Android - get class inner variable

gistfile1.txt

//////////////////////////////////////////////////////////
//// @usage getClassField("mPageMargin", ViewPager.class)
//////////////////////////////////////////////////////////
public int getClassField(String fieldName, Class<?> clz) {
    try {
        Field thisField = clz.getDeclaredField(fieldName);
        return thisField.getInt(thisField);
    } catch (Exception e) {
        throw new RuntimeException("Not found field " + fieldName + ", Error : " + e.getMessage());
    }
}