Create your First Android Application 'Hello World'

1. Create New Android Application.

           Select File --> New--> New Project

2. Configure your project.

      Here you can configure your project name, project location, then click Next button

3.  Set Minimum SDK    

4. Select Activity

5 Modify Layout File

Your layout file should be like this:

<?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: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.donix.helloworldapp.MainActivity">

    <TextView  android:layout_width="wrap_content" 

               android:layout_height="wrap_content"

               android:text="Hello World!" />
</RelativeLayout>

6. Modify Activity Java File.

Your java file should be like this:

public class MainActivity extends AppCompatActivity {

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

// Mention your layout file where textview is defined 
        setContentView(R.layout.activity_main);

        Toast.makeText(this,"Hello World",Toast.LENGTH_LONG).show();

    }


}



7. Running Your Application.

To Run your Application,First start AVD/Emulator or Connect your phone to pc, then Click on Run 

button