Android Eclipse can't generate R file

These days by eclipse whole cry, also blame oneself hand cheap appcompat_v7 to delete.

Eclipse Creation Project If it is compatible below 4.0, it will generate more than one project APPCOMPAT_V7, such as:

This project will be referenced to your target project as a compatibility package and cannot be deleted.
If it is deleted, the R file cannot be generated, and hundreds of errors will run out.

The properties->android of the right-hand side of the project becomes, like, a red fork:

Workaround:

1, if you delete appcompat_v7, did not choose this
，
Then go to the hard drive to completely delete the appcompat_v7;

2, in the work space to create a new project, compatible with the minimum version to maintain the same, so that the workspace will generate a appcompat_v7;

3, the original project right button properties->android, the Red Fork remove, and then add one; The results are as follows:

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Android Eclipse can't generate R file