How to auto fit (auto scale or Zoom) an image in webView of your Android App? – Android Studio code

This video shows the steps to auto fit/ auto scale an image file in the WebView widget of your Android App.

It uses below attributes in the settings of the WebView object to enable the auto-scaling:
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);

For testing purpose, it uses below image from the testing page of programmer world website: https://programmerworld.co/selenium-test-page/

https://i0.wp.com/programmerworld.co/wp-content/uploads/2023/05/flower.png?w=977&ssl=1

I hope you like this video. For any questions, suggestions or appreciation please contact us at: https://programmerworld.co/contact/ or email at: programmerworld1990@gmail.com

Complete source code and other details:

package com.programmerworld.autofitimageinwebview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    private EditText editText;
    private WebView webView;

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

        editText = findViewById(R.id.editText);
        webView = findViewById(R.id.webView);
    }

    public void buttonWithAutoFit(View view){
        webView.loadUrl(editText.getText().toString());

        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setUseWideViewPort(true);
    }


    public void buttonWithoutAutoFit(View view){
        webView.loadUrl(editText.getText().toString());

        webView.getSettings().setLoadWithOverviewMode(false);
        webView.getSettings().setUseWideViewPort(false);
    }
}

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

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AutoFitImageInWebView"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="355dp"
        android:layout_height="61dp"
        android:layout_marginStart="28dp"
        android:layout_marginTop="59dp"
        android:ems="10"
        android:hint="URL ..."
        android:inputType="text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="134dp"
        android:layout_height="64dp"
        android:layout_marginStart="28dp"
        android:layout_marginTop="20dp"
        android:onClick="buttonWithAutoFit"
        android:text="Show Auto Fit"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <Button
        android:id="@+id/button2"
        android:layout_width="146dp"
        android:layout_height="64dp"
        android:layout_marginStart="60dp"
        android:layout_marginTop="20dp"
        android:onClick="buttonWithoutAutoFit"
        android:text="Show without autofit"
        app:layout_constraintStart_toEndOf="@+id/button"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <WebView
        android:id="@+id/webView"
        android:layout_width="409dp"
        android:layout_height="507dp"
        android:layout_marginStart="1dp"
        android:layout_marginTop="1dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2" />
</androidx.constraintlayout.widget.ConstraintLayout>

Screenshots:

URL of the image used in this demo:

https://i0.wp.com/programmerworld.co/wp-content/uploads/2023/05/flower.png?w=977&ssl=1