【React Native】安卓系统保存图片到系统相册（实例+错误解决）

　　一、安装第三方库并引入

import CameraRoll from '@react-native-community/cameraroll';
import RNFS from 'react-native-fs';

　　　Github参考连接：CameraRoll  RNFS

　　二、添加权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

　　三、在引用组件中引入如下代码

　　不然会报"Error:Permission denied"错误，用来获取内存空间的读写权限。此处须要在顶部引入PermissionsAndroid

requestExternalStoragePermission = async () => {
        try {
            const granted = await PermissionsAndroid.request(
                PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
                {
                    title: 'My App Storage Permission',
                    message: 'My App needs access to your storage ' +
                        'so you can save your photos',
                },
            );
            return granted;
        } catch (err) {
            console.error('Failed to request permission ', err);
            return null;
        }
    };