I need to save dataURL pdf file in phone's directory in Android using Cordova with ngCordova.My code is Given below:-

```
var dataURL="data:application/pdf;base64,JVBERi0xLjMKJf////8KNiAwIG9iago8PAovVHlwZSAvRX...";
$cordovaFile.createFile(cordova.file.externalRootDirectory,dataURL, true)
          .then(function (success) {
             alert('success');
          }, function (error) {
            alert('Fails');
          });

```

It not working.I need to save PDF in dataURL format using Cordova Android.How to do it.