NativeScript DownloadManager

DownloadManager 是一个库，允许在 Android 上使用 Android Download Manager 从 Nativescript 下载文件。为什么不使用 Http.getFile() 呢？主要是因为在我看来，如果你要下载的文件不是 仅仅几KB，它几乎是完全损坏的。

安装

1. tns plugin add nativescript-downloadmanager

2. 请确保以下权限已在您的 android manifest 中

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

使用方法

使用方法非常直接：这是一个基于简化版默认 Hello world 应用程序的注释示例（即仅移除了点击计数功能并添加了下载方法）。

TLDR：检查下载方法。

import {Observable} from 'data/observable';
// Import the class.
import {DownloadManager} from 'nativescript-downloadmanager'

export class HelloWorldModel extends Observable {

    private _message: string;

    constructor() {
        super();
    }

    public download() {
    	// Instantiate a Download Manager. The way it's done (it uses a BroadcastReceiver), 
    	// it's mean to be kept alive during all the application lifetime. But we can kill unsubscribe 
        let dm = new DownloadManager();
        // We download a file, in this example a 10mb test file. 
        // This is the Most simple version of doing it.
        // Aside from that there are optional parameters for. Directory (always inside android/data/yourapp/),
        // The file name, and title and description for the notification bar. By default it uses the file name 
        // as title, and no description.
        dm.downloadFile("http://cachefly.cachefly.net/10mb.test", function(result,uri) {
            // result is a boolean, if the download was successful, it will return true
            console.log(result);
            // Uri in file:// format of the downloaded file.
            console.log(uri);
            // unregisterBroadcast is used to unregister the broadcast (For example if you just want to 
            // download a single file).
            dm.unregisterBroadcast();
        })
    }
}

待办事项

• 进行更多测试。
• 更好地记录文档。
• 制作某种 iOS 模拟版本。