Android - DownloadManager的使用

DownloadUtil downloadUtil = new DownloadUtil(context);
downloadUtil.download();

package me.chunyu.model.utils;

import android.annotation.TargetApi;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.webkit.MimeTypeMap;

/**
* 下载类, 默认下载春雨医生APK, 也可以下载其他APK.
* 存储位置: /sdcard/download/filename
* <p/>
* Created by C.L.Wang on 15/7/27.
*/
@TargetApi(11)
public class DownloadUtil {

private static final String CHUNYU_DOWNLOAD_URL =
"http://www.chunyuyisheng.com/download/chunyu/latest/";

private static final String APK_TYPE =
"application/vnd.android.package-archive";

private static final String DEFAULT_FILE_NAME = "chunyudoctor.apk";

private static final String DEFAULT_TITLE = "春雨医生";

private Context mContext; // 下载进行
private String mUrl; // URL地址
private String mFileName; // 文件名
private String mTitle; // 通知栏标题

private DownloadManager mDownloadManager; // 下载管理器
private long mDownloadId; // 下载ID

// 下载完成的接收器
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
if (downloadId == mDownloadId) {
installApp(mDownloadId);
destroyArgs();
}
}
};

/**
* 默认构造器, 下载春雨医生APK
*
* @param context 上下文
*/
public DownloadUtil(Context context) {
this(context, CHUNYU_DOWNLOAD_URL, DEFAULT_FILE_NAME, DEFAULT_TITLE);
}

/**
* 参数构造器, 下载其他文件
*
* @param context  活动
* @param url      URL
* @param fileName 存储文件名
* @param title    通知栏标题
*/
public DownloadUtil(Context context, String url, String fileName, String title) {
mContext = context;
mUrl = url;
mFileName = fileName;
mTitle = title;
initArgs();
}

/**
* 下载文件
*/
public void download() {
// 设置下载Url
Uri resource = Uri.parse(mUrl);
DownloadManager.Request request = new DownloadManager.Request(resource);

// 设置文件类型
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(mUrl));
request.setMimeType(mimeString);

// 下载完成时在进度条提示
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

// 存储sdcard目录的download文件夹
request.setDestinationInExternalPublicDir("/download/", mFileName);
request.setTitle(mTitle);

// 开始下载
mDownloadId = mDownloadManager.enqueue(request);
}

// 初始化
private void initArgs() {
mDownloadManager = (DownloadManager) mContext.getSystemService((Context.DOWNLOAD_SERVICE));
mContext.registerReceiver(mReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}

// 析构
private void destroyArgs() {
mContext.unregisterReceiver(mReceiver);
}

// 安装App
private void installApp(long downloadId) {
Intent install = new Intent(Intent.ACTION_VIEW);
Uri downloadFileUri = mDownloadManager.getUriForDownloadedFile(downloadId);
install.setDataAndType(downloadFileUri, APK_TYPE);
install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(install);
}

}