Create “Hello World” application that will display “Hello World” in the middle of the screen in emulator. Also display “Hello World” in the middle of the screen in the android phone.

/*Create “Hello World” application that will display “Hello World” in the middle of the screen in emulator. Also display “Hello World” in the middle of the screen in the android phone.*/

File Name: activity_main.xml

<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:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin" 

    tools:context=".MainActivity">

    <TextView android:text="Hello World" 

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/hello"

        android:layout_centerVertical="true"

        android:layout_centerHorizontal="true"

        android:textSize="50sp" />

</RelativeLayout>

File Name: MainActivity.java

package com.fuzzycode.helloworld;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.menu_main, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

    return super .onOptionsItemSelected(item);

    }

}

ouput: