Android - DownloadManager的使用

DownloadManager是Android的基础类, 用于下载文件, 完成自动更新的功能.
使用方式

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

代码

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);      }    }