I am using the below code for reading my file and it is working fine, but now I want to add new text to that file. Please help me

```
private void loadingDictionary() {
// TODO Auto-generated method stub
    AssetManager mgr;

    try{
        mgr = getAssets();
        InputStream is = mgr.open("dictinary.txt");
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        StringBuilder  stringBuilder = new StringBuilder();
        String ls = ",";
        while(( line = br.readLine() ) != null){
        stringBuilder.append( line );
        stringBuilder.append( ls );
    }
    dictinaryLines = stringBuilder.toString();
    dictLinesArray = dictinaryLines.split(ls);
    }
    catch(IOException e1){
    }

}

```

I want to append the new text to the already existing data.
Please help me.