片段替换不起作用

Question

I'm having a radio group that changes my fragments in the activity when a the selected radiobutton is changed.我有这个代码：

@Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId) {
            case R.id.main_menu1:
                showOffersFragment();
                break;
            case R.id.main_menu2:
                openMap();
                break;
            case R.id.main_menu3:
                showProductsFragment();
                break;
        }
    }

    private void showProductsFragment() {
        fm = getFragmentManager();
        ft = fm.beginTransaction();
        if (productsFragment == null) {
            bundle = new Bundle();
            bundle.putSerializable(ActivityConstants.PRODUCT_ITEMS, products);
            productsFragment = new ProductFragment();
            productsFragment.setArguments(bundle); ft.add(R.id.main_frag_container, productsFragment, "products");

        } else {
            //TODO
            ft.replace(R.id.main_frag_container, productsFragment, "products");
            productsFragment.loadList(products);
        }

        ft.commit();
    }
private void showOffersFragment() {
        Log.d(TAG, "OFFERS NULL OR :" + (offersFragment == null)+" ITEMS ="+items.size());

        fm = getFragmentManager();
        ft = fm.beginTransaction();

        if (offersFragment == null) {
            bundle = new Bundle();
            bundle.putSerializable(ActivityConstants.OFFER_ITEMS, items);
            offersFragment = new OffersFragment();
            offersFragment.setArguments(bundle);
            ft.add(R.id.main_frag_container, offersFragment,"offers");
        } else {
            ft.replace(R.id.main_frag_container, offersFragment,"offers");
        }
        ft.commit();
    }
  private void openMap() {
        fm = getFragmentManager();
        ft = fm.beginTransaction();
        if(mapFragment==null){
            mapFragment = new MapFragment();
            ft.add(R.id.main_frag_container, mapFragment, "Map");
        }else{
            ft.replace(R.id.main_frag_container, mapFragment, "Map");
        }
        ft.commit();
        mapFragment.getMapAsync(this);
    }

现在的问题是当我在片段之间切换时。它不会立即更改片段，因此响应不是很好。我应该在它们之间切换几次，这样片段才能出现。

谁能告诉我怎样才能optimize/make它正常工作？

Answer 1

它不会立即响应，因为一开始，一旦你选择了每个选项，这一行是运行 ft.add(R.id.main_frag_container, mapFragment, "Map");，这意味着你正在将新片段添加到同一个容器中，而不是更换旧的。

使用 ft.replace(R.id.main_frag_container, mapFragment, "Map"); 而不是 ft.add(R.id.main_frag_container, mapFragment, "Map");。虽然我可能是错的，但容器（这里 R.id.main_fragment_container）必须已经添加了片段，一种选择是仅当容器为空时才添加片段，否则替换。

如果您想返回之前的片段，您可能需要选中 addToBackStack。

片段替换不起作用

Fragment replace doesnt work

java

android

android-fragments

android-radiogroup