这两天帮别人做个小玩意，要求由android客户端往指定的wifi路由器上发送指令来控制单片机末端的设备，本来想着在进入客户端后自动连接到指定热点，
这样自动化的用户体验会好些，结果写好了以后人家说不用，就让用户手动连接吧，应为是小活也不是很在意，不过把这段代码共享下吧或者自己以后用的话也方便。
Activity内容如下：
1 package com.shineEye.www;
2
3 import java.util.List;
4
5 import android.Manifest.permission;
6 import android.app.Activity;
7 import android.app.Service;
8 import android.content.BroadcastReceiver;
9 import android.content.Context;
10 import android.content.Intent;
11 import android.content.IntentFilter;
12 import android.net.wifi.ScanResult;
13 import android.net.wifi.WifiConfiguration;
14 import android.net.wifi.WifiInfo;
15 import android.net.wifi.WifiManager;
16 import android.os.Bundle;
17 import android.os.Handler;
18 import android.os.Message;
19 import android.util.Log;
20 import android.view.View;
21 import android.view.View.OnClickListener;
22 import android.widget.Button;
23 import android.widget.Toast;
24
25 /**
26 * @Class Name : WifiAutoConnection.java
27 * @Description WIFI自动连接测试类
28 * @Author YuanLiangFeng 袁良锋 lufengdie@126.com
29 * @Date 2013-4-18 - 上午12:09:44
30 */
31 public class WifiAutoConnection extends Activity implements OnClickListener{
32
33
34 private final String TAG = getClass().getSimpleName();
35 /** 指定热点SSID **/
36 private final String wifiSSID = "\"TP-LINK_585034\"";
37 /** 指定热点名称 **/
38 private final String wifiName = "TP-LINK_585034";
39 /** WIFI管理器 **/
40 private WifiManager wifiManager = null;
41 /** WIFI状态监听广播 **/
42 private BroadcastReceiver receiver;
43 /** 指定热点网络ID **/
44 private int networkId;
45
46 /** 指定热点是否已连接 **/
47 private boolean targetWifiEnable = false;
48
49 /** 打开按钮 **/
50 private Button openLight;
51 /** 关闭按钮 **/
52 private Button closeLight;
53
54
55 @Override
56 protected void onCreate(Bundle savedInstanceState) {
57 super.onCreate(savedInstanceState);
58 setContentView(R.layout.main);
59 initUI();
60 }
61
62 private void initUI(){
63 openLight = (Button) findViewById(R.id.openLight);
64 closeLight = (Button) findViewById(R.id.closeLight);
65 openLight.setOnClickListener(this);
66 closeLight.setOnClickListener(this);
67 }
68
69
70 @Override
71 protected void onResume() {
72 super.onResume();
73 initWifiConnection();
74 }
75
76 private void initWifiConnection(){
77 wifiManager = (WifiManager) getSystemService(Service.WIFI_SERVICE);
78 WifiInfo wifiInfo = wifiManager.getConnectionInfo();
79 if (wifiSSID.equals(wifiInfo.getSSID()) ) {
80 targetWifiEnable = true;
81 return;
82 }
83
84 if (targetWifiIsConfig()) {
85 if (!wifiManager.isWifiEnabled()) {
86 if (wifiManager.setWifiEnabled(true)) {
87 registerWifiChangeBoradCast();
88 }else{
89 showLongToast("wifi开启失败，请手动打开！");
90 Log.d(TAG, "WIFI开启失败");
91 }
92 }else{
93 if (targetWifiCanScan()) {
94 connectionTargetWifi();
95 }
96 }
97 }
98 }
99
100 /**
101 * Description 指定WIFI是否可以被扫描到，即是否在可用范围内
102 * @return true表示可用，否则不可用
103 */
104 private boolean targetWifiCanScan(){
105 List<ScanResult> scanResultList = wifiManager.getScanResults();
106 if (scanResultList != null && scanResultList.size() > 0) {
107 for (int i = 0; i < scanResultList.size(); i++) {
108 ScanResult scanResult = scanResultList.get(i);
109
110 StringBuffer str = new StringBuffer()
111 .append("SSID: " + scanResult.SSID).append("\n")
112 .append("BSSID: " + scanResult.BSSID).append("\n")
113 .append("capabilities: " + scanResult.capabilities).append("\n")
114 .append("level: " + scanResult.level).append("\n")
115 .append("frequency: " + scanResult.frequency);
116 Log.i(TAG, str.toString());
117
118 if (scanResult.SSID.equals(wifiName)) {
119 return true;
120 }
121 }
122 }
123 showLongToast("指定wifi热点暂不可用，稍后可能无法操作照明设备！");
124 return false;
125 }
126
127 /**
128 * Description 指定热点是否已配置(注册)
129 * @return true表示已注册，否则未注册
130 */
131 private boolean targetWifiIsConfig(){
132 List<WifiConfiguration> wifiConfigurationList = wifiManager.getConfiguredNetworks();
133 for (int i = 0; i < wifiConfigurationList.size(); i++) {
134 WifiConfiguration wifiConfiguration = wifiConfigurationList.get(i);
135
136 // StringBuffer str = new StringBuffer()
137 // .append("SSID: " + wifiConfiguration.SSID).append("\n")
138 // .append("status: " + wifiConfiguration.status).append("\n")
139 // .append("networkId: " + wifiConfiguration.networkId).append("\n")
140 // .append("priority: " + wifiConfiguration.priority).append("\n")
141 // .append("wepTxKeyIndex: " + wifiConfiguration.wepTxKeyIndex);
142 // Log.i(TAG, str);
143
144 if (wifiConfiguration.SSID.equals(wifiSSID)) {
145 networkId = wifiConfiguration.networkId;
146 return true;
147 }
148 }
149 showLongToast("指定wifi热点未注册，请在wifi管理中先注册！");
150 return false;
151 }
152
153 /**
154 * Description 连接指定热点
155 * @return
156 */
157 private boolean connectionTargetWifi(){
158 if (wifiManager.enableNetwork(networkId, true)) {
159 targetWifiEnable = true;
160 Log.i(TAG, "热点连接成功");
161 return true;
162 }else{
163 showLongToast("指定wifi热点连接失败，请手动连接！");
164 Log.d(TAG, "热点连接失败");
165 return false;
166 }
167 }
168
169 /**
170 * Description 注册WIFI状态改变监听广播
171 */
172 private void registerWifiChangeBoradCast(){
173 receiver = new BroadcastReceiver() {
174
175 @Override
176 public void onReceive(Context context, Intent intent) {
177 // WIFI可用时连接到指定热点
178 System.out.println(wifiManager.getWifiState());
179 if (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLED) {
180 Log.i(TAG, "WIFI成功开启");
181 unregisterWifiChangeReceiver();
182 handler.sendEmptyMessageDelayed(0, 10 * 1000);
183 }
184 }
185 };
186
187 IntentFilter filter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
188 String broadcastPermission = permission.ACCESS_WIFI_STATE;
189 registerReceiver(receiver, filter, broadcastPermission, new Handler(){
190 @Override
191 public void handleMessage(Message msg) {
192 super.handleMessage(msg);
193 }
194 });
195 }
196
197 /**
198 * Description 注销WIFI状态改变监听广播
199 */
200 private void unregisterWifiChangeReceiver(){
201 if (receiver != null) {
202 unregisterReceiver(receiver);
203 }
204 }
205
206 /**
207 * Description 显示短时长显示的Toast
208 * @param text
209 */
210 @SuppressWarnings("unused")
211 private void showShortToast(String text){
212 Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
213 }
214
215 /**
216 * Description 显示久时长显示的Toast
217 * @param text
218 */
219 private void showLongToast(String text){
220 if (text != null && !"".equals(text)) {
221 Toast.makeText(this, text, Toast.LENGTH_LONG).show();
222 }
223 }
224
225 @Override
226 public void onClick(View v) {
227 switch (v.getId()) {
228
229 case R.id.openLight:
230 if (targetWifiEnable) {
231 showLongToast(HttpHelper.sendCommandToServer("A1"));
232 }else{
233 initWifiConnection();
234 }
235 break;
236
237 case R.id.closeLight:
238 if (targetWifiEnable) {
239 showLongToast(HttpHelper.sendCommandToServer("B1"));
240 }else{
241 initWifiConnection();
242 }
243 break;
244
245 default:
246 break;
247 }
248 }
249
250 private Handler handler = new Handler(){
251 public void handleMessage(Message msg) {
252 if (targetWifiCanScan()) {
253 connectionTargetWifi();
254 }
255 }
256 };
257
258 }
布局文件：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="fill_parent"
5 android:orientation="vertical"
6 android:gravity="center_horizontal"
7 android:padding="20dp">
8
9 <TextView android:layout_width="wrap_content"
10 android:layout_height="wrap_content"
11 android:text="下面两个按钮可以控制序号为1的设备，指令分别为A1和B1.">
12 </TextView>
13
14 <Button android:id="@+id/openLight"
15 android:layout_width="wrap_content"
16 android:layout_height="wrap_content"
17 android:layout_marginTop="50dp"
18 android:text="打开设备">
19 </Button>
20
21 <Button android:id="@+id/closeLight"
22 android:layout_width="wrap_content"
23 android:layout_height="wrap_content"
24 android:layout_marginTop="20dp"
25 android:text="关闭设备">
26 </Button>
27
28 </LinearLayout>
mainfest配置文件：
1 <?xml version="1.0" encoding="utf-8"?>
2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
3 package="com.shineEye.www"
4 android:versionCode="1"
5 android:versionName="1.0" >
6
7 <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="7"/>
8
9
10 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
11 <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
12 <uses-permission android:name="android.permission.INTERNET"/>
13
14
15 <application
16 android:icon="@drawable/ic_launcher"
17 android:label="@string/app_name"
18 android:description="@string/appDescription">
19
20 <activity
21 android:name=".WifiAutoConnection"
22 android:label="@string/app_name"
23 android:theme="@android:style/Theme.Light.NoTitleBar" >
24 <intent-filter>
25 <action android:name="android.intent.action.MAIN" />
26 <category android:name="android.intent.category.LAUNCHER" />
27 </intent-filter>
28 </activity>
29
30
31 </application>
32
33 </manifest>
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