阅读《Android 从入门到精通》（26）——上下文菜单
16lz
2021-01-23
上下文菜单（ContextMenu）
上下文菜单不同于 Windows 菜单，需要长按才能出现子菜单。
ContextMenu 类方法
ContextMenu 示例
完整工程：http://download.csdn.net/detail/sweetloveft/9435611
1.MainActivity.java
package com.sweetlover.activity;import com.sweetlover.contextmenu.R;import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.SubMenu;import android.view.View;import android.widget.TextView;public class MainActivity extends Activity {private TextView tv1 = null;private TextView tv2 = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv1 = (TextView)findViewById(R.id.textView1);tv2 = (TextView)findViewById(R.id.textView2);// 将控件注册到上下文之中registerForContextMenu(tv1);registerForContextMenu(tv2);}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {// TODO Auto-generated method stubsuper.onCreateContextMenu(menu, v, menuInfo);if (v == tv1) {menu.setHeaderIcon(R.drawable.miku);menu.setHeaderTitle("我的菜单");menu.add(1, 0, 0, "菜单1");menu.add(1, 1, 1, "菜单2");for (int i = 3; i < 8; i++)menu.add(1, 1, 2, "菜单" + i);} else if (v == tv2) {SubMenu[] subMenu = new SubMenu[6];subMenu[0] = menu.addSubMenu("二级菜单1");subMenu[0].setHeaderIcon(R.drawable.miku);subMenu[0].add(0, 0, 0, "二级菜单1/菜单1");subMenu[0].add(0, 1, 1, "二级彩单1/菜单2");subMenu[0].setGroupCheckable(1, true, true);// 设置整个组可选subMenu[1] = menu.addSubMenu("二级菜单2");subMenu[1].setHeaderIcon(R.drawable.miku);subMenu[1].add(1, 0, 0, "二级菜单2/菜单1");subMenu[1].add(1, 1, 1, "二级彩单2/菜单2");subMenu[1].setGroupCheckable(1, true, true);// 设置整个组可选subMenu[2] = menu.addSubMenu("二级菜单3");subMenu[2].setHeaderIcon(R.drawable.miku);subMenu[2].add(1, 0, 0, "二级菜单3/菜单1");subMenu[2].add(1, 1, 1, "二级彩单3/菜单2");subMenu[2].setGroupCheckable(1, true, true);// 设置整个组可选subMenu[3] = menu.addSubMenu("二级菜单4");subMenu[3].setHeaderIcon(R.drawable.miku);subMenu[3].add(1, 0, 0, "二级菜单4/菜单1");subMenu[3].add(1, 1, 1, "二级彩单4/菜单2");subMenu[3].setGroupCheckable(1, true, true);// 设置整个组可选subMenu[4] = menu.addSubMenu("二级菜单5");subMenu[4].setHeaderIcon(R.drawable.miku);subMenu[4].add(1, 0, 0, "二级菜单5/菜单1");subMenu[4].add(1, 1, 1, "二级彩单5/菜单2");subMenu[4].setGroupCheckable(1, true, true);// 设置整个组可选subMenu[5] = menu.addSubMenu("二级菜单6");subMenu[5].setHeaderIcon(R.drawable.miku);subMenu[5].add(1, 0, 0, "二级菜单6/菜单1");subMenu[5].add(1, 1, 1, "二级彩单6/菜单2");subMenu[5].setGroupCheckable(1, true, true);// 设置整个组可选}}} 2.activity_main.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="@string/note" android:textAppearance="?android:attr/textAppearanceMedium" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/item1" android:textAppearance="?android:attr/textAppearanceMedium" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/item2" android:textAppearance="?android:attr/textAppearanceMedium" /></LinearLayout>
3.string.xml
<resources> <string name="app_name">ContextMenu</string> <string name="note">长时间按住显示菜单</string> <string name="item1">主菜单1</string> <string name="item2">主菜单2</string></resources>
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