how to use an external jar

Question

I read a lot about this issue but I still can´t do it work.

I have two projects: one does some stuff and what I want to do is set it as jar file and use it in the main project, call it and take the info I don´t know how to instanciate a class of that package to start with the process. The secondary project works fine alone and I want to take the info and use it in the main project. If I set the secondary as Library and add it to the main it works fine but I don´t want to do it in this way.

I think it´s possible to do it but I don´t know how to instantiate a class from a jar file and I´m starting to be desperate.

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this is the logCat when I call the activity in the jared

file 03-22 11:04:57.900: E/AndroidRuntime(11895): FATAL EXCEPTION: main
03-22 11:04:57.900: E/AndroidRuntime(11895): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.suscribir/com.example.suscribir.Suscribir}; have you declared this activity in your AndroidManifest.xml?
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.app.Activity.startActivityForResult(Activity.java:2827)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.app.Activity.startActivity(Activity.java:2933)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at com.example.principal.Principal$1.onClick(Principal.java:37)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.view.View.performClick(View.java:2485)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.view.View$PerformClick.run(View.java:9080)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.os.Handler.handleCallback(Handler.java:587)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.os.Looper.loop(Looper.java:130)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at android.app.ActivityThread.main(ActivityThread.java:3687)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at java.lang.reflect.Method.invokeNative(Native Method)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at java.lang.reflect.Method.invoke(Method.java:507)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-22 11:04:57.900: E/AndroidRuntime(11895):    at dalvik.system.NativeStart.main(Native Method)

this is how I call the Activity with an intent

intent.setAction(Intent.ACTION_MAIN);
                intent.setClassName("com.example.suscribir", "com.example.suscribir.Suscribir");
                startActivity(intent);

this is the Manifest

<activity
    android:name="com.example.suscribir.Suscribir">
</activity>

If you need more info, just tell me Thanks again

Answer 1

http://androiddevelopement.blogspot.in/2011/01/creating-jar-file-in-eclipse.html. Creating jar from eclipse

Cannot package resources, manifest entries. Pure Java code (perhaps using Android APIs), can be packaged into jars.

To use it , just copy the jar to your libs folder under the project.

Right click on project. Goto Properties. Java Build Path. Click Add Jars. Add jar from your libs folder.

After that you can use import statement and instantiate it in your new project class.

Answer 2

I'm not completely sure if I understand your question right. You have two Android applications that use the same classes? Is that right? You need to extract the common classes into a Library project in that case. I don't think that you can reference one Android Application project from another.