使用 cordova-plugin-file 从 cordova (ionic) 中的 SD 卡读取文件作为数组

我在我的应用程序中使用需要作为缓冲区数组获取的音频文件。为此，我让用户选择一个文件（使用 Ionic/Cordova FileChooser 插件 https://ionicframework.com/docs/native/file-chooser/）然后我得到一个像这样的URL：

content://com.android.providers.media.documents/document/audio%3A8431

之后，我将此发送至科尔多瓦插件文件 https://github.com/apache/cordova-plugin-file resolveNativePath函数，我得到一个类似的路径：

file:///storage/emulated/0/Prueba interno/Interno, Teddybär, Dreh Dich Um__320kbps.mp3

在这里我做我的audioFileInfo Object

audioFileInfo = {name: "Interno, Teddybär, Dreh Dich Um__320kbps.mp3",
                 originalPath: "content://com.android.providers.media.documents/document/audio%3A8431",
                  path: "file:///storage/emulated/0/Prueba interno"}

最后我打电话filePlugin.readAsArrayBuffer(audioFileInfo.path, audioFileInfo.name)获取缓冲区数组。

当文件位于设备内部存储时，它可以正常工作，但是当文件来自 SDCard 时，它不起作用，因为readAsArrayBuffer返回“未找到”。

SD Card:

文件选择器 URL

content://com.android.externalstorage.documents/document/3D91-1C14%3AM%C3%BAsica%20Dana%2F1%20-%20Teddyb%C3%A4r%2C%20Teddyb%C3%A4r%2C%20Dreh%20Dich%20Um__320kbps.mp3

解析本地路径：

file:///sdcard/Música Dana/1 - Teddybär, Teddybär, Dreh Dich Um__320kbps.mp3

音频文件信息：

audioFileInfo = {
    name :"1 - Teddybär, Teddybär, Dreh Dich Um__320kbps.mp3"
    originalPath : "content://com.android.externalstorage.documents/document/3D91-1C14%3AM%C3%BAsica%20Dana%2F1%20-%20Teddyb%C3%A4r%2C%20Teddyb%C3%A4r%2C%20Dreh%20Dich%20Um__320kbps.mp3",
    path : "file:///sdcard/Música Dana"
}

读取为数组缓冲区：

FileError {code: 1, message: "NOT_FOUND_ERR"}

我已经尝试过 FilePlugins 的resolveLocalFilesystemUrl()我明白了Entry object:

{
    filesystem: {
        name: "content",
        root: {
            filesystem {
                name: "content",
                root: "...."
            }
        },

        fullPath: "/",
        isDirectory: true,
        isFile: false,
        name: "",
        nativeURL: "content://",
    },
    fullPath: "/com.android.externalstorage.documents/document/3D91-1C14:Música Dana/1 - Teddybär, Teddybär, Dreh Dich Um__320kbps.mp3",
    isDirectory: false,
    isFile: true,
    name: "1 - Teddybär, Teddybär, Dreh Dich Um__320kbps.mp3",
    nativeURL: "content://com.android.externalstorage.documents/document/3D91-1C14%3AM%C3%BAsica%20Dana%2F1%20-%20Teddyb%C3%A4r%2C%20Teddyb%C3%A4r%2C%20Dreh%20Dich%20Um__320kbps.mp3",
}

但是我不知道该用什么path在第一个参数中readAsArrayBuffer功能。

如果我使用fullPath and name它抛出编码错误。 如果我只得到没有名称的“路径”fullPath，它也会抛出编码错误.

有人有类似的经历吗？

我最终制作了自己的 FileReader 来处理带有返回信息的文件resolveLocalFilesystemUrl，请注意此代码使用 Typescript

    let entry = await this.filePlugin.resolveLocalFilesystemUrl(audioFileInfo.originalPath);
    let fileEntry: FileEntry = entry as FileEntry;
   
    console.log("fileEntry", fileEntry);
   
    let readFilePromise = new Promise < any > (resolve => {
        console.log("getting File from fileEntry");
        // fileEntry.getMetadata(data => {
        //     console.error("metadata", data); 
        // });
        fileEntry.file((file) => {
            console.log("File", file);
            var reader = new FileReader();
   
            reader.onloadend = () => {
                console.log("Successful file read: ", reader.result);
                resolve(reader.result);
            };
   
            reader.onprogress = (progressEvent) => {
   
                let fileUpdateInfo: FileLoadingUpdateInfo = {
                    audioFileInfo: audioFileInfo,
                    total: progressEvent.total,
                    loaded: progressEvent.loaded,
                    percent: parseFloat((progressEvent.loaded * 100 / progressEvent.total).toFixed(2))
                }
                this.updateAudioFileLoadingText$.next(fileUpdateInfo);
            };
            reader.onerror = (e) => {
                console.error("The reader had a problem", e)
                resolve(undefined);
            }
            reader.onabort = (e) => {
                console.error("We aborted...why???", e)
                resolve(undefined);
            }
            console.log("using reader to readAsArrayBuffer ");
            reader.readAsArrayBuffer(file);
   
   
        }, (e) => {
            console.error(e)
        });
    });
    let fileBufferArray = await readFilePromise;
    console.log("fileBufferArray", fileBufferArray);
   
    return fileBufferArray;