Develop Your First Simple Android Application

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Well, one of my friend named OJANA MEGH told me to give some kind of basic Android Application Developing Guideline. So, I decided to write a post in simplest way for understanding for the guys who are new to Android Application Development. I'll offer full source code for you guys too. Here we go:-

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Tools you need for developing your first android Application:

1. ADT ( Download ADT from here )
2. JRE / JAVA Runtime Environment ( Download from here )

Updates you need to make: 

Open up Eclipse from ADT that you downloaded and extracted. From top menu Click on Menu > Window > Android SDK manager
1. Follow this image: SDK Updates 1
2. Follow this image: SDK Updates 2
Install those whose are installed here. Restart Eclipse.

Work Flow:
1. Go in Eclipse. Press Alt+Shift+N , a window will appear. Click on Android Application Project for new Android Application  Project.
2. Give a Application Name, as I named my app 'Simple App With Rubel'. For this project name your project exactly same as my one. Nothing Else needed. Click Next
3. Click Next Again. No need to do anything.
4. Here you will place icon for your application. Before starting create a icon and set that as your application icon. I placed the carnivalbd icon here. Click next.
5. Click Next here too, no need to do anything again.
6. Click on Finish! Your new project created successfully!



What to do next?
Well, I want a image of mine on my application and some description below. Then, My facebook and twitter link! Ok with you too? Well, after developing the app, it will look like below one:-

My Fitst App

Follow the below steps:

1. Right click on res folder from your project and create a new folder called 'drawable'. In drawable folder, keep your image naming 'kitten'. Keep a facebook icon naming 'fb' and a twitter icon name 'tw'. Not clear? Follow the below screenshot.

Drawable Files Setup

2. Now , place the below codes in your activity_main.xml file. Which is located in Project > res > layout folder.

Location of activity_main.xml file

<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.example.simpleappwithrubel.MainActivity"
    android:background="#2b3c50" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="18dp"
        android:gravity="center"
        android:orientation="vertical" >

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="200dp"
            android:layout_height="200dp"           
            android:src="@drawable/kitten" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="My Name is Ojana Megh. And I&apos;m developing my first application with Rubel. Visit the site of Rubel here in http://imRubel.blogspot.com"
            android:textColor="#f9f9f9"
            android:textSize="18dp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/linearLayout1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp" >
       
        <ImageButton
            android:id="@+id/imageButton1"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_marginRight="20dp"
            android:onClick="fbc"
            android:src="@drawable/fb" />
            
        <ImageButton
            android:id="@+id/imageButton2"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:onClick="twc"
            android:src="@drawable/tw" />
       
       
    </LinearLayout>

</RelativeLayout>

3. Place the below codes in your Project > src > com.example.simpleappwithrubel >  MainActivity.java file:

package com.example.simpleappwithrubel;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;

public class MainActivity extends Activity  {

    public ImageButton fb,tw;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
       
        fb = (ImageButton) findViewById (R.id.imageButton1);
        tw = (ImageButton) findViewById (R.id.imageButton2);
       
    }

   
   
    public void fbc(View v) {
           
            Uri uri = Uri.parse("https://facebook.com/rubel007cse");
             Intent intent = new Intent(Intent.ACTION_VIEW, uri);
             startActivity(intent);

    }
   
    public void twc(View v) {
           
            Uri uri = Uri.parse("https://twitter.com/rubel007cse");
             Intent intent = new Intent(Intent.ACTION_VIEW, uri);
             startActivity(intent);

    }
   
   
}

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4. Click on Window from Menu. Then click on Android Virtual device. Click on Device Definition tab. Then, click on Create AVD from the right side. Then, Select and place options as shown in below. Then, click OK OK and come out. ( follow below images )

Select this from device definition

Select yours like this and click ok

5. Right click on your project. Find 'Run As' > 'Android Application'. Then your project will be built up with apk file. Find the apk folder on workspace > your project > bin folder. You can take this apk file to your Android Phone and run this application.


We are done! Happy developing! Happy coding!
Comment if you face any problem!
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