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문자


ContextMenu

版本:Android 2.3 r1

结构

继承关系

public interfaceContextMenuimplementsMenu

android.view.ContextMenu

类概述

扩展自Menu的上下文菜单提供了修改上下文菜单头(header)的功能。(译者注:当一个视图注册了上下文菜单时,执行一个在该对象上长按(2秒)的动作,将出现一个具有相关功能的浮动菜单。)

上下文菜单不支持菜单项的快捷方式和图标。

当执行长按上下文菜单时,大多数情况会调用registerForContextMenu(View)函数和重写执行onCreateContextMenu(ContextMenu, View, ContextMenu.ContextMenuInfo)函数。(译者注:因为要创建一个上下文菜单,你必须重写这个活动的上下文回调函数onCreateContextMenu()并且通过registerForContextMenu(View)为其注册上下文菜单。)

内部类

interface ContextMenu.ContextMenuInfo

获得更多关于创建上下文菜单的信息。(译者注:例如:AdapterViews使用这个类可以精确选择adapter的位置来启动上下文菜单。)

公共方法

public abstract voidclearHeader()

清除上下文菜单头的信息。(译者注:包括图片和文字信息

Menu.clearHeader();

public abstract ContextMenusetHeaderIcon(Drawable icon)

为上下文菜单头设置图标

参数

icon你要使用的Drawable

返回值

调用你设置修改的上下文菜单

public abstract ContextMenusetHeaderIcon(int iconRes)

设置上下文菜单头图标为指定的资源id

参数

iconRes你要使用的图标资源的目录

(译者注:把图标放入res/drawable/目录下,R文件会自动生成对应项。设置方法如menu.setHeaderIcon(R.drawable.webtext)

这个上下文菜单头是没有设置图标的

这个上下文菜单头是设置了图标的

返回值

调用你设置修改过的上下文菜单

public abstract ContextMenusetHeaderTitle(int titleRes)

通过资源标识符为上下文菜单头的标题栏设置文字。(译者注:需要在res/string中先设置一段你需要的文字,如:<stringname="titletest">这是一段测试文字string>

然后通过R文件索引到这段文字,menu.setHeaderTitle(R.string.titletest)

参数

titleRes所需文字资源的索引

返回值

调用你设置修改过的上下文菜单

public abstract ContextMenusetHeaderTitle(CharSequence title)

设置上下文菜单的标题,显示在标题栏

参数

title标题要显示的文字

返回值

调用你设置修改过的上下文菜单

public abstract ContextMenusetHeaderView(View view)

设置View到上下文菜单头上。将替代上下文菜单头的图标和标题(或者替代你之前设置的headerView

参数

view上下文菜单头要使用的View

返回值

调用你设置修改过的上下文菜单内容

补充

文章精选:

Android的上下文菜单:Context Menu

androidContextMenu

android上下文菜单Context Menu

代码示例:

Test_Contextmenu.java

publicclassTest_ContextmenuextendsActivity {

@Override

publicvoidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

TextView txt1 = (TextView)this.findViewById(R.id.txt1);

this.registerForContextMenu(txt1);

TextView txt2 = (TextView)this.findViewById(R.id.txt2);

this.registerForContextMenu(txt2);

}

// 重写 onCreateContextMenu 用以创建上下文菜单

@Override

publicvoidonCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo){

super.onCreateContextMenu(menu, v, menuInfo);

//创建R.id.txt1的上下文菜单

if(v == (TextView)this.findViewById(R.id.txt1)) {

menu.setHeaderIcon(R.drawable.icon);

menu.setHeaderTitle(R.string.titletest);

//menu.clearHeader();

// 第一个参数:组ID

// 第二个参数:菜单项ID

// 第三个参数:顺序号

// 第四个参数:菜单项上显示的内容

menu.add(1,0,0,"菜单1");

menu.add(1,1,1,"菜单2").setCheckable(true);// 增加一个√选项

}

//创建R.id.txt2的上下文菜单(多级)

elseif(v == (TextView)this.findViewById(R.id.txt2)){

// ContextMenu.addSubMenu("菜单名称")- 用来添加子菜单。子菜单其实就是一个特殊的菜单

SubMenu sub1 = menu.addSubMenu("父菜单1");

sub1.setHeaderIcon(R.drawable.folder);

sub1.add(0, 0, 0,"菜单1");

sub1.add(0, 1, 1,"菜单2");

sub1.setGroupCheckable(1,true,true);

SubMenu sub2 = menu.addSubMenu("父菜单2");

sub2.setIcon(R.drawable.text);

sub2.add(1, 0, 0,"菜单3");

sub2.add(1, 1, 1,"菜单4");

sub2.setGroupCheckable(1,true,true);

}

}

}

main.xml

xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:id="@+id/txt1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="(txt1)"

/>

<TextView

android:id="@+id/txt2"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="(txt2)"

/>

LinearLayout>

strings.xml

xmlversion="1.0"encoding="utf-8"?>

<resources>

<stringname="hello">Hello World, Test_Contextmenu!string>

<stringname="app_name">Test_Contextmenustring>

<stringname="titletest">这是一段测试文字string>

resources>


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