Updates in your app: Support in-app updates

Google has added support for in-app updates, this is a new feature introduced in Play Core Library 1.5.0 (as of now is in 1.9.0).

Here is how can be implemented summarily and now we will see a very minimal practical example of Immediate update.

public static void checkUpdates(AppCompatActivity ctx) {
AppUpdateManager appUpdateManager = AppUpdateManagerFactory.create(ctx);
        Task<AppUpdateInfo> appUpdateInfoTask = appUpdateManager.getAppUpdateInfo();

        appUpdateInfoTask.addOnSuccessListener(appUpdateInfo -> {
            if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE && appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.IMMEDIATE)) {
                // Request the update.
                try {
                    appUpdateManager.startUpdateFlowForResult(
                            // Pass the intent that is returned by 'getAppUpdateInfo()'.
                            appUpdateInfo,
                            AppUpdateType.IMMEDIATE,
                            // The current activity making the update request.
                            ctx,
                            // Include a request code to later monitor this update request.
                            MY_REQUEST_CODE);
                    appUpdateManager.registerListener(state -> {
                        if (state.installStatus() == InstallStatus.DOWNLOADED)
                            appUpdateManager.completeUpdate();
                    });
                } catch (IntentSender.SendIntentException e) {
                    Log.e("myapp", "checkUpdates: Error in the update intent: ", e);
                }
            }
        });
        appUpdateInfoTask.addOnFailureListener(e -> Log.e("myapp", "checkUpdates 2: Error in the update intent:", e));
}

This will launch a full-screen window intent with a Google-Play-style app update

You can add the call to this static method any time in you app, I recommend to put it in a splash screen o during the loading of the main activity.