[移动开发]【Android】获取控件坐标值

1. 获取手指触摸点的坐标

        binding.view.setOnTouchListener { _, motionEvent ->
            if(motionEvent.action == MotionEvent.ACTION_MOVE) {
                binding.textShow.text = "x:  " + motionEvent.x + "  ,y: " + motionEvent.y
            }
            return@setOnTouchListener true
        }

2. 获取设备的分辨率

binding.textDevice.text =
    "heightPixels: " + resources.displayMetrics.heightPixels + " , widthPixels: " + resources.displayMetrics.widthPixels +
    " ,densityDpi: " + resources.displayMetrics.densityDpi + " ,densityDpi: " + resources.displayMetrics.density + 
    " ,scaledDensity: " + resources.displayMetrics.scaledDensity

heightPixels: 1920 , widthPixels: 1080 ,densityDpi: 480 ,densityDpi: 3.0 ,scaledDensity: 3.0

3. How to get the absolute coordinates of a view in Android?
   如何获取控件的绝对坐标？

        var location = IntArray(2)
        binding.imageView2.getLocationOnScreen(location)
        binding.textDevice.text = "location[0]: " + location[0] + ", location[1]: " + location[1]

要延时获取，在onCreate获取到的数据均为0
location[0]: 360, location[1]: 773 图片所在的左上角的绝对坐标值

可以创建个通用的接口

    fun getLocationOnScreen(view: View): Point {
        val location = IntArray(2)
        view.getLocationOnScreen(location)
        return Point(location[0], location[1])
    }

4. 代码中获取控件的宽高，结果是px像素值

var rect = Rect()
binding.homeTop.getLocalVisibleRect(rect)
//binding.homeTop.getGlobalVisibleRect(rect)
binding.textDevice.text = "bottom: " + rect.bottom + ", top: " + rect.top + ", left: " + rect.left +
                        ", right: " + rect.right + ", height: " + rect.height() + ", width: " + rect.width()

图片分辨率为120x91px，放在drawable目录下，且要延时获取，在onCreate获取到的数据均为0
getGlobalVisibleRect: rect.bottom: 1278, top: 228, height: 1050, left: 0, right: 1080, width: 1080
getLocalVisibleRect: rect.bottom: 1050, top: 0, height: 1050, left: 0, right: 1080, width: 1080

注意:
以上方法在OnCreate方法中调用,都会返回0,这是因为View还未加载完毕.
建议在onWindowFocusChanged方法中进行获取,有些情况下onWindowFocusChanged不好用的时候(比如ActivityGroup),可以这样写:

        binding.fragmentHomeTop.homeTop.post {
            initSystem()
            initBehavior()
        }

参考链接：
android 获取控件的宽高和view的位置