片段替换不起作用

时间:2015-02-13 09:56:16

标签: java android android-fragments android-radiogroup

当所选的单选按钮改变时,我有一个无线电组可以改变活动中的碎片。我有这段代码:

@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);
    }

现在问题是我在片段之间切换。它不会马上改变这些地方,所以它没有很好地回应。我应该在它们之间切换几次,以便片段出现。

有谁能告诉我如何优化/使其正常工作?

1 个答案:

答案 0 :(得分:1)

它没有立即响应,因为一开始,一旦你选择了每个选项,这一行就会运行ft.add(R.id.main_frag_container, mapFragment, "Map");,这意味着你要将新片段添加到同一个容器中而不是替换旧的片段。 / p>

使用ft.replace(R.id.main_frag_container, mapFragment, "Map");代替ft.add(R.id.main_frag_container, mapFragment, "Map");。虽然我可能错了,但容器(此处为R.id.main_fragment_container)必须已经添加了片段,一个选项是仅在容器为空时添加片段,否则替换。

如果您希望浏览以前的片段,可能需要检查addToBackStack