th:auto!important; min-height:auto!important; background:none!important'>*

获取 Application中 ReactNativeHost

*

@return

*/

private

ReactNativeHost getReactNativeHost() {

return

MainApplication.getInstance().getReactNativeHost();

}

/**

*

获取 ReactInstanceManager

*

@return

*/

private

ReactInstanceManager getReactInstanceManager() {

return

getReactNativeHost().getReactInstanceManager();

}

代码很长，重点在onCreate方法：

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if
(mMainComponentName != null
&& !needsOverlayPermission) {
           //
1.从缓存中获取RootView
           mReactRootView
= ReactNativePreLoader.getReactRootView(mMainComponentName);

           if(mReactRootView
== null)
{

               //
2.缓存中不存在RootView,直接创建
               mReactRootView
= new
ReactRootView(mActivity);
               mReactRootView.startReactApplication(
                       getReactInstanceManager(),
                       mMainComponentName,
                       null);
           }
           //
3.将RootView设置到Activity布局
           mActivity.setContentView(mReactRootView);