Android:Dialog Builder多选设置数组

Question

我正在尝试按照Android文档关于多个选择对话框.我有一个问题,我认为这是我正在尝试加载的数组类型.

public void addCondition(View view){

         ArrayList<String> mHelperNames= new ArrayList<String>();
           mHelperNames.add("Test Item");
           mHelperNames.add("Test Item");
           mHelperNames.add("Test Item");


           mSelectedItems = new ArrayList();  

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("My Title")
                   .setMultiChoiceItems(mHelperNames, null,
                              new DialogInterface.OnMultiChoiceClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int which,
                               boolean isChecked) {
                           if (isChecked) {

                               mSelectedItems.add(which);
                           } else if (mSelectedItems.contains(which)) {

                               mSelectedItems.remove(Integer.valueOf(which));
                           }
                       }
                   })

                   .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int id) {
                            //Create onlcick method
                       }
                   })
                   .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int id) {
                            //Create onlcick method
                       }
                   });
            builder.show();

    }

上面是我的代码,但它是eclipse中的红线城市:

在文档中,mSelectedItems永远不会被声明,我不太确定我将其声明为什么.

.SetMultipleChoiceItems上的错误是:

AlertDialog.Builder类型中的方法setMultiChoiceItems(int,boolean [],DialogInterface.OnMultiChoiceClickListener)不适用于参数(ArrayList,null,new DialogInterface.OnMultiChoiceClickListener(){})

但是,如果我从字符串中更改它,如何在其中显示文本项？任何帮助将非常感激.

汤姆

Answer 1

你必须提供CharSequence[]给setMultiChoiceItems方法,而不是一个ArrayList.

你可以mHelperNames像这样创建:

CharSequence[] mHelperNames = new CharSequence[] { "test item 1", "test item 2" };

别忘了宣布mSelectedItems:

final List<Integer> mSelectedItems = new ArrayList<Integer>(); 

(它必须是最终的,因为你从内部类访问它)

mHelperNames如果需要稍后修改,也可以保留为ArrayList.然后你需要在调用时将它转换为数组setMultiChoiceItems:

    List<CharSequence> mHelperNames = new ArrayList<CharSequence>();
    mHelperNames.add("Test Item 1");
    mHelperNames.add("Test Item 2");

    final List<Integer> mSelectedItems = new ArrayList<Integer>();

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("My Title")
            .setMultiChoiceItems(mHelperNames.toArray(new CharSequence[mHelperNames.size()]), null,
                    new DialogInterface.OnMultiChoiceClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog,
                                int which, boolean isChecked) {
                            if (isChecked) {

                                mSelectedItems.add(which);
                            } else if (mSelectedItems.contains(which)) {

                                mSelectedItems.remove(Integer
                                        .valueOf(which));
                            }
                        }
                    })