Automatic Scrolling in Android Animation (Updated with androidx package)

This tutorial is all about scrolling series of images automatically which are arranged vertically as well as horizontally.
Please see the video: 

Make sure your images are kept in the drawable folder.

---------------------------------------- scroll_animation_activity.xml ----------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/colorPrimaryDark">
    <HorizontalScrollView
        android:id="@+id/saa_horizontalSV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <LinearLayout
            android:id="@+id/saa_hscroll_childLL"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:background="@color/colorPrimary">
            <ImageView
                android:src="@drawable/i7"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"/>
        </LinearLayout>
    </HorizontalScrollView>

    <ScrollView
        android:id="@+id/saa_simpleSV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center">
        <LinearLayout
            android:id="@+id/saa_sscroll_childLL"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:background="@color/colorPrimary">
            <ImageView
                android:src="@drawable/i7"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"/>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

----------------------------------------------------------------------------------------------------

------------------------------------- ScrollAnimationActivity.java -------------------------------------

package com.app.yourappname;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ScrollView;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

public class ScrollAnimationActivity extends AppCompatActivity {

    private HorizontalScrollView hsv;
    private ScrollView sv;
    private int num=0;

    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        setContentView(R.layout.scroll_animation_activity);
        LinearLayout hscrollChildLL = findViewById(R.id.saa_hscroll_childLL);
        LinearLayout sscrollChildLL = findViewById(R.id.saa_sscroll_childLL);
        ImageView iv;

        int imgs[] = {R.drawable.i0, R.drawable.i1, R.drawable.i2, R.drawable.i3, R.drawable.i4,
                R.drawable.i5, R.drawable.i6, R.drawable.i7, R.drawable.i8, R.drawable.i9, };

        for(int i=0; i<10; i++) {
            iv = new ImageView(this);
            iv.setImageResource(imgs[i]);
            hscrollChildLL.addView(iv);
            iv = new ImageView(this);
            iv.setImageResource(imgs[imgs.length-(i+1)]);
            sscrollChildLL.addView(iv);
        }

        hsv = findViewById(R.id.saa_horizontalSV);
        sv = findViewById(R.id.saa_simpleSV);
        autoScroll();
    }

    void autoScroll() {
        new Thread(){
            @Override
            public void run() {
                while(true) {
                    try{
                        Thread.sleep(25);
                    }catch(InterruptedException e) {}
                    handler.sendMessage(handler.obtainMessage());
                    num++;
                }
            }
        }.start();
    }

    Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            hsv.scrollTo(num,0);
            sv.scrollTo(0,num);
        }
    };
}

------------------------------------------------------------------------

------------------------------- Declare the Activity Name in Manifest File -----------

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.app.yourappname">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".ScrollAnimationActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>