Android: Multiple simultaneous count-down timers in a ListView

Question

I am creating an app that requires a ListView with an undetermined number of elements, each of which has a timer that counts down from a variable number. I am able to succes

Answer 1

Please have a look here at my blog where you will find an example on how to achieve this.

One solution is to put the TextView that represents each counter into a HashMap together with it's position in the list as the key.

In getView()

TextView counter = (TextView) v.findViewById(R.id.myTextViewTwo);
if (counter != null) {
    counter.setText(myData.getCountAsString());
    // add the TextView for the counter to the HashMap.
    mCounterList.put(position, counter);
}

Then you can update the counters by using a Handler and where you post a runnable.

private final Runnable mRunnable = new Runnable() {
    public void run() {
        MyData myData;
        TextView textView;

        // if counters are active
        if (mCountersActive) {                
            if (mCounterList != null && mDataList != null) {
                for (int i=0; i < mDataList.size(); i++) {
                    myData = mDataList.get(i);
                    textView = mCounterList.get(i);
                    if (textView != null) {
                        if (myData.getCount() >= 0) {
                            textView.setText(myData.getCountAsString());
                            myData.reduceCount();
                        }
                    }
                }
            }
            // update every second
            mHandler.postDelayed(this, 1000);
        }
    }
};