android - Cordova file plugin - save file in device -

i'm having lot of troubles saving files in android.
project hybrid application developed ionic these plugins:

com.phonegap.plugins.fileopener 1.0.0 "file opener" com.telerik.plugins.nativepagetransitions 0.4.2 "native page transitions" cordova-plugin-compat 1.0.0 "compat" cordova-plugin-crosswalk-webview 2.0.0 "crosswalk webview engine" cordova-plugin-file 4.2.0 "file" cordova-plugin-network-information 1.2.2-dev "network information" cordova-plugin-whitelist 1.2.3-dev "whitelist" cordova-plugin-wkwebview-engine 1.0.4-dev "cordova wkwebview engine" ionic-plugin-keyboard 2.2.1 "keyboard" 

android platform version 5.2.1
device i'm using samsung a7

this abstract androidmanifest.xml

<uses-sdk android:minsdkversion="16" android:targetsdkversion="23" /> <uses-permission android:name="android.permission.access_wifi_state" /> <uses-permission android:name="android.permission.internet" /> <uses-permission android:name="android.permission.access_network_state" /> <uses-permission android:name="android.permission.write_external_storage" /> <uses-permission android:name="android.permission.read_external_storage" /> 

case1

if try snippet (actually working on project)

var storagepath = "/storage/emulated/0";  var filedir = cordova.file.externaldatadirectory.replace(cordova.file.externalrootdirectory, '');  var filename = $scope.ngdocument.documentid + ".pdf"  var filepath = storagepath + "/" + filedir + filename;  $cordovafile.writefile(filepath, binary_arr, {'append': false}).then(function(result) {}, function(err) {});

i {"code":5,"message":"encoding_err"} callback $cordovafile.writefile, no matter if use absolute path, relative path, file name , no file ever created.

case2

with snippet

window.requestfilesystem(localfilesystem.persistent, 0, function (fs) {    console.log('file system open: ' + fs.name);    fs.root.getfile(filename, { create: true, exclusive: false }, function (fileentry) {      console.log("fileentry:" + json.stringify(fileentry));      writefile(fileentry, binary_arr);    }, function(data){});  }, function(data){});

happen 2 different things

case 2.1

if no config options specified in config.xml app creates empty folder /storage/emulated/0/android/media/{myapp}

case 2.2

with these 2 preferences

<preference name="androidpersistentfilelocation" value="compatibility" /> <preference name="androidextrafilesystems" value="cache" /> 

a file in /storage/emulated/0 (external ssd) created , in logcaterrors are:

e/vold    ( 2280): failed find mounted volume /storage/extsdcard/android/data/{myapp}/files/ w/vold    ( 2280): returning operationfailed - no handler errno 0 w/contextimpl(13364): failed ensure directory: /storage/extsdcard/android/data/{myapp}/files e/vold    ( 2280): failed find mounted volume /storage/extsdcard/android/data/{myapp}/files/ w/vold    ( 2280): returning operationfailed - no handler errno 0 w/contextimpl(13364): failed ensure directory: /storage/extsdcard/android/data/{myapp}/files e/vold    ( 2280): failed find mounted volume /storage/extsdcard/android/data/{myapp}/cache/ w/vold    ( 2280): returning operationfailed - no handler errno 0 w/contextimpl(13364): failed ensure directory: /storage/extsdcard/android/data/{myapp}/cache 

the strange fact /storage/extsdcard (symbolic link /mnt/extsdcard) not mounted while external ssd mounted on /mnt/sdcard

please help: i'm headbanging.
first snippet working charm in project. version of ngcordova?

solved:

after several attempts solved in way

in config.xml:

<preference name="androidpersistentfilelocation" value="compatibility" /> <preference name="androidextrafilesystems" value="files,cache, sdcard, cache-external, files-external" /> 

and main function:

window.requestfilesystem(localfilesystem.persistent, 0, function (fs) {        //var abspath = "file:///storage/emulated/0/";      var abspath = cordova.file.externalrootdirectory;      var filedir = cordova.file.externaldatadirectory.replace(cordova.file.externalrootdirectory, '');      var filename = "somename.txt";      var filepath = filedir + filename;        fs.root.getfile(filepath, { create: true, exclusive: false }, function (fileentry) {          writefile(fileentry, binary_arr).then(function(){            //do here          });      }, function(err) {});  }, function(err) {});    function writefile(fileentry, dataobj) {      return $q(function (resolve, reject) {          fileentry.createwriter(function (filewriter) {              filewriter.onwriteend = function () {                  resolve();              };              filewriter.onerror = function (e) {                  reject(e);              };              filewriter.write(dataobj);          });      });  }

it seemed that:

<preference name="androidpersistentfilelocation" value="internal" /> 

that default configuration, not allow app write external disk (whether physical or emulated). instead allowed app write /data/data/{myapp}/files