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1. Adding Support Libraries
2. Using Support Library APIs

• For executing app code, versions of Android lower than Android 5.0 (API level 21) use the Dalvik runtime, and the limitation of using Dalvik is that you can't use more than one classes.dex bytecode file per APK. To overcome this limitation, you will have to add the Multidex support library.
• Android Studio: File New Import Project FirebaseUI-Android path Import project from external model Gradle Use local gradle distribution Select Yes to override existing.Idea file Select Configure when Android framework is detected dialog is displayed.
• Just hover the mouse on class name you want to find usuage and press Ctrl. It will display message ‘show usages of class name’ and click on that class name. The Android studio will display list of usages found.

See also

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 Library 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 Library item.

   Note: If you're developing with Android Studio, select and install the Android Support Repository item instead.

4. Click the Install packages... button.

Figure 1. The Android SDK Manager with theAndroid Support Library 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/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.

Some Support Libraries contain resources beyond compiled code classes, such as images or XML files. For example, the v7 appcompat and v7 gridlayout libraries include resources.

If you are not sure if a library contains resources, check the Support Library Features page. The following sections describe how to add a Support Library with or without resources to your application project.

Adding libraries without resources

To add a Support Library without resources to your application project:

1. Make sure you have downloaded the Android Support Library using the SDK Manager.
2. Create a libs/ directory in the root of your application project.
3. Copy the JAR file from your Android SDK installation directory (e.g., <sdk>/extras/android/support/v4/android-support-v4.jar) into your application's project libs/ directory.
4. Right click the JAR file and select Build Path > Add to Build Path.

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 support library, add the following lines:

Adding libraries with resources

To add a Support Library with resources (such as v7 appcompat for action bar) to your application project:

Create a libraryproject based on the support library code:

1. Make sure you have downloaded the Android Support Library using the SDK Manager.
2. Create a library project and ensure the required JAR files are included in the project's build path:
   1. Select File > Import.
   2. Select Existing Android Code Into Workspace and click Next.
   3. Browse to the SDK installation directory and then to the Support Library folder. For example, if you are adding the appcompat project, browse to <sdk>/extras/android/support/v7/appcompat/.
   4. Click Finish to import the project. For the v7 appcompat project, you should now see a new project titled android-support-v7-appcompat.
   5. In the new library project, expand the libs/ folder, right-click each .jar file and select Build Path > Add to Build Path. For example, when creating the the v7 appcompat project, add both the android-support-v4.jar and android-support-v7-appcompat.jar files to the build path.
   6. Right-click the library project folder and select Build Path > Configure Build Path.
   7. In the Order and Export tab, check the .jar files you just added to the build path, so they are available to projects that depend on this library project. For example, the appcompat project requires you to export both the android-support-v4.jar and android-support-v7-appcompat.jar files.
   8. Uncheck Android Dependencies.
   9. Click OK to complete the changes.

You now have a library project for your selected Support Library that you can use with one or more application projects.

Add the library to your application project:

1. In the Project Explorer, right-click your project and select Properties.
2. In the category panel on the left side of the dialog, select Android.
3. In the Library pane, click the Add button.
4. Select the library project and click OK. For example, the appcompat project should be listed as android-support-v7-appcompat.
5. In the properties window, click OK.

Note: If you are using the android-support-v7-mediarouter support library, you should note that it depends on the android-support-v7-appcompat library. In order for the v7 mediarouter library to compile, you must import both library projects into your development workspace. Then follow the procedure above to add the v7 appcompat project as a library to the v7 mediarouter library 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 feature project identifier to the dependencies section. For example, to include the appcompat project add compile 'com.android.support:appcompat-v7:18.0.+' to the dependencies section, as shown in the following example:

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:

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• android.support.v7.app.ActionBar when using the Support Library.
• android.app.ActionBar when developing only for API level 11 or higher.

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:

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This change tells Google Play that your application can be installed on devices with Android 2.1 (API level 7) and higher.

Note: If you are including the v4 support and v7 appcompat libraries in your application, you should specify a minimum SDK version of '7' (and not '4'). The highest support library level you include in your application determines the lowest API version in which it can operate.

Code Samples

Each Support Library includes code samples to help you get started using the supportAPIs. The code is included in the download from the SDK Manager and is placed inside the AndroidSDK installation directory, as listed below:

• 4v Samples: <sdk>/extras/android/support/samples/Support4Demos/
• 7v Samples: <sdk>/extras/android/support/samples/Support7Demos/
• 13v Samples: <sdk>/extras/android/support/samples/Support13Demos/
• App Navigation: <sdk>/extras/android/support/samples/SupportAppNavigation/

Firestore’s DocumentSnapshot.toObject - RuntimeException: Could not deserialize object. Class does not define a no-argument constructor. If you are using ProGuard, make sure these constructors are not stripped

I am using Firestore’s DocumentSnapshot.toObject, which complaint of the above error in release build.

The reason is minifyEnabled true being used, which stripped away unused code/constructor which is required by DocumentSnapshot.toObject.

To solve this issue, use @Keepon single classes/methods/fields that you don’t want removed or renamed by ProGuard.

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NOTE: Proguard seems to target stripping of inner class (LastQuote) only at the moment, thus @Keep is not required for UserQuoteHistory.

References:

Android Studio Find Unused Classes Free