A complete guide to Android Instant App

Step 1 : Install Instant App SDK

Manufacture an Android Instant App, we have to introduce the SDK. Go to Tools >Android > SDK Manager. Tap on the “SDK Tools” tab and introduce “Moment Apps Development SDK” by checking the crate and hitting “Apply”.

Step 2 : Android Source Code

In this progression, we will change over the existing application module into a shareable feature module. We will then make an insignificant application module that has a dependency on the recently framed feature. Note that this feature module will be incorporated into the Instant App build targets later.

Convert the app module into a feature module called base-feature :-

We start with renaming the module from ‘app’ to ‘base-feature’:

Change Module Type :-

Next, we change the module Compose to Feature module by changing the plugin from com.android.application to com.android.feature and furthermore evacuate applicationId because this is no longer an application module in the base-feature/build.gradle file.

// replace apply plugin: ‘com.android.application’
// with
apply plugin: ‘com.android.feature’

// remove application id
applicationId “com.instantapp.demo”

Specify base feature in the project base-feature/build.gradle

android {
    ...
    baseFeature = true
    ...
}

Create appapk module to build APK file :-

Now that we have changed our source code into a reusable library module, we can make an insignificant application module that will make the APK. From File->New Module

Enter application name “app apk”, leave supported module name (instantappdemo)

Replace compile dependencies in appaapk/build.gradle :-

dependencies {
    implementation project(':base-feature')
}

Change it back to “Android view” and remove the application component from appaapk/src/main/AndroidManifest.xml. It should just contain this single manifest component.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.instantapp.demo">
</manifest>

We have just moved the application’s core usefulness into a shareable feature module and we are now prepared to start including the Instant App modules.

Creating the instant app APK :-

The Instant App module is simply a wrapper for all the feature modules in your task. It should not contain any code or resources.

Create an Instant App module :-

Select File -> New -> New Module

Next, we have to refresh the instant app gradle document to rely upon the base feature module.

instantapp/build.gradle

apply plugin: 'com.android.instantapp'

dependencies {
   implementation project(":base-feature")
}

The instant app does not hold any code or resources. It contains just a build.gradle file.

Now must complete a clean rebuild: Build – > Rebuild project.

Defining App Links :-

Select Tools > App Link Assistant

Now tap on the “Open URL Mapping Editor” button.

Now tap the “+” button.

Create a new URL mapping.
Host: http://yudiz.com
Path: pathPattern, /mainactivity
Activity: .MainActiviy (base-feature)

You have to do same process if you have multiple mapping.

Now select the Run configuration dropdown and choose “Edit Configurations…”

Now select instantapp under Android App.

Replace the text ‘<<ERROR–NO URL SET>>’ with https://yourdomain.com/mainactivity

For mapping on the website browser you have to go and Select Tools > App Link Assistant

Now tap on the “Open Digital Assets Links file Generator”.

Now enter your Site Domain and Application ID

Then select either Signing config or Select keystore file.

Now tap on the “Generate Digital Assets Links file” button.

Now you get the signing file details like above image and you have to upload this file on your domain as a suggested path : https://yourdomain.com/.well-known/assetlinks.json (Your Domain Server must be running with the https(SSL)).

After uploading that on the server you have to hit the “Link and Verify”button.

If you are doing something wrong for file uploading on server then it will give you the error like below image.

After Verifying successfully. Now select instantapp from the Run configuration dropdown and click Run.

You’re done.

Step 3 : Test

Now you can see in the below video that instant app doesn’t get installed and show in the application menu.