How To Place A button Inside a Android Studio Project

My XML File is following
named as activity_asad_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:id="@+id/activity_asad__class"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.asad.se.Asad_Class">
    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Hello World!"

        android:id="@+id/btn"
        />
</RelativeLayout>

My Java File is following

named as Asad_Class

package com.example.asad.se;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;

public class Asad_Class extends AppCompatActivity {
    Button btn1;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_asad__class);
        btn1=(Button) findViewById(R.id.btn);
        
    }
}


My Manifest File Is Following





<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.asad.se">
    <application   
     android:allowBackup="true"  
      android:icon="@mipmap/ic_launcher" 
       android:label="@string/app_name"
        android:supportsRtl="true"   
        android:theme="@style/AppTheme">
        <activity android:name=".Asad_Class">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

This is the simple android application for the declaration of a button.

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