东西拼凑,最终弄出来能够用的代码
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public class
DownManagerTask {
private static
final
String TAG = "DownManagerTask" ;
private static
DownManagerTask DOWN_TASK = new DownManagerTask();
private Context
context;
private DownloadManager
downloadManager;
long downloadId
= - 1 ;
private Bitmap
bitmap;
private ImageView
imageView;
private DownManagerTask(){}
public static
DownManagerTask getInstance(){
return DOWN_TASK;
}
@SuppressLint ( "InlinedApi" )
public void
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" )
private void
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" )
public void
download(String url){
Log.d(TAG,
url);
Uri
uri = Uri.parse(url);
DownloadManager.Request
request = new DownloadManager.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, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
public void
unregisterReceiver(){
context.unregisterReceiver(receiver);
}
@SuppressLint ( "NewApi" )
public void
temp(){
Cursor
c = downloadManager.query( new DownloadManager.Query().setFilterById(downloadId));
if (c
!= null ){
c.moveToFirst();
Log.d(TAG,(c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME))));
c.close();
}
}
private BroadcastReceiver
receiver = new BroadcastReceiver()
{
@SuppressLint ( "NewApi" )
@Override
public void
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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