Android监听WIFI网络的变化并且获得当前信号强度

jopen 10年前

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        *         *        */        public class MainActivity extends Activity {                    @Override            protected void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.main);            }        }
</div> </div>


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);                }           }                }
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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>
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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>
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