How to Hide/Unhide Title Bar| How to Hide Status Bar| Pragmatically with Java| with App Theme

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hide or show title bar By programatically with java in particular activity

First Method with java

With this code you hide Title Bar

MainActivity.java

package com.usmtip.demoappbyusmtip;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE); //will hide the title
        getSupportActionBar().hide(); // hide the title bar
        
        setContentView(R.layout.activity_main);
    }
}

With this code you hide Status Bar or you can enable full screen

MainActivity.java

package com.usmtip.demoappbyusmtip;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN); //enable full screen
        
        setContentView(R.layout.activity_main);
    }
}

you can use both in single activity

With this code you hide Title Bar and Status Bar or you can enable full screen

MainActivity.java

package com.usmtip.demoappbyusmtip;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE); //will hide the title
        getSupportActionBar().hide(); // hide the title bar
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN); //enable full screen
        
        setContentView(R.layout.activity_main);
    }
}

Second Method with App Theme

Go to >>  Values

then >> themes or style

and themes.xml

and use this code

Themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.DemoAppByusmtip" parent="Theme.MaterialComponents.DayNight.NoActionBar">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
    </style>
</resources>

Third Method in AndroidManifest.xml

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/usmtip"
        android:label="@string/app_name"
        android:roundIcon="@drawable/usmtip"
        android:supportsRtl="true"
        android:theme="@style/Theme.MaterialComponents.DayNight.NoActionBar">
        <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>