Add a debug support to load js bundle from external URL

Summary: Code refactoring on the dev support class. The idea is to make the code more modular.

Reviewed By: mhorowitz

Differential Revision: D4164676

fbshipit-source-id: 0d29bdaf927cd0e9f399fe6f8e46a16dfa65fb69

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java

@@ -222,16 +222,19 @@ public class DevServerHelper {
     return String.format(Locale.US, RESOURCE_URL_FORMAT, host, resourcePath);
   }
 
+  public String getDevServerBundleURL(final String jsModulePath) {
+    return createBundleURL(
+      getDebugServerHost(),
+      jsModulePath,
+      getDevMode(),
+      getHMR(),
+      getJSMinifyMode());
+  }
+
   public void downloadBundleFromURL(
       final BundleDownloadCallback callback,
-      final String jsModulePath,
+      final File outputFile,
-      final File outputFile) {
+      final String bundleURL) {
-    final String bundleURL = createBundleURL(
-        getDebugServerHost(),
-        jsModulePath,
-        getDevMode(),
-        getHMR(),
-        getJSMinifyMode());
     final Request request = new Request.Builder()
         .url(bundleURL)
         .build();

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManager.java

@@ -45,6 +45,7 @@ public interface DevSupportManager extends NativeModuleCallExceptionHandler {
   boolean hasUpToDateJSBundleInCache();
   void reloadSettings();
   void handleReloadJS();
+  void reloadJSFromServer(final String bundleURL);
   void isPackagerRunning(DevServerHelper.PackagerStatusCallback callback);
   @Nullable File downloadBundleResourceFromUrlSync(
       final String resourceURL,

ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerImpl.java

@@ -635,18 +635,12 @@ public class DevSupportManagerImpl implements DevSupportManager, PackagerCommand
       mRedBoxDialog.dismiss();
     }
 
-    AlertDialog dialog = new AlertDialog.Builder(mApplicationContext)
-      .setTitle(R.string.catalyst_jsload_title)
-      .setMessage(mApplicationContext.getString(
-          mDevSettings.isRemoteJSDebugEnabled() ? R.string.catalyst_remotedbg_message : R.string.catalyst_jsload_message))
-      .create();
-    dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
-    dialog.show();
-
     if (mDevSettings.isRemoteJSDebugEnabled()) {
-      reloadJSInProxyMode(dialog);
+      reloadJSInProxyMode(showProgressDialog());
     } else {
-      reloadJSFromServer(dialog);
+      String bundleURL =
+        mDevServerHelper.getDevServerBundleURL(Assertions.assertNotNull(mJSAppBundleName));
+      reloadJSFromServer(bundleURL);
     }
   }
 
@@ -741,7 +735,22 @@ public class DevSupportManagerImpl implements DevSupportManager, PackagerCommand
     };
   }
 
-  private void reloadJSFromServer(final AlertDialog progressDialog) {
+  private AlertDialog showProgressDialog() {
+    AlertDialog dialog = new AlertDialog.Builder(mApplicationContext)
+      .setTitle(R.string.catalyst_jsload_title)
+      .setMessage(mApplicationContext.getString(
+          mDevSettings.isRemoteJSDebugEnabled() ?
+          R.string.catalyst_remotedbg_message :
+          R.string.catalyst_jsload_message))
+      .create();
+    dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
+    dialog.show();
+    return dialog;
+  }
+
+  public void reloadJSFromServer(final String bundleURL) {
+    final AlertDialog progressDialog = showProgressDialog();
+
     mDevServerHelper.downloadBundleFromURL(
         new DevServerHelper.BundleDownloadCallback() {
           @Override
@@ -776,8 +785,8 @@ public class DevSupportManagerImpl implements DevSupportManager, PackagerCommand
                 });
           }
         },
-        Assertions.assertNotNull(mJSAppBundleName),
+        mJSBundleTempFile,
-        mJSBundleTempFile);
+        bundleURL);
     progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
       @Override
       public void onCancel(DialogInterface dialog) {

ReactAndroid/src/main/java/com/facebook/react/devsupport/DisabledDevSupportManager.java

@@ -126,6 +126,11 @@ public class DisabledDevSupportManager implements DevSupportManager {
 
   }
 
+  @Override
+  public void reloadJSFromServer(String bundleURL) {
+
+  }
+
   @Override
   public void isPackagerRunning(DevServerHelper.PackagerStatusCallback callback) {