Android refuses to read files -


i trying load mp3 files array, android keeps showing error : java.lang.nullpointerexception: attempt length of null array, error in line : if(path.isdirectory() && path.listfiles().length > 0)

i added these 2 permission lines manifest files, there no effect :

<uses-permission android:name="android.permission.read_external_storage"/> <uses-permission android:name="android.permission.write_external_storage"/>

my function called : locatesongs(environment.getexternalstoragedirectory());

and function iterate full device : 

 private void locatesongs(file path) {         if(path.isdirectory() && path.listfiles().length > 0){             file files[] = path.listfiles();             for(file f : files){                 locatesongs(f.getabsolutefile());             }         }else if(path.isfile() && path.getname().contains(".mp3")){ // // todo: 2/5/2016 add more types other mp3             mediametadataretriever metaretriver = new mediametadataretriever();             metaretriver.setdatasource(path.getabsolutepath());              song newsong = new song();             newsong.setalbum(metaretriver.extractmetadata(mediametadataretriever.metadata_key_album));             newsong.setartist(metaretriver.extractmetadata(mediametadataretriever.metadata_key_artist));             newsong.setauthor(metaretriver.extractmetadata(mediametadataretriever.metadata_key_author));             newsong.setname(metaretriver.extractmetadata(mediametadataretriever.metadata_key_title));             newsong.setbitrate(metaretriver.extractmetadata(mediametadataretriever.metadata_key_bitrate));             newsong.setgenre(metaretriver.extractmetadata(mediametadataretriever.metadata_key_genre));             newsong.setdatasourse(path.getabsolutepath());             newsong.setduration(metaretriver.extractmetadata(mediametadataretriever.metadata_key_duration));              byte[] art = metaretriver.getembeddedpicture();             bitmap songimage = bitmapfactory.decodebytearray(art, 0, art.length);             newsong.setimage(songimage);         }     }

thanks tried help, i've found solution, problem due using android 6.0 (marshmallow) emulator, problem solved here : http://developer.android.com/training/permissions/requesting.html


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