DownloadManger的使用方法：二

来源：互联网发布：tostring方法的作用js 编辑：程序博客网时间：2024/06/08 08:56

之前的一篇文章讲的是DownloadManger的一些基本用法和参数设置。

这篇文章稍微深入讲解一些用法。

DownloadManager.Query

顾名思义，这个类就是用来查询的。他的一个重要的参数，ID就是上一篇讲到的，downloadManager.enqueue(request);的返回值。

下面我们来看一下这个类的基本用法。

 IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);        receiver = new DownloadCompleteReceiver();        registerReceiver(receiver, filter);

 class DownloadCompleteReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            long downloaded_id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);          /*  Log.d(getPackageName(), "下载完成：" + "downloaded_id =" + downloaded_id + "----" + "download_id=" + download_id1 + "");            Log.d(getPackageName(),"下载完成："+"downloaded_id ="+downloaded_id+"----" +"download_id="+download_id2+"");            if(download_id1 == downloaded_id){                Log.d(getPackageName(),"下载完成："+"downloaded_id ="+downloaded_id);            }            if(download_id2 == downloaded_id){                Log.d(getPackageName(),"下载完成："+"downloaded_id ="+downloaded_id);            }*/            DownloadManager.Query myQuery = new DownloadManager.Query();            myQuery.setFilterById(downloaded_id);            Cursor cursor = downloadManager.query(myQuery);            if (cursor.moveToFirst()) {                int id = cursor.getColumnIndex(DownloadManager.COLUMN_ID);                int media_type = cursor.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE);                int media_provider_uri = cursor.getColumnIndex(DownloadManager.COLUMN_MEDIAPROVIDER_URI);                int filename = cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME);                int total_size = cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES);                String download_id = cursor.getString(id);                String file_media_type = cursor.getString(media_type);                String provider_uri = cursor.getString(media_provider_uri);                String name = cursor.getString(filename);                String size = cursor.getString(total_size);                tv_id.setText(download_id);                tv_media_type.setText(file_media_type);                tv_media_uri.setText(provider_uri);                tv_filename.setText(name);                tv_size.setText(size);            }        }    }

上面的Receiver是监听下载完成广播的一个Receiver，下载的代码就不给出。

未完……

0 0