In my previous blog I have explain how to create animation button in android. Now in this below example I have created new animation button which is alpha effictive.

Here I have added Button and TextView in activity_main xml layout then I have created new directory (anim) , In anim directory I have created new anim_alpha.xml layout. In MainActivity I have used AnimationUtils.loadAnimation function and setOnClickListener method. You can see below program it will clearly describe you how to create alpha effective Animation button in android.

Step(1)activity_main.xml layout-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Animation Click"
        android:textAlignment="center"
        android:layout_marginTop="20dp"
        android:textSize="20dp"
        android:textColor="@color/colorPrimaryDark"/>


    <Button
        android:id="@+id/click"
        android:layout_gravity="center"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="Clich here" />


</LinearLayout>

Step(2)MainActivity-

public class MainActivity extends AppCompatActivity {

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);


            final Animation animAlpha = AnimationUtils.loadAnimation(this, R.anim.anim_alpha);

            Button btnAlpha = (Button)findViewById(R.id.click);

            btnAlpha.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    arg0.startAnimation(animAlpha);
                }});

        }
    }

Step(3)-Create new directory anim and created here new anim_alpha.xml layout-

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator">
    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.1"
        android:duration="500"
        android:repeatCount="1"
        android:repeatMode="reverse" />
</set>