Android AlertDialog 不显示单选按钮或消息

Question

在我的应用程序中，我在 ListActivity 中长按时会弹出一个上下文菜单。 “优先级”选项之一会弹出一个带有 3 个单选按钮选项的 AlertDialog。问题是，它显示一个空对话框，没有我的 3 个选择，也没有我设置的消息。这是我的代码。

protected Dialog onCreateDialog(int id) {
    AlertDialog dialog;
    switch(id) {
    case DIALOG_SAB_PRIORITY_ID:
        final CharSequence[] items = {"High", "Normal", "Low"};

        AlertDialog.Builder builder = new AlertDialog.Builder(SabMgmt.this);
        builder.setMessage("Select new priority")
               .setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {
                Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
            }
        });

        dialog = builder.create();            
        break;
    default:
        dialog = null;
    }
    return dialog;
}

如果我用肯定和否定按钮替换 .setSingleChoiceItems，它将按预期显示按钮和消息。我在设置单选按钮列表时做错了什么？这也是我的调用代码..

public boolean onContextItemSelected(MenuItem item) {
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
    switch (item.getItemId()) {
    case R.id.sabdelete:
        // Correct position (-1) for 1 header
        final SabQueueItem qItem = (SabQueueItem) itla.getItem(info.position-1);
        SabNZBdUtils.deleteItem(qItem.getNzo_id());
        getQueue();
        ListView lv = getListView();
        View v = lv.findViewById(R.id.sablistheader);
        setHeader(v);
        itla.notifyDataSetChanged();
        return true;
    case R.id.sabpriority:
        showDialog(DIALOG_SAB_PRIORITY_ID);
        return true;
    default:
        return super.onContextItemSelected(item);
    }
}

Answer 1

想通了！我在 singleChoiceItem 对话框上使用 builder.setMessage 而不是 builder.setTitle。使用单选按钮选择的对话框似乎不支持设置消息，仅支持标题。不过提供该方法似乎很奇怪。无论如何，这是工作代码..

protected Dialog onCreateDialog(int id) {
    AlertDialog dialog;
    switch(id) {
    case DIALOG_SAB_PRIORITY_ID:
        final CharSequence[] items = {"High", "Normal", "Low"};

        AlertDialog.Builder builder = new AlertDialog.Builder(SabMgmt.this);
        builder.setTitle("Select new priority")
               .setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {
                Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
            }
        });

        dialog = builder.create();  
        break;
    default:
        dialog = null;
    }
    return dialog;