安卓——OptionsMenus实现选项菜单

Dear 丶 2022-05-29 12:29 262阅读 0赞

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activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.lenovo.optionmenuedemo.MainActivity">
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    
    </android.support.constraint.ConstraintLayout>

activity\_layout.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="这是第二个界面"
            />
    </LinearLayout>

menu文件夹下的main.xml，这是用xml来创建菜单选项用的

MainActivity.java

package com.example.lenovo.optionmenuedemo;
    
    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
    
        /*
        创建菜单选项
         */
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            //return super.onCreateOptionsMenu(menu);
            //getMenuInflater().inflate(R.menu.main,menu);//使用xml文件创建菜单项
            menu.add(1,100,1,"菜单一");
            //add()方法返回一个item，通过这个将菜单二的标题改一下
           MenuItem item= menu.add(1,101,1,"菜单二");
           item.setTitle("aaa");
           item.setIcon(R.mipmap.ic_launcher);//api>=11不显示
            menu.add(1,102,1,"菜单三");
            menu.add(1,103,1,"菜单四");
            menu.add(1,104,1,"菜单五");
            menu.add(1,105,1,"菜单六");
            menu.add(1,106,1,"菜单七");
            menu.add(1,107,1,"菜单八");
            return true;
        }
    
        /*
        设置菜单点击事件
         */
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            switch(item.getItemId())
            {
                case 100:
                    Toast.makeText(MainActivity.this,"点击了菜单一",Toast.LENGTH_SHORT).show();
                    break;
                case 101:
                    //Toast.makeText(MainActivity.this,"点击了菜单二",Toast.LENGTH_SHORT).show();
                    //点击菜单二，跳转到别的界面
                    Intent intent=new Intent(MainActivity.this,SecondActivity.class);
                    startActivity(intent);
                  //  item.setIntent(intent);//奇怪，这个方法不起作用
                    break;
                case 102:
                    Toast.makeText(MainActivity.this,"点击了菜单三",Toast.LENGTH_SHORT).show();
                    break;
                case 103:
                    Toast.makeText(MainActivity.this,"点击了菜单四",Toast.LENGTH_SHORT).show();
                    break;
                case 104:
                    Toast.makeText(MainActivity.this,"点击了菜单五",Toast.LENGTH_SHORT).show();
                    break;
                case 105:
                    Toast.makeText(MainActivity.this,"点击了菜单六",Toast.LENGTH_SHORT).show();
                    break;
                case 106:
                    Toast.makeText(MainActivity.this,"点击了菜单七",Toast.LENGTH_SHORT).show();
                    break;
                case 107:
                    Toast.makeText(MainActivity.this,"点击了菜单八",Toast.LENGTH_SHORT).show();
                    break;
            }
    
    
            return true;
        }
    }

SecondActivity.java

package com.example.lenovo.optionmenuedemo;
    
    import android.app.Activity;
    import android.os.Bundle;
    
    /**
     * Created by lenovo on 2018/3/23.
     */
    
    public class SecondActivity extends Activity {
    
        @Override
        protected void onCreate( Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_layout);
        }
    }

[70]: /images/20220529/2dbffc5487db42408aa6bb9260f24914.png
[70 1]: /images/20220529/11a9474060e749bf8d08ed021b1baa6b.png
[70 2]: /images/20220529/9aec8c05e13e45968c9dfea44759c25f.png
[70 3]: https://img-blog.csdn.net/20180323205927446?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODE5OTc3MA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 4]: /images/20220529/8a3490423bbe4d179037a44cc1004cc7.png