ScaleGestureDetectorAndroid scale detectorAndroid drag and dropScaleGestureDetectorAndroid MotionEvent multi-touchAndroid gestureAndroid multi touch gesturesAndroid GestureDetector dragAndroid MotionEvent multi-touchAndroid GestureDetector exampleOnswipetouchlistenerAndroid handle touch eventAndroid gestureAndroid studio drag viewAndroid GestureDetector dragAndroid gesture sensor拖动和缩放| Android 开发者
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Save the ID of this pointer (for dragging) mActivePointerId = MotionEventCompat.getPointerId(ev, 0) } MotionEvent.ACTION_MOVE -> { 平台 AndroidStudio GooglePlay Jetpack
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