在 Android 中检查 Internet 连接

Checking Internet connection in Android(在 Android 中检查 Internet 连接)

问题描述

Is there any background task which runs with in application to check for internet connectivity for below scenarios as common ?

1.Start of parsing/fetching data from server

2.In between of parsing/fetching from server

Any sample code or links helps me a lot.

You can use the below utility class make sure to give internet permission in manifest.

Let me know if any issues.

private static NetworkUtil mInstance;
private volatile boolean mIsOnline;

private NetworkUtil() {
    ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();
    exec.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            boolean reachable = false;
            try {
                Process process = java.lang.Runtime.getRuntime().exec("ping -c 1 www.google.com");
                int returnVal = process.waitFor();
                reachable = (returnVal==0);
            } catch (Exception e) {
                e.printStackTrace();
            }
            mIsOnline = reachable;
        }
    }, 0, 5, TimeUnit.SECONDS);
}

public static NetworkUtil getInstance() {
    if (mInstance == null) {
        synchronized (NetworkUtil.class) {
            if (mInstance == null) {
                mInstance = new NetworkUtil();
            }
        }
    }
    return mInstance;
}

public boolean isOnline() {
    return mIsOnline;
}

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