Well, I looked at that example again, and it doesn't use a separate
thread, just a Runnable (which they unhelpfully call a "task").
I hacked on the code a bit and got it down to a pretty tight set of
logic. This is it, including the lash-up to a SeekBar:
--- Logic in onCreate:
SeekBar weightSeekbar =
(SeekBar)findViewById(R.id.WeightSeekbar);
View decrementWeightOne = (View)
findViewById(R.id.DecrementWeightOne);
View incrementWeightOne = (View)
findViewById(R.id.IncrementWeightOne);
decrementWeightOne.setOnTouchListener(new
RepeatListener(weightSeekbar, 50, -1));
incrementWeightOne.setOnTouchListener(new
RepeatListener(weightSeekbar, 50, 1));
--- The real code:
private class RepeatListener implements OnTouchListener, Runnable {
private SeekBar seekBar;
private int period;
private int incDec;
private int downDuration;
public RepeatListener(SeekBar seekBar, int period, int incDec) {
this.seekBar = seekBar;
this.period = period;
this.incDec = incDec;
}
public boolean onTouch(View view, MotionEvent motionEvent) {
int action = motionEvent.getAction();
if (action == MotionEvent.ACTION_DOWN) {
Log.i("Repeat", "ACTION_DOWN");
downDuration = 0;
seekBar.incrementProgressBy(incDec);
handler.removeCallbacks(this);
handler.postDelayed(this, 200);
}
else if (action == MotionEvent.ACTION_UP) {
Log.i("Repeat", "ACTION_UP");
handler.removeCallbacks(this);
}
return false;
}
public void run() {
Log.i("Repeat", "run");
downDuration += period;
int increment = incDec;
// Increase increment size the longer the button's held
down
int halfSeconds = downDuration / 500;
int multiplier = halfSeconds + 1;
// Keep multiplier small relative to SeekBar range
int range = seekBar.getMax();
if (multiplier > range / 20) multiplier = range / 20;
increment *= multiplier;
seekBar.incrementProgressBy(increment);
handler.postDelayed(this, period);
}
}
--- That's it
You can play with the time delays in various ways, of course.
On Oct 5, 3:42 pm, DanH <[email protected]> wrote:
> I tried it using Messages rather than a separate thread, and it seems
> to work. Essentially the same code, only the "run" routine in the
> Runnable becomes a handleMessage routine in a subclass of Handler, and
> you substitute the "send" methods in place of the "post" ones. Seems
> wiser to me, since it keeps all the GUI actions in the main thread.
>
> On Oct 5, 1:56 pm, DanH <[email protected]> wrote:
>
> > One problem we're seeing with the scheme is that the count that's
> > being incremented "jumps" on press and release for some reason. [Late
> > breaking news: That was a finger malfunction.]
>
> > Also, I wonder if the separate thread is necessary -- couldn't one
> > just send a Message to one's own thread with sendMessageAtTime or
> > sendMessageDelayed?
>
> > On Oct 5, 1:01 pm, Kumar Bibek <[email protected]> wrote:
>
> > > This is ok I guess. You can optimize it or may be change a few things
> > > according to your needs.
>
> > > -Kumar Bibekhttp://techdroid.kbeanie.com
>
> > > On Tue, Oct 5, 2010 at 11:28 PM, DanH <[email protected]> wrote:
> > > > How does one create an auto-repeat Button on Android. I found this:
>
> > > >http://groups.google.com/group/android-developers/browse_thread/threa...
>
> > > > But it seems kind of heavyweight and clumsy. Is there a better way?
> > > > (One would think that this would be a built-in capability like it is
> > > > on most other UIs.)
>
> > > > --
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>
> > > --
> > > Kumar Bibek
> > > Mobile : +91-9663304186
> > > Mail : [email protected]
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