java - AmazonS3Client.putObject doesn't work if I call AmazonS3Client.listObjects first -

i've been trying long time solve this, without success. i'm using aws android sdk upload files aws s3, , files upload server, others doesn't. putobject instruction executed, "hangs up" , lock code execution on line.

by trying comment pieces of code find source of problem, concluded happens because call listobjects before uploads.

i can't remove listobjects because need fetch file names when app starts, , uploads take place after user selected wants upload.

i upload photos cell, 1 1.3 mb, , concludes upload in less 30 seconds. if call listobjects "hangs up". why happenning? have clue of going on? here goes few lines of code:

during android oncreate:

weather_data = new arraylist<weather>();         objectlisting objectlisting = s3client.listobjects(new listobjectsrequest().withbucketname(lista_de_baldes.get(0).getname()).withprefix("thumbs")); (s3objectsummary objectsummary : objectlisting.getobjectsummaries())     weather_data.add(new weather(r.drawable.jogo, objectsummary.getkey().replace("thumbs/", ""))); 

after user selected photo upload (executed during doinbackground class extends asynctask prevent main thread freezing):

file arquivo = new java.io.file(filepath); putobjectrequest por = new putobjectrequest(     lista_de_baldes.get(0).getname(),     filepath.substring(filepath.lastindexof('/') + 1),     arquivo ); s3client.putobject(por); 

they ulso using same bucket, same region , same zone. objectlisting runs fine.

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edit: "solved" problem setting amazons3client variable again in upload code. this:

s3client = new amazons3client(            new basicawscredentials(constants.access_key_id, constants.secret_key)        ); s3client.setregion(region.getregion(regions.sa_east_1)); 

but doesn't make sense me, because global variable. looks simples got "locked" after downloaded list of objects. have idea going on?

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edit: requested, here goes more of code.

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      s3client = new amazons3client(                    new basicawscredentials(constants.access_key_id, constants.secret_key)                    );     //mudei de us_west_2 para sa_east_1 (south america) para acessar um bucket criado em sp/brazil     s3client.setregion(region.getregion(regions.sa_east_1));      lista_de_baldes = s3client.listbuckets();      setcontentview(r.layout.main);      weather_data = new arraylist<weather>();             objectlisting objectlisting = s3client.listobjects(new listobjectsrequest().withbucketname(lista_de_baldes.get(0).getname()).withprefix("thumbs"));     (s3objectsummary objectsummary : objectlisting.getobjectsummaries()) {         file arquivo_thumb = new file(getcachedir() + file.separator + objectsummary.getkey().replace("thumbs/", ""));         weather_data.add(new weather(r.drawable.jogo, arquivo_thumb.getname().replace(".png", ".jpg")));          if(arquivo_thumb.exists())             continue;          inputstream input = null;         try {             responseheaderoverrides override = new responseheaderoverrides();             override.setcontenttype("image/jpeg");             generatepresignedurlrequest urlrequest = new generatepresignedurlrequest(                     lista_de_baldes.get(0).getname(),                     "thumbs/" + arquivo_thumb.getname()                     );             urlrequest.setresponseheaders(override);             url url = s3client.generatepresignedurl(urlrequest);                             ...          } 

the upload part:

     protected s3taskresult doinbackground(uri... uris) {          if (uris == null || uris.length != 1) {             return null;         }          // file location of image selected.         uri selectedimage = uris[0];          string[] filepathcolumn = { mediastore.images.media.data };          cursor cursor = getcontentresolver().query(selectedimage,                 filepathcolumn, null, null, null);         cursor.movetofirst();          int columnindex = cursor.getcolumnindex(filepathcolumn[0]);         filepath = cursor.getstring(columnindex);         cursor.close();          s3taskresult result = new s3taskresult();          // put image data s3.         try {                                // content type determined file extension.             file arquivo = new java.io.file(filepath);             putobjectrequest por = new putobjectrequest(                     lista_de_baldes.get(0).getname(),                     filepath.substring(filepath.lastindexof('/') + 1),                     arquivo                     );             por.setcannedacl(cannedaccesscontrollist.publicread);             s3client.putobject(por); 

is listobjects wrapped in asynctask? wait until listobjects finishes? fyi, since honeycomb level 11, multiple asynctask instances executed sequentially default.