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android download学习记录

2024-08-08 09:43:28   217人阅读

东西拼凑，终于弄出来可以用的代码

[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) {
            //这里可以取得下载的id，这样就可以知道哪个文件下载完成了。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();
            }
        }
    };
     
}

android download学习记录


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