我需要从使用 rncamera roll 应用程序创建的自定义文件夹中获取文件,我使用react-native-fs 来访问该文件夹,但无法获取文件,即使我正确指定了文件夹名称,但我得到了可能的未处理的承诺拒绝(id:7):错误:文件夹不存在。我怎样才能访问这个文件夹?
即使我删除了文件夹名称 RNFS.readDir(RNFS.ExternalStorageDirectoryPath) 来检查我的 console.log 结果,我也收到错误“isFile 不是函数”。
这段代码有什么问题以及如何纠正它们。
UNSAFE_componentWillMount() {
RNFS.readDir(RNFS.ExternalStorageDirectoryPath+"myApp Videos")
.then((result) => {
console.log('GOT RESULT', result);
return Promise.all([RNFS.stat(result[0].path), result[0].path]);
})
.then((statResult) => {
let videos = []
var allowedExtensions = /(\.avi|\.mp4|\.mov|\.wmv|\.avi)$/i;
statResult.forEach(item => {
if (item.isFile() && !allowedExtensions.exec(item.originalFilepath)) {
videos.push(item)
}
});
console.log(videos)
})
}
setIndex = (index) => {
if (index === this.state.index) {
index = null
}
this.setState({ index })
}
render() {
return (
<View style={styles.container}>
<ScrollView
contentContainerStyle = {styles.scrollview}
{
...this.state.videos && this.state.videos.length > 0 && this.state.videos.map((p, i) => {
const isSelected = i === this.state.index;
const divide = isSelected && this.share === true ? 1 : 3;
return(
<Video
source={{uri: videos}}
style={{opacity: i === this.state.index ? 0.5 : 1, width: width/divide, height: width/divide}}
key={i}
underlayColor='transparent'
onPress={() => this.setIndex(i)}
ref={ref => {
this.player = ref;
}} // Store reference
onError={this.videoError} // Callback when video cannot be loaded
/>
)
})
}
>
</ScrollView>
</View>
);
}
我找到了解决此类问题的解决方案,通过保证访问并在代码中添加控件,使用 React Native 和 RNFS => 访问私有文件和目录,如下所示:
这里是如何将数据库文件从 db 文件夹复制到ExternalStorageDirectory 的示例
var path_dbMaster="/data/user/0/com.<name_your_package>/databases/db_name"
var path_dbCopie=RNFS.ExternalStorageDirectoryPath+'/dbCopie.db'
const granted = await PermissionsAndroid.request(PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE, );
if (granted === PermissionsAndroid.RESULTS.GRANTED)
{
RNFS.copyFile(path_dbMaster,path_dbCopie)
.then(result => {
console.log('file copied:', result);
})
.catch(err => {
console.log(err);
});
// or any treatment you have to do
}
else {
console.log('not granted');
Alert.alert(''," Permission required ",[{
text:'OK',
style:'cancel'
}])
}