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Generating a Signed Release APK File in Android Studio. You are currently reading the Android Studio 1. Android 5 Edition of this book. Purchase the fully updated Android Studio 2. Android 7 Edition of this publication in e.

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Once the development work on an Android application is complete and it has been tested on a wide range of Android devices, the next step is to prepare the application for submission to the Google Play App Store. Before submission can take place, however, the application must be packaged for release and signed with a private key. This chapter will work through the steps involved in obtaining a private key and preparing the application package for release. Building an application package for release to customers via the Google Play store, on the other hand, requires that some additional steps be taken.

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The first requirement is that the application be compiled in release mode instead of debug mode. Secondly, the application must be signed with a private key that uniquely identifies you as the application’s developer. Finally, the application package must be aligned.

This is simply a process by which some data files in the application package are formatted with a certain byte alignment to improve performance. This is achieved using the Build Variants tool window which can be accessed from the tool window quick access menu (located in the bottom left hand corner of the Android Studio main window as shown in Figure 5. The next step is to configure signing key information for use when generating the signed application package.

In the event that you have yet to create a keystore file, click on the Create new. Click on the button to the right of the Key store path field and navigate to a suitable location on your file system, enter a name for the keystore file (for example release. OK button. The top section relates to the keystore file. In this section, enter a strong password with which to protect the keystore file into both the Password and Confirm fields. The lower section of the dialog relates to the release key that will be stored in the key store file. Within the Key section of the New Key Store dialog, enter the following details. An alias by which the key will be referenced.

This can be any sequence of characters, though only the first 8 are used by the system. A suitably strong password to protect the key. The number of years for which the key is to be valid (Google recommends a duration in excess of 2. In addition, information must be provided for at least one of the remaining fields (for example your first and last name or organization name).

At this point the Generate Signed APK Wizard dialog should still be displayed with the keystore path, passwords and key alias fields populated with information. Assuming that the settings are correct, click on the Next button to proceed to the APK generation screen (Figure 5. Within this screen, review the Destination APK path: setting to verify that the location into which the APK file will be generated is acceptable. In the event that another location is preferred, click on the button to the right of the text field and navigate to the desired file system location. At this point the Gradle system will compile the application in release mode.

Once the build is complete, a dialog will appear providing the option to open the folder containing the APK file in an explorer window. At this point the application is ready to be submitted to the Google Play store. Once submitted, the application will be available for download from the Google Play App Store. To do so, navigate to https: //play. Note that there is a one- time $2. Karaoke On Pc 2008 Pro Song Pack 3D Animated Lyrics Full Pack on this page.

Once an application goes on sale, Google will keep 3. In order to bring your application to market, the following information will be required.

Title – The title of the application. Description – Up to 4.

Screenshots – Up to 8 screenshots of your application running (a minimum of two is required). Google recommends submitted screenshots of the application running on a 7” or 1. Language – The language of the application (the default is US English). Promotional Text – The text that will be used when your application appears in special promotional features within the Google Play environment.

Application Type – Whether your application is considered to be a game or an application. Category – The category that best describes your application (for example finance, health and fitness, education, sports etc.).

Locations – The geographical locations into which you wish your application to be made available for purchase. Contact Information – Methods by which users may contact you for support relating to the application. Options include web, email and phone. Pricing & Distribution – Information about the price of the application and the geographical locations where it is to be marketed and sold. Having collected the above information and prepared the application package file for release, simply follow the steps in the Google Play Developer Console to submit the application for testing and sale.

If an attempt is made to upload another APK file with the same version code number, the console will reject the file with the following error. You need to use a different version code for your APK because you already have one with version code 1.

This is performed in the module level build. Figure 5. 4- 9. It is important to note that this is not the top level build. By default, this file will typically read as follows. To also change the version number displayed to users of your application, change the version.

Name string. For example. Name . As outlined in this chapter, all of these steps can be performed with relative ease through the use of the Android Studio build system.