android - 如何在 ActionBarSherlock 导航微调器中包装文本内容

Question

我正在尝试包装 ActionBar 导航微调器的文本内容(我正在使用 ActionBar Sherlock)。似乎我的微调器采用了下拉列表中包含的项目的宽度。

如何使微调器中的选定项目根据其宽度“包裹”？在 GMaps 操作栏微调器中可以找到一个示例。

Answer 1

更新:

在这里下载我的示例项目:Spinner width test (Dropbox folder)(它包含此答案中提供的两种解决方案)。

由于字符的字距调整(字母间距)因文本而异，因此微调器的宽度也改变了我之前发布的答案的宽度(下)

因此，不要对标题进行子字符串化，只需像这样设置 TextView 的像素宽度:

textView.setWidth(200);

• 文本现在将被截断并以“..”结尾。

• 微调器的宽度保持不变。

• 您可以为下拉列表和微调器设置不同的宽度

• 您仍然需要自定义 SpinnerAdapter，但您不需要自定义
  SpinnerItem 类，给适配器一个 String[] 数组就可以了。

spinner.setAdapter(new TruncatedSpinnerAdapter(stringArray));//String[]

在 TruncatedSpinnerAdapter 中:

public class TruncatedSpinnerAdapter implements SpinnerAdapter {

    String[] spinnerItem;

    public TruncatedSpinnerAdapter(String[] spinnerItem) {
        this.spinnerItem = spinnerItem;
    }

//    ...more required interface callbacks here...

    /**
     * Returns the View that is shown when a spinner item is selected.
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = getLayoutInflater().inflate(
                android.R.layout.simple_spinner_item, null);
        TextView textView = (TextView) view.findViewById(android.R.id.text1);
        textView.setText(spinnerItem[position]);
        //Set the width of the TextView in pixel. 
        //the text will now get truncated and ending with ".."
        textView.setWidth(200);
        return textView;
    }

更新前的答案:

您可以通过创建自定义 SpinnerAdapter 来包装文本，您可以在其中控制在微调器 View 和微调器下拉 View 中显示的文本的长度。

 /**
     * A SpinnerItemAdapter to handle SpinnerItem Objects, 
     * displays the ArrayList of SpinnerItem Objects.
     */
    public class SpinnerItemAdapter implements SpinnerAdapter{

        /**
         * The internal data, ArrayList of SpinnerItem Objects.
         */
        SparseArray<SpinnerItem> spinnerItem;

        public SpinnerItemAdapter(SparseArray<SpinnerItem> spinnerItem){
            this.spinnerItem = spinnerItem;
        }

        /**
         * Returns the Size
         */
        @Override
        public int getCount() {
            return spinnerItem.size();
        }
        /**
         * Returns a SpinnerItem Object at the specified position.
         */
        @Override
        public Object getItem(int position) {
            return spinnerItem.valueAt(position);
        }


//    ...more required interface callbacks here...


        /**
         * Views displayed when the Spinner is clicked, the drop 
         * down list of spinner items.
         */
        @Override
        public View getDropDownView(int position, View convertView,
                ViewGroup parent) {
            View view=getLayoutInflater().inflate(android.R.layout.simple_spinner_dropdown_item, null); 
            TextView v=(TextView)view.findViewById(android.R.id.text1);
            v.setText(spinnerItem.valueAt(position).getDropDownTitle());     
            return v;
        }
        /**
         * Returns the View that is shown when a spinner item is selected.
         */
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view=getLayoutInflater().inflate(android.R.layout.simple_spinner_item, null); 
            TextView v=(TextView)view.findViewById(android.R.id.text1);
            v.setText(spinnerItem.valueAt(position).getShortTitle());   
            return v;
        }

    }

使用自定义 SpinnerItem 类填充适配器，该类可以保存并返回微调器 View 的缩短标题。

class SpinnerItem {

    // SpinnerItem fields, including variable of type SpinnerItem
    public String title = "";
    // sets the width of the spinnerItem
    public int titleLength = 10;//default value
    public int titleDropDownLength = 20;

    public long id;

    // SpinnerItem methods()

    /**
     * Title with max characters displayed, set by titleLength;
     * 
     * @return title of the spinnerItem.
     */
    public CharSequence getShortTitle() {
        if (title.length() == 0)
            return "?";//
        else if (title.length() > 0 && title.length() <= titleLength) {
            return title;
        } else {
            String shortTile = title.substring(0, titleLength).trim() + "..";
            return shortTile;
        }
    }

    public CharSequence getDropDownTitle() {
        if (title.length() == 0)
            return "?";//
        else if (title.length() > 0 && title.length() <= titleDropDownLength) {
            return title;
        } else {
            String shortTile = title.substring(0, titleDropDownLength).trim() + "..";
            return shortTile;
        }
    }
}

使用 SpinnerItem 类，您可以在创建 SpinnerItem 对象时通过设置最大标题长度来控制微调项 View 中显示的标题长度。

//Create an ArrayList for the Adapter with SpinnerItems
        SparseArray<SpinnerItem> spinnerItems = new SparseArray<SpinnerItem>();

        //Some dummy Cheese titles for the spinner items
        String[] sCheeseStrings = {
               "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
               "Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale"};

        for (int i = 0; i < sCheeseStrings.length; i++) {
            SpinnerItem spinnerItem= new SpinnerItem(); 
            spinnerItem.title=sCheeseStrings[i];
            spinnerItem.id=i;
            spinnerItem.titleLength=MAX_TITLE_LENGTH;
            spinnerItem.titleDropDownLength=MAX_DROP_DOWN_TITLE_LENGTH;
            spinnerItems.append(i, spinnerItem);
        }
        spinnerAdapter = new SpinnerItemAdapter(spinnerItems);

然后将spinnerAdapter添加到Spinner中

spinner.setAdapter(spinnerAdapter);

ActionBar:menu.xml 示例中的 Spinner

        // For API below 11 use ActionBar Sherlock with Android Support Library
//       getSupportMenuInflater().inflate(R.menu.activity_menu, menu);
        // For API above 11
        getMenuInflater().inflate(R.menu.activity_menu, menu);
        spinner_menu = (Spinner) menu.findItem(R.id.menu_spinner).getActionView();
        spinner_menu.setAdapter(spinnerAdapter);