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POHow to build an android library with Android Studio and gradle?
 

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  1. POHow to build an android library with Android Studio and gradle?
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    <p>I am trying to migrate a project from Eclipse but nothing I have tried is working. In Eclipse I have 3 projects (2 android app projects and 1 android library project). The 2 app projects depend on the library project. When I do the gradle export I get 3 projects that don't work. I am open to restructuring the project but haven't found any documentation on how this should be done.</p> <p>Is there a way to make the 3 projects that Eclipse exports work together? Am I better off restructuring things and if so is documentation for how this should be done?</p> <p><strong>Update</strong></p> <p>I have uploaded the entire project to GitHub <a href="https://github.com/respectTheCode/android-studio-library-example">https://github.com/respectTheCode/android-studio-library-example</a></p> <p><strong>Update 1</strong></p> <p>Based the suggestions from Padma Kumar this is what I have tried.</p> <ol> <li>Create a new Project called <code>MyApp</code></li> <li>Click <code>File &gt; New Module</code>, choose <code>Android Library</code> and name it <code>MyLib</code></li> <li>Click <code>Build &gt; Make Project</code></li> </ol> <p>The build fails with this error</p> <pre><code>Module "MyLib" was fully rebuilt due to project configuration/dependencies changes Compilation completed with 1 error and 0 warnings in 19 sec 1 error 0 warnings /.../MyApp/MyLib/build/bundles/debug/AndroidManifest.xml Gradle: &lt;manifest&gt; does not have package attribute. </code></pre> <p>I then added a <code>package</code> attribute to the manifest making it</p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.mylib" &gt; </code></pre> <p>After building I get this error</p> <pre><code>Module "MyApp" was fully rebuilt due to project configuration/dependencies changes Compilation completed with 2 errors and 0 warnings in 13 sec 2 errors 0 warnings /.../MyApp/MyLib/src/main/java/com/example/mylib/MainActivity.java Gradle: package R does not exist Gradle: package R does not exist </code></pre> <p>Adding dependency doesn't seem to have any impact on the error. Continuing from above</p> <ol> <li>Click <code>File &gt; Project Structure &gt; Modules &gt; MyApp-MyApp</code></li> <li>Switch to <code>Dependencies</code> Tab</li> <li>Click <code>+ &gt; Module Dependency</code> and pick <code>MyLib</code></li> <li>Click <code>Apply</code> and <code>OK</code></li> <li>Click <code>Build &gt; Make Project</code></li> </ol> <p><strong>Update 2</strong></p> <p>Based the suggestions from Ethan this is where we get</p> <p>The 2 sub project <code>build.gradle</code> seem to have all of the correct parts and the only difference is the plugin line bellow is the <code>MyApp/build.gradle</code>.</p> <pre><code>buildscript { repositories { maven { url 'http://repo1.maven.org/maven2' } } dependencies { classpath 'com.android.tools.build:gradle:0.4' } } apply plugin: 'android' dependencies { compile files('libs/android-support-v4.jar') } android { compileSdkVersion 17 buildToolsVersion "17.0.0" defaultConfig { minSdkVersion 7 targetSdkVersion 16 } } </code></pre> <p>The root project <code>build.gradle</code> was empty so I added the two projects like this</p> <pre><code>dependencies { compile project(":MyLib") compile project(":MyApp") } </code></pre> <p>I now get this error when building</p> <pre><code>Gradle: FAILURE: Build failed with an exception. * Where: Build file '/Users/kevin/GitHub/AppPress/MyApp/build.gradle' line: 2 * What went wrong: A problem occurred evaluating root project 'MyApp'. &gt; Could not find method compile() for arguments [project ':MyLib'] on root project 'MyApp'. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. </code></pre> <p><strong>Update 3</strong></p> <p>Big thanks Ethan for solving this.</p> <ol> <li>Add <code>compile project(':SubProjects:MyLib')</code> to the <code>MyLib/build.gradle</code></li> <li>Remove <code>compile files('libs/android-support-v4.jar')</code> from the <code>MyLib/build.gradle</code></li> <li>Close project and Import the root project from gradle</li> </ol> <p><strong>Update 4</strong></p> <p>As of 0.1.2 you can now include <code>compile "com.android.support:support-v4:13.0.0"</code> instead of <code>compile files('libs/android-support-v4.jar')</code>. Since it is coming from mavin now you can include this in multiple projects without problems.</p> <pre><code>buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.4.2' } } apply plugin: 'android' dependencies { compile "com.android.support:support-v4:13.0.0" compile project(':SubProjects:MyLib') } </code></pre> <p><strong>Update 5</strong></p> <p>As of 0.1.3 there is now a "Sync Project" button in the toolbar. You can click that instead of reimporting your project after making changes to <code>.gradle</code> files.</p>
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    1. COI made a pull request for your github project. There were 2 simple changes. Remove the content from your /build.gradle. { I did this because you didn't define what kind of project it was, so it was complaining about not knowing what to to with it }, then I added the dependency from :SubProject:MyLib to :SubProject:MyApp. I then ran ./gradlew :SubProject:MyApp:iD (iD maps to installDebug). I also had to remove the duplicate libs/android-support-v4.jar. Since it's not a 'real' dependency, you can't have it in two places.
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    2. COI commented on the pull request. https://github.com/respectTheCode/android-studio-library-example/pull/1
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    3. COIt's worth mentioning, if you add `compile 'com.google.android:support-v4:r6'` to each of your projects and the maven plugin (like in the build.gradle example below) instead of the `compile files('libs/android-support-v4.jar')` gradle will realize that both projects include the same thing and will only include it once.
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