Allow launching inspector from dev menu

Reviewed By: davidaurelio

Differential Revision: D4095356

fbshipit-source-id: 46e43578cdcd663316efb82dffde27b77294c5c0

ReactAndroid/src/main/java/com/facebook/react/bridge/Inspector.java

@@ -19,6 +19,16 @@ public class Inspector {
 
   private final HybridData mHybridData;
 
+  public static boolean isSupported() {
+    try {
+      // This isn't a very nice way to do this but it works :|
+      instance().getPagesNative();
+      return true;
+    } catch (UnsatisfiedLinkError e) {
+      return false;
+    }
+  }
+
   public static List<Page> getPages() {
     try {
       return Arrays.asList(instance().getPagesNative());

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

@@ -162,6 +162,12 @@ public class DevServerHelper {
     }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
   }
 
+  public void openInspector(String id) {
+    if (mInspectorPackagerConnection != null) {
+      mInspectorPackagerConnection.sendOpenEvent(id);
+    }
+  }
+
   public void closeInspectorConnection() {
     new AsyncTask<Void, Void, Void>() {
       @Override

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

@@ -42,6 +42,7 @@ import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.R;
 import com.facebook.react.bridge.CatalystInstance;
 import com.facebook.react.bridge.DefaultNativeModuleCallExceptionHandler;
+import com.facebook.react.bridge.Inspector;
 import com.facebook.react.bridge.JavaJSExecutor;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.bridge.ReadableArray;
@@ -358,6 +359,19 @@ public class DevSupportManagerImpl implements DevSupportManager, PackagerCommand
             handleReloadJS();
           }
         });
+    if (Inspector.isSupported()) {
+      options.put(
+        "Debug JS on-device (experimental)", new DevOptionHandler() {
+          @Override
+          public void onOptionSelected() {
+            List<Inspector.Page> pages = Inspector.getPages();
+            if (pages.size() > 0) {
+              // TODO: We should get the actual page id instead of the first one.
+              mDevServerHelper.openInspector(String.valueOf(pages.get(0).getId()));
+            }
+          }
+        });
+    }
     options.put(
       mDevSettings.isReloadOnJSChangeEnabled()
         ? mApplicationContext.getString(R.string.catalyst_live_reload_off)

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

@@ -48,6 +48,15 @@ public class InspectorPackagerConnection {
     mConnection.close();
   }
 
+  public void sendOpenEvent(String pageId) {
+    try {
+      JSONObject payload = makePageIdPayload(pageId);
+      sendEvent("open", payload);
+    } catch (JSONException | IOException e) {
+      FLog.e(TAG, "Failed to open page", e);
+    }
+  }
+
   void handleProxyMessage(JSONObject message)
       throws JSONException, IOException {
     String event = message.getString("event");