Best way to make a "glowing" button in android java?

Question

I am using Android Java in Android Studio with this project. I am trying to make a pulsating shadow for my button. I want it so whenever the user clicks the wrong button, I bring attention to the button they should click by making pulsating a shadow. I have looked through many forums and posts with no success. If there is a different way to do this, please let me know. Thanks!

EDIT: Here's some code I was working on:

newTimerTask = new TimerTask() {
        @Override
        public void run() {
            ObjectAnimator colorFade = ObjectAnimator.ofObject(start_stop_btn, "background", new ArgbEvaluator(), R.drawable.button_shadow, 0xff000000);
            colorFade.setDuration(7000);
            colorFade.start();
            start_stop_btn.setBackground(ContextCompat.getDrawable(getApplicationContext(), R.drawable.button_shadow);
        }
    };
    Timer newTimer = new Timer();
    newTimer.schedule(newTimerTask, 0, 100);

button_shadow.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
    <layer-list>
        <item android:right="5dp" android:top="5dp">
            <shape>
                <corners android:radius="3dp" />
                <solid android:color="#D6D6D6" />
            </shape>
        </item>
        <item android:bottom="2dp" android:left="2dp">
            <shape>
                <gradient android:angle="270"
                    android:endColor="#E6E600" android:startColor="#FFFF00" />
                <stroke android:width="1dp" android:color="#BABABA" />
                <corners android:radius="4dp" />
                <padding android:bottom="10dp" android:left="10dp"
                    android:right="10dp" android:top="10dp" />
            </shape>
        </item>
    </layer-list>
</item>

Thanks in advance!

Answer 1

There is no such attribute in Android, to show a shadow. You can do a work around like this :

Take LinearLayout or Framelayout with grey color, under your Button, with margin at bottom and right equal to 1 or 2 dp.

Make it visible when wrong Button is clicked.

Thats the best I can suggest for your requirement.

My suggestion is to get a good animation to catch user attention though.