第二章实例：Android窗口菜单显示

package test.main.cls;import com.example.popupwindow.R;import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.Gravity;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.Button;import android.widget.PopupMenu;import android.widget.PopupMenu.OnMenuItemClickListener;import android.widget.PopupWindow;import android.widget.Toast;public class PopupWindows extends Activity {    @Override    public void onCreateContextMenu(ContextMenu menu, View v,            ContextMenuInfo menuInfo) {        menu.setHeaderIcon(R.drawable.ic_launcher);        SubMenu submenu = menu.addSubMenu("系统修复");//该方法返回submenu接口对象，想必menu实现了submenu接口        submenu.add(0, 0, 0, "自动修复").setIcon(R.drawable.ic_launcher);        submenu.add(0, 1, 0, "修复外存").setIcon(R.drawable.ic_launcher);        submenu.add(0, 2, 0, "修复硬件").setIcon(R.drawable.ic_launcher);        //------------------------------------------        menu.setHeaderIcon(R.drawable.ic_launcher);        SubMenu submenus = menu.addSubMenu("全局修复");//该方法返回submenu接口对象，想必menu实现了submenu接口        submenus.add(0, 0, 0, "完全修复").setIcon(R.drawable.ic_launcher);        submenus.add(0, 1, 0, "无损修复").setIcon(R.drawable.ic_launcher);        submenus.add(0, 2, 0, "完美修复").setIcon(R.drawable.ic_launcher);        super.onCreateContextMenu(menu, v, menuInfo);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        SubMenu submenu = menu.addSubMenu("毁灭系统");//该方法返回submenu接口对象，想必menu实现了submenu接口        submenu.add(0, 0, 0, "全盘毁灭").setIcon(R.drawable.ic_launcher);        submenu.add(0, 1, 0, "毁灭外存").setIcon(R.drawable.ic_launcher);        submenu.add(0, 2, 0, "毁灭硬件").setIcon(R.drawable.ic_launcher);        //submenu.add(0, 4, 0, "毁灭电池").setIcon(R.drawable.ic_launcher).setIntent(/*Intent*/);        //submenu.add(0, 3, 0, "毁灭屏幕").setShortcut('F', '5');        //submenu.setGroupCheckable(0, true, true);按钮组是否可勾选        //-----------------------------------------        SubMenu submenu1 = menu.addSubMenu("发送诈骗信息");        submenu1.add(0, 0, 0, "发送给全部好友");        submenu1.add(0, 1, 0, "发送给最近联系");        submenu1.add(0, 2, 0, "随机发送");        submenu1.add(0, 3, 0, "发送国外");                return super.onCreateOptionsMenu(menu);    }    @Override    public void onOptionsMenuClosed(Menu menu) {        // TODO Auto-generated method stub        super.onOptionsMenuClosed(menu);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        View contentv = this.getLayoutInflater().inflate(R.layout.main_layout, null);        this.setContentView(contentv);        //-------------------------------------------        Button btn = (Button)findViewById(R.id.clickssss);        final PopupMenu pMenu = new PopupMenu(PopupWindows.this,btn);        this.getMenuInflater().inflate(R.menu.popup_menu, pMenu.getMenu());        btn.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                pMenu.show();            }        });        pMenu.setOnMenuItemClickListener(new OnMenuItemClickListener() {                        @Override            public boolean onMenuItemClick(MenuItem item) {                Toast.makeText(PopupWindows.this, item.getTitle(), Toast.LENGTH_LONG).show();                return true;            }        });        ///------------------------------------------        //注意：：findViewById需要setContentView后可用        this.registerForContextMenu(contentv);//给一个View绑定上下文菜单            }}

xml:
//main_layout<?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" >    <Button         android:id="@+id/clickssss"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="弹出"/></LinearLayout>

xml://menu/popup_menu.xml<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android" >    <group android:checkableBehavior="none">        <item android:id="@+id/menu_1"            android:title="这是一个弹出菜单"/>        <item android:id="@+id/menu_2"            android:title="其用法也非常简单"/>        <item android:id="@+id/menu_3"            android:title="控件使用不是重点"/>        <item android:id="@+id/menu_4"            android:title="重点是要理解代码"/>                 </group></menu>

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