private static class CupcakeDetector extends VersionedGestureDetector { float mLastTouchX; float mLastTouchY; float getActiveX(MotionEvent ev) { return ev.getX(); } float getActiveY(MotionEvent ev) { return ev.getY(); } boolean shouldDrag() { return true; } @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: { mLastTouchX = getActiveX(ev); mLastTouchY = getActiveY(ev); break; } case MotionEvent.ACTION_MOVE: { final float x = getActiveX(ev); final float y = getActiveY(ev); if (shouldDrag()) { mListener.onDrag(x - mLastTouchX, y - mLastTouchY); } mLastTouchX = x; mLastTouchY = y; break; } } return true; } } private static class EclairDetector extends CupcakeDetector { private static final int INVALID_POINTER_ID = -1; private int mActivePointerId = INVALID_POINTER_ID; private int mActivePointerIndex = 0; @Override float getActiveX(MotionEvent ev) { return ev.getX(mActivePointerIndex); } @Override float getActiveY(MotionEvent ev) { return ev.getY(mActivePointerIndex); } @Override public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getAction(); switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: mActivePointerId = ev.getPointerId(0); break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: mActivePointerId = INVALID_POINTER_ID; break; case MotionEvent.ACTION_POINTER_UP: final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; final int pointerId = ev.getPointerId(pointerIndex); if (pointerId == mActivePointerId) { // This was our active pointer going up. Choose a new // active pointer and adjust accordingly. final int newPointerIndex = pointerIndex == 0 ? 1 : 0; mActivePointerId = ev.getPointerId(newPointerIndex); mLastTouchX = ev.getX(newPointerIndex); mLastTouchY = ev.getY(newPointerIndex); } break; } mActivePointerIndex = ev.findPointerIndex(mActivePointerId); return super.onTouchEvent(ev); } } private static class FroyoDetector extends EclairDetector {