res

In Android Studio, the res directory is an important directory that contains various resources used by  Android applications.

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These resources include layouts, drawing assets, values, and more.
Here is a summary of the res directory and its subdirectories:

res/drawable:

This directory is for various drawable resources such as images, icons, and other graphics used in your app and all drawable file names must be small characters.

Example file name: ic_launcher.png

res/layout:

This directory contains XML layout files that define the structure and appearance of your app's user interface.
Each XML file corresponds to a specific screen or component within your app.

Example file: activity_main.xml

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

   <!-- Design Here--> 

</RelativeLayout>

res/values:

This directory contains XML files for different types of values used in your app, such as strings, colors, dimensions, styles, and more.
Example file: strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">NewTestProject</string>
    <string name="hello_world">Hello, World!</string>

</resources>

Example file: colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
</resources>

res/mipmap:

    This directory contains launcher icons for different screen densities

res/menu:

    This directory contains XML files for menu items for your app.

Example file: main_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_settings"
        android:title="Settings"
        app:showAsAction="never" />
</menu>