TabHost相信大家都很熟悉，我们经常看到的底部栏就是基于TabHost实现的,也就是常用的选项卡，用来切换不同的Activity，但是怎么去实现弹出菜单呢，又怎么让每个Activity中都能弹出菜单呢，不多说，看代码。
首先我自定义一个BaseActivity，在这里实现对菜单的操作。
1 package com.android;
2 import java.util.ArrayList;
3 import java.util.HashMap;
4
5 import com.android.R;
6 import com.anroid.net.update1;
7 import android.app.Activity;
8 import android.app.AlertDialog;
9 import android.content.DialogInterface;
10 import android.content.DialogInterface.OnKeyListener;
11 import android.content.Intent;
12 import android.os.Bundle;
13 import android.provider.Settings;
14 import android.view.KeyEvent;
15 import android.view.Menu;
16 import android.view.View;
17 import android.widget.AdapterView;
18 import android.widget.GridView;
19 import android.widget.SimpleAdapter;
20 import android.widget.TextView;
21 import android.widget.AdapterView.OnItemClickListener;
22
23 public class BaseActivity extends Activity {
24 protected TextView tv_head;
25 AlertDialog menuDialog;// menu菜单Dialog
26 GridView menuGrid;
27 View menuView;
28 /** 菜单图片 **/
29 int[] menu_image_array = {
30 R.drawable.menu_quit,R.drawable.menu_checkupdate,R.drawable.menu_checknet,R.drawable.menu_about,R.drawable.menu_rename,R.drawable.menu_return
31 };
32 /** 菜单文字 **/
33 String[] menu_name_array = { "退出","检查更新", "设置网络","关于","上传 ","返回" };
34
35 @Override
36 protected void onCreate(Bundle savedInstanceState) {
37 // TODO Auto-generated method stub
38 super.onCreate(savedInstanceState);
39 menuView = View.inflate(this, R.layout.gridview_menu, null);
40 // 创建AlertDialog
41 menuDialog = new AlertDialog.Builder(this).create();
42 menuDialog.setView(menuView);
43 menuDialog.setOnKeyListener(new OnKeyListener() {
44 public boolean onKey(DialogInterface dialog, int keyCode,
45 KeyEvent event) {
46 if (keyCode == KeyEvent.KEYCODE_MENU)// 监听按键
47 dialog.dismiss();
48 return false;
49 }
50 });
51 menuGrid = (GridView) menuView.findViewById(R.id.gridview);
52 menuGrid.setAdapter(getMenuAdapter(menu_name_array, menu_image_array));
53 /** 监听menu选项 **/
54 menuGrid.setOnItemClickListener(new OnItemClickListener() {
55 public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
56 long arg3) {
57 switch (arg2) {
58 case 0:// 退出
59 BaseActivity.this.finish();
60 break;
61 case 1:// 检查更新
62 update1 doup=new update1(getApplicationContext());
63 doup.execute();
64 break;
65 case 2:// 检查网络
66 Intent i2 = new Intent();
67 i2.setAction(Settings.ACTION_WIRELESS_SETTINGS);
68 startActivity(i2);
69 break;
70 case 3:// 关于
71 final Intent i3 = new Intent(getApplicationContext(),About.class);
72 startActivity(i3);
73 menuDialog.dismiss();
74
75 break;
76 case 4:// 上传
77
78 break;
79 case 5:// 返回
80 menuDialog.dismiss();
81 break;
82
83 }
84 }
85 });
86
87 }
88 public boolean onCreateOptionsMenu(Menu menu) {
89 menu.add("menu");// 必须创建一项
90 return super.onCreateOptionsMenu(menu);
91 }
92 private SimpleAdapter getMenuAdapter(String[] menuNameArray,
93 int[] imageResourceArray) {
94 ArrayList<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
95 for (int i = 0; i < menuNameArray.length; i++) {
96 HashMap<String, Object> map = new HashMap<String, Object>();
97 map.put("itemImage", imageResourceArray[i]);
98 map.put("itemText", menuNameArray[i]);
99 data.add(map);
100 }
101 SimpleAdapter simperAdapter = new SimpleAdapter(this, data,
102 R.layout.item_menu, new String[] { "itemImage", "itemText" },
103 new int[] { R.id.item_image, R.id.item_text });
104 return simperAdapter;
105 }
106 @Override
107 public boolean onMenuOpened(int featureId, Menu menu) {
108 if (menuDialog == null) {
109 menuDialog = new AlertDialog.Builder(this).setView(menuView).show();
110 } else {
111 menuDialog.show();
112 }
113 return false;// 返回为true 则显示系统menu
114 }
115
116 @Override
117
118 public boolean onKeyDown(int keyCode, KeyEvent event) {
119 // TODO Auto-generated method stub
120
121 if (keyCode == KeyEvent.KEYCODE_BACK) {
122
123 AlertDialog.Builder builder = new AlertDialog.Builder(getParent());
124 builder.setMessage("你确定退出吗？")
125 .setCancelable(false)
126 .setPositiveButton("确定",
127 new DialogInterface.OnClickListener() {
128 public void onClick(DialogInterface dialog,
129 int id) {
130 finish();
131 System.exit(0);
132 }
133 })
134 .setNegativeButton("返回",
135 new DialogInterface.OnClickListener() {
136 public void onClick(DialogInterface dialog,
137 int id) {
138 dialog.cancel();
139 }
140 });
141 AlertDialog alert = builder.create();
142 alert.show();
143 return true;
144 }
145
146 return super.onKeyDown(keyCode, event);
147 }
148 private void showsetting(){
149
150
151 }
152 }
界面文件；
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<GridView
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="3"
android:verticalSpacing="10dip"
android:horizontalSpacing="10dip"
android:stretchMode="columnWidth"
android:gravity="center"
/>
</LinearLayout>
然后让每个tab的Activity都继承自BaseActiviy，这样就实现了每个Tab中都能弹出菜单。下面贴出怎样创建Tab选项卡。
package com.android;
import com.android.R;
import android.app.TabActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class MainActivity extends TabActivity {
private static TabHost tabHost;private static RadioButton main_tab_myExam;
private static Context context;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
context=this;
main_tab_myExam=(RadioButton) findViewById(R.id.main_tab_myExam);
tabHost=this.getTabHost();
TabHost.TabSpec spec;
Intent intent;
intent=new Intent().setClass(this, Qiu.class);
spec=tabHost.newTabSpec("糗事").setIndicator("糗事").setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this,Dz.class);
spec=tabHost.newTabSpec("笑话").setIndicator("笑话").setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this, New.class);
spec=tabHost.newTabSpec("最新").setIndicator("最新").setContent(intent);
tabHost.addTab(spec);
intent=new Intent().setClass(this, Fa.class);
spec=tabHost.newTabSpec("收藏").setIndicator("收藏").setContent(intent);
tabHost.addTab(spec);
// tabHost.setCurrentTab(1);
RadioGroup radioGroup=(RadioGroup) this.findViewById(R.id.main_tab_group);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch (checkedId) {
case R.id.main_tab_addExam:
tabHost.setCurrentTabByTag("糗事");
break;
case R.id.main_tab_myExam:
tabHost.setCurrentTabByTag("笑话");
break;
case R.id.main_tab_message:
tabHost.setCurrentTabByTag("最新");
break;
case R.id.main_tab_settings:
tabHost.setCurrentTabByTag("收藏");
break;
default:
break;
}
}
});
}
}
然后让这里面的四个Acyivity都继承自BaseActivity就行了。