How would I go about implementing a fast incrementation when I hold on a button in an Android Activity. So for example when I hold on a button, a number that I have already set in an EditText increases at a fast pace.
Your help would be most appreciated.
Well, I would use a System.currentTimeMillis() inside the onTouch method. In the case TouchEvent.ACTION_DOWN: start the millis count (use your custom math function to use milliseconds) and stop the count in the TouchEvent.ACTION_UP.
You can extend the TimerTask class and override the "run" method with what you want to do. In this case, "run" would increment your EditText's text. Then just make a Timer and give it your overloaded TimerTask class.
Example:
import java.util.TimerTask;
public class MyTask extends TimerTask {
private Integer mIncrement = 0;
public MyTask() {
}
@Override
public void run() {
mIncrement++;
// Then notify the GUI somehow (Maybe with a Handler)
}
}
Now you just need to schedule "MyTask" to run when your button is down:
mButton.setOnTouchListener(
new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getPointerCount() > 0 && !mIncrementing) {
mIncrementing = true;
MyTask task = new MyTask();
mTimer = new Timer();
mTimer.scheduleAtFixedRate(task, 0, 10);
} else {
mIncrementing = false;
mTimer.cancel();
}
return true;
}
}
);
I hope this helps. For more information, see the documentation on Timer: http://developer.android.com/reference/java/util/Timer.html
Also, you may notice you can't set your EditText's text value from within MyTask.run. This is because Android doesn't allow cross-thread access to GUI elements. To update your EditText, you need to pass a message with a Handler to tell the main thread to update its value.
