Android List BaseAdapter

BaseAdapter

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListView lv = findViewById(R.id.lv);
        lv.setAdapter(new MyListAdapter()); // 设置 数据适配器
    }
    
	// 实现 BaseAdapter 方法
    private class MyListAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return 4;
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView tv;
            if (convertView == null) {
                tv = new TextView(MainActivity.this);
            } 
            else {
                tv = (TextView) convertView;
            }
            tv.setText("索引：" + position);
            return tv;
        }
    }
}