Question

我正在创建一个包含片段的应用，用户可以使用按钮打开微调器并选择食物项目。然后食物项目将显示在列表中的按钮下。我尝试过创建文本视图并制作不可见的文本视图并稍后设置文本，但没有一个有效。我想知道是否有人知道更好的创造方式，我没有看到。

screenshot

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.lastineindustries.ingredismartv2.Kitchen">

<!-- TODO: Update blank fragment layout -->

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <Button
        android:text="Add An Ingredient"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/add"
        android:textSize="30sp"
        android:layout_gravity="center" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <LinearLayout
            android:layout_width="320dp"
            android:layout_height="match_parent"
            android:id="@+id/main"
            android:orientation="vertical">


        </LinearLayout>

        <LinearLayout
            android:layout_width="60dp"
            android:layout_height="match_parent"
            android:id="@+id/valueButton"
            android:orientation="vertical">

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

Answer 1

这是你想要的吗？

然后，阅读我的代码。

ChooseFoodFragment.java的代码及其布局文件：

public class ChooseFoodFragment extends Fragment{

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_choose_food, container, false);
        initViews(v);
        return v;
    }

    private Button btn_add;
    private ListView listView;
    private List<String> mData = new ArrayList<>();
    private ArrayAdapter<String> mAdapter;


    private void initViews(View v) {
        listView = v.findViewById(R.id.list);
        mAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, mData);
        listView.setAdapter(mAdapter);

        btn_add = v.findViewById(R.id.add);
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ChooseFoodDialog dialog = new ChooseFoodDialog();
                dialog.setOnSelectedListener(new ChooseFoodDialog.OnSelectedListener() {
                    @Override
                    public void onSelected(String name) {
                        mData.add(name);
                        mAdapter.notifyDataSetChanged();// update the list of selected food
                    }
                });
                dialog.show(getFragmentManager(), "");//show the spinner items to select
            }
        });
    }
}

fragment_choose_food.xml，只需删除除根视图和按钮之外的其他视图，然后添加ListView。

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.lastineindustries.ingredismartv2.Kitchen">

    <!-- TODO: Update blank fragment layout -->

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <Button
            android:id="@+id/add"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="Add An Ingredient"
            android:textSize="30sp" />

        <ListView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="16dp" />

    </LinearLayout>
</FrameLayout>

ChooseFoodDialog.java的代码及其布局文件。

public class ChooseFoodDialog extends DialogFragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = LayoutInflater.from(getContext()).inflate(R.layout.dialog_choose_food, container, false);
        initViews(v);
        return v;
    }

    private ListView lv;
    private List<String> mData = new ArrayList<>();

    private void initViews(View v) {
        // prepare some temp data
        for (int i = 0; i < 10; i++) {
            mData.add("Ingredients_" + i);
        }

        lv = v.findViewById(R.id.lv_ingredients);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, mData);
        lv.setAdapter(adapter);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                String ingredient = mData.get(i);
                if (mListener != null) {
                    mListener.onSelected(ingredient);// when the item of food is selected
                }
                dismiss();
            }
        });

    }

    private OnSelectedListener mListener;

    public void setOnSelectedListener(OnSelectedListener listener) {
        mListener = listener;
    }


    interface OnSelectedListener {
        void onSelected(String name);
    }
}

dialog_choose_food.xml，这很简单。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/lv_ingredients"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

运行程序，检查它。

Answer 2

您应该使用ListView或RecyclerView来执行此类任务。查看官方Android文档中的示例：link。

显示数据的有效方式

2 个答案: