创建选项菜单

谁借莪１个温暖的怀抱￠ 2024-03-30 10:23 72阅读 0赞

**目录**

创建安卓应用

将背景图片拷贝到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

打开主界面类 MainActivity输入代码

启动应用查看效果：

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

#### 创建安卓应用 ####

基于`Empty Activity`模板创建安卓应用 `OptionsMenuDemo`

![724ef2643ba64062b5fe8a3f947f9d1f.png][]

#### 将背景图片拷贝到drawable目录 ####

![fce2c6c8415f4b55a47f123ebe120fa2.png][]

#### 打开字符串资源文件 `strings.xml输入代码：` ####

![76854b7b157049aaabc135111600d2dc.png][]

#### 打开主布局资源文件`activity_main.xml` ####

![3efc816ac9f449c1b84f5e84666fd309.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:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/background"
    
        tools:context=".MainActivity">
    
    
    
    
    </LinearLayout>

#### 打开主界面类 `MainActivity`输入代码 ####

![4168234d6fd74d5d9892fda70ce840cb.png][]

具体代码：

package net.zyt.optionsmenudemo;
    
    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.Toast;
    import android.widget.Toolbar;
    
    public class MainActivity extends AppCompatActivity {
        private static final int NEW_FILE_MENU=1;//新建文件菜单标识
        private static final int OPEN_FILE_MENU=2;//打开文件菜单标识
        private static final int SAVE_FILE_MENU=3;//保存文件菜单标识
        private static final int EXIT_FILE_MENU=4;//退出文件菜单标识
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
        }
    //创建选项菜单
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu){
            menu.add(1,NEW_FILE_MENU,1,"新建文件");
            menu.add(1,OPEN_FILE_MENU,2,"打开文件");
            menu.add(1,SAVE_FILE_MENU,3,"保存文件");
            menu.add(1,EXIT_FILE_MENU,4,"退出文件");
            return  true;
        }
        @Override
        public boolean onOptionsItemSelected(@NonNull MenuItem item){
            switch (item.getItemId()){
                case NEW_FILE_MENU:
                    Toast.makeText(this,"你单击了【新建文件】菜单项~",Toast.LENGTH_SHORT).show();
                    break;
                    case OPEN_FILE_MENU:
                    Toast.makeText(this,"你单击了【打开文件】菜单项~",Toast.LENGTH_SHORT).show();
                    break;
                case SAVE_FILE_MENU:
                    Toast.makeText(this,"你单击了【保存文件】菜单项~",Toast.LENGTH_SHORT).show();
                    break;
                case EXIT_FILE_MENU:
                    finish();
                    break;
            }
            return true;
        }
    }

#### 启动应用查看效果： ####

![4d6f1c0324b54bc38a324de14ddc511d.png][]

[724ef2643ba64062b5fe8a3f947f9d1f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/57074be1818940e59fe646ca15f6a97a.png
[fce2c6c8415f4b55a47f123ebe120fa2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/0e0ceb37f21e41e79cc4471254eceb08.png
[76854b7b157049aaabc135111600d2dc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/dbd322bea37a41dd9fef1231826aaead.png
[3efc816ac9f449c1b84f5e84666fd309.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/b6c4e97235b24264b6beb6815aa68104.png
[4168234d6fd74d5d9892fda70ce840cb.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/bf7fbf5b9be046419652efb04b51f986.png
[4d6f1c0324b54bc38a324de14ddc511d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/84fd24a3bd894bcd9953d5abd0126c8f.png