How can I make an animated/constant glowing effect around button in android?

Step 1: Create a "glowing" drawable to put behind your button and put them both in a Framelayout. You'll need to put some padding around your button to be able to see the drawable behind it.

Step 2: Create an animation resource file like this and adjust the numbers to your likings.

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fillAfter="true">

    <scale
        android:fromXScale="1"
        android:toXScale="0"
        android:fromYScale="1"
        android:toYScale="0"
        android:duration="400"
        android:pivotX="50%"
        android:pivotY="50%"
        />

    <scale
        android:startOffset="700"
        android:fromXScale="0"
        android:toXScale="1"
        android:fromYScale="0"
        android:toYScale="1"
        android:duration="400"
        android:pivotX="50%"
        android:pivotY="50%"
        />
</set>

What you can do is you can make a relative layout as a background like this-

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="#FFC107"
        android:alpha="0.1"
        android:layout_marginBottom="30dp">


        <Button
            android:layout_width="match_parent"
            android:layout_height="40dp"


            />

    </RelativeLayout>

i have set the alpha to 0.1 initially in relative layout.

now in activity you can write the animation of fadein and fadeout-

ObjectAnimator fadeOut = ObjectAnimator.ofFloat(relativelayout, "alpha", .5f, .1f);
        fadeOut.setDuration(300);
        ObjectAnimator fadeIn = ObjectAnimator.ofFloat(relativelayout, "alpha", .1f, .5f);
        fadeIn.setDuration(300);

        mAnimationSet = new AnimatorSet();

        mAnimationSet.play(fadeIn).after(fadeOut);

        mAnimationSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                mAnimationSet.start();
            }
        });

        mAnimationSet.start();

EDIT 3:

Update you layout like this copy and paste the code : change the color accordingly.

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="30dp">

        <RelativeLayout
            android:id="@+id/relative_layout_id"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:layout_centerInParent="true"
            android:background="#FFC107"
            android:alpha="0.1">


        </RelativeLayout>

        <Button
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:background="#000000"
            android:layout_centerInParent="true"

            />

    </RelativeLayout>