android的download manager(1)

android 2.3中引入了Download manager。作为一个service来优化长时间下载操作的处理。Download Manager通过处理HTTP链接、监控链接的变化和系统又一次启动来确保每一次下载都能成功。

下载文件;

	public void funclick(View view){
		String serviceString = Context.DOWNLOAD_SERVICE;
		DownloadManager downloadManager;
		downloadManager = (DownloadManager)getSystemService(serviceString);
		
		Uri uri = Uri.parse("http://img00.hc360.com/it/201206/201206121034589404.jpg");
		DownloadManager.Request request = new Request(uri);
		long reference = downloadManager.enqueue(request);
	}

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

假设要限制为WIFI下载呢，能够这样：

request.setAllowedNetworkTypes(Request.NETWORK_WIFI);

downloadManager.getRecommendedMaxBytesOverMobile(getApplicationContext());