java - 在android中的 ListView 的每一行添加一个按钮？

Question

我想向 ListView 的每一行添加两个按钮。我想将它们添加到自定义适配器中。这两个按钮分别用于编辑和删除。以下是我的适配器代码。

public class RoleList extends ArrayAdapter<String>
{
    private String[] name;
    private String[] username;
    private String[] password;
    private String[] role;
    private Activity context;

    public RoleList(Activity context, String[] name, String[] username, String[] password, String[] role)
    {
        super(context, R.layout.role_list,name);
        this.context = context;
        this.name = name;
        this.username =username;
        this.password = password;
        this.role = role;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        LayoutInflater inflater = context.getLayoutInflater();
        View listViewItem = inflater.inflate(R.layout.role_list, null, true);
        TextView textViewName = (TextView) listViewItem.findViewById(R.id.tv_empname);
        TextView textViewusername = (TextView) listViewItem.findViewById(R.id.tv_empusername);
        TextView textViewPass = (TextView) listViewItem.findViewById(R.id.tv_emppassword);
        TextView textViewRole = (TextView) listViewItem.findViewById(R.id.tv_emprole);


        textViewName.setText(name[position]);
        textViewusername.setText(username[position]);
        textViewPass.setText(password[position]);
        textViewRole.setText(role[position]);



        return listViewItem;
    }
}

列表的处理程序:-

  public void userRolehandler()
    {
        final Handler handler = new Handler();
        handler.post(new Runnable() {
            @Override
            public void run()
            {
                RoleList roleList = new RoleList(UserRegistration.this,employee_name,emp_username,emp_password,employee_role);

                userList.setAdapter(roleList);
                roleList.notifyDataSetChanged();


            }
        });
    }

//用户角色数组

 public void userRoleArray() throws JSONException {
        name = editTextName.getText().toString();
        username = editTextUsername.getText().toString();
        password = editTextPassword.getText().toString();
        emp_role = textRole.getText().toString();

        JSONObject jsonobj = new JSONObject();
        jsonobj.put("name",name);
        jsonobj.put("username",username);
        jsonobj.put("password",password);
        jsonobj.put("emp_role",emp_role);

        rolejson.put(counter,jsonobj);
        counter++;
    }

//travRoleArray

  public void travRoleArray() throws JSONException {
        response = "{\"result\":" + rolejson.toString() + "}";
        Log.d("RESPONSE",response);
        JSONObject jsonOb = new JSONObject(response);
        JSONArray result = jsonOb.getJSONArray(JSON_ARRAY);
        try
        {
            for (int i=0; i< result.length();i++)
            {
                JSONObject jObj = result.getJSONObject(i);
                employee_name[i] = jObj.getString(KEY_NAME);
                emp_username[i] = jObj.getString(KEY_UNAME);
                emp_password[i] = jObj.getString(KEY_PASS);
                employee_role[i] = jObj.getString(KEY_ROLE);
            }

        }catch (ArrayIndexOutOfBoundsException e)
        {
            Toast.makeText(UserRegistration.this, "Contact customer care for assigning more roles", Toast.LENGTH_LONG).show();
        }

    }

场景:

1. 用户单击添加用户按钮，将打开一个对话框
2. 用户输入必填字段并点击注册
3. 一行被添加到 ListView 中。

屏幕截图: 对话框:

最终屏幕:

现在我想添加两个按钮编辑和删除。为了允许用户可以编辑和删除添加到 ListView 中的行。

Answer 1

最简单的解决方案是您应该更改 String[] name至ArrayList<String> name

public class RoleList extends ArrayAdapter<String>{
     //private String[] name;
     private ArrayList<String> name;      

     // it show how many items are in the data set represented by this Adapter.
     @Override
     public int getCount(){
           return name.size();
     }
}

当前您使用String[] ，并且其大小是固定的

String[] toppings = new String[10];
System.out.println("Hello World"+toppings.length); // will print 10

因此你的ListView始终显示 10 个项目(甚至有些是空的)

但是如果你使用ArrayList<String> ，当您添加或删除项目时，列表的大小会自动更改，然后您的 ListView总行数 = 列表大小

或如果您仍想使用String[]
您可以创建一个新的 int变量如 realTotalFriends (从0开始)并且每次添加新用户时(只需将其增加1)
然后里面getCount()你return realTotalFriends

     int realTotalFriends;
     @Override
     public int getCount(){
           return realTotalFriends;
     }

希望这有帮助