Method to use existing project into newer one in Android

Question

I tried to use one android project to another android project for this purpose I use

Properties--->Build Path-->Project--->Add(Select the project then add it) -->Order and Export--> select project

But this gives the following error:

07-26 11:03:09.878: E/AndroidRuntime(573): FATAL EXCEPTION: main
07-26 11:03:09.878: E/AndroidRuntime(573): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.gps_test_prt/com.example.gps_test_prt.GPS_prt_main}: java.lang.ClassNotFoundException: com.example.gps_test_prt.GPS_prt_main
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.os.Looper.loop(Looper.java:137)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread.main(ActivityThread.java:4340)
07-26 11:03:09.878: E/AndroidRuntime(573):  at java.lang.reflect.Method.invokeNative(Native Method)
07-26 11:03:09.878: E/AndroidRuntime(573):  at java.lang.reflect.Method.invoke(Method.java:511)
07-26 11:03:09.878: E/AndroidRuntime(573):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-26 11:03:09.878: E/AndroidRuntime(573):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-26 11:03:09.878: E/AndroidRuntime(573):  at dalvik.system.NativeStart.main(Native Method)
07-26 11:03:09.878: E/AndroidRuntime(573): Caused by: java.lang.ClassNotFoundException: com.example.gps_test_prt.GPS_prt_main
07-26 11:03:09.878: E/AndroidRuntime(573):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
07-26 11:03:09.878: E/AndroidRuntime(573):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
07-26 11:03:09.878: E/AndroidRuntime(573):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
07-26 11:03:09.878: E/AndroidRuntime(573):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870)
07-26 11:03:09.878: E/AndroidRuntime(573):  ... 11 more

`

Please help.

Thanks

Answer 1

It seems you class cannot be instantiated. This may be :

1. Visibility isn't public, or no public constructor
2. Activity not declared in the manifest of your using application
3. Android Dependencies or Android Private Libraries not exported in your library or final project

Answer 2

在Properties ---> Android-> Add中选择库项目，如果您使用的是ADT 22，请在Order＆Export选项卡中检查Android Dependencies和Android Private Libraries。