any way to achieve this. Thanks!!!

Answer 1

You don't need any toolkit or library to get the coordinates. To get the coordinates of touch point on the screen, all you have to do is- getting X and Y value using MotionEvent object. I have used this code in my project for Camera focus and zooming purpose.

Just copy and paste below code in your activity code (Outside of onCreate() method) and check logcat:

@Override
public void onTouchEvent(MotionEvent event) {
    int pointerId = event.getPointerId(0);
    int pointerIndex = event.findPointerIndex(pointerId);
    // Get the pointer's current position
    float x = event.getX(pointerIndex);
    float y = event.getY(pointerIndex);
    System.out.println("X:"+x);
    System.out.println("Y:"+y);
}