npace

...
android {
    ...
    // Override the android:testOnly="true" attribute that the new build tools set so that debug APKs can be installed normally
    applicationVariants.all { variant ->
        variant.outputs.all { output ->
            output.processManifest.doLast {
                String manifestPath = "$manifestOutputDirectory/AndroidManifest.xml"
                def manifestContent = file(manifestPath).getText()
                manifestContent = manifestContent.replace('android:testOnly="true"', 'android:testOnly="false"')

npace

// package declaration, imports...

public class ForegroundLifecycleCallback implements Application.ActivityLifecycleCallbacks {
    private int startedActivitiesCount = 0;

    @Override
    public void onActivityStarted(Activity activity) {
        if (startedActivitiesCount == 0) {
            // your foreground stuff
        }