Android组件 子菜单(SubMenu)
16lz
2021-01-24
注意:可以在Menu上添加子菜单(SubMenu),但子菜单不能再嵌套子菜单,即意味着Android中菜单只有两层,这是项目设计时需要注意的。
Java示例代码如下:
package com.demo.android.submenu;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.widget.Toast;public class SubMenuActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {super.onCreateOptionsMenu(menu);SubMenu fileMenu=menu.addSubMenu(1, 1, 1, "File");//fileMenu.setHeaderTitle("File");fileMenu.add(2, 11, 11, "New");fileMenu.add(2, 12, 12, "Save");fileMenu.add(2, 13, 13, "Close");SubMenu editMenu=menu.addSubMenu(1, 2, 2, "Edit");//editMenu.setIcon(icon)//editMenu.setHeaderTitle("");editMenu.add(2, 21, 21, "Redo");editMenu.add(2, 22, 22, "Undo");return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {super.onOptionsItemSelected(item);switch(item.getItemId()){case 1:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 2:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 11:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 12:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 13:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 21:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}case 22:{Toast.makeText(SubMenuActivity.this, "单击了"+item.getTitle(), Toast.LENGTH_SHORT).show();break;}}return true;}}
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