Android—菜单

layout文件：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hanqi.testapp2.TestActivity3"
11     android:orientation="vertical">
12 
13     <Button
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:text="按钮"
17         android:id="@+id/bt_1"/>
18     <Button
19         android:layout_width="match_parent"
20         android:layout_height="wrap_content"
21         android:text="上下文菜单按钮"
22         android:id="@+id/bt_2"/>
23 </LinearLayout>

java类代码（bt_1代码可不看，bt_2代码为菜单属性相关）：

  1 package com.hanqi.testapp2;
  2 
  3 import android.support.v7.app.AppCompatActivity;
  4 import android.os.Bundle;
  5 import android.view.ContextMenu;
  6 import android.view.Menu;
  7 import android.view.MenuInflater;
  8 import android.view.MenuItem;
  9 import android.view.SubMenu;
 10 import android.view.View;
 11 import android.widget.Button;
 12 import android.widget.Toast;
 13 
 14 public class TestActivity3 extends AppCompatActivity {
 15 
 16     Button bt_1;
 17     Button bt_2;
 18     @Override
 19     protected void onCreate(Bundle savedInstanceState) {
 20         super.onCreate(savedInstanceState);
 21         setContentView(R.layout.activity_test3);
 22         bt_1 = (Button)findViewById(R.id.bt_1);
 23         bt_2 = (Button)findViewById(R.id.bt_2);
 24 
 25         //给组件添加上下文菜单  Activity是OnCreateContextMenuListener的实现类
 26         bt_2.setOnCreateContextMenuListener(this);
 27 
 28         //添加长按监听器
 29 //        bt_2.setOnLongClickListener(new View.OnLongClickListener() {
 30 //            @Override
 31 //            public boolean onLongClick(View v) {
 32 //                Toast.makeText(TestActivity3.this, "按钮被长按了", Toast.LENGTH_SHORT).show();
 33 //                return true;//后面不再被处理
 34 //            }
 35 //        });
 36         //点击
 37         bt_1.setOnClickListener(new View.OnClickListener() {
 38             @Override
 39             public void onClick(View v) {
 40                 Toast.makeText(TestActivity3.this, "按钮被点击了", Toast.LENGTH_SHORT).show();
 41             }
 42         });
 43         //长按
 44         bt_1.setOnLongClickListener(new View.OnLongClickListener() {
 45             @Override
 46             public boolean onLongClick(View v) {
 47                 Toast.makeText(TestActivity3.this, "按钮被长按了", Toast.LENGTH_SHORT).show();
 48                 //事件是否已被消费
 49                 return true;
 50             }
 51         });
 52 
 53     }
 54 
 55     //重写创建上下文菜单方法
 56     @Override
 57     public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
 58         super.onCreateContextMenu(menu, v, menuInfo);
 59         //java代码的方式
 60         menu.add(1,0,0, "字体大小");
 61         menu.add(1, 1, 1, "背景颜色");
 62 
 63         //添加子菜单
 64         SubMenu sm = menu.addSubMenu(1, 2, 3, "子菜单");
 65         sm.add(2,21,0,"子菜单1");
 66         sm.add(2,22,0,"子菜单2");
 67         //加载文件的方式
 68         MenuInflater m = getMenuInflater();
 69         m.inflate(R.menu.test3_menu, menu);
 70     }
 71 
 72     @Override
 73     public boolean onContextItemSelected(MenuItem item) {
 74         Toast.makeText(TestActivity3.this, "上下文菜单的title = "+item.getTitle(), Toast.LENGTH_SHORT).show();
 75         return super.onContextItemSelected(item);
 76     }
 77 
 78     //给activity天津选项菜单
 79     //重写
 80     @Override
 81     public boolean onCreateOptionsMenu(Menu menu) {
 82         //添加菜单
 83 //        menu.add(1,1,0,"添加");
 84 //        menu.add(1,2,2,"修改");
 85 //        menu.add(1,3,1,"删除");
 86 
 87         //加载菜单文件的方式
 88         //1-活动菜单加载器
 89         MenuInflater m = getMenuInflater();
 90         //2-加载菜单文件  1）菜单文件 2）当前菜单
 91         m.inflate(R.menu.test3_menu,menu);
 92         return super.onCreateOptionsMenu(menu);
 93     }
 94 
 95     @Override
 96     public boolean onOptionsItemSelected(MenuItem item) {
 97 //        Toast.makeText(TestActivity3.this, "菜单项的id = "+item.getItemId()+
 98 //                "菜单项的title = "+item.getTitle(), Toast.LENGTH_SHORT).show();
 99 
100         //怎么判断菜单文件里的菜单哪个被选中了
101         if(item.getItemId() == R.id.me_1)
102         {
103             Toast.makeText(TestActivity3.this, "执行删除动作", Toast.LENGTH_SHORT).show();
104         }
105         else if(item.getItemId() == R.id.me_2)
106         {
107             Toast.makeText(TestActivity3.this, "执行修改动作", Toast.LENGTH_SHORT).show();
108         }
109         return super.onOptionsItemSelected(item);
110     }
111 }

效果图为：

附相关思维导图：