Question

我在Stackoverflow上找到了如何使用复选框创建警告对话框。它工作得很好。我的问题是，我如何检查哪些复选框被选中？我使用复选框来设置正在保存的文本文件的文件名。

final CharSequence[] items = {" Custom/Default Filename ", "With Date&Time "," With this device's model "};
// arraylist to keep the selected items
final ArrayList seletedItems=new ArrayList();

AlertDialog dialog2 = new AlertDialog.Builder(Settings.this)
    .setTitle("Select, what export file's name contains")
    .setMultiChoiceItems(items, null, new DialogInterface.OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int indexSelected, boolean isChecked) {
            if (isChecked) {
                // If the user checked the item, add it to the selected items
                // write your code when user checked the checkbox
                seletedItems.add(indexSelected);
            } else if (seletedItems.contains(indexSelected)) {
                  // Else, if the item is already in the array, remove it 
                  // write your code when user Uchecked the checkbox
                  seletedItems.remove(Integer.valueOf(indexSelected));
              }
           }
       }).setPositiveButton("OK", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int id) {
                  // What I should to in this step, to detect which checkboxes are checked and which are not? That's my problem.                 
                  //  Your code when user clicked on OK
                  //  You can write the code  to save the selected item here
              }
          }).create();
     dialog2.show();

Answer 1

不使用通用列表，而是使用布尔值列表并在ischecked中存储

final List<Boolean> seletedItems = Arrays.asList(false,false,false)
// or final List<Boolean> seletedItems = new ArrayList<>();
// for(int i =0;i<items.length;i++){seletedItems.add(false);}

并将数据存储为相应的索引

public void onClick(DialogInterface dialog, int indexSelected, boolean isChecked) {
        seletedItems.set(indexSelected,isChecked);
  // add boolean check at the particular position 
}

注意：列表的大小等于根据位置保持选择的数组大小

假设，用户选择0,2，然后seletedItems将

index      value
 0          true
 1          false
 2          true

您也可以使用boolean数组来提高效率

如何检查哪些复选框被选中以及哪些复选框没有？

1 个答案: