Android Project folder Structure

Android Studio is the official IDE (Integrated Development Environment) developed by JetBrains community which is freely provided by Google for android app development.

After completing the setup of Android Architecture we can create android application in the studio. We need to create new project for each sample application and we should understand about the folder structure. It look like this:



The android project contains different type of app modules, source code files and resource files. We will explore all the folders and files in android app.

  1. Manifests Folder
  2. Java Folder
  3. res (Resources) Folder
    • Drawable Folder
    • Layout Folder
    • Mipmap Folder
    • Values Folder
  4. Gradle Scripts

Manifests Folder

Manifests folder contains AndroidManifest.xml for our creating the android application. This file contains information about our application such as android version, metadata, states package for Kotlin file and other application components. It acts as an intermediator between android OS and our application.

Following is the mainfests folder structure in android application.

AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http:// schemas.android.com/apk/res/android"
    package="com.geeksforgeeks.myapplication">
  
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
  
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
  
</manifest>

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Java folder

Java folder contains all the java and Kotlin source code (.java) files which we create during the app development, including other Test files. If we create any new project using Kotlin, by default the class file MainActivity.kt file will create automatically under the package name “com.geeksforgeeks.myfirstkotlinapp” like as shown below.

MainActivity.kt

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package com.geeksforgeeks.myapplication
  
    import androidx.appcompat.app.AppCompatActivity import android.os.Bundle
  
    class MainActivity : AppCompatActivity() {
  
    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
    }
}

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Resource (res) folder

Resource folder is the most important folder because it contains all the non-code sources like images, XML layouts, UI strings for our android application.

res/drawable folder

It contains the different type of images used for the development of the application. We need to add all the images in drawable folder for the application development.

res/layout folder

Layout folder contains all XML layout files which we used to define the user Interface of our application. It contains the activity_main.xml file.

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http:// schemas.android.com/apk/res/android"
    xmlns:app="http:// schemas.android.com/apk/res-auto"
    xmlns:tools="http:// schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
  
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
  
</androidx.constraintlayout.widget.ConstraintLayout>

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res/midmap folder

This folder contains launcher.xml files to define icons which are used to show on the home screen. It contains different density type of icons depends upon the size of the device such as hdpi, mdpi, xhdpi.

res/values folder

Values folder contains a number of XML files like strings, dimens, colors and styles definitions. One of the most important file is strings.xml file which contains the resources.

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<resources>
    <string name="app_name">NameOfTheApplication</string>
    <string name="checked">Checked</string>
    <string name="unchecked">Unchecked</string>
</resources>

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Gradle Scripts folder

Gradle means automated build system and it contains number of files which are used to define a build configuration which can be apply to all modules in our application. In build.gradle (Project) there are buildscripts and in build.gradle (Module) plugins and implementations are used to build configurations that can be applied to all our application modules.



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