AppDatePicker

//=====================================================
    class AppDatePicker extends DatePicker{

        private Runnable r;
        private OnDateChangedListener list;

        //===================================
        public AppDatePicker(Context context) {
            super(context);
            r = new Runnable(){public void run(){
                list.onDateChanged(AppDatePicker.this, getYear(), getMonth(), getDayOfMonth());
                check();
            }};
        }

        //===================================
        @Override
        public void init(int year, int month, int date, OnDateChangedListener list){
            super.init(year, month, date, list);
            this.list = list;
        }

        //===================================
        private void check(){
            postDelayed(r, 200);
        }

        //===================================
        @Override
        public void onAttachedToWindow(){
            if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.LOLLIPOP)
                check();
            super.onAttachedToWindow();
        }

        //===================================
        @Override
        public void onDetachedFromWindow(){
            if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.LOLLIPOP)
                removeCallbacks(r);
            super.onDetachedFromWindow();
        }
    }