title: file.mkdirs() not working
body: <p>i want to write to a file in the sdcard of my phone.i used the below code to do this.</p>
  
  <pre><code>private  CSVWriter _writer;
  private  File _directory;
  public  String _fileTestResult;
  private  String PATH_FILE_EXPORT = "/applications/foru/unittestframework/";
  public ExportData(){
      _writer=null;
      _directory = new File(Environment.getExternalStorageDirectory () +PATH_FILE_EXPORT);
      if(!_directory.exists())    
          _directory.mkdirs();
  
  }
  
  public  void exportResult(String testcaseNum,String testcase,String status){
  
  
      try {
  
          if(_directory.exists()){
             //do something
          }
  </code></pre>
  
  <p>but mkdirs() is not working.so i could not excecute following code in the if condition.please help me.</p>
  
  <p>note:i have given the permission in manifest file.</p>
  
  <p><strong>EDIT:</strong>
  i am using this file write option for storing the result of automation testing using robotium.i have created a normal project and tried to create directory in sdcard.but the same code when i am using in this testproject it is not working.why like that?dont unit testing framework support this?</p>