android - 不能从静态上下文中引用非静态方法 getChildFragmentManager()

Question

在 fragment 中，我尝试在静态方法中使用 getChildFragmentManager()。但它显示错误并建议我使方法不是静态的。

Non static method getChildFragmentManager() cannot be referenced from a static context

fragment :

public class C_Fragment extends android.support.v4.app.Fragment

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {



        return inflater.inflate(R.layout.fragment_a, container, false);
    }

 static void updateProductList(){
        final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                if (getChildFragmentManager().findFragmentByTag("kz.dreamwings.unimax.fragments.C_Category_A_prudacts")!=null) {
//                            C_Category_A_prudacts.adapter.notifyDataSetChanged();
                    Fragment frg = null;
                    frg = getChildFragmentManager().findFragmentByTag("kz.dreamwings.unimax.fragments.C_Category_A_prudacts");
                    final FragmentTransaction ft = getChildFragmentManager().beginTransaction();
                    ft.detach(frg);
                    ft.attach(frg);
                    ft.commit();
                }
            }
        }, 300);
    }

Answer 1

是的，您不能从静态上下文访问非静态上下文。您正在尝试在静态方法中获取 fragment 实例，您应该在静态方法之外执行此操作，以便您可以访问 getChildFragmentManager()。

private static Fragment fragment;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {

    fragment = getChildFragmentManager().findFragmentByTag("kz.dreamwings.unimax.fragments.C_Category_A_prudacts");

    //.... other code
}

static void updateProductList(){
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            if (fragment!=null) {
                //.... other code
            }
            }
        }, 300);
    }