服务和广播接收机检查网络是否可用

Question

我知道很多人会觉得这个问题不值得，但我是android开发的新手。我想知道有关服务和广播接收器的信息。我已经在广播接收器上查看了一些演示应用程序，并制作了几个演示应用程序。现在我正在努力完成的事情需要帮助。我想创建一个在后台运行的服务，它会告诉用户网络或wifi是否可用。请帮帮我。感谢

Answer 1

您可以使用广播接收器

<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>

在你的接收器类

public class NetworkChangeReceiver extends BroadcastReceiver {
    public static Internet internet;
    public static String changestatus = "";
    @Override
    public void onReceive(final Context context, final Intent intent) {
        String status = NetworkUtil.getConnectivityStatusString(context);
        if (status.equals("Not connected to Internet")) {
            if (context != null && internet != null) {
                internet.net();
            }
        }
        changestatus = status;
    }
    public interface Internet {
        public void net();
    }
}

检查连接的网络Util类

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) {
        if (context==null) {
            return 0;
        }
        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";
        } else if (conn == NetworkUtil.TYPE_MOBILE) {
            status = "Mobile data enabled";
        } else if (conn == NetworkUtil.TYPE_NOT_CONNECTED) {
            status = "Not connected to Internet";
        }
        return status;
    }
}

在您的活动中，您可以实现网络接口

public class MyActivity extends FragmentActivity implements
        Internet {
    @Override
    protected void onCreate(Bundle arg0) {
        // TODO Auto-generated method stub
        super.onCreate(arg0);
        NetworkChangeReceiver.internet = this;
    }

    @Override
    public void net() {
        // TODO Auto-generated method stub
        //Show Alert connection is not avaiable
    }

}

Answer 2

在堆栈溢出和其他站点中有很多可用的解决方案。一个好的解决方案就在这里。。