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MiNotes/src/main/java/net/micode/notes/ui/DropdownMenu.java

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package net.micode.notes.ui;
import android.content.Context;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;
import net.micode.notes.R;
/**
* @Package: net.micode.notes.ui
* @ClassName: DropdownMenu
* @Description:
* DropdownMenu是一个自定义下拉菜单控件。
* 它使用Button作为触发器通过PopupMenu显示菜单选项。
* 构造函数接收一个上下文环境、一个Button和菜单资源的ID。
* 通过setOnDropdownMenuItemClickListener方法设置菜单选项的点击监听器。
* 可以通过findItem方法查找特定的菜单选项。
* 通过setTitle方法设置下拉菜单的标题
* @Author: YangYizhe
* @CreateDate: 12/21/2023 12:36 AM
* @Version: 1.0
*/
public class DropdownMenu {
private Button mButton;
private PopupMenu mPopupMenu;
//声明一个下拉菜单
private Menu mMenu;
public DropdownMenu(Context context, Button button, int menuId) {
mButton = button;
mButton.setBackgroundResource(R.drawable.dropdown_icon);
//设置这个view的背景
mPopupMenu = new PopupMenu(context, mButton);
mMenu = mPopupMenu.getMenu();
mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
//MenuInflater是用来实例化Menu目录下的Menu布局文件
//根据ID来确认menu的内容选项
mButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPopupMenu.show();
}
});
}
public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
if (mPopupMenu != null) {
mPopupMenu.setOnMenuItemClickListener(listener);
}
}
public MenuItem findItem(int id) {
return mMenu.findItem(id);
}//对于菜单选项的初始化,根据索引搜索菜单需要的选项
public void setTitle(CharSequence title) {
mButton.setText(title);
}//布局文件,设置标题
}