How to set button click effect in Android?

Create your AlphaAnimation Object that decides how much will be the fading effect of the button, then let it start in the onClickListener of your buttons

For example :

private AlphaAnimation buttonClick = new AlphaAnimation(1F, 0.8F);

// some code

public void onClick(View v) {
    v.startAnimation(buttonClick);
}

of course this is just a way, not the most preferred one, it's just easier

It is simpler when you have a lot of image buttons, and you don't want to write xml-s for every button.

Kotlin Version:

fun buttonEffect(button: View) {
    button.setOnTouchListener { v, event ->
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                v.background.setColorFilter(-0x1f0b8adf, PorterDuff.Mode.SRC_ATOP)
                v.invalidate()
            }
            MotionEvent.ACTION_UP -> {
                v.background.clearColorFilter()
                v.invalidate()
            }
        }
        false
    }
}

Java Version:

public static void buttonEffect(View button){
    button.setOnTouchListener(new OnTouchListener() {

        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN: {
                    v.getBackground().setColorFilter(0xe0f47521,PorterDuff.Mode.SRC_ATOP);
                    v.invalidate();
                    break;
                }
                case MotionEvent.ACTION_UP: {
                    v.getBackground().clearColorFilter();
                    v.invalidate();
                    break;
                }
            }
            return false;
        }
    });
}

This can be achieved by creating a drawable xml file containing a list of states for the button. So for example if you create a new xml file called "button.xml" with the following code:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/YOURIMAGE" />
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/gradient" />
    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/gradient" />
    <item android:drawable="@drawable/YOURIMAGE" />
</selector>

To keep the background image with a darkened appearance on press, create a second xml file and call it gradient.xml with the following code:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <bitmap android:src="@drawable/YOURIMAGE"/>
    </item>
    <item>
        <shape xmlns:android="http://schemas.android.com/apk/res/android">
            <gradient android:angle="90" android:startColor="#880f0f10" android:centerColor="#880d0d0f" android:endColor="#885d5d5e"/>
        </shape>
    </item>
</layer-list>

In the xml of your button set the background to be the button xml e.g.

android:background="@drawable/button"

Hope this helps!

Edit: Changed the above code to show an image (YOURIMAGE) in the button as opposed to a block colour.