How to detect an additional finger on the screen? E.g. I touch the screen using one finger and after sometime I keep the first finger on screen and then touch the screen using other finger while keeping first finger as it is? How to detect the second finger touch in Touch Listener?How to detect an additional finger on the scree
阅读背景：
如何在Android touchlistener中同时检测到触摸屏幕上的次要手指？
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