苏叶薇,康熙来了20111130,将军太勾魂
1.首先在androidmanifest.xml文件中添加如下代码以开启权限：
1 <!-- 获取wifi状态的权限 --> 2 <uses-permission android:name="android.permission.access_wifi_state"/> 3 <!-- 改变wifi状态的权限 --> 4 <uses-permission android:name="android.permission.change_wifi_state"/> 5 <!-- 获取网络的权限 --> 6 <uses-permission android:name="android.permission.internet"/> 7 <!-- 获取网络状态的权限 --> 8 <uses-permission android:name="android.permission.access_network_state"/> 9 <!-- 改变网络状态的权限 --> 10 <uses-permission android:name="android.permission.change_network_state"/> 11 12 <!-- 往sdcard写入数据权限 --> 13 <uses-permission android:name="android.permission.write_external_storage"/> 14 <!-- 从sdcard读取数据权限 --> 15 <uses-permission android:name="android.permission.read_external_storage"/> 16 <!-- 在sdcard中创建与删除文件权限 --> 17 <uses-permission android:name="android.permission.mount_unmount_filesystems"/>
1 // 获取系统wifi服务 2 wifimanage wm = (wifimanager) getapplicationcontext().getsystemservice(wifi_service); 3 4 // 获取当前所连接wifi的信息 5 wifiinfo wi = wm.getconnectioninfo(); 6 7 // 获取扫描到的所有wifi信息 8 list<scanresult> scanresults = wm.getscanresults(); 9 10 // 将rssi分为numlevels个等级，返回rssi处在哪一个等级 11 int level = wm.calculatesignallevel (int rssi,int numlevels); 12 13 // 获取当前手机wifi网卡状态 14 int state = wm.getwifistate(); 15 返回值为以下宏定义 16 wifimanager.wifi_state_enabled wifi网卡可用 17 wifimanager.wifi_state_disabled wifi网卡不可用 18 wifimanager.wifi_state_disabling wifi网卡正关闭 19 wifimanager.wifi_state_enabling wifi网卡正打开 20 wifimanager.wifi_state_unknown 状态未知 21 22 // 判断wifi是否打开 23 boolean flag = iswifienabled(); 24 // 打开wifi 25 boolean flag = setwifienabled(true); 26 // 关闭wifi 27 boolean flag = setwifienabled(false);
注：api文档中提到使用list<scanresult> getscanresults()时，最好额外添加两个权限（保护等级：危险），详见链接
an app must hold access_coarse_location or access_fine_location permission in order to get valid results
access_coarse_location：allows an app to access approximate location.
access_fine_location：allows an app to access precise location.
1 <?xml version="1.0" encoding="utf-8"?> 2 <relativelayout 3 xmlns:android="http://schemas.android.com/apk/res/android" 4 xmlns:tools="http://schemas.android.com/tools" 5 tools:context=".mainactivity" 6 android:layout_width="match_parent" 7 android:layout_height="match_parent" 8 android:orientation="vertical"> 9 10 <button 11 android:id="@+id/start_btn" 12 android:layout_width="wrap_content" 13 android:layout_height="wrap_content" 14 android:layout_marginstart="45dp" 15 android:text="@string/start_scan" 16 android:onclick="doclick"/> 17 18 <button 19 android:id="@+id/stop_btn" 20 android:layout_width="wrap_content" 21 android:layout_height="wrap_content" 22 android:layout_marginstart="10dp" 23 android:layout_toendof="@+id/start_btn" 24 android:text="@string/stop_scan" 25 android:onclick="doclick"/> 26 27 <button 28 android:id="@+id/save_btn" 29 android:layout_width="wrap_content" 30 android:layout_height="wrap_content" 31 android:layout_marginstart="10dp" 32 android:layout_toendof="@+id/stop_btn" 33 android:text="@string/save_data" 34 android:onclick="doclick"/> 35 36 <linearlayout 37 android:layout_width="match_parent" 38 android:layout_height="wrap_content" 39 android:layout_below="@+id/start_btn" 40 android:layout_margintop="10dp" 41 android:orientation="vertical"> 42 43 <textview 44 android:id="@+id/connected_wifi_tv" 45 android:layout_width="match_parent" 46 android:layout_height="wrap_content" 47 android:text="@string/connected_wifi" /> 48 49 <textview 50 android:id="@+id/connected_wifi_info_tv" 51 android:layout_width="match_parent" 52 android:layout_height="wrap_content" 53 android:layout_margintop="10dp" 54 android:text=""/> 55 56 <textview 57 android:layout_width="match_parent" 58 android:layout_height="2dp" 59 android:layout_margintop="5dp"/> 60 61 <textview 62 android:id="@+id/scan_results_tv" 63 android:layout_width="match_parent" 64 android:layout_height="wrap_content" 65 android:layout_margintop="5dp" 66 android:text="@string/scan_results" /> 67 68 <scrollview 69 android:layout_width="match_parent" 70 android:layout_height="wrap_content" 71 android:layout_margintop="10dp" 72 android:fadingedge="vertical" 73 android:scrollbars="vertical"> 74 75 <textview 76 android:id="@+id/scan_results_info_tv" 77 android:layout_width="match_parent" 78 android:layout_height="wrap_content" 79 android:text=""/> 80 </scrollview> 81 </linearlayout> 82 </relativelayout>
我要评论 1 package com.lee.rss_sampler;
2
3 import android.app.activity;
4 import android.net.wifi.scanresult;
5 import android.net.wifi.wifiinfo;
6 import android.net.wifi.wifimanager;
7 import android.os.environment;
8 import android.os.bundle;
9 import android.view.view;
10 import android.widget.textview;
11 import android.widget.toast;
12
13 import java.io.fileoutputstream;
14 import java.util.list;
15
16 public class mainactivity extends activity {
17
18 public boolean mflag = true; // 控制线程终止
19 private stringbuilder mlistinfo;// 保存扫描的wifi列表信息
20 private textview mtextviewcurrwifiinfo; // 显示当前所连wifi信息的组件
21 private textview mtextviewscanwifiinfo; // 显示扫描到的wifi信息的组件
22
23 @override
24 protected void oncreate(bundle savedinstancestate) {
25 super.oncreate(savedinstancestate);
26 setcontentview(r.layout.activity_main);
27 mtextviewcurrwifiinfo = findviewbyid(r.id.connected_wifi_info_tv);
28 mtextviewscanwifiinfo = findviewbyid(r.id.scan_results_info_tv);
29 }
30
31 public void doclick(view view){
32 switch (view.getid()){
33 case r.id.start_btn:
34 mflag = true; // 标志位置为true，允许线程运行
35 // 启动wifi扫描的线程
36 scanthread scanthread = new scanthread();
37 scanthread.start();
38 break;
39 case r.id.stop_btn:
40 mflag = false; // 标志位置为false，终止线程
41 break;
42 case r.id.save_btn:
43 string filename = "wifi_data.txt";
44 string filecontent = mlistinfo.tostring();
45 try{
46 savefiletosd(filename,filecontent);
47 toast.maketext(getapplicationcontext(), "数据写入成功", toast.length_short).show();
48 }catch (exception e){
49 e.printstacktrace();
50 toast.maketext(getapplicationcontext(), "数据写入失败", toast.length_short).show();
51 }
52 break;
53 }
54 }
55
56 private class scanthread extends thread {
57 @override
58 public void run() {
59 while (mflag) {
60 // 在ui线程中获取wifi信息，并更新ui
61 runonuithread(new runnable() {
62 @override
63 public void run() {
64 obtainlistinfo();
65 }
66 });
67 // 采样频率500ms
68 try {
69 thread.sleep(500);
70 } catch (interruptedexception e) {
71 e.printstacktrace();
72 }
73 }
74 }
75 }
76
77 private void obtainlistinfo(){
78 // 获取wifi管理器
79 wifimanager wifimanager = (wifimanager) getapplicationcontext().getsystemservice(wifi_service);
80
81 // 如果wifi未打开，先打开wifi
82 /*if (wifimanager.getwifistate() != wifimanager.wifi_state_enabled) {
83 wifimanager.setwifienabled(true);
84 }*/
85 if(!wifimanager.iswifienabled()){
86 wifimanager.setwifienabled(true);
87 }
88
89 // 获取并保存当前所连wifi信息
90 wifiinfo wifiinfo = wifimanager.getconnectioninfo();
91 string mcurrentconnect = "ssid: " + wifiinfo.getssid() +
92 "\nmac address: " + wifiinfo.getbssid() +
93 "\nsignal strength(dbm): " + wifiinfo.getrssi() +
94 "\nspeed: " + wifiinfo.getlinkspeed() + " " + wifiinfo.link_speed_units;
95
96 // 获取并保存扫描的wifi列表信息
97 mlistinfo = new stringbuilder();
98 list<scanresult> scanresults = wifimanager.getscanresults();
99 for (scanresult sr:scanresults){
100 mlistinfo.append("ssid: ");
101 mlistinfo.append(sr.ssid);
102 mlistinfo.append("\nmac address: ");
103 mlistinfo.append(sr.bssid);
104 mlistinfo.append("\nsignal strength(dbm): ");
105 mlistinfo.append(sr.level);
106 mlistinfo.append("\n\n");
107 }
108
109 // 更新ui上显示的wifi信息
110 mtextviewcurrwifiinfo.settext(mcurrentconnect);
111 mtextviewscanwifiinfo.settext(mlistinfo.tostring());
112 }
113
114 //往sd卡写入文件的方法
115 public void savefiletosd(string filename, string filecontent) throws exception {
116 // 先判断是否有sd卡以及是否有读取sd卡的权限
117 if (environment.getexternalstoragestate().equals(environment.media_mounted)) {
118 // 设置文件路径
119 string filepath = environment.getexternalstoragedirectory().getcanonicalpath() + "/" + filename;
120 // new一个文件输出流对象
121 fileoutputstream output = new fileoutputstream(filepath);
122 //将string字符串以字节流的形式写入到输出流中
123 output.write(filecontent.getbytes());
124 output.close(); //关闭输出流
125 } else {
126 toast.maketext(mainactivity.this, "sd卡不存在或者不可读写", toast.length_short).show();
127 }
128 }
129
130 // 从sd卡中读取文件的方法
131 public string readfilefromsd(string filename){
132 // todo
133 return null;
134 }
135 }
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