Android 显示一个单选列表对话框（还可利用二维数组配对数据）

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显示一个单选列表对话框

一、先丢代码，方便“面向搜索引擎编程”的同志们

  1. 不考虑 item 和 value 的配对的情况下（很简单的啦）： 
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    new AlertDialog.Builder(context)
      .setTitle(R.string.title)
      .setSingleChoiceItems(
          R.array.items,    // 显示的每行的内容
          checkedItem,      // 已选中的项（ -1 均不选中）
          (dialog, which) -> {
              checkedItem = which;  // 保存选中的项的在 R.array.items 中所处的位置（从 0 开始）
              dialog.dismiss();
          }
      )
      .setNegativeButton(android.R.string.cancel, null)  // “取消”按钮
      .show();
  2. item 和 value 配对的情况下（实现中利用了一个二维数组，或许还有更好的方案）： 
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    // 此例中 Items 和 Values 的内容是按顺序一一对应的
    String[][] keyValuePair = {
        getResources().getStringArray(R.array.items),  // Items
        getResources().getStringArray(R.array.values)  // Values
    };

    new AlertDialog.Builder(context)
        .setTitle(R.string.title)
        .setSingleChoiceItems(
            keyValuePair[0],              // 显示的每行的内容
            checkedKeyValuePairPosition,  // 已选中的项的位置（ -1 均不选中）
            (dialog, which) -> {
                checkedKeyValuePairPosition = which;  // 保存选中的项所处的位置（从 0 开始）
                checkedKeyValuePairValue =
                    keyValuePair[1][which];           // 保存选中的项对应的 Value
                dialog.dismiss();
            }
        )
        .setNegativeButton(R.string.cancel, null)     // “取消”按钮
        .show();

二、builder 里提供的 setSingleChoiceItems 目前看是有四种，可以按需使用。上方的代码只用了其中一种，使用方式区别不大，靠官方文档的注释应该就足够了。这里略微带过几小段：

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/**
 * Set a list of items to be displayed in the dialog as the content, you will be notified of
 * the selected item via the supplied listener. This should be an array type i.e.
 * R.array.foo The list will have a check mark displayed to the right of the text for the
 * checked item. Clicking on an item in the list will not dismiss the dialog. Clicking on a
 * button will dismiss the dialog.
 *
 * @param itemsId the resource id of an array i.e. R.array.foo
 * @param checkedItem specifies which item is checked. If -1 no items are checked.
 * @param listener notified when an item on the list is clicked. The dialog will not be
 *        dismissed when an item is clicked. It will only be dismissed if clicked on a
 *        button, if no buttons are supplied it's up to the user to dismiss the dialog.
 *
 * @return This Builder object to allow for chaining of calls to set methods
 */
public Builder setSingleChoiceItems(@ArrayRes int itemsId, int checkedItem,
        final OnClickListener listener)
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/**
 * Set a list of items to be displayed in the dialog as the content, you will be notified of
 * the selected item via the supplied listener. The list will have a check mark displayed to
 * the right of the text for the checked item. Clicking on an item in the list will not
 * dismiss the dialog. Clicking on a button will dismiss the dialog.
 *
 * @param cursor the cursor to retrieve the items from.
 * @param checkedItem specifies which item is checked. If -1 no items are checked.
 * @param labelColumn The column name on the cursor containing the string to display in the
 *        label.
 * @param listener notified when an item on the list is clicked. The dialog will not be
 *        dismissed when an item is clicked. It will only be dismissed if clicked on a
 *        button, if no buttons are supplied it's up to the user to dismiss the dialog.
 *
 * @return This Builder object to allow for chaining of calls to set methods
 */
public Builder setSingleChoiceItems(Cursor cursor, int checkedItem, String labelColumn,
        final OnClickListener listener)
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/**
 * Set a list of items to be displayed in the dialog as the content, you will be notified of
 * the selected item via the supplied listener. The list will have a check mark displayed to
 * the right of the text for the checked item. Clicking on an item in the list will not
 * dismiss the dialog. Clicking on a button will dismiss the dialog.
 *
 * @param items the items to be displayed.
 * @param checkedItem specifies which item is checked. If -1 no items are checked.
 * @param listener notified when an item on the list is clicked. The dialog will not be
 *        dismissed when an item is clicked. It will only be dismissed if clicked on a
 *        button, if no buttons are supplied it's up to the user to dismiss the dialog.
 *
 * @return This Builder object to allow for chaining of calls to set methods
 */
public Builder setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener) 
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/**
 * Set a list of items to be displayed in the dialog as the content, you will be notified of
 * the selected item via the supplied listener. The list will have a check mark displayed to
 * the right of the text for the checked item. Clicking on an item in the list will not
 * dismiss the dialog. Clicking on a button will dismiss the dialog.
 *
 * @param adapter The {@link ListAdapter} to supply the list of items
 * @param checkedItem specifies which item is checked. If -1 no items are checked.
 * @param listener notified when an item on the list is clicked. The dialog will not be
 *        dismissed when an item is clicked. It will only be dismissed if clicked on a
 *        button, if no buttons are supplied it's up to the user to dismiss the dialog.
 *
 * @return This Builder object to allow for chaining of calls to set methods
 */
public Builder setSingleChoiceItems(ListAdapter adapter, int checkedItem, final OnClickListener listener)

三、更多

如果需要多选的话，setMultiChoiceItems 拿来用就行了。