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。