Create First Android Apps in Android Studio 

 We need to some Software And Programming Knowledge to Create an  android Application

here below list

Prerequisites

Programming Knowledge : 

1.  Java or Kotlin 
2. XML 

Software :

1. JAVA ( recomended JAVA 11)

2. IDE - Android Studio ( latest )  

3. Windows Operating System 

4. Emulator for testing  virtual apps 

        or 

5. Physical Android Mobile ( for testing in Mobile ) 

following steps to create first Android Apps 

Step 1 

Open Android Studio  in Windows

In Android Studio click on "File" , next click "New" , Next Click "New Project 

in sort -   in Android Studio   >> File >> New >> New Project 

Step 2 : 

Choose Option - "Phone and Tablet" and next select "Empty View Activity"  after click below Next Button 

below ScreenShot Image 

Android Studio - Select Activity

after Click Next 

Step 3 

write project Name  -   example - "FirstAndroidApp"

select location  folder - where you want to save project

next choose language - Java Or Kotlin 

next select Version  minimum SDK in "Lollipoop 5.0"

after click on Finish Button - 

as see in screenshot image 

Step 4

now clicking finish button wait some times ( until  finishing , first time take More time)

 finishing after see three Source code Files  Folders 

1. MainActivity.java

2. Activity_man.xml

3. manifest.xml

below screenshot image 

Step 4 - 

now Write Source Code -

1.  MainActivity.java 

Go to app >>  java >>  MainActivity.xml

Source Code :

 package com.example.firstandroidapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

2. activity_main.xml 

Go to app > layouts > activity_main.xml

Source Code :

<?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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"			
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

3. manifest.xml  No Need to Change 

Source Code :

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

    <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.FirstAndroidApp"
        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>	

Step 5:

            After Solve All Error And Warning to Need Build Application 

            Click on "Build" after Select " Make Project" or Sortcut - "CTR + F9"

Wait few time after Succesfully build 

then need to 

click on "Run"  and after select 'Run App'

here select Virtual Emulator or connect to Physical Mobile to install new Application 

after install please test Applcation