指定的孩子是否已经有父母？

Question

代码：

@Override
public Object instantiateItem(View view, int position) {

    View myView = views.get(position);
    myView.invalidate();

    ((ViewPager) view).removeView(myView);

    ((ViewPager) view).addView(myView); //Causing Error
    return myView;
}

错误日志：

com.testapp.main fatal error : The specified child already has a parent. 
You must call removeView() on the child's parent first.
java.lang.IllegalStateException: The specified child already has a parent. 
You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3378)
at android.view.ViewGroup.addView(ViewGroup.java:3249)
at android.support.v4.view.ViewPager.addView(ViewPager.java:1243)
at android.view.ViewGroup.addView(ViewGroup.java:3194)
at android.view.ViewGroup.addView(ViewGroup.java:3170)

我在添加子视图之前调用removeView()然后出现错误原因？