Merge pull request gre#155 from gevorg94/background_color

[android] Set transparent background.

Author: gre

android/src/main/java/com/projectseptember/RNGL/GLCanvasManager.java

@@ -52,6 +52,16 @@ public void setZOrderMediaOverlay(GLCanvas view, boolean overlay) {
         view.setZOrderMediaOverlay(overlay);
     }
 
+    @ReactProp(name = "setZOrderOnTop")
+    public void setZOrderOnTop (GLCanvas view, boolean setZOrderOnTop) {
+        view.setZOrderOnTop(setZOrderOnTop);
+    }
+
+    @ReactProp(name = "backgroundColor")
+    public void setBackgroundColor (GLCanvas view, Integer color) {
+        view.setBackgroundColor(color);
+    }
+
     @ReactProp(name = "pointerEvents")
     public void setPointerEvents(GLCanvas view, @Nullable String pointerEventsStr) {
         if (pointerEventsStr != null) {

src/GLCanvas.js

@@ -1,6 +1,6 @@
 import invariant from "invariant";
 import React, {Component} from "react";
-  import {requireNativeComponent, findNodeHandle} from "react-native";
+import {requireNativeComponent, findNodeHandle, processColor} from "react-native";
 import captureFrame from "./GLCanvas.captureFrame";
 
 const serializeOption = config =>
@@ -114,13 +114,15 @@ class GLCanvas extends Component {
 
   render () {
     const {
-      width, height,
+      width, height, style,
       onLoad, onProgress, eventsThrough,
       ...restProps } = this.props;
+    const { backgroundColor } = style;
 
     return <GLCanvasNative
       ref="native"
       {...restProps}
+      backgroundColor={processColor(backgroundColor)}
       style={{ width, height }}
       onGLLoad={onLoad ? onLoad : null}
       onGLProgress={onProgress ? onProgress : null}