Android监听WIFI网络的变化并且获得当前信号强度

开心123

　　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.iyunv.com/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>