Full source code to create Animated Gradient Background like Instagram
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gradient_list"
tools:context="com.example.application.animatedgradientapp.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
gradient_1.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:angle="225"
android:endColor="#044fab"
android:startColor="#ffd6d3" />
</shape>
gradient_2.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:angle="45"
android:endColor="#933c94"
android:startColor="#517f95" />
</shape>
gradient_list.xml
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/gradient_1"
android:duration="4000"/>
<item android:drawable="@drawable/gradient_2"
android:duration="4000"/>
<item android:drawable="@drawable/gradient_3"
android:duration="4000"/>
</animation-list>
MainActivity.java
package com.example.application.animatedgradientapp;
import android.graphics.drawable.AnimationDrawable;
import android.support.constraint.ConstraintLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ConstraintLayout constraintLayout = findViewById(R.id.layout);
AnimationDrawable animationDrawable = (AnimationDrawable) constraintLayout.getBackground();
animationDrawable.setEnterFadeDuration(2000);
animationDrawable.setExitFadeDuration(4000);
animationDrawable.start();
}
}