How to use alpha animation in android

In this android programming source code example, we are going to use alpha animation in android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to use alpha animation in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".animation.Animation8">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Alpha Animation"
        android:textSize="20sp"
        android:layout_gravity="center_horizontal"/>

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/notebook"/>

</LinearLayout>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;


public class Animation8 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_animation8);

        final ImageView imageView = findViewById(R.id.image);
        final Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha);
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                imageView.startAnimation(animation);
            }
        });
    }
}

anim/alpha.xml

<?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="0.2"
        android:toAlpha="1.0"
        android:duration="500"/>
</set>

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