如何在Android Studio中向现有项目添加新活动 - “Project not ready”

Question

What needs to be done to add a new activity to existing project that works and compiles but has "Project not ready" in the menu. Please see the picture.

Other than that all works, so I don't know what IDE means by "Project not ready"

Answer 1

This is a little bit over a year but i thought i would provide an answer for anyone (novice like me) who may encounter the same problem. I had the exact same problem as depicted and denoted. It was fixed by

• Cleaning the project (Build --> Clean Project)
• Sync with Gradle ( Tools --> Android --> Sync project with Gradle files)

Answer 2

(Not an exact answer) Observation:

I don't know exactly what happened, but it works now, all I could notice is that gradle had some error from unclean build likely I must have had some code changes resulting in invisible compilation errors. After good build menus available again.

Please post your "observation" if you don't know exact answer.

Thanks

Answer 3

If you want to add a Activity to an android application, you have to Extend Activity from one of your classes like this:

public class SecondActivity extends Activity

And add that activity to your manifest.

       <activity
            android:name=".ActivitySecondClass"
            android:label="@string/app_name2" >

        </activity>

You have to give the project time to build first. Wait a minute or two before jumping in.

Answer 4

I had the same issue. I fixed it by clearing the cache. (File > Invalidate caches & Restart).