[移动开发][RN] 实现下载

https://juejin.cn/post/6925818114974154765

React Hook 中 createContext & useContext 跨组件透传上下文与性能优化

注意:

从 Android 6.0（API 级别 23）开始，用户在应用运行时授予应用权限，而不是在安装应用时授予权限。因此添加权限AndroidManifest.xml不适用于 Android 6.0+ 设备。要在运行时授予权限，您可以使用PermissionAndroid API。

if (Platform.OS === 'android') {
    requestStorePermission();
} 
......
const requestStorePermission = async () => {
    const granted = await PermissionsAndroid.request(
        PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
        {
            title: 'Storage',
            message: 'This app would like to store some files on your phone',
            // buttonNeutral: "message..",
            // buttonNegative: "No",
            buttonPositive: "Yes"
        }
    );
    if (granted === PermissionsAndroid.RESULTS.GRANTED) { // 已授权
		......
    }
}