How to load dataset from internal or external storage?

Hi guys,

I have been stuck with the Dataset loading problem for several days.I know that xml files can be loaded from Android internal or external storage ,but I don't know how to write the path.Every storage type I had tried but none of them worked .Please help me !!!

Here is my code:

......

copy(mDatasetString);

if (!mDataset.load("storage/sdcard/"+mDatasetString,                 STORAGE_TYPE.STORAGE_APP)){             Log.d("DBload", "doLoadTrackersData: failed to load Dataset");

            return false;}

......

public void copy(String datasetName){         try {             String xml=null;             InputStream inputStream = getAssets().open(datasetName);             byte[] bytes = new byte[1024];             ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();             while (inputStream.read(bytes) != -1) {                 arrayOutputStream.write(bytes, 0, bytes.length);             }             arrayOutputStream.close();             xml = new String(arrayOutputStream.toByteArray());             String dir= "storage/sdcard/";             FileOutputStream openFileOutput = new FileOutputStream(dir+datasetName);             openFileOutput.write(xml.getBytes());             openFileOutput.flush();             inputStream.close();             openFileOutput.close();         }         catch(IOException e){             e.printStackTrace();         }

    } 

I have added the users permission.

And the dialog still tell me that "Failed to load trackers data!" and logcat has message "doLoadTrackersData: failed to load Dataset".

Please help me if I missed something !