Adapter, GridView와 ListView 적용법

1. List VIew

public class MainActivity extends Activity implements AdapterView.OnItemClickListener {
 
    ListView lv;
    TextView tv;
    ArrayAdapter<String> adapter;
    String[] list = {"Apple", "Orange", "Melon", "Lemon"};
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        lv = (ListView) findViewById(R.id.listview);
        tv = (TextView) findViewById(R.id.textview);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
        lv.setAdapter(adapter);
        lv.setOnItemClickListener(this);
    }
 
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String fruit = list[position];
        tv.setText(fruit);
   }

2. GridView

GridView
public class MainActivity extends AppCompatActivity {
    List<String> cityNames;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        cityNames = new ArrayList<String>();               // 데이터 준비
        cityNames.add("서울특별시");
        cityNames.add("부산광역시");
        cityNames.add("대구광역시");
        cityNames.add("인천광역시");
        ListAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, cityNames);                      // 어댑터를 생성
        GridView gridView = (GridView) findViewById(R.id.gridView);                 // 어댑터를 설정
        gridView.setAdapter(adapter);
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {                                   // 항목 클릭시 위치값과 지역명 토스트로 출력
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                TextView tv = (TextView) view.findViewById(android.R.id.text1);
                Toast.makeText(MainActivity.this, position + ", " + tv.getText(), Toast.LENGTH_SHORT).show();
            }
        });
    }
}