使用Android AutoCompleteTextView和ArrayAdapter <Objects>而不是ArrayAdapter <Strings>

Question

我想在我的android应用程序中使用AutoCompleteTextView.我知道如何使用简单的字符串数组,但我希望AutoCompleteTextView使用对象列表来执行完成.我的代码如下:

活动代码

public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.search);

        initialize();
        ArrayAdapter<Student> adapter = new ArrayAdapter<Student>(this,
                R.layout.dropdown_list_item, GetAllStudentsList());

        searchBox.setAdapter(adapter);
        searchBox.setThreshold(THRESHOLD_VALUE);
        searchBox.setTextColor(Color.BLACK);
}

searchBox.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> adapterView, View view,
                int position, long arg3) {
                     //Here i will grab the Student object that user selected from drop-down

        }

    });

public ArrayList<Movies> GetAllStudentsList() {

//This method returns a ArrayList of <Student> type objects
}

学生班对象有关于学生的信息ID,NAME,ADDRESS,MARKS.

我知道AutoCompleteTextView需要一个String类型对象的数组来执行搜索操作.在我的情况下,我希望AutoCompleteTextView使用我的ArrayList在Student对象字段NAME的基础上执行完成.我不知道如何指定AutoCompleteTextView使用NAME字段学生对象.请帮我提供任何链接或一个小例子.

谢谢

Answer 1

两种方式:

1. toString()在Student类中重写并使其返回name.您可以使用以下代码获取所选对象:

    public static class Student {
   
       private String name;
   
           public Student(String name) {
               this.name = name;
           }
   
           @Override
           public String toString() {
               return name;
           }
   
       }
   
   AutoCompleteTextView tv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
   final ArrayList<Student> list = new ArrayList<MainActivity.Student>();
   list.add(new Student("Viru"));
   list.add(new Student("Gauti"));
   ArrayAdapter<Student> adapter = new ArrayAdapter<MainActivity.Student>(
           this, android.R.layout.simple_dropdown_item_1line, list);
   tv.setAdapter(adapter);
   
   tv.setOnItemClickListener(new OnItemClickListener() {
   
       @Override
       public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
               long arg3) {
           Student selected = (Student) arg0.getAdapter().getItem(arg2);
           Toast.makeText(MainActivity.this,
                   "Clicked " + arg2 + " name: " + selected.name,
                   Toast.LENGTH_SHORT).show();
       }
   });
   

2. 实现自定义适配器(通过扩展BaseAdapter类或ArrayAdapter<Student>类)检查本教程:http://www.ezzylearning.com/tutorial.aspx？tid = 1763429

Answer 2

您可以使用 anAbstractList来获取String对象列表中每个项目的表示。

private void setupAutoComplete(AutoCompleteTextView view, List<T> objects) {
    List<String> names = new AbstractList<String>() {
        @Override
        public int size() { return objects.size(); }

        @Override
        public String get(int location) {
            return objects.get(location).getName();
        }
    };

    view.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, names));
}