Fix android backgrounding re-init issue

android/build.gradle

@@ -22,5 +22,5 @@ android {
 }
 
 dependencies {
-  compile 'com.facebook.react:react-native:+'
+  implementation 'com.facebook.react:react-native:+'
 }

android/src/main/java/com/staltz/react/workers/WorkersInstance.java

@@ -24,7 +24,6 @@
 import com.facebook.react.modules.systeminfo.AndroidInfoHelpers;
 import com.facebook.react.packagerconnection.PackagerConnectionSettings;
 import com.facebook.react.shell.MainReactPackage;
-import com.facebook.react.uimanager.UIImplementationProvider;
 import static com.facebook.infer.annotation.ThreadConfined.UI;
 
 import java.util.ArrayList;
@@ -164,11 +163,6 @@ protected List<ReactPackage> getPackages() {
         allPackages.add(0, new MainReactPackage());
         return allPackages;
       }
-
-      @Override
-      protected UIImplementationProvider getUIImplementationProvider() {
-        return null;
-      }
     };
   }
 

android/src/main/java/com/staltz/react/workers/WorkersInstanceManager.java

@@ -11,9 +11,11 @@
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
 import com.facebook.react.bridge.WritableMap;
+import com.facebook.react.module.annotations.ReactModule;
 
 import javax.annotation.Nullable;
 
+@ReactModule(name="WorkersInstanceManager")
 public class WorkersInstanceManager extends ReactContextBaseJavaModule {
 
   private final ReactContext context;

android/src/main/java/com/staltz/react/workers/WorkersManager.java

@@ -13,25 +13,32 @@
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
-import com.facebook.react.modules.systeminfo.AndroidInfoHelpers;
+import com.facebook.react.module.annotations.ReactModule;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
 import javax.annotation.Nullable;
 
+@ReactModule(name = "WorkersManager")
 public class WorkersManager extends ReactContextBaseJavaModule {
 
   private final ReactApplicationContext context;
   private final ReactPackage packages[];
+  private Integer key;
+  private String bundleRoot;
+  private String bundleResource;
+  private Integer bundlerPort;
+  private Promise promise;
 
   private final HashMap<Integer, WorkersInstance> workers = new HashMap<>();
   private final List<Integer> bundlerPorts = new ArrayList<>();
 
+
   public WorkersManager(
-    final ReactApplicationContext context,
-    final ReactPackage packages[]
+          final ReactApplicationContext context,
+          final ReactPackage packages[]
   ) {
     super(context);
     this.context = context;
@@ -49,24 +56,30 @@ public String getName() {
 
   @ReactMethod
   public void startWorker(
-    final Integer key,
-    final String bundleRoot,
-    final String bundleResource,
-    final Integer bundlerPort,
-    final Promise promise
+          final Integer key,
+          final String bundleRoot,
+          final String bundleResource,
+          final Integer bundlerPort,
+          final Promise promise
   ) {
     Assertions.assertCondition(!this.workers.containsKey(key), "Key already in use");
 
+    this.key = key;
+    this.bundleRoot = bundleRoot;
+    this.bundleResource = bundleResource;
+    this.bundlerPort = bundlerPort;
+    this.promise = promise;
+
     final boolean hasBundlerPort = this.allocateBundlerPort(bundlerPort);
 
     final WorkersInstance worker = new WorkersInstance(
-      key,
-      context,
-      this.packages,
-      bundleRoot,
-      bundleResource,
-      hasBundlerPort ? bundlerPort : null,
-      promise
+            key,
+            context,
+            this.packages,
+            bundleRoot,
+            bundleResource,
+            hasBundlerPort ? bundlerPort : null,
+            promise
     );
 
     this.workers.put(key, worker);
@@ -81,20 +94,16 @@ public void run() {
 
   @ReactMethod
   public void stopWorker(final Integer key) {
-    final WorkersInstance worker = this.workers.remove(key);
-    Assertions.assertNotNull(worker);
-
-    new Handler(Looper.getMainLooper()).post(new Runnable() {
-      @Override
-      public void run() {
-        worker.stop();
-      }
-    });
+    this.workers.remove(key);
   }
 
   @ReactMethod
   public void postMessage(final Integer key, final String message) {
-    final WorkersInstance worker = this.workers.get(key);
+    WorkersInstance worker = this.workers.get(key);
+    if (worker == null) {
+      startWorker(this.key, this.bundleRoot, this.bundleResource, this.bundlerPort, this.promise);
+      worker = this.workers.get(key);
+    }
     Assertions.assertNotNull(worker).postMessage(message);
   }
 
@@ -108,8 +117,8 @@ private interface RCTDeviceEventEmitter extends JavaScriptModule {
 
   protected void emit(final String name, final Object body) {
     this.context
-      .getJSModule(WorkersManager.RCTDeviceEventEmitter.class)
-      .emit(name, body);
+            .getJSModule(WorkersManager.RCTDeviceEventEmitter.class)
+            .emit(name, body);
   }
 
   /**

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-workers",
-  "version": "0.6.0",
+  "version": "0.6.6-gl-007",
   "description": "React Native web workers",
   "author": "Garrett Mitchell",
   "license": "MIT",