How to disable Home and other system buttons in Android?

This example demonstrates how to do I in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?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:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="16dp"
   tools:context=".MainActivity">
   <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Disable Home and Other System buttons"
      android:textAlignment="center"
      android:textSize="24sp"
      android:textStyle="bold" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
   }
   @Override
   public void onWindowFocusChanged(boolean hasFocus) {
      super.onWindowFocusChanged(hasFocus);
      hideNavigationBar();
   }
   private void hideNavigationBar() {
      final View decorView = this.getWindow().getDecorView();
      final int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
         | View.SYSTEM_UI_FLAG_FULLSCREEN
         | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
         | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
         | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
      Timer timer = new Timer();
      TimerTask task = new TimerTask() {
         @Override
         public void run() {
            MainActivity.this.runOnUiThread(new Runnable() {
               @Override
               public void run() {
                  decorView.setSystemUiVisibility(uiOptions);
               }
            });
         }
      };
      timer.scheduleAtFixedRate(task, 1, 2);
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <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=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code.