anks anks - 5 months ago 17
Android Question

Using Android AutoCompleteTextView with ArrayAdapter<Objects> instead of ArrayAdapter<Strings>

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

Answer

Two ways:

  1. 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();
        }
    });
    
  2. Implement a custom adapter (by extending BaseAdapter class or ArrayAdapter<Student> class) Check this tutorial : http://www.ezzylearning.com/tutorial.aspx?tid=1763429