问题
I would like to start a timer that begins when a button is first pressed and ends when it is released (basically I want to measure how long a button is held down). I'll be using the System.nanoTime() method at both of those times, then subtract the initial number from the final one to get a measurement for the time elapsed while the button was held down.
(If you have any suggestions for using something other than nanoTime() or some other way of measuring how long a button is held down, I'm open to those as well.)
Thanks! Andy
回答1:
Use OnTouchListener instead of OnClickListener:
// this goes somewhere in your class:
long lastDown;
long lastDuration;
...
// this goes wherever you setup your button listener:
button.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
lastDown = System.currentTimeMillis();
} else if (event.getAction() == MotionEvent.ACTION_UP) {
lastDuration = System.currentTimeMillis() - lastDown;
}
return true;
}
});
回答2:
This will definitely work:
button.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN) {
increaseSize();
} else if (event.getAction() == MotionEvent.ACTION_UP) {
resetSize();
}
return true;
}
});
回答3:
- In onTouchListener start the timer.
- In onClickListener stop the times.
calculate the differece.
来源:https://stackoverflow.com/questions/11963763/how-to-detect-when-button-pressed-and-released-on-android