private void onTick() {
synchronized (this) {
Canvas canvas = this.lockCanvas();
if (canvas == null) return;
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
mDrawingList.addAll(mDisplayList);
Collections.sort(mDrawingList);
for (DisplayBase displayBase : mDrawingList) {
if (displayBase == null) {
continue;
}
displayBase.draw(canvas);
}
mDrawingList.clear();
this.unlockCanvasAndPost(canvas);
}
}
