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

androidlayoutdropdownstringencodinglistview

 

1、在布局文件当中声明一个AutoCompleteTextView

main.xml代码：

 

<?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：

 

<?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；

 

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<String> list = new ArrayList<String>();
        list.add("测试测试");
        list.add("测试test");
        //创建一个ArrayAdapter对象
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(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：

 

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="countries_array">
        <item>Bahrain</item>
        <item>Bangladesh</item>
        <item>Barbados</item>
        <item>Belarus</item>
        <item>Belgium</item>
        <item>Belize</item>
        <item>Benin</item>
    </string-array>
</resources>

在程序中获取数据资源：

 

 

String[] countries = getResources().getStringArray(R.array.countries_array);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(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：

 

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<String> adapter = new ArrayAdapter<String>(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：

 

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<String> adapter = new ArrayAdapter<String>(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 + ", ";
                }
            }
        }
    }
}