子菜单案例

拼搏现实的明天。 2024-03-30 10:23 62阅读 0赞

**目录**

基于Empty Activity模板创建安卓应用SubMenuDemo

编辑 将图片素材拷贝到drawable目录

打开字符串资源文件 strings.xml输入代码

打开主布局资源文件 activity\_main.xml输入代码：

打开主界面类 MainActivity输入代码：

启动应用查看效果：

--------------------

#### 基于`Empty Activity`模板创建安卓应用`SubMenuDemo` ####

![5e0602d7a2ac4bb4a0f39a00aa3cff7d.png][]

#### ![6849a88b035c46b1ba3ee4b4d48f483b.png][] 将图片素材拷贝到`drawable`目录 ####

![b62156a5b1db4551bb9b001bd3de006f.png][]

#### 打开字符串资源文件 `strings.xml输入代码` ####

![9f756ed21ce2499f8ade9f15e2f7fbb5.png][]

具体代码：

<resources>
        <string name="app_name">子菜单演示</string>
    </resources>

#### 打开主布局资源文件 `activity_main.xml输入代码：` ####

![83069e770c86462f93f40116f69bb0bd.png][]

具体代码：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/root"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/background"
        android:orientation="vertical"
        tools:context=".MainActivity">
    
    </LinearLayout>

#### 打开主界面类 `MainActivity输入代码：` ####

![ea87d545fbc449c68a63bccd45cb5dee.png][]

![44e3db29cd3a4d43be835b54851244d0.png][]

具体代码：

package net.zyt.sub_menu;
    
    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.graphics.Color;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.SubMenu;
    import android.widget.LinearLayout;
    
    public class MainActivity extends AppCompatActivity {
        private LinearLayout root;//线性根部局
        private static final int SET_COLOR_MENU=1;//设置颜色菜单
        private static final int RED_MENU_ITEM=11;//红色背景菜单项
        private static final int GREEN_MENU_ITEM=12;//绿色背景菜单项
        private static final int BLUE_MENU_ITEM=13;//蓝色背景菜单项
    
        private static final int SET_BACKGROUND_MENU=2;//设置背景图片菜单
        private static final int SCENERY_MENU_ITEM=21;//24节气图片
        private static final int BUILDING_MENU_ITEM=22;//动漫图片
        private static final int PERSON_MENU_ITEM=23;//银杏叶图片
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //通过布局资源文件设置用户界面
            setContentView(R.layout.activity_main);
            //通过资源标识符获取控件实例
            root=findViewById(R.id.root);
    
        }
    //创建选项菜单及其子菜单
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
    //创建设置背景颜色子菜单
            SubMenu setBackgroundColorSubMenu=menu.addSubMenu(1,SET_BACKGROUND_MENU,1,"设置背景颜色");
            //给子菜单添加菜单项
            setBackgroundColorSubMenu.add(1,RED_MENU_ITEM,1,"红色");
            setBackgroundColorSubMenu.add(1,GREEN_MENU_ITEM,2,"绿色");
            setBackgroundColorSubMenu.add(1,BLUE_MENU_ITEM,3,"蓝色");
            //创建设置背景图片菜单及其子菜单
            SubMenu setBackgroundImageSubMenu=menu.addSubMenu(2,SET_BACKGROUND_MENU,2,"设置背景图片");
            //给子菜单添加菜单项
            setBackgroundImageSubMenu.add(2,SCENERY_MENU_ITEM,1,"24节气");
            setBackgroundImageSubMenu.add(2,BUILDING_MENU_ITEM,2,"动漫");
            setBackgroundImageSubMenu.add(2,PERSON_MENU_ITEM,3,"银杏叶");
            return true;
        }
        //菜单项选择事件处理方法
        @Override
        public boolean onOptionsItemSelected(@NonNull MenuItem item){
            switch (item.getItemId()){
                case RED_MENU_ITEM://设置红色背景
                    root.setBackgroundColor(Color.RED);
                    break;
                case GREEN_MENU_ITEM:
                    root.setBackgroundColor(Color.GREEN);
                    break;
                case BLUE_MENU_ITEM:
                    root.setBackgroundColor(Color.BLUE);
                    break;
                case SCENERY_MENU_ITEM:
                    root.setBackgroundResource(R.drawable.scenery);
                    break;
                case BUILDING_MENU_ITEM:
                    root.setBackgroundResource(R.drawable.building);
                    break;
                case PERSON_MENU_ITEM:
                    root.setBackgroundResource(R.drawable.person);
                    break;
    
            }
            return true;
        }
    }

#### 启动应用查看效果： ####

![e76e62f252bc4c48984f9d57020ce19a.gif][]

[5e0602d7a2ac4bb4a0f39a00aa3cff7d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/225c217e820b4d35af033ade9d6dee79.png
[6849a88b035c46b1ba3ee4b4d48f483b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/ca607e9c51804f0481d18cc08e445bf5.png
[b62156a5b1db4551bb9b001bd3de006f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/1db48a5760624b3a804f6c0e990f5b6a.png
[9f756ed21ce2499f8ade9f15e2f7fbb5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/e9a5a583aedc44a9b2a860156d200431.png
[83069e770c86462f93f40116f69bb0bd.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/286a22e4ada3484aaa8cc5cb09b27dc1.png
[ea87d545fbc449c68a63bccd45cb5dee.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/8244ae99f2e44d20834fb07c780d92b8.png
[44e3db29cd3a4d43be835b54851244d0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/cd026d5fb47f434cb898683d052f992e.png
[e76e62f252bc4c48984f9d57020ce19a.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/c3f1423a8b79465080ca1536ec03cdff.gif