Android studio can not detect the source file in res/drawable

Issue

This is my code. I don't know how to post this image.

I tried to add source file for my ImageView. But it doesn't work. I tried to copy the path folder and it is still not work.

Solution

Solution - first problem

The resource name must start with a letter (not number).

Solution - second problem

Use just:

@drawable/039_cloud

instead

@drawable/039_cloud/039_cloud

so:

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/039_cloud" />

Android Studio

Android Studio is grouping same images, but for different DPIs.

When you choose Android view, you will have:

But when you will choose Project you will see "real" project structure:

Answered By - Boken