Android—菜单

layout文件：

 <?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:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.hanqi.testapp2.TestActivity3"
     android:orientation="vertical">

     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="按钮"
         android:id="@+id/bt_1"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="上下文菜单按钮"
         android:id="@+id/bt_2"/>
 </LinearLayout>

java类代码（bt_1代码可不看，bt_2代码为菜单属性相关）：

 package com.hanqi.testapp2;

 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.ContextMenu;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.SubMenu;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;

 public class TestActivity3 extends AppCompatActivity {

     Button bt_1;
     Button bt_2;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_test3);
         bt_1 = (Button)findViewById(R.id.bt_1);
         bt_2 = (Button)findViewById(R.id.bt_2);

         //给组件添加上下文菜单  Activity是OnCreateContextMenuListener的实现类
         bt_2.setOnCreateContextMenuListener(this);

         //添加长按监听器
 //        bt_2.setOnLongClickListener(new View.OnLongClickListener() {
 //            @Override
 //            public boolean onLongClick(View v) {
 //                Toast.makeText(TestActivity3.this, "按钮被长按了", Toast.LENGTH_SHORT).show();
 //                return true;//后面不再被处理
 //            }
 //        });
         //点击
         bt_1.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Toast.makeText(TestActivity3.this, "按钮被点击了", Toast.LENGTH_SHORT).show();
             }
         });
         //长按
         bt_1.setOnLongClickListener(new View.OnLongClickListener() {
             @Override
             public boolean onLongClick(View v) {
                 Toast.makeText(TestActivity3.this, "按钮被长按了", Toast.LENGTH_SHORT).show();
                 //事件是否已被消费
                 return true;
             }
         });

     }

     //重写创建上下文菜单方法
     @Override
     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
         super.onCreateContextMenu(menu, v, menuInfo);
         //java代码的方式
         menu.add(1,0,0, "字体大小");
         menu.add(1, 1, 1, "背景颜色");

         //添加子菜单
         SubMenu sm = menu.addSubMenu(1, 2, 3, "子菜单");
         sm.add(2,21,0,"子菜单1");
         sm.add(2,22,0,"子菜单2");
         //加载文件的方式
         MenuInflater m = getMenuInflater();
         m.inflate(R.menu.test3_menu, menu);
     }

     @Override
     public boolean onContextItemSelected(MenuItem item) {
         Toast.makeText(TestActivity3.this, "上下文菜单的title = "+item.getTitle(), Toast.LENGTH_SHORT).show();
         return super.onContextItemSelected(item);
     }

     //给activity天津选项菜单
     //重写
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         //添加菜单
 //        menu.add(1,1,0,"添加");
 //        menu.add(1,2,2,"修改");
 //        menu.add(1,3,1,"删除");

         //加载菜单文件的方式
         //1-活动菜单加载器
         MenuInflater m = getMenuInflater();
         //2-加载菜单文件  1）菜单文件 2）当前菜单
         m.inflate(R.menu.test3_menu,menu);
         return super.onCreateOptionsMenu(menu);
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
 //        Toast.makeText(TestActivity3.this, "菜单项的id = "+item.getItemId()+
 //                "菜单项的title = "+item.getTitle(), Toast.LENGTH_SHORT).show();

         //怎么判断菜单文件里的菜单哪个被选中了
         if(item.getItemId() == R.id.me_1)
         {
             Toast.makeText(TestActivity3.this, "执行删除动作", Toast.LENGTH_SHORT).show();
         }
         else if(item.getItemId() == R.id.me_2)
         {
             Toast.makeText(TestActivity3.this, "执行修改动作", Toast.LENGTH_SHORT).show();
         }
         return super.onOptionsItemSelected(item);
     }
 }

效果图为：

附相关思维导图：