AutoCompleteTextView与MultiAutoCompleteTextView的区别

这两个控件都可以在输入的时候进行提醒，差别在于MultiAutoCompleteTextView可以在输入框一直增加新的选择值，其编写方式也有些不同，一定要setTokenizer，否则会出错。见代码

package sucre.android;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
/**
 * AutoCompleteTextView与MultiAutoCompleteTextView
 * @author qiaolei
 *
 */
public class EX04_13 extends Activity {
    /** Called when the activity is first created. */
    private static final String[] autoStr = new String[]{"a","abc","abcd","abcde"};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,autoStr);
        /*AutoCompleteTextView myAutoCompleteTextView = (AutoCompleteTextView)findViewById(R.id.myAutoCompleteTextView);
        myAutoCompleteTextView.setAdapter(adapter);*/
        MultiAutoCompleteTextView ad = (MultiAutoCompleteTextView)findViewById(R.id.myMultiAutoCompleteTextView);
        ad.setAdapter(adapter);
        ad.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }
}

代码中的CommaTokenizer类，结果会将原本选择框里的值往后加逗号及空白。