I'm trying to detect fingers location on the screen within
onTouchListener. The location looks fine when only one finger is "on
touch". Touching with the other one causes somehow my first finger
location to be corrupted, shifted by some value. Below is an example
of the location log ([x, y]):
05-01 12:26:47.410: VERBOSE/TouchTest(8204): [58, 66]
05-01 12:26:47.960: VERBOSE/TouchTest(8204): [58, 67]
05-01 12:26:48.061: VERBOSE/TouchTest(8204): [58, 68]
05-01 12:26:48.070: VERBOSE/TouchTest(8204): [58, 69]
05-01 12:26:48.090: VERBOSE/TouchTest(8204): [58, 72] [392, 72]
05-01 12:26:48.100: VERBOSE/TouchTest(8204): [58, 73] [391, 74]
05-01 12:26:48.110: VERBOSE/TouchTest(8204): [58, 74] [391, 75]
05-01 12:26:48.121: VERBOSE/TouchTest(8204): [58, 75] [391, 76]
05-01 12:26:48.143: VERBOSE/TouchTest(8204): [58, 76] [391, 77]
05-01 12:26:48.170: VERBOSE/TouchTest(8204): [58, 77] [392, 78]
05-01 12:26:48.190: VERBOSE/TouchTest(8204): [58, 78] [392, 79]
05-01 12:26:48.230: VERBOSE/TouchTest(8204): [58, 79] [392, 80]
05-01 12:26:48.260: VERBOSE/TouchTest(8204): [58, 80] [392, 81]
05-01 12:26:48.320: VERBOSE/TouchTest(8204): [58, 81] [392, 82]
05-01 12:26:48.410: VERBOSE/TouchTest(8204): [58, 82] [393, 82]
05-01 12:26:48.510: VERBOSE/TouchTest(8204): [58, 82] [393, 81]
05-01 12:26:48.520: VERBOSE/TouchTest(8204): [58, 82] [393, 78]
05-01 12:26:48.531: VERBOSE/TouchTest(8204): [58, 77] [394, 73]
05-01 12:26:48.550: VERBOSE/TouchTest(8204): [58, 69] [394, 73]
05-01 12:26:48.570: VERBOSE/TouchTest(8204): [58, 68]
05-01 12:26:48.592: VERBOSE/TouchTest(8204): [58, 67]
05-01 12:26:48.730: VERBOSE/TouchTest(8204): [58, 66]
05-01 12:26:49.580: VERBOSE/TouchTest(8204): [58, 67]
05-01 12:26:49.640: VERBOSE/TouchTest(8204): [58, 68]
The code that creates the log above is:
StringBuilder message = new StringBuilder();
for (int i = 0; i < event.getPointerCount(); i++) {
float viewX = event.getX(i);
float viewY = event.getY(i);
if (i != 0)
message.append (' ');
message.append ('[');
message.append((int)viewX);
message.append (", ");
message.append((int)viewY);
message.append (']');
}
Log.v (
"TouchTest",
message.toString());
And I'm having problems with creating a view to control some car.
There are four areas on the image to choose left/right/forward/
backward and when only one area is touched it works great. Touching
another one causes misplaced X,Y coordinates for both of it. When I
release the first area suddenly second area is detected as being
touched. I've created dummy event.getXY(...) log to show that the
problem arises from MotionEvent data (or my understanding of it
contents) not area hit detection.
Thank you.
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