Android基于自带的DownloadManager实现下载功能示例

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(APK_URL));
request.setDestinationInExternalPublicDir(DOWNLOAD_FOLDER_NAME, DOWNLOAD_FILE_NAME);
request.setTitle(getString(R.string.download_notification_title));
request.setDescription("meilishuo desc");
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setVisibleInDownloadsUi(false);
// request.allowScanningByMediaScanner();
// request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
// request.setShowRunningNotification(false);
// request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
request.setMimeType("application/cn.trinea.download.file");
downloadId = downloadManager.enqueue(request);

request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);

class CompleteReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
   /**
    * get the id of download which have download success, if the id is my id and it's status is successful,
    * then install it
    **/
   long completeDownloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
   if (completeDownloadId == downloadId) {
    initData();
    updateView();
    // if download successful, install apk
    if (downloadManagerPro.getStatusById(downloadId) == DownloadManager.STATUS_SUCCESSFUL) {
     String apkFilePath = new StringBuilder(Environment.getExternalStorageDirectory().getAbsolutePath())
       .append(File.separator).append(DOWNLOAD_FOLDER_NAME).append(File.separator)
       .append(DOWNLOAD_FILE_NAME).toString();
     install(context, apkFilePath);
    }
   }
  }
 };

/** register download success broadcast **/
registerReceiver(completeReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

Cursor cur = downloadManager.query(query);

/**
 * 使用DownloadManager.Query查询Downloads的DB，但是在stackoverflow中的解释是
 * You can't access this DB from my application. For your own downloads,
 * use DownloadManager.Query to check on your download status. Data about downloads is not shared to other apps.
 */

/*String[] downNames = cursor.getColumnNames();
String str = "";
for(int i=0;i<downNames.length;i++){
 str += downNames[i]+",";
}*/
if(cursor!=null&&cursor.moveToLast()){
//       cursor.moveToPrevious()
 String displayname = cursor.getString(cursor.getColumnIndex("_display_name"));
 String name = cursor.getString(cursor.getColumnIndex("name"));
 String title = cursor.getString(cursor.getColumnIndex("title"));
 String description = cursor.getString(cursor.getColumnIndex("description"));
 String data = cursor.getString(cursor.getColumnIndex("_data"));
 String bucket = cursor.getString(cursor.getColumnIndex("bucket_display_name"));
 downloadTip.setText(displayname+","+name+","+title+","+description+","+data+","+bucket);
}