View value of Password EditText while a button is pressed

yourButton.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {

               switch ( event.getAction() ) {
                case MotionEvent.ACTION_DOWN: 
                   editText.setInputType(InputType.TYPE_CLASS_TEXT);
                break;
                case MotionEvent.ACTION_UP: 
                    editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
                break;
                }
                return true;
        }
    });

References
https://stackoverflow.com/questions/28185979/view-value-of-password-edittext-while-a-button-is-pressed