public class MainActivity extends AppCompatActivity {
// 模拟actv这个控件要显示的数据
private String[] COUNTRIES = new String[] { "laofang", "laoli", "laozhang", "laobi", "laowang","aa","abb","ccc"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//1 找到控件
AutoCompleteTextView actv = (AutoCompleteTextView) findViewById(R.id.actv);
//2 actv这个控件显示数据的原理和listview一样，需要一个数据适配器
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, COUNTRIES);
//3 显示数据
actv.setAdapter(adapter);
}
}
