android download学习记录

东西拼凑，最终弄出来能够用的代码

[1].[代码] [Java]代码 跳至 [1]

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publicclass DownManagerTask {         privatestatic final String TAG = "DownManagerTask";         privatestatic DownManagerTask DOWN_TASK = newDownManagerTask();         privateContext context;     privateDownloadManager downloadManager;     longdownloadId = -1;     privateBitmap bitmap;     privateImageView imageView;                 privateDownManagerTask(){}         publicstatic DownManagerTask getInstance(){         returnDOWN_TASK;     }         @SuppressLint("InlinedApi")     publicvoid init(Context context,ImageView imageView){         this.context = context;         this.imageView = imageView;         downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);     }         /**      * 将下载的图片转化成bitMap      *      */     @SuppressLint("NewApi")     privatevoid parseBitMap(){         try{             ParcelFileDescriptor pfd = downloadManager.openDownloadedFile(downloadId);             FileDescriptor fileDescriptor = pfd.getFileDescriptor();              bitmap = BitmapFactory.decodeFileDescriptor(fileDescriptor);              pfd.close();         }catch(Exception e){              e.printStackTrace();         }     }         /**      * 下载方法      * @param url      */     @SuppressLint("NewApi")     publicvoid download(String url){         Log.d(TAG, url);         Uri uri = Uri.parse(url);         DownloadManager.Request request = newDownloadManager.Request(uri);         request.setAllowedNetworkTypes(Request.NETWORK_MOBILE                 | Request.NETWORK_WIFI);         request.setAllowedOverRoaming(false);         MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();         String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap                 .getFileExtensionFromUrl(url));         request.setMimeType(mimeString);         //request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Bugdroid.png");          request.allowScanningByMediaScanner();         request.setVisibleInDownloadsUi(true);         downloadId = downloadManager.enqueue(request);         Log.d(TAG,"downloadId:"+downloadId);         context.registerReceiver(receiver,newIntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));     }         publicvoid unregisterReceiver(){         context.unregisterReceiver(receiver);     }         @SuppressLint("NewApi")     publicvoid temp(){         Cursor c = downloadManager.query(newDownloadManager.Query().setFilterById(downloadId));         if(c != null){             c.moveToFirst();             Log.d(TAG,(c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME))));             c.close();         }     }         privateBroadcastReceiver receiver = newBroadcastReceiver() {                 @SuppressLint("NewApi")         @Override         publicvoid onReceive(Context context, Intent intent) {             //这里能够取得下载的id，这样就能够知道哪个文件下载完毕了。适用与多个下载任务的监听             if(intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)){                 Log.v(TAG,""+intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,0));                  Log.v(TAG,"download complete");                  parseBitMap();                  imageView.setImageBitmap(bitmap);                  Toast.makeText(context,"download complete", Toast.LENGTH_SHORT).show();             }         }     };