CODEWITHSUNDEEP
androidgoogle-app-engine
Adam
Adam

Reputation: 957

How do I make a basic App Engine Connected Android Project?

I'm new to this, so please bear with me. I simply want to get the basic App Engine Connected Android Project to work in eclipse.

I first downloaded Eclipse 3.7 and the Android SDK. I installed the ADT plugin through eclipse. I configured eclipse to point to the sdk and created an android project. I added some widgets, messed around with SMS messages, and ran it on my phone. Worked like a charm.

Then I decided it was time to work with app engine. I downloaded the Google plugin for eclipse from within eclipse using this link http://dl.google.com/eclipse/plugin/3.7. I also downloaded the Google App Engine Java SDK from that link.

Ok, here's where it gets more fun. I created a new app engine connected android project and named it "TestProjectThree". I then clicked "Debug as->local app engine connected android project". On the console I got a url, but on my phone I got a black screen. I then noticed that there was nothing in the android/gen folder, so I did a clean build of both projects. Suddenly, it gave me 10 warnings.

"Cannot fully validate context since domain type com.testprojectthree.server.HelloWorldService is not available.

You must run the ValidationTool as part of your server build process."

I googled the problem and found this link http://code.google.com/p/google-web-toolkit/wiki/RequestFactoryInterfaceValidation.

I began following the instructions. I tried to enable annotation processing, but it was already enabled. I tried to add the requestfactory-apt.jar to the factory path, but it was already there too.

Apparently now I need to run something called an Annotation Processor. I've never used Maven before but I right click on my android project->configure->convert to Maven project. I do a clean build and a POM file appears. I then copy all of the XML from that link to the line right above the /project line in the POM file. I copy the second bit too because I'm using indigo. Clean and build again. New error.

"/TestProjectThree-Android/gen already exists but is not a source folder. Convert to a source folder or rename it."

No idea what that one means either, but I see right click gen->build path->convert to source folder so I click that too. Clean and build again. NO ERRORS!! YAYAYAY!!!

Debug as local app engine connected android project. Got a black screen on the phone, and some sort of error in eclipse. “Source not found”. Looked for a more detailed error message but the console just has the app engine url on it and logcat looks empty.

I went back to the link about the validation tool and read all the comments. A lot of people seemed confused. I have no idea if I did it right, or did any of it right, and am very lost now. Please please please help me!!!

Upvotes: 3

Views: 974

Answers (2)

Zen
Zen

Reputation: 2728

Use parse. I tried using AppEnging for my app's backend, but parse seems to take care of a lot of backend jobs and makes life extremely easy https://parse.com

Upvotes: 0

Andrew Mackenzie
Andrew Mackenzie

Reputation: 5745

This sounds very similar to a problem I had, although not exactly.

I think the code generated by the AppEngine project that is used by the Android project is either not generated correctly, or needs a refresh.....and clean doesn't do it.

Try this:

First, make sure the requestfactory-apt.jar was in the "Factory Path" of "Annotation Processing" in the "Java Compiler" section of Project Properties.

In AppEngine project. Properties-> Java Build Path, Source section. Select the ".apt_generated" entry and then "edit…" and rename it, by putting a "1" at the end of the name (or whatever). Project -> Clean

then in Android Project Properties-> Java Build Path, Source section. Select the "apt_generated" source folder that is linked to the ".apt_generated" source folder in the AppEngine project. "Edit…", then in the first line "Linked Folder Location" navigate to the NEWLY named folder in the AppEngine project (the one with the "1" at the end……) Then Project -> Clean

Then build & run your Android project, it should now have newly generated RequestFactory code from AppEngine project and validate OK at runtime.

It's possible that closing and opening projects and cleans were also required.

Upvotes: 1

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