android download学习记录
东西拼凑，最终弄出来能够用的代码
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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
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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();
}
}
};
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