We know "Hello World" in C . Let's start with "Hello Android" in Android

We know that "Hello World" is the first program written in C language . Generally we started our programming skills with this program. So, here I write "Hello Android" programming in Android .One of the simplest program in Android.

So, how to start Android programming in Eclipse ? Don't worry . It's very simple. Follow the instructions :

1) Go to File -> New -> Project -> Android -> Android Application Project -> Next

After that give the project name, package name in this manner :

then press the "Next" button, and follow the steps one by one.

2) Go to "res"->"layout"->"main.xml"(xml name depend upon user choice) and write this :

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"

     >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/tv1"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:textSize="30sp"

        android:textColor="#078FCE"

        android:text="@string/hello_android" />

</RelativeLayout>

3)  Go to "res"->"values"->"string.xml" and edit this :

string.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">Hello Android</string>

    <string name="action_settings">Settings</string>

    <string name="hello_android">Hello Android!</string>

</resources>

4) Go to "src"->"package name(here com.blogspot.satyaki.mukherjee.helloandroid)"->"MainActivity.java"(the java file name is also depend upon user choice) and write this java code: 

MainActivity.java


package com.blogspot.satyaki.mukherjee.helloandroid;

import android.os.Bundle;
import android.app.Activity;

public class MainActivity extends Activity {

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

}


The result is :

or ,
You can edit the "TextView" also from java code:


package com.blogspot.satyaki.mukherjee.helloandroid;

import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {

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

textView=(TextView) findViewById(R.id.tv1);

textView.setText("Hello Android ? Hello Satyaki...");
textView.setTextSize(15);
textView.setTextColor(Color.RED);
}

}

The output is:

If you have any query regarding this , then you can freely contact with me.

Thanks.