例子：下载apk然后安装

<provider
    android:name="android.support.v4.content.FileProvider"
 android:authorities="com.wj.autocoffeem.fileProvider"
    android:exported="false"
    android:grantUriPermissions="true" >

    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
 android:resource="@xml/provider_paths" />
</provider>

//provider_paths

<?xml version="1.0" encoding="utf-8"?>
<resources>
<paths>
    <!--360-->
    <!--<root-path path="" name="camera_photos" />-->
    <!--与`${RNFS.ExternalStorageDirectoryPath}/NewApp.apk`这个路劲匹配的-->

    <files-path path="" name="camera_photos" />
    <!--与`${RNFS.DocumentDirectoryPath}/NewApp.apk`这个路劲匹配的-->
</paths>
</resources>

下载路劲：const downloadDestPath = `${RNFS.DocumentDirectoryPath}/NewApp.apk`;

Android7.0文件访问权限