dialog position

        AlertDialog.Builder builder;

        float density = mContext.getResources().getDisplayMetrics().density;

        builder = new AlertDialog.Builder(mContext);

        builder.setSingleChoiceItems(mAdapter, mSelectedIndex, itemClickListener);

        mDialog = builder.create();

        mDialog.setCanceledOnTouchOutside(true);

        mDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);//|Window.FEATURE_ACTION_BAR_OVERLAY);

        mDialog.show();

        WindowManager.LayoutParams windowParam = mDialog.getWindow().getAttributes();

        windowParam.gravity = Gravity.TOP | Gravity.LEFT;

        windowParam.x = -(int)(11*density);

        windowParam.y = getBottom()-(int)(8*density);

        windowParam.width = getWidth()+(int)(35*density);

        windowParam.flags = WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS; // FLAG_LAYOUT_NO_LIMITS is important set for zero left position.

        mDialog.getWindow().setAttributes(windowParam);