Updating fragment every 30 seconds

Question

I currently have a fragment that generates an ImageView. I am in search of a way to be able to update the imageview that is generated every 30 seconds. The imageview uses other functions to help generate it. Thanks for any help.

 ImageView imageView = (ImageView) rootView.findViewById(R.id.qrCode);
 try {
        Bitmap bitmap = encodeAsBitmap(STR);
        imageView.setImageBitmap(bitmap);
    } catch (WriterException e) {
        e.printStackTrace();
 }

Answer 1

You can use the Handler class from the android.os for periodic updates on whatever.

Example code here:

final Handler refreshHandler = new Handler();
Runnable runnable = new Runnable() {
                @Override
                public void run() {
                    // do updates for imageview
                    refreshHandler.postDelayed(this, 30 * 1000);
                }
            };
refreshHandler.postDelayed(runnable, 30 * 1000);