Before we move forward to learn https://kickwe.com/tutorial/android-development-tutorial/ refers Android development tutorial from scratch; we must have to understand Android application architecture. Which atually recognized by the android system and IDE’s. An Android application consists with many image-video-gif or any media items, Graphical User Interface(GUI) design, System information, Web information and interactions. Let’s see a basic Android application structure. This tutorial prepared in assistance for beginner’s level. That doesn’t show you actual programming process but understanding the basic project structure. Thus, it’s very effective in the process of https://kickwe.com/tutorial/android-development-tutorial/ refers Android development tutorial Few things we need to keep in mind before we dive into this android development tutorial : Android application graphics is initially handled by XML but you can also perform graphical stunt using Java. Build.gradle is the core project class identification file where we have to familiarize the application which are going to use. Yes I Mean libraries and library resources.

1. Android basic application file
structure
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Android development tutorial- android
basic project file structure should be your
first step to learn Android application
development.
Difficulty Level: Easy
Duration: 30 minutes or less
Application: Nothing , just patience and
understanding.
Before we move forward to learn
Android development tutorial

2. from scratch; we must have to understand Android application
architecture. Which atually recognized by the android system
and IDE’s.
An Android application consists with many image-video-gif or
any media items, Graphical User Interface(GUI) design, System
information, Web information and interactions.
Let’s see a basic Android application structure. This tutorial
prepared in assistance for beginner’s level. That doesn’t show
you actual programming process but understanding the basic
project structure. Thus, it’s very effective in the process of
Android development tutorial.
Few things we need to keep in mind before we dive into this
android development tutorial :
1. Android application graphics is initially handled by XML but
you can also perform graphical stunt using Java.
2. Build.gradle is the core project class identification file where
we have to familiarize the application which are going to use.
Yes I Mean libraries and library resources.
(https://kickwe.com/tutorial/wp-
content/uploads/2017/02/android_beginners_tutorial.jpg)
Android basic project structure by kickwe
The infograph above shows you basic structure of android
source code. Let us go in deep.
Let’s assume you have created a new android project in
android studio named as kickwe. Navigate to kickwe folder. You
will see some files and folders. I’m mentioning only important
among them :

3. 1. app (folder)
2. build.gradle (root project gradle file)
Here, app contains all the necessary files which we are going to
make. Some are automatically generated by android studio as
well.
Root build.gradle , this folder is very important. Here
you need to declare source of libraries which you are
going to mention in module build.gradle.
Example :
buildscript {
repositories {
jcenter()
}
Inside the app folder we will see below one folder named main.
Going through that main folder, there are few more files and
folders which play vital role regarding the android development
tutorial e.g:
build
It has all generated files made by the IDE. You don’t need to
worry about it, those are automatically created. However for
some troubleshooting you might need to delete this libs folder
to reset & make further generated files.
libs
Above folder is initially empty. If you want to use any .jar library,
you can place them here. Any library will be automatically
added if you places .jar files e.g:volley.jar here (you will need to
declare that in module build.gradle).
build.gradle (module gradle file)
This is the build.gradle file where we are going to mention
about application supported os API, application version, all
libraries name we are going to use and apply any plugin if
necessary.
Example:

4. src contains only one important folder addressed as main.
Inside, it has most important folder that contains two folders
and one file .
manifest.xml
This file provides essential information about your application to
the android operating system. This can be about required
permissions or activity lists and themes.
res
res
layout
activity_main.xml
activity_second.xml
values
colors.xml
dimens.xml
strings.xml
styles.xml
drawable
menu
In res section there are several folders, let’s just notice what it
does but remember these are just for good practice and not
necessary to always maintain this.
Layout
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android { compileSdkVersion 23 buildToolsVersion "23.0.1"
defaultConfig {
applicationId "com.example.amigoo.myapplication"
minSdkVersion 19
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
dependencies {
compile 'com.android.support:cardview-v7:+'
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'com.android.support:design:23.1.1'}
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//package name of the application
package=”com.example.kickwe.myapplication”
//declares this application requires internet connection
<uses-permission android:name=”android.permission.INTERNET”/>
//declares that you have an activity with specific activity name,theme
<activity
android:name=”.MainActivity”
android:label=”@string/app_name”
android:theme=”@style/AppTheme.NoActionBar”>
</activity>

5. Layout
It contains several XML files which is called through Java files.
Placing all your layout XML files here are good practice. So lets
follow those on our android development tutorial process.
Example :
activity_main.xml
activity_second.xml
Please note: xml file name can’t start with numeric number and
capital letter. Also there are limitations to use symbols as well.
values
It may contains 4 files.
1. colors.xml
2. dimens.xml
3. strings.xml
4. styles.xml
colors.xml usually contains all the colors used often in your
application. Specially the Google material design guideline
recommends you to define primary color, accent color and
primary dark. Indeed these are just proper way of android
application development, not obvious.
Example:
dimens.xml usually contains frequently used dimensions in the
application.
Example:
strings.xml lists all the static strings you are going to use in the
application. You can also write directly string in other layout xml
or Java files but these is also part of good practise.
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<?xml version=”1.0″ encoding=”utf-8″?>
<resources>
<color name=”colorPrimary”>#3F51B5</color>
<color name=”colorPrimaryDark”>#303F9F</color>
<color name=”colorAccent”>#FF4081</color>
</resources>
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<resources>
<!– Default screen margins, per the Android Design guidelines. –>
<dimen name=”activity_horizontal_margin”>16dp</dimen>
<dimen name=”activity_vertical_margin”>16dp</dimen>
<dimen name=”fab_margin”>16dp</dimen>
</resources>

6. Example:
styles.xml defines overal theme preferences and connects with
colors.xml.
Example:
drawable
Mostly images used by the application which is user defined. It
can contain some xml that defines vector or svg images.
Remember , the application icon (ic_launcher.png) also
belongs here.
Menu (optional)
along with other it’s menu.xml that provides menu item names.
Example:
java
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<resources>
<string name=”app_name”>kickwe Android development tutorial </string>
<string name=”action_settings”>Settings</string>
</resources>
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<resources>
<!– Base application theme. –>
<style name=”AppTheme” parent=”Theme.AppCompat.Light.DarkActionBar”>
<!– Customize your theme here. –>
<item name=”colorPrimary”>@color/colorPrimary</item>
<item name=”colorPrimaryDark”>@color/colorPrimaryDark</item>
<item name=”colorAccent”>@color/colorAccent</item>
</style>
<style name=”ButtonGray”>
<item name=”colorButtonNormal”>@color/colorAccent</item>
</style>
<style name=”AppTheme.NoActionBar”>
<item name=”windowActionBar”>false</item>
<item name=”windowNoTitle”>true</item>
</style>
<style name=”AppTheme.AppBarOverlay” parent=”ThemeOverlay.AppCompat.Dark.ActionBar
<style name=”AppTheme.PopupOverlay” parent=”ThemeOverlay.AppCompat.Light” />
</resources>
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<menu xmlns:android=”http://schemas.android.com/apk/res/android” xmlns:app=”http://schemas.android.com/apk/res-auto” xmlns:to
<item
android:id=”@+id/action_settings”
android:orderInCategory=”100″
android:icon=”@drawable/cart24″
app:showAsAction=”always” />
</menu>

7. This is where you are going to program the application.
Ultimately you may have seen there are several folders inside
it, which is automatically generated according to your choice.
While you choose your package name at new project wizard of
Android studio.
Example : com.android.development.tutorial
PS: this can’t contain capital letter.
After that you will see only one class file made by Android
studio called activity_main.java
Alright now keep writing more on the blank project. How ? Next
we are going to start practice & experiment through various
example of Android development tutorial
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