在Android中扫描wifi热点演示实例教程

早上发了一段扫描wifi热点的代码，有同学反馈说编译不通过，晚上有点时间，重新试了一下，发现没啥问题，想汇总下测试过程，给需要的人参考。

1、首先新建了布局模板XML文件vifi.xml,代码很简单，如下：

<?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">                 <TextView android:id="@+id/wifi"           android:layout_width="fill_parent"             android:layout_height="wrap_content"           android:text="@string/hello" />       </LinearLayout>

2、写java代码，新建个Activity，代码如下：

package com.eoeandroid.demo.testcode;     import java.util.List;   import android.app.Activity;   import android.content.BroadcastReceiver;   import android.content.Context;  import android.content.Intent;   import android.content.IntentFilter;   import android.net.wifi.ScanResult;   import android.net.wifi.WifiManager;   import android.os.Bundle;   import android.view.Menu;   import android.view.MenuItem;   import android.widget.TextView;       public class WifiTester extends Activity {             TextView mainText;          WifiManager mainWifi;          WifiReceiver receiverWifi;          List<ScanResult> wifiList;          StringBuilder sb = new StringBuilder();               public void onCreate(Bundle savedInstanceState) {                     super.onCreate(savedInstanceState);                  setContentView(R.layout.vifi);                     setTitle("eoe教程: Wifi Test.  -by:IceskYsl");                   mainText = (TextView) findViewById(R.id.wifi);                  mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);                  receiverWifi = new WifiReceiver();                   registerReceiver(receiverWifi, new IntentFilter(                                     WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));                   mainWifi.startScan();                   mainText.setText("\nStarting Scan...\n");             }             public boolean onCreateOptionsMenu(Menu menu) {                     menu.add(0, 0, 0, "Refresh");                   return super.onCreateOptionsMenu(menu);           }             public boolean onMenuItemSelected(int featureId, MenuItem item) {                     mainWifi.startScan();                  mainText.setText("Starting Scan");                  return super.onMenuItemSelected(featureId, item);             }             protected void onPause() {                     unregisterReceiver(receiverWifi);                   super.onPause();           }             protected void onResume() {                     registerReceiver(receiverWifi, new IntentFilter(                                  WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));                   super.onResume();             }             class WifiReceiver extends BroadcastReceiver {                     public void onReceive(Context c, Intent intent) {                             sb = new StringBuilder();                           wifiList = mainWifi.getScanResults();                             for (int i = 0; i < wifiList.size(); i++) {                                     sb.append(new Integer(i + 1).toString() + ".");                                   sb.append((wifiList.get(i)).toString());                                   sb.append("\n\n");                           }                           mainText.setText(sb);                   }           }     }

3、申请相关权限，代码如下：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>   <uses-permission android:name="android.permission.ACCESS_CHECKIN_PROPERTIES"></uses-permission>   <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>   <uses-permission android:name="android.permission.INTERNET"></uses-permission>   <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>   <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"></uses-permission>

4、OK，就这些，效果看附件图片，我扫描到我这有2个热点。



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