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Create an empty activity in android studio

Activity

Create an empty activity

1. Right click on your package and click on ‘New’ → ‘Activity’ → ‘Empty Activity’.


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2. A popup window will appear to enter the activity name. Enter the activity name and click on ‘Finish’ button.


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Explaining files created in empty activity

1. Activity_main2.xml – This is the file where you can create UI elements. For now this file only contains root tag and namespaces.

<?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=".Main2Activity">
</androidx.constraintlayout.widget.ConstraintLayout>




2. Main2activity.java – In this file you can write the validations, business logic and database layer.

package com.example.insuranceapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class Main2Activity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
  }
}

1. The class is inherited from AppCompatActivity class. This is the base class of all activities.
2. onCreate method is overridden.
3. setContentView specifies the associated XML file.