Question

我在“警报”对话框中设置默认选定项目时遇到一些问题。这是我在代码中使用的内容：

if(memory>megAvailable){
        selected = 0;
    } else if(megAvailable>memory){
        selected = 1;
    }

    AlertDialog.Builder builder = new AlertDialog.Builder(this.getParent());
    builder.setTitle("Select Storage Path");
    builder.setSingleChoiceItems(items, selected, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {

            if(item == 0){
                rpc.createFoldersInInternalStorage(servername, userId, MyCollectionList.this);
                Toast.makeText(getApplicationContext(), "Selected Storage Path : Phone Memory", Toast.LENGTH_SHORT).show();
                editor.putInt("storagePath", 1);
                editor.commit();
            } else if (item == 1){
                rpc.createFoldersInExternalStorage(servername, userId, MyCollectionList.this);
                Toast.makeText(getApplicationContext(), "Selected Storage Path : SD Card", Toast.LENGTH_SHORT).show();
                editor.putInt("storagePath", 2);
                editor.commit();
            }
        }});

        builder.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
                mHandlerUpdateUi.post(mUpdateUpdateUi);     
        }
        });
        AlertDialog alert = builder.create();

所以现在我的问题是我根据一些计算设置了所选项目，如果我没有选择任何内容并按OK，无论我是否选择了项目，默认它再次创建对话框，因为这是用户的想法没有选择任何东西。我试图设置item=selected;或selected=item;，但它不起作用。我知道我的问题是合乎逻辑的，但我无法弄清楚。有关如何让事情发挥作用的任何建议吗？

Answer 1

您可以将设置storagePath的代码放在附加到NegativeButton的onClickHandler中：

final int defaultSelected = selected +1; //this is final since you need to access it in the anonymous inner class; we're adding 1 since your value that you write seems to be either 1 or 2.
 builder.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
                mHandlerUpdateUi.post(mUpdateUpdateUi);     
                editor.putInt("storagePath", defaultSelected);
                editor.commit();
        }
        });

android get alert对话框默认选中的项目

1 个答案: