How to display app in Full Screen by removing the title bar and navigation bar...

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Please Note: The images are taken from Pixabay.

----------------------------------In the full_screen_activity.xml file-----------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/animalbg"
    android:orientation="vertical" >
</LinearLayout>

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--------------------------------------------In FullScreenActivity.java------------------------------------------------

package com.app.yourappname;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class FullScreenActivity extends Activity {

    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.full_screen_activity);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }
}

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

</manifest>

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