Android Copy an activity

Two days ago, a half-day code, every time to enter the A-interface program on the collapse ... My Java class and the corresponding layout are not any errors, the best solution, but also suddenly think of myself as if I had encountered similar problems. That is, copying an activity (. java&.xml) from another project, but not being associated at the configuration file, causes the program to run into the interface once it runs. So, look at their own androidmanifest.xml file, add the associated code inside to run the program again, and finally solved. The problem is really retarded, but the memory is not good when it is very annoying to meet it, so write down.

        <activity            android:name= "com.example.testdb.ChooseTypeActivity"            android:label= "@string/title_ Activity_spinner ">        </activity>

　　

Android Copy an activity