I am trying to perform basic task of rotating a canvas 20 times a
second using timer but it doesn't seem to be working properly and its
lagging. for example, if I rotate rectangle 0.3 degrees per 50 ms it
should rotate 6 degree in on second, but that is not the case. It
really slow in rotation. Here is my sample code:
//Code for update task
class UpdateTimeTask extends TimerTask {
public void run() {
hndView.post(new Runnable() {
public void run() {
hndView.invalidate(); //this code invalidates
custom
view that calls onDraw to draw rotated hand
}
});
}
}
//Code for onDraw method of custom view that needs to be update
@Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
ang = ang + inc; //ang is angle to rotate and inc is float
value of
0.3 degree to be incremented
if (ang >= 360) ang = ang - 360;
canvas.rotate(ang, canvas.getWidth()/2, canvas.getHeight()/2);
canvas.drawRect((canvas.getWidth()/2 - 2),
(canvas.getHeight()/2 -
125), (canvas.getWidth()/2 + 2), (canvas.getHeight()/2 + 10),
mTextPaint);
canvas.restore();
}
//code to schedule task
Timer timer = new Timer();
UpdateTimeTask tt = new UpdateTimeTask();
timer.schedule(tt, 0, 50);
Can anyone please tell me what am I doing wrong here? Should I used
different approach to perform this task? Because its hard to believe
that you cannot have simple smooth rotation of rectangle 20 times in
one second.
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