Android的DialogActivity如何实现多选和单选功能

要实现多选和单选功能，可以使用AlertDialog.Builder类来创建一个对话框并设置多选和单选选项。以下是一个示例代码：

1. 单选功能：

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("选择一个选项");
final String[] items = {"选项1", "选项2", "选项3"};

builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 点击选项时的操作
        Toast.makeText(DialogActivity.this, "你选择了：" + items[which], Toast.LENGTH_SHORT).show();
        dialog.dismiss();
    }
});

builder.create().show();

2. 多选功能：

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("选择多个选项");
final String[] items = {"选项1", "选项2", "选项3"};
final boolean[] checkedItems = {false, false, false};

builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
        // 多选项点击时的操作
        checkedItems[which] = isChecked;
    }
});

builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 点击确定按钮时的操作
        StringBuilder selectedItems = new StringBuilder();
        for (int i = 0; i < items.length; i++) {
            if (checkedItems[i]) {
                selectedItems.append(items[i]).append(" ");
            }
        }
        Toast.makeText(DialogActivity.this, "你选择了：" + selectedItems.toString(), Toast.LENGTH_SHORT).show();
        dialog.dismiss();
    }
});

builder.create().show();

通过以上代码示例，可以实现在DialogActivity中实现多选和单选功能。