I have two projects and I want to combine them together.When I install each of them separately on device ,”Open” button (in page that has been represented after successful installation) is enabled.But when I combine them,”Open” button will be disabled, although installation process will be completed successful.I guess that this error is because of manifest file,but I am not sure.Thanks you in regards your time.

I have two projects and I want to combine them together.When I install each
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I can’t say for certain without seeing your manifest, but my guess is that when you combined the two projects, you ended up with two activities that each included:
If you make sure to only say that in the activity you want to open with the “Open” button, I imagine it will work.
Edit: To be clear, it’s fine to have multiple entry points like this, but it still seems likely to explain that “Open” button being disabled, since it’s ambiguous what it should do.