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    <p>Android library project doesn't run on itself, it is always compiled indirectly, by referencing the library in the dependent application and building that application.</p> <p>The only purpose of R.java generated in library project's gen folder is to accomplish the library project itself, so that IDE won't pop any compile error when seeing code like <code>resources.getString(R.string.c);</code> in the library project. The library project's R.java is more like a temp file, it will never get pushed into application project's apk file.</p> <p>Think the library project as two parts, the pure Java source (my-lib/src/) and Android resources (my-lib/res/). The pure Java source is compiled and end up as my-lib/bin/my-lib.jar (note that there is no R.class file in this so-called temporary jar), when you reference the library project in the application project, it does add my-lib.jar as a dependency in the application project (in Eclipse Package Explorer, check out <code>my-app -&gt; Android Dependencies -&gt; my-lib.jar</code>). The Android resources are globally merged and compiled later when ADT think it is time to do so, usually when application project is built for run/debug. </p> <p>The R java files that get compiled and packed into the final apk are those under application project's gen folder, in the apk file, they are injected under the corresponding package, like so:</p> <pre><code>com/ example/ lib/ R &lt;- com.example.lib.R.java ... ... &lt;- package/class from my-lib.jar app/ R &lt;- com.example.app.R.java ... ... &lt;- package/class from application project </code></pre> <p>The inconsistent R value generated between library and application project is not a problem, this is guaranteed by the SDK design. For you Robolectric pull request, always use R files from application project accordingly.</p> <p>Most of info I mentioned can be found in <a href="http://developer.android.com/tools/projects/index.html#LibraryProjects" rel="nofollow">Library Projects &amp; Development considerations section from official dev guide</a>.</p>
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    1. POAndroid Robolectric Library class support. How to have library class R references load from application project
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    1. POAndroid Robolectric Library class support. How to have library class R references load from application project
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    1. COI understand that I should use the values from the R files that exist in my project. The problem is that there is code in my library project that makes references to the R values (R.string.c) and when robolectric runs, the value is the one defined in the library project. I made several attempts to map values from library project to main project but this fails when you have multiple library projects (whcih some of my projects do), so I gave up on that. Thus, I need to somehow force the classloader to load, and use, the R class from my application project..
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      1. USMatt Wolfe
    2. COAlso note that if I write the the same exact code, getString(R.string.c) in my application code, it will return the value I want, but from the library code that is called right after that, with the same exact line, will return the value from the library project's R class file.. I'm not sure why the class loader does this though.
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      1. USMatt Wolfe
    3. COWhere do you use and write Robolectric test class, in application project or library project? Library project compilation is only constrained by Android SDK, both Maven and Robolectric doesn't care it. If you use and run Robolectric in library project, it would use the value from library project's R file. I usually presume this constraint myself and don't use Robolectric in Library project.
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