Android监听WIFI网络的变化并且获得当前信号强度

MainActivity如下:

package cc.testwifi;

import android.os.Bundle;
import android.app.Activity;
/**
 * Demo描述:
 * 监听Wifi网络的变化并且获得当前信号强度
 * 
 * 参考资料:
 * http://blog.csdn.net/way_ping_li/article/details/8777478
 * Thank you very much
 *
 */
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}
}

WifiChangeBroadcastReceiver如下:

package cc.testwifi;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;

public class WifiChangeBroadcastReceiver extends BroadcastReceiver {
	private Context mContext;
	@Override
	public void onReceive(Context context, Intent intent) {
		mContext=context;
		System.out.println("Wifi发生变化");
		getWifiInfo();
	}
	
	private void getWifiInfo() {
        WifiManager wifiManager = (WifiManager) mContext.getSystemService(mContext.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        if (wifiInfo.getBSSID() != null) {
        	//wifi名称
            String ssid = wifiInfo.getSSID();
            //wifi信号强度
            int signalLevel = WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 5);
            //wifi速度
            int speed = wifiInfo.getLinkSpeed();
            //wifi速度单位
            String units = WifiInfo.LINK_SPEED_UNITS;
            System.out.println("ssid="+ssid+",signalLevel="+signalLevel+",speed="+speed+",units="+units);
        }
   }

}

AndroidManifest.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cc.testwifi"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="10" />
    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="cc.testwifi.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <receiver android:name="cc.testwifi.WifiChangeBroadcastReceiver">
            <intent-filter >
                <action android:name="android.net.wifi.RSSI_CHANGED" />         
            </intent-filter>
        </receiver>
    </application>

</manifest>

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="监听wifi变化并获得当前信号强度" 
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dip"
    />

</RelativeLayout>