Source errors in eclipse

Question

When I create a new android project appearing red exclamation mark and when I tried to run the app the message say

Android library projects cannot be launched

From properties --- Android and unchecked the is library check box and unchecked but this solution not useful and the exclamation mark change to red X and this error

Project 'appcompat_v7' is missing required source folder: 'gen' resource appcompat_v7 location Build path

this problem only in the source file

Answer 1

I was having the EXACT same issue as listed above, but my solution was slightly different than the one outlined by Ramakishna with the screenshots...

I actually right-clicked on the "appcompat_v7" package in the package explorer and went to Build Path > Configure Build Path. I clicked on "Android" in the left hand column and I noticed that the "Project Build Target" was set to a lower API than the project I was currently trying to create. So, I just unchecked the Target Platform and set it to the highest possible API level/platform that I had installed.

Answer 2

Right-click on the appcompat_v7 project folder, then select Build project.

Eclipse will then create the gen subfolder and the "Project 'appcompat_v7' is missing required source folder: 'gen'" problem disappears, as well as the red exclamation mark.

Answer 3

Please follow the screenshots 1 & 2. Basically, you are adding appcompat_v7 libraray project to your existing project.

Right Click on the Project and follow the guidelines as showed in Screenshot -1 and Screenshot -2

That should help you.