Android JS services

Author: devfd

android/src/main/java/co/apptailor/Worker/JSService.java

@@ -0,0 +1,101 @@
+package co.apptailor.Worker;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Looper;
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.common.ApplicationHolder;
+import com.facebook.react.devsupport.DevInternalSettings;
+import com.facebook.react.devsupport.DevServerHelper;
+import com.facebook.soloader.SoLoader;
+
+import java.io.File;
+
+import co.apptailor.Worker.core.StubDevSupportManager;
+
+public class JSService extends Service {
+    private static final String TAG = "JSService";
+    private JSWorker worker;
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        SoLoader.init(this, /* native exopackage */ false);
+        try {
+            ApplicationHolder.getApplication();
+        }
+        catch (AssertionError err) {
+            ApplicationHolder.setApplication(getApplication());
+        }
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        clean();
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Log.d(TAG, "Starting background JS Service");
+
+        DevInternalSettings devInternalSettings = new DevInternalSettings(this, new StubDevSupportManager());
+        devInternalSettings.setHotModuleReplacementEnabled(false);
+        devInternalSettings.setElementInspectorEnabled(false);
+        devInternalSettings.setReloadOnJSChangeEnabled(false);
+
+        DevServerHelper devServerHelper = new DevServerHelper(devInternalSettings);
+
+        String bundleName = "src/service.bundle";
+        String bundleSlug = bundleName.replaceAll("/", "_");
+
+        final File bundleFile = new File(this.getFilesDir(), bundleSlug);
+        worker = new JSWorker(bundleName, devServerHelper.getSourceUrl(bundleName), bundleFile.getAbsolutePath());
+
+        final Handler mainHandler = new Handler(Looper.getMainLooper());
+        final ReactApplicationContext context = new ReactApplicationContext(getApplicationContext());
+
+        devServerHelper.downloadBundleFromURL(new DevServerHelper.BundleDownloadCallback() {
+            @Override
+            public void onSuccess() {
+                mainHandler.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        try {
+                            worker.runFromContext(context);
+                        } catch (Exception e) {
+                            Log.d(TAG, "Error while running service bundle");
+                            e.printStackTrace();
+                        }
+                    }
+                });
+            }
+
+            @Override
+            public void onFailure(Exception cause) {
+                Log.d(TAG, "Error while downloading service bundle");
+                cause.printStackTrace();
+            }
+        }, bundleName, bundleFile);
+
+        return Service.START_STICKY;
+    }
+
+    private void clean() {
+        if (worker != null) {
+            worker.terminate();
+            worker = null;
+        }
+    }
+}

android/src/main/java/co/apptailor/Worker/WorkerModule.java

@@ -1,6 +1,7 @@
 package co.apptailor.Worker;
 
 import android.app.Activity;
+import android.content.Intent;
 import android.os.Handler;
 import android.util.Log;
 
@@ -116,6 +117,14 @@ public void postWorkerMessage(int workerId, String message) {
         worker.postMessage(message);
     }
 
+    @ReactMethod
+    public void startService() {
+        Activity activity = getCurrentActivity();
+        if (activity == null) { return; }
+        Intent intent = new Intent(activity, JSService.class);
+        activity.startService(intent);
+    }
+
     @Override
     public void onHostResume() {}