在Android中扫描wifi热点演示实例教程

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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。