Detect two hardware button press simultaneously

Question

I want to add listener when my two hardware button presses like volume button and power button. But i came to know that you can\'t override power button. Actually i want to

Answer 1

You need override onKeyDown and onKeyUp events to detect two buttons pressed.

 public boolean first,second;

 public boolean onKeyDown(int keyCode, KeyEvent event) {

    if (keyCode == KeyEvent.KEYCODE_POWER){
        first = true;
    }
    else if(keyCode == KeyEvent.KEYCODE_VOLUME_UP){
        second = true;
    }

    if(first && second) {
        // Two buttons pressed, Do your stuff
    }
    return true;
 }

 public boolean onKeyUp(int keyCode, KeyEvent event) {

    if (keyCode == KeyEvent.KEYCODE_POWER){
        first = false;
    }
    else if(keyCode == KeyEvent.KEYCODE_VOLUME_UP){
        second = false;
    }
    return true;
 }

Answer 2

In your Activity. Try below code for Volume UP + Power key. You can reduce PRESS_INTERVAL to get effect like both buttons are pressed at the same time. Hope This Helps!

private static final int PRESS_INTERVAL = 700;
private long mUpKeyEventTime = 0;
public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (KeyEvent.KEYCODE_POWER == event.getKeyCode()) {            
            if ((event.getEventTime() - mUpKeyEventTime) < PRESS_INTERVAL) {
                // This is to check if Volume UP key and Power key are pressed at the same time.
                // Do the Task. Here You can add logic to take screenshot
            }
            return true;
        } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if(KeyEvent.KEYCODE_VOLUME_UP == keyCode){
            mUpKeyEventTime = event.getEventTime();
        }
        return super.onKeyUp(keyCode, event);
    }