Android Studio - No resource found that matches the given name

Issue

I am developing an app in Android Studio, I used the Android Asset Studio to make the launcher icon, and then I tried to Copy/Paste the new icon to overwrite the default one (like I always did in Eclipse) and nothing happens, so what I did was changing the name of the default ic_launcher to a.png and then from the windows eplorer copy/paste each ic_launcher.png in the corresponding mipmap folder, and delete de a.png's files (while Android Studio was running) and then that error was shown.

I tried clean, rebuild, build , refresh, resync the project and nothing happens, I am getting the same error. I also try to rename the build folder to build.old as this thread says, but still the error.

Error:(16, 23) No resource found that matches the given name (at 'icon' with value '@mipmap/a.png').
Error:Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\MyUser\AppData\Local\Android\Sdk\build-tools\21.1.2\aapt.exe'' finished with non-zero exit value 1

Manifest.xml

 ...<application
        android:allowBackup="true"
        android:icon="@mipmap/a.png"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity ...

Also I tried to change the value of android:icon="@mipmap/a.png" to android:icon="@mipmap/ic_launcher.png" but every time I rebuild it changes again to a.png.

Would I have to start from 0 and make a new project and copy all the things I have done or there is a way to fix this?

Solution

So, anything worked and I had to remake the app and copy/paste all clases and activities:

Lesson: Do not mess up with the project files from the explorer, go for the automatic, frameworked solutions that Android Studio gives to you.

Answered By - Alejandro Cumpa