Page Zoom Controls Android Example Java

1/  Create A New Project  and design the page

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/tutorialb" />

    <ZoomControls
        android:id="@+id/simpleZoomControl"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/img"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp" />

</RelativeLayout>

2/  Java Activity

package com.tutorialb.pagezoom;

import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.ZoomControls;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    
    private ZoomControls simpleZoomControls;
    ImageView img;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
        simpleZoomControls = findViewById(R.id.simpleZoomControl);
        img = findViewById(R.id.img);
        
        simpleZoomControls.setOnZoomInClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Add your zoom in functionality here
                float x= img.getScaleX();
                float y = img.getScaleY();

                img.setScaleX(x+1);
                img.setScaleY(x+1);
            }
        });

        simpleZoomControls.setOnZoomOutClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Add your zoom out functionality here
                float x= img.getScaleX();
                float y = img.getScaleY();

                img.setScaleX(x-1);
                img.setScaleY(x-1);
            }
        });
    }
}

3/ Ran And Output