将包从 Main Activity 发送到 Fragment

Question

我已经按照 google 教程进行操作，在我的代码中没有发现任何错误，但由于某种原因，我的包中的数据似乎不是从我的 Main Activity 发送的到我的片段（我的应用程序一直返回“0.00”）。请帮忙。

主要ACTIVITY:

@Override
public void assignButtonBWHW1Clicked(String assignButtonBWHWClicked) {

    if (assignButtonBWHWClicked.equals(assignButtonBWHWClicked)) {

        assignFragment1 = new assignFragment1();
        buttonsGeneric = new genericBackNextFragment();

        splitItFragmentManager3 = getFragmentManager();
        splitItFragmentTransaction3 = splitItFragmentManager3.beginTransaction();
        splitItFragmentTransaction3.replace(R.id.fragment_container, assignFragment1);

        splitItFragmentTransaction3.replace(R.id.fragment_container_2, buttonsGeneric);
        splitItFragmentTransaction3.addToBackStack(null);

        splitItFragmentTransaction3.commit();

        Bundle bundleAssign = new Bundle();
        bundleAssign.putDouble("price1", 22);
        assignFragment1.setArguments(bundleAssign);

    }
}

片段：

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

    assignFragment1View = inflater.inflate(R.layout.assign_fragment_1, container, false);

    item1 = (TextView) assignFragment1View.findViewById(R.id.assign1_food_item_1);
    item2 = (TextView) assignFragment1View.findViewById(R.id.assign1_food_item_2);
    priceItem1 = (TextView) assignFragment1View.findViewById(R.id.assign1_price_item_1);
    priceItem2 = (TextView) assignFragment1View.findViewById(R.id.assign1_price_item_2);

    Bundle bundleAssign = this.getArguments();
    Double price1Double = bundleAssign.getDouble("priceItem1", 0.00);
    priceItem1.setText(String.valueOf(price1Double));

    return assignFragment1View;
}

Answer 1

尝试

Bundle bundleAssign = getArguments();

或者，
Bundle bundleAssign = getActivity().getArguments()

而不是

Bundle bundleAssign = this.getArguments();

像

一样获得价值

double result = bundleAssign.getDouble("price1");

Answer 2

尝试在获得片段管理器之前将包初始化放置到片段中。

if (assignButtonBWHWClicked.equals(assignButtonBWHWClicked)) {

    assignFragment1 = new assignFragment1();
    buttonsGeneric = new genericBackNextFragment();

    Bundle bundleAssign = new Bundle();
    bundleAssign.putDouble("price1", 22);
    assignFragment1.setArguments(bundleAssign);

    splitItFragmentManager3 = getFragmentManager();
    splitItFragmentTransaction3 = splitItFragmentManager3.beginTransaction();
    splitItFragmentTransaction3.replace(R.id.fragment_container, assignFragment1);

    splitItFragmentTransaction3.replace(R.id.fragment_container_2, buttonsGeneric);
    splitItFragmentTransaction3.addToBackStack(null);

    splitItFragmentTransaction3.commit();

}

Answer 3

只需将 fragment 一侧的 key 从 priceItem1 更新为 price1。

Double price1Double = bundleAssign.getDouble("priceItem1", 0.00);

到

Double price1Double = bundleAssign.getDouble("price1", 0.00);

让事情发生 clear.this 是因为您使用单独的密钥，同时将数据添加到捆绑包并使用不同的密钥进行检索。所以它返回 default value 即 0.00 那个 priceItem1 key

Answer 4

您必须在代码中进行两项更改。
第一项是在交易前设置参数

if (assignButtonBWHWClicked.equals(assignButtonBWHWClicked)) {

        assignFragment1 = new assignFragment1();
        Bundle bundleAssign = new Bundle();
        bundleAssign.putDouble("price1", 22);
        assignFragment1.setArguments(bundleAssign);
        buttonsGeneric = new genericBackNextFragment();

        splitItFragmentManager3 = getFragmentManager();
        splitItFragmentTransaction3 = splitItFragmentManager3.beginTransaction();
        splitItFragmentTransaction3.replace(R.id.fragment_container, assignFragment1);

        splitItFragmentTransaction3.replace(R.id.fragment_container_2, buttonsGeneric);
        splitItFragmentTransaction3.addToBackStack(null);

        splitItFragmentTransaction3.commit();



    }

第二个始终使用相同的密钥来设置和检索包中的数据，因此请更改片段

  Double price1Double = bundleAssign.getDouble("priceItem1", 0.00);

至

  Double price1Double = bundleAssign.getDouble("price1", 0.00);

将包从 Main Activity 发送到 Fragment

Sending Bundle from Main Activity to Fragment

android

bundle

android-fragments

android-studio