I have an extension to ImageView that I would like to draw by manually
altering the ImageMatrix. When I set the View's scaling type to
matrix however, changing the matrix has no effect on the image. If I
put it into a different mode, say center, changing the matrix does
change the display, but in some the matrix gets reset to the proper
value for center rather than what I want it to be, so I can't really
use a different mode as a workaround. Here's the code that changes
the matrix (the view implements OnGestureListener
public boolean onDown(MotionEvent e) {
Log.v(TAG, "onDown");
Matrix m = getImageMatrix();
Log.v(TAG, "Initial matrix: " + m.toString());
m.postScale(2.0f, 2.0f);
setImageMatrix(m);
Log.v(TAG, "New matrix: " + getImageMatrix().toString());
invalidate();
return true;
}
Here is what the log shows
V/Gesture-Enabled Image View( 3110): onDown
V/Gesture-Enabled Image View( 3110): Initial matrix: Matrix{[1.0, 0.0,
0.0][0.0, 1.0, 0.0][0.0, 0.0, 1.0]}
V/Gesture-Enabled Image View( 3110): New matrix: Matrix{[2.0, 0.0, 0.0]
[0.0, 2.0, 0.0][0.0, 0.0, 1.0]}
V/Gesture-Enabled Image View( 3110): onSingleTapUp
The display remains unchanged, though. How can I get the image to
change with the matrix?
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