UI Android

package app.test;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.EditText;
import android.widget.MultiAutoCompleteTextView;
import android.widget.TextView;
public class Test extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        TextView tv =(TextView)findViewById(R.id.tv);
        EditText et = (EditText)findViewById(R.id.et);
        AutoCompleteTextView actv = (AutoCompleteTextView)findViewById(R.id.actv);
        ArrayAdapter aa = new ArrayAdapter(this,
                        android.R.layout.simple_dropdown_item_1line,
                        new String[] {"English", "Hebrew", "Hindi", "Spanish", "German", "Greek" });
        actv.setAdapter(aa);
        
        MultiAutoCompleteTextView mactv = (MultiAutoCompleteTextView)findViewById(R.id.mactv);
        ArrayAdapter aa2 = new ArrayAdapter(this,
                android.R.layout.simple_dropdown_item_1line,
                new String[] {"English", "Hebrew", "Hindi", "Spanish", "German", "Greek" });
        mactv.setAdapter(aa2);
        mactv.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }
}