Using Android AutoCompleteTextView with ArrayAdapter instead of ArrayAdapter

问题

I wanted to use AutoCompleteTextView in my android application.I know how to use it with simple array of Strings, but I wanted AutoCompleteTextView to use list of Objects to perform completion.My code for this is following:

ACTIVITY CODE

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
}

Student class Object has information regarding a student which is ID,NAME,ADDRESS,MARKS.

I know AutoCompleteTextView needs an array of String type object to perform search operation.In my case I want AutoCompleteTextView to use my ArrayList to perform completion on the basis of Student object field NAME.I dont know how should I specify AutoCompleteTextView to use NAME field of Student object.Please help me providing any Link or a small example.

Thanks

回答1:

Two ways:

Override toString() in Student class and make it return name. You can get the object that was selected with the following code:

 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();
    }
});

Implement a custom adapter (by extending BaseAdapter class or ArrayAdapter<Student> class) Check this tutorial : http://www.ezzylearning.com/tutorial.aspx?tid=1763429

回答2:

You can use an AbstractList to get the String representation of each item in your object list.

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));
}

回答3:

if you are wanna add the data in String[] arr=new String[100]; then its wrong. You can do the same work as in form of ArrayList but remember you will never put here a Getter/Setter class. Just simply declare it. See this example.

Declare in main partition:

 ArrayList<String>arr=new ArrayList<>();

and then initilize it in this way:

 for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject1 = (JSONObject) jsonArray.get(i);
                    String imei = jsonObject1.getString("imei");
                    String name = jsonObject1.getString("name");
                    String my_pic = jsonObject1.getString("my_pic");
                    String email = jsonObject1.getString("email");

                    arr.add(name);
                }


                adapter= new ArrayAdapter<>
                        (this, android.R.layout.select_dialog_item, arr);
                autoCompleteText.setThreshold(1);//will start working from first character
                autoCompleteText.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
                autoCompleteText.setTextColor(Color.RED);


            }

I hope this will work for you....

来源：https://stackoverflow.com/questions/13063849/using-android-autocompletetextview-with-arrayadapterobjects-instead-of-arrayad

标签

android