title: How to check if AlertDialog.builder is showing and cancelling it if its showing?
body: <p>Here is my code -</p>
  
  <pre><code>View layout = LayoutInflater.from(this).inflate(R.layout.dialog_loc_info, null);
  final Button mButton_Mobile = (Button) layout.findViewById(R.id.button);
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setView(layout);
  mButton_Mobile.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View arg0) {
          if(builder.)
              showDialog(); // this is another dialog, nothing to do with this code
          }
      });
  builder.setNeutralButton(getString(android.R.string.ok),
                           new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
          dialog.dismiss();
      }
  });
  builder.show();
  </code></pre>