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 {@Overrideprotected 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;@Overridepublic 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>