I have an activity which has a ProgressBar. This bar is used to show the elapsed time on the game level.
I'm updating this bar and a TextView with a CountdownTimer, called every 100ms. The problem is that every time I call setProgress, it seems to be causing an invalidate() that makes my whole UI to be redrawn. If I delete the line where the ProgressBar get updated everything works fine, even setText for the TextView that show the time left.
This is a problem for me because I also have a custom view which needs to be redrawn only when I need it, or at least a few times but not constantly because it'll affect performance.
This is a piece of my code:
private CountDownTimer timer;
private long ttime;
private long ctime;
private ProgressBar bar;
private TextView clock;
@Override
protected void onCreate(Bundle savedInstanceState) {
...
startTimer(500);
...
}
@Override
protected void onResume() {
super.onResume();
if(!checkFlags()){
startTimer(500);
}
}
@Override
protected void onPause() {
super.onPause();
if(!checkFlags()){
timer.cancel();
}
}
private void startTimer(long delay){
timer = new CountDownTimer(ctime,100){
public void onTick(long millisUntilFinished){
ctime = millisUntilFinished;
clock.setText(formatTime(millisUntilFinished));
bar.setProgress((int) (1000 - ((ctime * 1000)/ttime)));
}
public void onFinish(){
clock.setText("00:00");
gameOver(false);
}
};
if(delay > 0){
Handler handler = new Handler();
handler.postDelayed(new Runnable(){
public void run(){
timer.start();
}
},delay);
}else{
timer.start();
}
}
How could I prevent the ProgressBar to cause this onDraw calls for every element of the UI?
