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Support Library Setup

How you setup the Android Support Libraries in your development project depends on what features you want to use and what range of Android platform versions you want to support with your application.

This document guides you through downloading the Support Library package and adding libraries to your development environment.

Downloading the Support Libraries

The Android Support Repository package is provided as a supplemental download to the Android SDK and is available through the Android SDK Manager. Follow the instructions below to obtain the Support Library files.

To download the Support Library through the SDK Manager:

  1. Start the Android SDK Manager.
  2. In the SDK Manager window, scroll to the end of the Packages list, find the Extras folder and, if necessary, expand to show its contents.
  3. Select the Android Support Repository item.
  4. Click the Install packages... button.

Figure 1. The Android SDK Manager with Android Support Repository selected.

After downloading, the tool installs the Support Library files to your existing Android SDK directory. The library files are located in the following subdirectory of your SDK: <sdk>/extras/android/m2repository/com/android/support/ directory.

Choosing Support Libraries

Before adding a Support Library to your application, decide what features you want to include and the lowest Android versions you want to support. For more information on the features provided by the different libraries, see Support Library Features.

Adding Support Libraries

In order to use a Support Library, you must modify your application's project's classpath dependencies within your development environment. You must perform this procedure for each Support Library you want to use.

To add a Support Library to your application project:

  1. Make sure you have downloaded the Android Support Repository using the SDK Manager.
  2. Open the build.gradle file for your application.
  3. Add the support library to the dependencies section. For example, to add the v4 core-utils library, add the following lines:
    dependencies {
        ...
        compile "com.android.support:support-core-utils:24.2.0"
    }
    

Caution: Using dynamic dependencies (for example, palette-v7:23.0.+) can cause unexpected version updates and regression incompatibilities. We recommend that you explicitly specify a library version (for example, palette-v7:24.2.0).

Using Support Library APIs

Support Library classes that provide support for existing framework APIs typically have the same name as framework class but are located in the android.support class packages, or have a *Compat suffix.

Caution: When using classes from the Support Library, be certain you import the class from the appropriate package. For example, when applying the ActionBar class:

Note: After including the Support Library in your application project, we strongly recommend using the ProGuard tool to prepare your application APK for release. In addition to protecting your source code, the ProGuard tool also removes unused classes from any libraries you include in your application, which keeps the download size of your application as small as possible. For more information, see ProGuard.

Further guidance for using some Support Library features is provided in the Android developer training classes, guides and samples. For more information about the individual Support Library classes and methods, see the android.support packages in the API reference.

Manifest Declaration Changes

If you are increasing the backward compatibility of your existing application to an earlier version of the Android API with the Support Library, make sure to update your application's manifest. Specifically, you should update the android:minSdkVersion element of the <uses-sdk> tag in the manifest to the new, lower version number, as shown below:

  <uses-sdk
      android:minSdkVersion="14"
      android:targetSdkVersion="23" />

The manifest setting tells Google Play that your application can be installed on devices with Android 4.0 (API level 14) and higher.

If you are using Gradle build files, the minSdkVersion setting in the build file overrides the manifest settings.

apply plugin: 'com.android.application'

android {
    ...

    defaultConfig {
        minSdkVersion 16
        ...
    }
    ...
}

In this case, the build file setting tells Google Play that the default build variant of your application can be installed on devices with Android 4.1 (API level 16) and higher. For more information about build variants, see Build System Overview.

Note: If you are including several support libraries, the minimum SDK version must be the highest version required by any of the specified libraries. For example, if your app includes both the v14 Preference Support library and the v17 Leanback library, your minimum SDK version must be 17 or higher.

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