android应用程序运行时如何在后台连续检查互联网连接

问题描述

我想在我的android应用程序运行时在后台连续检查互联网连接.我的意思是从应用程序开始到应用程序结束.我该怎么做?应该怎么办?

I want to check internet connectivity continuously in background while my android application running. I mean from starting of the application to the end of the application. How can i do it? What should be the approach?

推荐答案

我知道我来不及回答这个问题了.但这是一种在活动/片段中连续监视网络连接的方法.

I know I am late to answer this Question.But here is a way to monitor the Network Connection Continuously in an Activity/Fragment.

我们将使用网络回调来监视活动/片段中的连接

We will use Network Callback to monitor our connection in an Activity/Fragment

首先，在类中声明两个变量

first, declare two variable in class

// to check if we are connected to Network
boolean isConnected = true;

// to check if we are monitoring Network
private boolean monitoringConnectivity = false;

接下来，我们将编写网络回调方法

Next, We will write the Network Callback Method

private ConnectivityManager.NetworkCallback connectivityCallback
            = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
            isConnected = true;
            LogUtility.LOGD(TAG, "INTERNET CONNECTED");
        }

        @Override
        public void onLost(Network network) {
            isConnected = false;
            LogUtility.LOGD(TAG, "INTERNET LOST");
        }
    };

现在，既然我们已经编写了Callback，我们现在将编写一个方法来监视我们的网络连接，并在此方法中，我们将注册NetworkCallback.

Now Since we have written our Callback we will Now write a method which will monitor our Network Connection, and in this method, we will register our NetworkCallback.

// Method to check network connectivity in Main Activity
    private void checkConnectivity() {
        // here we are getting the connectivity service from connectivity manager
        final ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(
                Context.CONNECTIVITY_SERVICE);

        // Getting network Info
        // give Network Access Permission in Manifest
        final NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();

        // isConnected is a boolean variable
        // here we check if network is connected or is getting connected
        isConnected = activeNetworkInfo != null && activeNetworkInfo.isConnectedOrConnecting();

        if (!isConnected) {
            // SHOW ANY ACTION YOU WANT TO SHOW
            // WHEN WE ARE NOT CONNECTED TO INTERNET/NETWORK
            LogUtility.LOGD(TAG, " NO NETWORK!");
// if Network is not connected we will register a network callback to  monitor network
            connectivityManager.registerNetworkCallback(
                    new NetworkRequest.Builder()
                            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
                            .build(), connectivityCallback);
            monitoringConnectivity = true;
        }

    }

我们所有的工作都快完成了，我们只需要调用我们的Activity/Fragment的onResume()中的方法checkConnectivity()

All our work is almost finished we just need to call our checkConnectivity(), the method in onResume() of our Activity/Fragment

  @Override
    protected void onResume() {
        super.onResume();
        checkConnectivity();
    }

*在活动/片段方法onPause()中取消注册网络回调*

   @Override
    protected void onPause() {
        // if network is being moniterd then we will unregister the network callback
        if (monitoringConnectivity) {
            final ConnectivityManager connectivityManager
                    = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            connectivityManager.unregisterNetworkCallback(connectivityCallback);
            monitoringConnectivity = false;
        }
        super.onPause();
    }

就是这样，只需添加此代码即可在其中监视网络的活动/片段的每个类！并且不要忘记注销它！

That's it, just add this code in which every class of your Activity/Fragment were you need to monitor the Network!.And don't forget to unregister it!!!

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