Game Development Reference
In-Depth Information
9.
At the end, we update the coordinates of each touch point:
if ( E == MotionEvent.ACTION_MOVE )
{
for ( int i = 0; i != cnt; i++ )
SendMotion(
event.getPointerId(i),
(int)event.getX(i),
(int)event.getY(i),
true, MOTION_MOVE );
}
}
10. When everything is done, we inform our native gesture decoder about the end of the
events sequence:
SendMotion( MOTION_END, 0, 0, false, MOTION_MOVE );
return E <= MotionEvent.ACTION_MOVE;
}
11. The native SendMotion() function accepts the touch point ID , the coordinates in
screen pixels, a motion lag, and a boolean parameter indicating whether the touch
point is active:
public native static void SendMotion( int PointerID, int x, int y,
boolean Pressed, int Flag );
How it works...
The Android OS sends the notiications about touch points to our application, and the
onTouchEvent() function transforms the collection of touch events which resides
within a MotionEvent object into a sequence of JNI SendMotion() calls.
See also
F Handling multi-touch events on Windows
F Recognizing gestures
 
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