Java android get app version

Implement In-app Update In Android

Make sure every user of your app is on the new version.

Apr 6, 2020 · 8 min read

In this article, we will learn about the In-app update feature in Android what is all about In-app update, what are the benefits of using the In-app update in your android application. Recently I’ve been working on a product in which I need to Implement an In-app update Why we need to Implement this?.

As a Developer we always want our users to have the updated version of their application but there are a lot of people who actually turned off their auto update from google play store and he/she doesn’t know about any update available or not.

To overcome the problem Google Introduced this feature called In-app update from this feature you can easily prompt the user to update the application and with the user permission you can update the application also while updating the app user can be able to interact with the application. Now the user doesn’t need to go to google play store to check there is any update available or not.

What is In-App Update:

An In-app update was Introduced as a part of the Play Core Library, which actually allows you to prompts the user to update the application when there is any update available on the Google Play Store.

There are two modes of an In-app update.

• Flexible Update
• Immediate Update

Flexible Update:

In Flexible update, the dialog will appear and after the update, the user can interact with the application.

This mode is recommended to use when there is no major change In your application like some features that don’t affect the core functionality of your application.

The update of the application is downloading in the background in the flexible update and after the completion of the downloading, the user will see the dialog in which the user needs to restart the application. The dialog will not automatically show, we need to check and show to the user and we will learn how later.

Benefits:

The major benefit of the flexible update is the user can interact with the application.

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Get Started

Integrating the Google Mobile Ads SDK into an app is the first step toward displaying ads and earning revenue. Once you’ve integrated the SDK, you can choose an ad format (such as native or rewarded video) and follow the steps to implement it.

Before you begin

To prepare your app, complete the steps in the following sections.

App prerequisites

Use Android Studio 3.2 or higher

Make sure that your app’s build file uses the following values:

• A minSdkVersion of 16 or higher
• A compileSdkVersion of 28 or higher

Set up your app in your AdMob account

Register your app as an AdMob app by completing the following steps:

Register your app with AdMob. This step creates an AdMob app with a unique AdMob App ID that is needed later in this guide.

Configure your app

In your project-level build.gradle file, include Google’s Maven repository and Maven central repository in both your buildscript and allprojects sections:

Add the dependencies for the Google Mobile Ads SDK to your module’s app-level Gradle file, normally app/build.gradle :

Add your AdMob app ID (identified in the AdMob UI) to your app’s AndroidManifest.xml file. To do so, add a tag with android:name=»com.google.android.gms.ads.APPLICATION_ID» . You can find your app ID in the AdMob UI. For android:value , insert your own AdMob app ID, surrounded by quotation marks.

In a real app, use your actual AdMob app ID, not the one listed above. If you’re just looking to experiment with the SDK in a Hello World app, you can use the sample app ID shown above.

Note also that failure to add the tag as shown above results in a crash with the message:

(Optional) Declare AD_ID permission for previous versions to work with Android S.

If your app uses the Google Mobile Ads SDK version 20.4.0 or higher, you can skip this step since the SDK automatically declares the com.google.android.gms.permission.AD_ID permission and is able to access the Advertising ID whenever it’s available.

For apps that use the Google Mobile Ads SDK version 20.3.0 or lower and are targeting Android S, you must add the com.google.android.gms.permission.AD_ID permission in the AndroidManifest.xml file in order to target Android S:

To learn more about the com.google.android.gms.permission.AD_ID permission declaration, including how to disable it, please refer to this Play Console article.

Initialize the Google Mobile Ads SDK

Before loading ads, have your app initialize the Google Mobile Ads SDK by calling MobileAds.initialize() which initializes the SDK and calls back a completion listener once initialization is complete (or after a 30-second timeout). This needs to be done only once, ideally at app launch.

Ads may be preloaded by the Google Mobile Ads SDK or mediation partner SDKs upon calling MobileAds.initialize() . If you need to obtain consent from users in the European Economic Area (EEA), set any request-specific flags (such as tagForChildDirectedTreatment or tag_for_under_age_of_consent ), or otherwise take action before loading ads, ensure you do so before initializing the Google Mobile Ads SDK.

Here’s an example of how to call the initialize() method in an Activity:

Example MainActivity (excerpt)

Kotlin

If you’re using mediation, wait until the completion handler is called before loading ads, as this will ensure that all mediation adapters are initialized.

Select an ad format

The Google Mobile Ads SDK is now imported and you’re ready to implement an ad. AdMob offers a number of different ad formats, so you can choose the one that best fits your app’s user experience.

Banner

Rectangular ads that appear at the top or bottom of the device screen. Banner ads stay on screen while users are interacting with the app, and can refresh automatically after a certain period of time. If you’re new to mobile advertising, they’re a great place to start.

Interstitial

Full-screen ads that cover the interface of an app until closed by the user. They’re best used at natural pauses in the flow of an app’s execution, such as between levels of a game or just after a task is completed.

Native

Customizable ads that match the look and feel of your app. You decide how and where they’re placed, so the layout is more consistent with your app’s design.

Rewarded

Ads that reward users for watching short videos and interacting with playable ads and surveys. Used for monetizing free-to-play apps.

Additional resources

The Google Mobile Ads repository on GitHub demonstrates how to use the different ad formats that this API offers.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

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Save data in a local database using Room Part of Android Jetpack.

Apps that handle non-trivial amounts of structured data can benefit greatly from persisting that data locally. The most common use case is to cache relevant pieces of data so that when the device cannot access the network, the user can still browse that content while they are offline.

The Room persistence library provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite. In particular, Room provides the following benefits:

• Compile-time verification of SQL queries.
• Convenience annotations that minimize repetitive and error-prone boilerplate code.
• Streamlined database migration paths.

Because of these considerations, we highly recommend that you use Room instead of using the SQLite APIs directly.

Setup

To use Room in your app, add the following dependencies to your app’s build.gradle file:

Groovy

Kotlin

Primary components

There are three major components in Room:

• The database class that holds the database and serves as the main access point for the underlying connection to your app’s persisted data.
• Data entities that represent tables in your app’s database.
• Data access objects (DAOs) that provide methods that your app can use to query, update, insert, and delete data in the database.

The database class provides your app with instances of the DAOs associated with that database. In turn, the app can use the DAOs to retrieve data from the database as instances of the associated data entity objects. The app can also use the defined data entities to update rows from the corresponding tables, or to create new rows for insertion. Figure 1 illustrates the relationship between the different components of Room.

Figure 1. Diagram of Room library architecture.

Sample implementation

This section presents an example implementation of a Room database with a single data entity and a single DAO.

Data entity

The following code defines a User data entity. Each instance of User represents a row in a user table in the app’s database.

Kotlin

To learn more about data entities in Room, see Defining data using Room entities.

Data access object (DAO)

The following code defines a DAO called UserDao . UserDao provides the methods that the rest of the app uses to interact with data in the user table.

Kotlin

Database

The following code defines an AppDatabase class to hold the database. AppDatabase defines the database configuration and serves as the app’s main access point to the persisted data. The database class must satisfy the following conditions:

• The class must be annotated with a @Database annotation that includes an entities array that lists all of the data entities associated with the database.
• The class must be an abstract class that extends RoomDatabase .
• For each DAO class that is associated with the database, the database class must define an abstract method that has zero arguments and returns an instance of the DAO class.

Kotlin

Note: If your app runs in a single process, you should follow the singleton design pattern when instantiating an AppDatabase object. Each RoomDatabase instance is fairly expensive, and you rarely need access to multiple instances within a single process.

If your app runs in multiple processes, include enableMultiInstanceInvalidation() in your database builder invocation. That way, when you have an instance of AppDatabase in each process, you can invalidate the shared database file in one process, and this invalidation automatically propagates to the instances of AppDatabase within other processes.

Usage

After you have defined the data entity, the DAO, and the database object, you can use the following code to create an instance of the database:

Kotlin

You can then use the abstract methods from the AppDatabase to get an instance of the DAO. In turn, you can use the methods from the DAO instance to interact with the database:

Kotlin

Additional resources

To learn more about Room, see the following additional resources:

Sample

• Android Sunflower, a gardening app that illustrates Android development best practices with Android Jetpack.
• Tivi, a TV show tracking app that uses the latest libraries and tools.

Codelabs

Blogs

Content and code samples on this page are subject to the licenses described in the Content License. Java is a registered trademark of Oracle and/or its affiliates.

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Get started with the Navigation component

This topic shows you how to set up and work with the Navigation component. For a high level overview of the Navigation component, see the Navigation overview.

Set up your environment

To include Navigation support in your project, add the following dependencies to your app’s build.gradle file:

Groovy

Kotlin

For information on adding other Architecture Components to your project, see Adding components to your project.

Create a navigation graph

Navigation occurs between your app’s destinations—that is, anywhere in your app to which users can navigate. These destinations are connected via actions.

A navigation graph is a resource file that contains all of your destinations and actions. The graph represents all of your app’s navigation paths.

Figure 1 shows a visual representation of a navigation graph for a sample app containing six destinations connected by five actions. Each destination is represented by a preview thumbnail, and connecting actions are represented by arrows that show how users can navigate from one destination to another.

Figure 1. A navigation graph that shows previews of six different destinations that are connected via five actions.

1. Destinations are the different content areas in your app.
2. Actions are logical connections between your destinations that represent paths that users can take.

To add a navigation graph to your project, do the following:

1. In the Project window, right-click on the res directory and select New > Android Resource File. The New Resource File dialog appears.
2. Type a name in the File name field, such as «nav_graph».
3. Select Navigation from the Resource type drop-down list, and then click OK.

When you add your first navigation graph, Android Studio creates a navigation resource directory within the res directory. This directory contains your navigation graph resource file ( nav_graph.xml , for example).

Navigation Editor

After adding a graph, Android Studio opens the graph in the Navigation Editor. In the Navigation Editor, you can visually edit navigation graphs or directly edit the underlying XML.

Figure 2. The Navigation Editor

1. Destinations panel: Lists your navigation host and all destinations currently in the Graph Editor.
2. Graph Editor: Contains a visual representation of your navigation graph. You can switch between Design view and the underlying XML representation in the Text view.
3. Attributes: Shows attributes for the currently-selected item in the navigation graph.

Click the Text tab to see the corresponding XML, which should look similar to the following snippet:

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