Continuously increase integer value as the button is pressed

Question

I\'m new to Android so sorry if the question is easy to answer. I have two buttons, a decrease and an increase button, and in the middle of them a TextView which displays a

Answer 1

Just wanna share my own solution that worked out for me really well.

First, create a handler in your activity

private Handler mHandler = new Handler();

Then, create the runnables that will increment/decrement and display your number. In here, we will check if your button is still in its pressed state and increment then re-run the runnable if it is.

private Runnable incrementRunnable = new Runnable() {
    @Override
    public void run() {
        mHandler.removeCallbacks(incrementRunnable); // remove our old runnable, though I'm not really sure if this is necessary
        if(IncrementButton.isPressed()) { // check if the button is still in its pressed state
            // increment the counter
            // display the updated value here, if necessary
            mHandler.postDelayed(incrementRunnable, 100); // call for a delayed re-check of the button's state through our handler. The delay of 100ms can be changed as needed.
        }
    }
}

Finally, use it in our button's onLongClickListener

IncrementButton.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View view) {
        mHandler.postDelayed(incrementRunnable, 0); // initial call for our handler.
        return true;
    }
});

That's it!

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Another way of doing it is declaring both the handler and runnable inside the OnLongClickListener itself although I myself am not sure if this is a good practice.

IncrementButton.setOnLongClickListener(new View.OnLongClickListener() {
    private Handler mHandler = Handler();
    private Runnable incrementRunnable = new Runnable() {
        @Override
        public void run() {
            mHandler.removeCallbacks(incrementRunnable);
            if(IncrementButton.isPressed()) {
                // increment the counter
                // display the updated value here, if necessary
                mHandler.postDelayed(incrementRunnable, 100);
            }
        }
    };

    @Override
    public boolean onLongClick(View view) {
        mHandler.postDelayed(incrementRunnable, 0);
        return true;
    }
});

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When doing this continuous increment, I would suggest to increase the increment value after a certain time/number of increments. E.g. If the number_of_increment made is less than 10, we increment by 1. Otherwise, we increment by 3.