[Android SDK] importing PullToRefresh to Gradle, for using in Android Studio

com.handmark.PullToRefresh is an excellent library. A pity it’s no longer being maintained, and has no gradle dependency.

Luckily, we can import the libproject “as it is” and compile it using Gradle. These are the steps.

1.- First of all, you need to download the libproject clicking on the “download ZIP” button found in the project’s GitHub site.

2.- Create an empty Android Studio project, let’s name it “PrjLibDeps”. Make sure it compiles succesfully and shows the “Hello World, PrjLibDeps” text before going to next step.

3.- In the project’s root folder, create a folder called “libs”, and place the “pulltorefresh” folder inside. The structure must remain as follows:

PrjLibdeps
|   settings.gradle
|   build.gradle
|   libs
      |    pulltorefresh
                 | src, res, LICENSE, pom.xml...
|  app/
    |   build.gradle
    |   src
| ...

4.- Now, inside “pulltorefresh” folder, create a file named “build.gradle”. If there is one, replace it. Copy and paste this dummy content we’re going to change later:

apply plugin: 'com.android.library'

dependencies {
   compile 'com.android.support:support-v4:21.0.3'
}

android {
   compileSdkVersion 20
   buildToolsVersion "20.0.0"

 defaultConfig {
   minSdkVersion 9
   targetSdkVersion 20
 }

 sourceSets {
   main {
     manifest.srcFile 'AndroidManifest.xml'
     java.srcDirs = ['src']
     res.srcDirs = ['res']
     }
   }
}

5.- Now replace compileSdkVersion, buildToolsVersion, minSdkVersion, and targetSdkVersion with values that are valid in your Android SDK installation. The easiest way is to set the same values found in app/build.gradle file.

6.- Now edit app/build.gradle, and add these dependencies.

dependencies {
   compile project(":PullToRefresh")
   // Leave the previous dependencies (if any) unmodified
}

7.- Edit settings.gradle, located in the project’s root directory. Add these lines

include ‘:app', ':PullToRefresh'
project (':PullToRefresh').projectDir = new File('libs/pulltorefresh')

8.- A yellow message saying “Gradle files have changed since las project sync …” might appear on the upper right. Click on “Sync now” to make gradle synchronize all resources.

9.- After gradle sync has finished, press CMD+F9 to Make the whole project. If you’ve done all steps correctly, you might get success 🙂 At least I could make it work with these exact steps. More import examples can be found at: SO question 1, SO question 2.

Let me know any issues.

Have a nice coding day!!

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