android: fixed e2e

playground/android/app/src/androidTest/AndroidManifest.xml

     package="com.reactnativenavigation.playground">
 
     <uses-sdk
-        android:minSdkVersion="18"
+        android:minSdkVersion="23"
         tools:overrideLibrary="android.support.test.uiautomator.v18" />
 
 </manifest>

playground/android/app/src/androidTest/java/com/reactnativenavigation/playground/ApplicationLifecycleTest.java

 package com.reactnativenavigation.playground;
 
+import android.provider.Settings;
+import android.support.annotation.RequiresApi;
 import android.support.test.espresso.Espresso;
 import android.support.test.espresso.IdlingResource;
+import android.support.test.filters.SdkSuppress;
 import android.support.test.rule.ActivityTestRule;
 import android.support.test.runner.AndroidJUnit4;
 import android.support.test.uiautomator.UiDevice;
-import android.support.test.uiautomator.UiObjectNotFoundException;
 import android.support.test.uiautomator.UiSelector;
 
 import com.facebook.react.ReactNativeHost;
 import com.reactnativenavigation.controllers.NavigationActivity;
 
-import org.junit.FixMethodOrder;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.junit.runners.MethodSorters;
-
-import java.io.IOException;
 
 import static android.support.test.InstrumentationRegistry.getInstrumentation;
 import static android.support.test.espresso.Espresso.onView;
 import static android.support.test.espresso.assertion.ViewAssertions.matches;
 import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
 import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import static org.junit.Assume.assumeFalse;
+import static org.junit.Assume.assumeTrue;
 
 @RunWith(AndroidJUnit4.class)
-@FixMethodOrder(value = MethodSorters.NAME_ASCENDING)
+@SdkSuppress(minSdkVersion = 23)
+@RequiresApi(api = 23)
 public class ApplicationLifecycleTest {
 
     @Rule
-    public ActivityTestRule<MainActivity> rule = new ActivityTestRule<>(MainActivity.class, false, false);
+    public ActivityTestRule<MainActivity> rule = new ActivityTestRule<MainActivity>(MainActivity.class, false, false) {
+        @Override
+        protected void afterActivityLaunched() {
+            super.afterActivityLaunched();
+            registerIdlingResource(rule.getActivity());
+        }
+    };
 
-    private void registerIdlingResource() {
+    private void registerIdlingResource(final NavigationActivity activity) {
         Espresso.registerIdlingResources(new IdlingResource() {
             @Override
             public String getName() {
 
             @Override
             public boolean isIdleNow() {
-                ReactNativeHost host = NavigationActivity.instance.getHost();
+                ReactNativeHost host = activity.getHost();
                 return host != null
                         && host.hasInstance()
                         && host.getReactInstanceManager().hasStartedCreatingInitialContext()
         });
     }
 
-    @Test
-    public void startApp_LoadsBridge_ThenShowsWelcomeScreen() throws UiObjectNotFoundException, IOException {
+    private void launchActivity() {
         rule.launchActivity(null);
+    }
 
+    private void acceptPermission() throws Exception {
         UiDevice.getInstance(getInstrumentation()).findObject(new UiSelector().text("Playground")).click();
         UiDevice.getInstance(getInstrumentation()).findObject(new UiSelector().text("Permit drawing over other apps")).click();
         UiDevice.getInstance(getInstrumentation()).pressBack();
         UiDevice.getInstance(getInstrumentation()).pressBack();
+    }
 
-        registerIdlingResource();
 
+    @Test
+    public void startApp_HandleOverlayPermissions_LoadsBridge_ThenShowsWelcomeScreen() throws Exception {
+        assumeFalse(Settings.canDrawOverlays(getInstrumentation().getContext()));
+        launchActivity();
+        acceptPermission();
+        onView(withText("React Native Navigation!")).check(matches(isDisplayed()));
+    }
+
+    @Test
+    public void startApp_NoPermissionRequired_ShowsWelcomeScreen() {
+        assumeTrue(Settings.canDrawOverlays(getInstrumentation().getContext()));
+        launchActivity();
         onView(withText("React Native Navigation!")).check(matches(isDisplayed()));
     }
 }