Android 如何使用Dialogfragment和ArrayAdapter创建列表对话框来填充Java类中的项？

我正在自学。除了通过按钮传递意图，我从未尝试过任何事情，所以我并没有走到正确的方向

我想学习所有可能的方法

它与使用ListFragment创建列表不同吗

主活动上有两个按钮。单击第二个按钮，它将打开一个带有项目列表的DialogFragment，单击列表项目将在浏览器中打开一个URL

主要活动

btnDepartment.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Intent intent = new Intent(MainActivity.this, DepartmentActivity.class);
                //startActivity(intent);

            }

        });

这是Department类，它是一个纯Java类

public class Department {
    private String deptName, deptUrl;


    public static final Department[] myDepartment = {

            new Department("CS", "http://cs.com"),
            new Department("Biology", "http://bio.com"),
            new Department("Chemistry", "http://www.chemistry.com"),
            new Department("Nursing", "http://nursing.com")
    };

    private Department(String deptName, String deptUrl){
        this.deptName = deptName;
        this.deptUrl = deptUrl;

    }

    public String getDeptName() {
        return deptName;
    }

    public String getDeptUrl() {
        return deptUrl;
    }

    @Override
    public String toString() {
        return deptName;
    }

}

部门碎片

public class DepartmentFragment extends DialogFragment {

    public DepartmentFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_department, container, false);
    }

}

[创建DialogFragment]与使用ListFragment创建列表不同吗

简单地说：是的

为什么?？因为

ListFragment

允许您访问类的

getListView（）

和

setAdapter（）

以及实例方法

为了对不从

ListFragment

扩展的任何其他片段类执行此操作，必须使用

ListView

声明一些XML布局，并执行以下操作

我假设

fragment\u department.xml

包含

@+id/list

的

ListView

元素，并且您不关心部门信息的显示方式

public class DepartmentFragment extends DialogFragment {

    public DepartmentFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_department, container, false);

        ListView lstView = (ListView) rootView.findViewById(R.id.list);

        ArrayAdapter<Department> adapter = new ArrayAdapter<Department>(getActivity(), android.R.layout.simple_list_item_1, Department.myDepartment);
        lstView.setAdapter(adapter);

        // TODO: adapter.setOnItemClickListener 
        //    ... handle click
        //    ... load webpage

        return rootView;
    }

}

公共类DepartmentFragment扩展了DialogFragment{ 公共部门片段（）{ //必需的空公共构造函数 } @凌驾 创建视图上的公共视图（布局、充气机、视图组容器、， Bundle savedInstanceState）{ //为该碎片膨胀布局 视图根视图=充气机。充气（R.layout.fragment\u部门，容器，假）； ListView lstView=（ListView）rootView.findViewById（R.id.list）； ArrayAdapter=新的ArrayAdapter（getActivity（），android.R.layout.simple\u list\u item\u 1，Department.myDepartment）； lstView.setAdapter（适配器）； //TODO:adapter.setOnItemClickListener //…点击手柄 //…加载网页 返回rootView； } }

---

首先，您的模型必须实现可包裹：

public class Department implements Parcelable {
    private String deptName, deptUrl;


    public static final Department[] myDepartment = {

            new Department("CS", "http://cs.com"),
            new Department("Biology", "http://bio.com"),
            new Department("Chemistry", "http://www.chemistry.com"),
            new Department("Nursing", "http://nursing.com")
    };

    private Department(String deptName, String deptUrl){
        this.deptName = deptName;
        this.deptUrl = deptUrl;

    }

    protected Department(Parcel in) {
        deptName = in.readString();
        deptUrl = in.readString();
    }

    public static final Creator<Department> CREATOR = new Creator<Department>() {
        @Override
        public Department createFromParcel(Parcel in) {
            return new Department(in);
        }

        @Override
        public Department[] newArray(int size) {
            return new Department[size];
        }
    };

    public String getDeptName() {
        return deptName;
    }

    public String getDeptUrl() {
        return deptUrl;
    }

    @Override
    public String toString() {
        return deptName;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeString(deptName);
        parcel.writeString(deptUrl);
    }
}

片段如下：

public class DepartmentFragment extends DialogFragment {

    private Department department;

    public DepartmentFragment() {
        // Required empty public constructor
    }

    public static DepartmentFragment newInstance(Department department) {
        DepartmentFragment f = new DepartmentFragment();

        // Supply num input as an argument.
        Bundle extras = new Bundle();
        args.putParcelable("department", department);
        f.setArguments(args);

        return f;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        department = getArguments().getParcelable("department")
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_department, container, false);
    }

}

此外，您还可以在以下位置查看所有信息：

public class DepartmentFragment extends DialogFragment {

    private Department department;

    public DepartmentFragment() {
        // Required empty public constructor
    }

    public static DepartmentFragment newInstance(Department department) {
        DepartmentFragment f = new DepartmentFragment();

        // Supply num input as an argument.
        Bundle extras = new Bundle();
        args.putParcelable("department", department);
        f.setArguments(args);

        return f;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        department = getArguments().getParcelable("department")
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_department, container, false);
    }

}