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。