1. Demo.java

public class Demo extends AppCompatActivity {    private static final String DATA[] = new String[] {          "hello","hello ok","hello nihao","hello waitting","hello banana"  //自动提示信息    };    private AutoCompleteTextView myauto = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_progress_activity_demo);        ArrayAdapter
    
      adapter = new ArrayAdapter
     
      (this,                android.R.layout.simple_dropdown_item_1line,DATA);        this.myauto = (AutoCompleteTextView)super.findViewById(R.id.myauto);        this.myauto.setAdapter(adapter);    }}
     
    

2.  activity_demo.xml  自动填充文本