*react-native 原生将Activity转换成rn的view
在有些开发场景中有将activity转换成view的场景，我这边是用阿里百川碰到的，因为有些操作必须在activity操作所以需要在次转换成view
1、定义全局LocalActivityManager变量

LocalActivityManager mLocalActivityManager;

oncreate()方法实例化mLocalActivityManager = new LocalActivityManager((Activity) context, true);

2、在oncreate,onresume,onpause方法中分别加入如下代码：

oncreate()--------------mLocalActivityManager.dispatchCreate(arg0);参数arg0为oncreate方法的形参

onpause()--------------mLocalActivityManager.dispatchPause(isFinishing());

onresume()--------------mLocalActivityManager.dispatchResume();

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原文链接：https://blog.csdn.net/xingshen58/article/details/13503701

    public View activityToView(ThemedReactContext parent, Intent intent) {
        final Window w = MainActivity.mLocalActivityManager.startActivity("id", intent);
        final View wd = w != null ? w.getDecorView() : null;
        if (wd != null) {
            wd.setVisibility(View.VISIBLE);
            wd.setFocusableInTouchMode(true);
            ((ViewGroup) wd)
                    .setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
        }
        return wd;
    }