call back when loading . concode_field_sep BitmapSetter<T> bitmapSetter concode_field_sep void onPreLoad concode_elem_sep void onLoadCompleted concode_elem_sep Drawable getDrawable concode_elem_sep void onLoadFailed concode_elem_sep void setBitmap concode_elem_sep void onLoadStarted concode_elem_sep void setBitmapSetter concode_elem_sep void setDrawable