forward ThemedReactContext#has/getCurrentActivity calls to wrapped co…

…ntext

Summary:
`ThemedReactContext` wraps the actual `ReactContext` but doesn't actually receive any lifecycle events, which would set `mCurrentActivity`, so that's always stuck as `null`. To fix, we override `has/getCurrentActivity` and forward the call to the wrapped context, which actually has the correct lifecycle status.

Fixes issue facebook#9310 on github.

Reviewed By: mkonicek

Differential Revision: D3703005

fbshipit-source-id: 363e87ac91d50516899b413e823d5312cbb807f4

ReactAndroid/src/main/java/com/facebook/react/uimanager/ThemedReactContext.java

@@ -9,10 +9,10 @@
 
 package com.facebook.react.uimanager;
 
+import javax.annotation.Nullable;
+
+import android.app.Activity;
 import android.content.Context;
-import android.content.Intent;
-import android.content.res.Resources;
-import android.os.Bundle;
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContext;
@@ -47,4 +47,14 @@ public void addLifecycleEventListener(LifecycleEventListener listener) {
   public void removeLifecycleEventListener(LifecycleEventListener listener) {
     mReactApplicationContext.removeLifecycleEventListener(listener);
   }
+
+  @Override
+  public boolean hasCurrentActivity() {
+    return mReactApplicationContext.hasCurrentActivity();
+  }
+
+  @Override
+  public @Nullable Activity getCurrentActivity() {
+    return mReactApplicationContext.getCurrentActivity();
+  }
 }