服务和广播接收器检查网络是否可用

Question

我知道很多人会觉得这个问题不值得，但我是新手 android development.I 想了解有关服务和广播的信息 receivers.I 在广播接收器上查看了一些演示应用程序并且做了几个演示 apps.Now 我想要完成的事情我需要帮助。我想创建一个在后台运行的服务，它会告诉用户可用的网络或 wifi 或者 not.Please 帮助我 out.Thanks

Answer 1

stack overflow 和其他网站上有很多可用的解决方案。一个好的解决方案是 here..

Answer 2

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>

在你接收器class

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();
    }
}

网络实用程序 class 检查连接性

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;
    }
}

在你的Activity中你可以实现网络接口

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
    }


}

服务和广播接收器检查网络是否可用

Services and broadcast receivers to check network available or not

android

android-service