Android 3 finger touch detection

问题

I am successfully able to record the coordinates of the two fingers being touched on the screen using the following code:

case MotionEvent.ACTION_MOVE:
Log.d("TOUCH", "test ACTION MOVE" + event.getPointerCount());
Log.d("TOUCH", "test ACTION MOVE ID" + event.getPointerId(0) + " "+event.getPointerId(1));
if(event.getPointerCount()==3)
{

x0 = (int) event.getX(event.getPointerId(0));
y0 = (int) event.getY(event.getPointerId(0));
x1 = (int) event.getX(event.getPointerId(1));
y1 = (int) event.getY(event.getPointerId(1));
x2 = (int) event.getX(event.getPointerId(2));
y2 = (int) event.getY(event.getPointerId(2));

Log.d("TOUCH", "test ACTION DOWN " + " values = " + x0 + " " + y0 + " "
+ x1 + " " + y1+ " "+x2 + " " + y2);
}

But In the above code im not able to detect more then 2 touch points at a single instance. Even the pointerCount() never goes above 2.

How can I get the touch coordinates for more then 2 fingers? Im running this code on Android 2.2

回答1:

This was asked some time ago, but anyway. The answer is that although android could track 256 fingers, the current implementation limits this to 2 fingers.

I'm not sure about honeycomb, but I guess that it has the same "issue".

回答2:

I've confirmed 4 touches on some Android 2.3.5 devices, and every 3.x and 4.x device I've tested so far. It seems that at least from API 8+, more than two touches is supported, but it's device-dependent.

回答3:

multitouch which uses more than two fingers can only be performed in android 4.1.2 version or above and also different companies have customized the android versions according to their needs and apps i.e in 4.1.2 version the Qmobile just support five fingures but the great samsung company uses more than 11 fingers

回答4:

     firstFingerX = MotionEventCompat.getX(ev, 0); firstFingerY = MotionEventCompat.getY(ev, 0);
 if (numberOfFingers == 2) {
     Log.e("mine", "Integer: " + String.valueOf((int)MotionEventCompat.getY(ev, 1)));
     secondFingerX = MotionEventCompat.getX(ev, 1); secondFingerY = MotionEventCompat.getY(ev, 1);
 }
 if (numberOfFingers == 3) {
     Log.e("mine", "Integer: " + String.valueOf((int)MotionEventCompat.getY(ev, 2)));
     thirdFingerX = MotionEventCompat.getX(ev, 2); thirdFingerY = MotionEventCompat.getY(ev, 2);

 }

来源：https://stackoverflow.com/questions/5893336/android-3-finger-touch-detection

标签

android

multi-touch