Requesting overlay permission and isDebug

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationActivity.java

@@ -3,12 +3,56 @@ package com.reactnativenavigation.controllers;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
+import com.facebook.react.ReactNativeHost;
+import com.facebook.react.ReactPackage;
+import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
+import com.facebook.react.shell.MainReactPackage;
 import com.reactnativenavigation.R;
+import com.reactnativenavigation.react.NavigationPackage;
+import com.reactnativenavigation.react.ReactDevPermission;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class NavigationActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler {
+
+    private ReactNativeHost host;
 
-public class NavigationActivity extends AppCompatActivity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.splash);
+        host = new ReactNativeHost(getApplication()) {
+            @Override
+            protected boolean getUseDeveloperSupport() {
+                return NavigationApplication.instance.isDebug();
+            }
+
+            @Override
+            protected List<ReactPackage> getPackages() {
+                return Arrays.asList(
+                        new MainReactPackage(),
+                        new NavigationPackage()
+                );
+            }
+        };
+
+        if (ReactDevPermission.shouldAskPermission()) {
+            ReactDevPermission.askPermission(this);
+            return;
+        }
+
+        host.getReactInstanceManager().createReactContextInBackground();
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        host.getReactInstanceManager().onHostResume(this, this);
+    }
+
+    @Override
+    public void invokeDefaultOnBackPressed() {
+        onBackPressed();
     }
 }

android/app/src/main/java/com/reactnativenavigation/controllers/NavigationApplication.java

@@ -0,0 +1,15 @@
+package com.reactnativenavigation.controllers;
+
+import android.app.Application;
+
+public abstract class NavigationApplication extends Application {
+    public static NavigationApplication instance;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        instance = this;
+    }
+
+    public abstract boolean isDebug();
+}

android/app/src/main/java/com/reactnativenavigation/react/NavigationModule.java

@@ -0,0 +1,17 @@
+package com.reactnativenavigation.react;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+
+public class NavigationModule extends ReactContextBaseJavaModule {
+    public static final String NAME = "NavigationModule";
+
+    public NavigationModule(ReactApplicationContext reactContext) {
+        super(reactContext);
+    }
+
+    @Override
+    public String getName() {
+        return NAME;
+    }
+}

android/app/src/main/java/com/reactnativenavigation/react/NavigationPackage.java

@@ -0,0 +1,32 @@
+package com.reactnativenavigation.react;
+
+import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.JavaScriptModule;
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.ViewManager;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class NavigationPackage implements ReactPackage {
+
+    @Override
+    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
+        return Arrays.<NativeModule>asList(
+                new NavigationModule(reactContext)
+        );
+    }
+
+    @Override
+    public List<Class<? extends JavaScriptModule>> createJSModules() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
+        return Collections.emptyList();
+    }
+}
+

android/app/src/main/java/com/reactnativenavigation/react/ReactDevPermission.java

@@ -0,0 +1,36 @@
+package com.reactnativenavigation.react;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import android.provider.Settings;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.facebook.react.common.ReactConstants;
+import com.reactnativenavigation.controllers.NavigationApplication;
+
+public class ReactDevPermission {
+
+    public static boolean shouldAskPermission() {
+        return NavigationApplication.instance.isDebug() &&
+                Build.VERSION.SDK_INT >= 23 &&
+               !Settings.canDrawOverlays(NavigationApplication.instance);
+    }
+
+    @TargetApi(23)
+    public static void askPermission(Context context) {
+        if (shouldAskPermission()) {
+            Intent serviceIntent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
+            context.startActivity(serviceIntent);
+            String msg = "Overlay permissions needs to be granted in order for react native apps to run in dev mode";
+            Log.w(ReactConstants.TAG, "======================================\n\n");
+            Log.w(ReactConstants.TAG, msg);
+            Log.w(ReactConstants.TAG, "\n\n======================================");
+            for (int i = 0; i < 5; i++) {
+                Toast.makeText(context, msg, Toast.LENGTH_LONG).show();
+            }
+        }
+    }
+}

playground/android/app/src/main/java/com/reactnativenavigation/playground/MainApplication.java

@@ -1,7 +1,11 @@
 package com.reactnativenavigation.playground;
 
-import android.app.Application;
+import com.reactnativenavigation.controllers.NavigationApplication;
 
-public class MainApplication extends Application {
-    
+public class MainApplication extends NavigationApplication {
+
+    @Override
+    public boolean isDebug() {
+        return BuildConfig.DEBUG;
+    }
 }