Android开警告对话框默认情况下选中的项 [英] android get alert dialog default selected item

问题描述

我有在设置警报对话框的默认选择的项目有点问题。以下是我在我的code使用：

I have a little problem with setting the default selected item in Alert Dialog. Here is what I use in my code :

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，我现在的问题是我设置所选项目根据一些计算，如果我不选择任何东西，preSS确定，不管我已经在默认情况下它再次创建对话框中选择项目，因为这是主意，如果用户没有选择任何内容。我试着设置项目选择=; 或选择=项目; ，但它不工作。我知道我的问题是合乎逻辑的，但我不能弄明白。任何建议如何得到的东西的工作？

So my problem now is I set the selected item depending on some calculations and if i don't select anything and press OK, no matter that I have selected item by default it's creating the dialog again, because that's the idea if user didn't select anything. I've tried to set item=selected; or selected=item; but it's not working. I know my problem is logical , but I can't figure it out. Any suggestions how to get the things to work?

推荐答案

您只需把code，设置在连接到NegativeButton的onClickHandler您storagePath：

You can just put the code that sets your storagePath in the onClickHandler attached to the NegativeButton:

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();
        }
        });

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