监听短信

        ContentResolver resolver = getContentResolver();
        Uri uri = Uri.parse("contnent://sms/");
        resolver.registerContentObserver(uri, true, new MyObserver(new Handler()));

    class MyObserver extends ContentObserver {
        public MyObserver(Handler handler) {
            super(handler);
        }
        @Override
        public void onChange(boolean selfChange) {
            super.onChange(selfChange);
            Toast.makeText(getApplicationContext(), "信息", Toast.LENGTH_SHORT).show();
        }
    }