Directory Structure of Android Application

When you create new android project from eclipse editor you found that there are lots of directories created for android application lets us understand all these directory.

Let us start from the top directory the top most directory is src directory.

SRC Directory

The src Directory contains the java files inside package.

gen Directory

The gen directory contains folder that are generated for us by the toolset. one of the best thing you will find in gen directory is R.java file. R.java file update automatically by the system whenever you add or remove the design object or anything. in straight forward way whatever you add or remove from your project will be update in R.java file.

Android 1.5 or X.X

This folder is associate with the  SDK version  this is the thing that we have to configure when we create new project of android application.

assets

the assets folder provides repository for your resource which are using by your android application. for eg if your android application has sound effect then you can put those sound files in this folder but you cant put image files in this folder because we have another folder for images like stuff.

bin

Every program gets compiled and generate binary files same way android program also gets compiled and generate binary files. android bin folder contains the compiled binary files.

res

the res folder doesnt contain any files but it is one of the most important directory in android application. let us see what kind of directory res folder has.

res/drawable

Drawable folder contains images. there are three kind of screen density. you can specify same three images for different screen density. for eg res/drawable-hdpi contains all your image resources for high-resolution devices.   you dont need to specify which density images to pick when but operating system will choose it at run time.

res/layout 

the layout folder is where you put your main.xml file. all design resources are stored in this folder.

res/values

values folder contains string resource. mostly its in key value pair. some common file is strings.xml

AndroidManifest.xml: 

The manifest file is responsible for providing essential information to the operating system about a   particular application. for e.g. used to specify the default activity to launch.

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Execution Flow of Android Application

As a Beginner You need to know the execution flow of your android application. to understand the basic execution flow of android  we are  considering the hello world example.

When you create the android project in eclipse lots of folder are created such as "src" ,"gen" , "Android 1.5"  , "assets" and "res" folder.

To understand android flow we are starting with the "res" folder. In "res" folder there is a file called "AndroidManifest.xml".

These below is the content of AndroidManifest.xml file

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

<manifest

      package="com.example"

      android_versionCode="1"

      android_versionName="1.0">

    <uses-sdk android_minSdkVersion="3" />

    <application android_icon="@drawable/icon" android_label="@string/app_name">

        <activity android_name=".HelloWorldDemo"

                  android_label="@string/app_name">

            <intent-filter>

                <action android_name="android.intent.action.MAIN" />

                <category android_name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

      

    </application>

</manifest>

In the Above Xml code we have an activity called "HelloWordDemo" listed in activity tag this activity will be launched first. if you have multiple activity in your android application you must have to register all your activity in AndroidManifest.xml file.

you can specify your child activity by just <activity android_name=".xyz"></activity> adding as many tag as many activity you have in your android application. Make sure you specify "." (dot) before each activity.

Activity name ".HelloWorldDemo" will call HelloWorldDemo.java file.

package com.example;

import android.app.Activity;

import android.os.Bundle;

public class HelloWorldDemo extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

}

When HelloWorldDemo Activity is created by default onCreate method will be executed. inside onCreate Method we have an setContentView which execute the android application design file whose name is main.xml  because we have R.layout.main as an argument.

In Brief  AndroidManifest.xml file execute the Launcher Activity class and from the launcher activity onCreate method will execute the Design View file by using setContentView method.

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[Application name] Google Chrome Beta v31.0.1650.29
[Updated] 2013-10-20
[Supported Platforms] Android
[Charges that] completely free to use
[Safety Instructions] No virus / no plug-ins / No dark button
[Category] Network Tools

Application Profile
Version: 31.0.1650.29
Software Size: 28.68MB
Language: Simplified Chinese
Developer: Google
System Requirements: 4.0 and above

Application description: 
This is a beta version of Chrome browser

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Latest Google Play Store 4 4 22 APK Application free download

The APK is signed by Google and upgrades your existing Play Store.
The cryptographic signature guarantees that the file is safe to install and was
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it just like any other APK and enjoy the new Play Store experience.

Whats New?
As you can imagine, a 0.0.1 bump indicates that not much at all has changed.
There are definitely updated translations inside. Ive also found some code changes
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The delay seems to be set at 300,000 milliseconds, which equals 5 minutes.
Thats about it - everything else looks minor.

com.android.vending-4.4.22.apk 5.84 MB (6,126,834 bytes)

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