在后台检查互联网连接

我需要在后台检查互联网连接....我在我的数据库中保存一些数据,每当我上网时,它应该在我的服务器上传数据...我需要一个后台服务,它将检查互联网连接即使我关闭我的应用程序,我尝试了几个方法,但他们都只有我打开我的应用程序... ...目前我正在检查这样的互联网连接

/checking internet connection

    ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED ||
            connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) {

        //we are connected to a network
        connected = true;

    }
    else
       //not connected to internet
        connected = false;

    if(connected) {
        //getting teacher data if INTERNET_STATE is true(if will be still true if connected to a wifi or network without internet)
        getOfflineSubjectData();
        getTeacherData();
    }
    else{
        getOfflineSubjectData();
        Toast.makeText(teacher_homePage.this,"no internet",Toast.LENGTH_SHORT).show();
    }

注意 我不想要一个在关闭我的应用程序后无效的方法...就像我们关闭应用程序时的whatsapp一样,我们仍然会收到短信

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.widget.Toast;

public class CheckConnectivity extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent arg1) {

    boolean isConnected = arg1.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
    if(isConnected){
        Toast.makeText(context, "Internet Connection Lost", Toast.LENGTH_LONG).show();
    }
    else{
        Toast.makeText(context, "Internet Connected", Toast.LENGTH_LONG).show();
    }
   }
 }

Android清单

我知道现在回答您的问题为时已晚，但这仍然是一个完美的解决方案。

我们可以通过同时使用服务和广播接收器来轻松获得所需的输出，从而轻松地做到这一点。这将始终有效，即当应用程序正在运行，应用程序最小化或什至从最小化应用程序中删除应用程序时。

清单代码：

MyService.java

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {

static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
NotificationManager manager ;

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // Let it continue running until it is stopped.
    Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
    IntentFilter filter = new IntentFilter();
    filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
    BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (CONNECTIVITY_CHANGE_ACTION.equals(action)) {
                //check internet connection
                if (!ConnectionHelper.isConnectedOrConnecting(context)) {
                    if (context != null) {
                        boolean show = false;
                        if (ConnectionHelper.lastNoConnectionTs == -1) {//first time
                            show = true;
                            ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
                        } else {
                            if (System.currentTimeMillis() - ConnectionHelper.lastNoConnectionTs > 1000) {
                                show = true;
                                ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
                            }
                        }

                        if (show && ConnectionHelper.isOnline) {
                            ConnectionHelper.isOnline = false;
                            Log.i("NETWORK123","Connection lost");
                            //manager.cancelAll();
                        }
                    }
                } else {
                    Log.i("NETWORK123","Connected");
                    showNotifications("APP" , "It is working");
                    // Perform your actions here
                    ConnectionHelper.isOnline = true;
                }
            }
        }
    };
    registerReceiver(receiver,filter);
    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
}

ConnectionHelper.java

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class ConnectionHelper {

public static long lastNoConnectionTs = -1;
public static boolean isOnline = true;

public static boolean isConnected(Context context) {
ConnectivityManager cm =(ConnectivityManager)  context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

return activeNetwork != null && activeNetwork.isConnected();
}

public static boolean isConnectedOrConnecting(Context context) {
ConnectivityManager cm =(ConnectivityManager)         context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

return activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
}

}

您的活动代码

startService(new Intent(getBaseContext(), MyService.class));