Question

我的清单中有以下内容

 <receiver android:name=".receiver.WifiReceiver" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
 </receiver>

以及以下的BroadcastReceiver：

public class WifiReceiver extends BroadcastReceiver { 
private static String TAG = makeLogTag(WifiReceiver.class);

@Override
public void onReceive(Context context, Intent intent) {

    ConnectivityManager connectivityManager = (ConnectivityManager)
            context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = null;
    if (connectivityManager != null) {
        networkInfo =
                connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        LOGD(TAG, "connectivity info:" + networkInfo);
    }

   if(networkInfo != null && networkInfo.isConnected()) {
       //TODO: see why this is called multiple times and handle schedule reloading
       LOGD(TAG, "have Wifi connection and is connected");
   }else
       LOGD(TAG, "don't have Wifi connect or it isn't connected");
}

当我从手机切换到wifi时，接收器被多次调用（没有问题）但是 if(networkInfo != null && networkInfo.isConnected())分支全部评估为4次

Answer 1

public class NetworkChangeReceiver extends BroadcastReceiver {
Context mContext;

@Override
public void onReceive(Context context, Intent intent) {
    mContext = context;
    String status = NetworkUtil.getConnectivityStatusString(context);

    Log.e("Receiver ", "" + status);

    if (status.equals("Not connected to Internet")) {
        Log.e("Receiver ", "not connction");// your code when internet lost


    } else {
        Log.e("Receiver ", "connected to internet");//your code when internet connection come back
    }

}

}

并使用此调用来检查wifi或互联网连接丢失

public class NetworkUtil {

public static int TYPE_WIFI = 1;
public static int TYPE_MOBILE = 2;
public static int TYPE_NOT_CONNECTED = 0;

public static int getConnectivityStatus(Context context) {

    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

    if (null != activeNetwork) {

        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
            return TYPE_WIFI;

        if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
            return TYPE_MOBILE;
    }
    return TYPE_NOT_CONNECTED;
}

public static String getConnectivityStatusString(Context context) {

    int conn = NetworkUtil.getConnectivityStatus(context);

    String status = null;
    if (conn == NetworkUtil.TYPE_WIFI) {
        //status = "Wifi enabled";
        status="Internet connection available";
    } else if (conn == NetworkUtil.TYPE_MOBILE) {
        //status = "Mobile data enabled";
        status="Internet connection available";
    } else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) {
        status = "Not connected to Internet";
    }
    return status;
}

}

并将其添加到您的androidmanifest文件中

<receiver
        android:name=".NetworkChangeReceiver"
        android:label="NetworkChangeReceiver" >
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
        </intent-filter>
    </receiver>

在清单文件中添加互联网权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

我希望它适合你和

Answer 2

奇怪。无论如何尝试这个有点不同的代码：

ConnectivityManager cm =
    (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if(activeNetwork != null){
    boolean isConnected = activeNetwork.isConnected();
    boolean isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI;

    if(isConnected && isWiFi){

    }
}

android.net.conn.CONNECTIVITY_CHANGE上的BroadcastReceiver被多次调用

2 个答案: