Question

I am trying to update a TextView which will show the system volume. I have managed to capture the current system volume and display it, but it doesn’t update when the volume is turned up/down (obviously).

I know there is an easy solution somewhere I just cant think! onKeyListeners?

I am now using this but it doesnt work:

TextView sysVol = (TextView)findViewById(R.id.systemVolume);        
    sysVol.setOnKeyListener(new OnKeyListener()
    {                           
        public boolean onKey(View v, int keyCode, KeyEvent event) {
              if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {

                //system volume
                int curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
                int i = curVolume * 4;  
                String aString = Integer.toString(i);   

                TextView sysVol = (TextView)findViewById(R.id.systemVolume);
                sysVol.setText(aString);

                return true;
            }
                return false;
        }
    });

Answer 1

Well, the pseudo approach would be the following scenario:

1) Attach a listener to the view
2) Filter the different events in the callback
3) Update the TextView upon the (event==volume_up OR event==volume_down)

Basically, you’d want to implement the View.onKey()-method for this to be a minor bump in the road, instead of the current roadblock-state.

Summary: Add the following snippet to your code (some modification needed)

public YourClassHere extends SomethingCool implements OnKeyListener /*<-- important part*/
{
    public boolean onKey(View v) {
      // do something when the selected button is pushed
      return true;
    }
}