Android:AutoCompleteTextView和MultiAutoCompleteTextView及逗号分隔问题

分类： Android android实例 2011-08-11 19:13 919人阅读评论(1) 收藏举报 android layout dropdown string encoding listview

1、在布局文件当中声明一个AutoCompleteTextView

main.xml代码：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Country" />
<AutoCompleteTextView android:id="@+id/autocomplete"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"/>
LinearLayout>

2、在res/layout下面创建一个新的布局文件：list_item.xml(定义下拉菜单中的条目的显示布局)

list_item.xml文件：

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<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="16sp"
android:textColor="#000">
TextView>

3、 AutoCompleteTextView需要使用ArrayAdapter来提供数据；

数据来源有两种方式：

1、在程序中动态获取：可以是数组；

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public class MainActivity extends Activity {
/** Called when the activity is first created. */
AutoCompleteTextView autoCompleteTextView = null;
static final String[] COUNTRIES = new String[] {
"Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra",
"Angola", "Anguilla", "Antarctica", "Antigua and Barbuda", "Argentina"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//通过ID得到AutoCompleteTextView对象
autoCompleteTextView = (AutoCompleteTextView)findViewById(R.id.autocomplete);
//创建一个list，为ArrayAdapter提供数据
List list = new ArrayList();
list.add("测试测试");
list.add("测试test");
//创建一个ArrayAdapter对象
ArrayAdapter arrayAdapter = new ArrayAdapter(this,R.layout.list_item,list);
//将ArrayAdapter设置给AutoCompleteTextView对象
autoCompleteTextView.setAdapter(arrayAdapter);
}
}

2、在string.xml中定义；

string.xml文件：

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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="countries_array">
<item>Bahrainitem>
<item>Bangladeshitem>
<item>Barbadositem>
<item>Belarusitem>
<item>Belgiumitem>
<item>Belizeitem>
<item>Beninitem>
string-array>
resources>

在程序中获取数据资源：

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String[] countries = getResources().getStringArray(R.array.countries_array);
ArrayAdapter adapter = new ArrayAdapter(this, R.layout.list_item, countries);

在许多的控件中，都是用Adapter进行数据填充，如SimpleAdapter（ListView）,ArrayAdapter等……

这样在输入框输入数据的时候自动填充；

如果我们要在输入提示的时候能进行多重提示，就需要用到它的子类MultiAutoCompleteTextView具体用法很简单只是添加了一个叫分离器的东西，代码如：

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public class AutocompleteActivity extends Activity {
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_dropdown_item_1line, COUNTRIES);
MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.edit);
textView.setAdapter(adapter);
textView.setThreshold(1);
textView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}
private static final String[] COUNTRIES = new String[] {
"Belgium", "France", "Italy", "Germany", "Spain"
};
}

这样写的话，系统默认分隔是逗号，并且在逗号后面还有一个空格，很难发现，如果不想用默认逗号和空格进行分割，这里需要重写MultiAutoCompleteTextView的子类CommaTokenizer，并实现接口Tokenizer（分离器），完整代码如下：

[java] view plain copy

public class AutocompleteActivity extends Activity {
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_dropdown_item_1line, COUNTRIES);
MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.edit);
textView.setAdapter(adapter);
textView.setThreshold(1);
textView.setTokenizer(new CommaTokenizer());
}
private static final String[] COUNTRIES = new String[] {
"Belgium", "France", "Italy", "Germany", "Spain","Spain2"
};
public class CommaTokenizer implements Tokenizer{
/**
* 在文本框中每输入任何一个字符都会调用这个方法，返回的是每一个单词输入的开始位置（从0开始），cursor是最后面的之字符位置。
*/
public int findTokenStart(CharSequence text, int cursor) {
int i = cursor;
System.out.println("findTokenStart---"+text+"---cursor:"+cursor);
while (i > 0 && text.charAt(i - 1) != ',') {
i--;
}
while (i < cursor && text.charAt(i) == ' ') {
i++;
}
System.out.println(i);
return i;
}
public int findTokenEnd(CharSequence text, int cursor) {
int i = cursor;
int len = text.length();
System.out.println("findTokenEnd---"+text+"---cursor:"+cursor);
while (i < len) {
if (text.charAt(i) == ',') {
return i;
} else {
i++;
}
}
return len;
}
/**
* 只有当回车结束输入的时候，才会调用些方法。返回完整的字符串
*/
public CharSequence terminateToken(CharSequence text) {
int i = text.length();
System.out.println("terminateToken---"+text);
while (i > 0 && text.charAt(i - 1) == ' ') {
i--;
}
if (i > 0 && text.charAt(i - 1) == ',') {
return text;
} else {
if (text instanceof Spanned) {
SpannableString sp = new SpannableString(text + ", ");
TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
Object.class, sp, 0);
return sp;
} else {
return text + ", ";
}
}
}
}
}

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