Cordova 使用angular2-ionic 2下载文件

我有一个Ionic 2应用程序，我需要从soundcloud下载音频。我已经有了执行请求所需的url：

let url = `https://api.soundcloud.com/tracks/${audio.id}/download?client_id=${this.SC_CLIENT_ID}`

我想知道怎么做。我尝试了文件传输：

public download(audio: any): void {

        this.platform.ready().then(() => {
            console.log("Clickeo para descargar: " + audio.id);

            let url = `https://api.soundcloud.com/tracks/${audio.id}/download?client_id=${this.SC_CLIENT_ID}`;

            let pathToSaveTo: string = '';

            if (this.platform.is('android')) {
                pathToSaveTo = cordova.file.externalApplicationStorageDirectory + audio.id + '.wav';

                let fileTransfer = new Transfer();

                fileTransfer.onProgress(this.onProgress);

                fileTransfer.download(url, pathToSaveTo)
                    .then((entry) => {
                        console.log('download complete: ' + entry.toURL());
                    }, (error) => {

                        let prompt = this.alertCtrl.create({
                            title: 'Error',
                            subTitle: error,
                            buttons: ['Accept']
                        });

                        prompt.present();
                    });
            }
        });

    }

    onProgress = (progressEvent: ProgressEvent) : void => {
        this.ngZone.run(() => {
            if (progressEvent.lengthComputable) {
                let progress: any = Math.round((progressEvent.loaded / progressEvent.total) * 100);
                console.log(progress);
                let toast = this.toastCtrl.create({
                  message: progress,
                  duration: 100
                });
                toast.present();
            }
        });
    }

但它总是下载一个零KB的文件。有解决办法吗？也许是安格拉2路，还是我做错了？ 若我将这个url放在浏览器中，使用正确的音频id和mi客户端id，它将开始下载，但不会使用文件传输

谢谢你，这是事先准备好的

---

Ivan。

我的问题是soundcloud返回了带有重定向的响应。我必须检测重定向状态并手动重定向到

response.headers.Location

这就是工作代码：

public download(localAudio: LocalAudio): void {
    let fileName: string = localAudio.id + '.mp3';

    var audio: StorageAudio = {
        localAudio: localAudio,
        url: `https://api.soundcloud.com/tracks/${localAudio.id}/download?client_id=${this.SC_CLIENT_ID}`,
        fileName: fileName,
        filePath: this.file.dataDirectory + fileName
    };

    if (this.platform.is('ios')) {
        audio.filePath = audio.filePath.replace(/^file:\/\//, '');
    }

    this.toastNotifications.showStartingDownloadMsg();

    this.http.downloadFile(audio.url, {}, {}, audio.filePath).then(response => {
        this.toastNotifications.showDownloadCompleteMsg();

        this.storeAudioInformation(audio);
    }).catch(response => {
        /**
         * Handle redirects if exist.
         */
        if (this.hasRedirection(response)) {
            console.log("Redirect to " + response.headers.Location);
            audio.url = response.headers.Location;

            this.redirectToDownload(audio);
        } else {
            this.toastNotifications.showDownloadErrorMsg();
        }
    });
}

public hasRedirection(response: any): boolean {
    return (response.headers.Location && (response.status === 301 || response.status === 302));
}

public redirectToDownload(audio: StorageAudio): void {
    this.http.downloadFile(audio.url, {}, {}, audio.filePath).then(response => {
        this.toastNotifications.showDownloadCompleteMsg();

        this.storeAudioInformation(audio);
    }).catch(response => {
        console.log("Error catch: " + JSON.stringify(response));
    });
}

---

我的问题是soundcloud返回了带有重定向的响应。我必须检测重定向状态并手动重定向到

response.headers.Location

这就是工作代码：

public download(localAudio: LocalAudio): void {
    let fileName: string = localAudio.id + '.mp3';

    var audio: StorageAudio = {
        localAudio: localAudio,
        url: `https://api.soundcloud.com/tracks/${localAudio.id}/download?client_id=${this.SC_CLIENT_ID}`,
        fileName: fileName,
        filePath: this.file.dataDirectory + fileName
    };

    if (this.platform.is('ios')) {
        audio.filePath = audio.filePath.replace(/^file:\/\//, '');
    }

    this.toastNotifications.showStartingDownloadMsg();

    this.http.downloadFile(audio.url, {}, {}, audio.filePath).then(response => {
        this.toastNotifications.showDownloadCompleteMsg();

        this.storeAudioInformation(audio);
    }).catch(response => {
        /**
         * Handle redirects if exist.
         */
        if (this.hasRedirection(response)) {
            console.log("Redirect to " + response.headers.Location);
            audio.url = response.headers.Location;

            this.redirectToDownload(audio);
        } else {
            this.toastNotifications.showDownloadErrorMsg();
        }
    });
}

public hasRedirection(response: any): boolean {
    return (response.headers.Location && (response.status === 301 || response.status === 302));
}

public redirectToDownload(audio: StorageAudio): void {
    this.http.downloadFile(audio.url, {}, {}, audio.filePath).then(response => {
        this.toastNotifications.showDownloadCompleteMsg();

        this.storeAudioInformation(audio);
    }).catch(response => {
        console.log("Error catch: " + JSON.stringify(response));
    });
}

---

参考这个：在MELWINVINCENT为你工作，但这不是我的问题。我的问题是soundcloud返回了带有重定向的响应。我必须检测重定向状态并手动重定向到

响应.headers.Location

参考以下内容：在MELWINVINCENT为我工作，但这不是我的问题。我的问题是soundcloud返回了带有重定向的响应。我必须检测重定向状态并手动重定向到

response.headers.Location

我还试图在Ionic应用程序中使用soundcloud url下载。当我尝试使用您的解决方案时，我得到了response.headers.Location=未定义，因此我无法下载。你对此有什么想法吗？我也在尝试在爱奥尼亚应用程序中使用SoundCloudURL下载。当我尝试使用您的解决方案时，我得到了response.headers.Location=未定义，因此我无法下载。你知道这件事吗？