RelativeRadioGroup.java 文件源码

/**
 * {@inheritDoc}
 */
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
public void onChildViewAdded(View parent, View child) {
    if (parent == RelativeRadioGroup.this && child instanceof RadioButton) {
        int id = child.getId();
        // generates an id if it's missing
        if (id == View.NO_ID) {
            id = View.generateViewId();
            child.setId(id);
        }
        ((RadioButton) child).setOnCheckedChangeListener(mChildOnCheckedChangeListener);
    }

    if (mOnHierarchyChangeListener != null) {
        mOnHierarchyChangeListener.onChildViewAdded(parent, child);
    }
}