Android实现搜索功能 AutoCompleteTextView和MultiAutoCompleteTextView的用法

private AutoCompleteTextView acCompleteTextView;
private MultiAutoCompleteTextView mactv;
private String[] str = {"beijing","beijing tiananmen", "shanghai", "shanghai dongfangmingzhu", "lanzhou", "lanzhouzhongshanqiao", "lanzhou wuquanshan"};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
acCompleteTextView = (AutoCompleteTextView) this.findViewById(R.id.acTextView);
mactv = (MultiAutoCompleteTextView) this.findViewById(R.id.mactv);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,str);
acCompleteTextView.setAdapter(adapter);

mactv.setAdapter(adapter);
/* 设置逗号为分隔符 */
mactv.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}

<AutoCompleteTextView
android:id="@+id/acTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="2"
android:hint="@string/content" />

<MultiAutoCompleteTextView
android:id="@+id/mactv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/content"
android:completionThreshold="2"/>

completionThreshold 属性的意思是从第几个字符开始自动匹配，我设置成了从第二个字符开始自动匹配。