[android] How to check internet access on Android? InetAddress never times out

For me it was not a good practice to check the connection state in the Activity class, because

ConnectivityManager cm =
    (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

should be called there, or you need to push down your Activity instance (context) to the connection handler class to able to check the connection state there When no available connection (wifi, network) I catch the UnknownHostException exception:

JSONObject jObj = null;
Boolean responded = false;
HttpGet requestForTest = new HttpGet("http://myserver.com");
try {
    new DefaultHttpClient().execute(requestForTest);
    responded = true;
} catch (UnknownHostException e) {
    jObj = new JSONObject();
    try {
        jObj.put("answer_code", 1);
        jObj.put("answer_text", "No available connection");
    } catch (Exception e1) {}
    return jObj;
} catch (IOException e) {
    e.printStackTrace();
}

In this way I can handle this case along with the other cases in the same class (my server always response back with a json string)

Examples related to android

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How to implement a simple scenario the OO way My eclipse won't open, i download the bundle pack it keeps saying error log getting " (1) no such column: _id10 " error java doesn't run if structure inside of onclick listener Cannot retrieve string(s) from preferences (settings) strange error in my Animation Drawable how to put image in a bundle and pass it to another activity FragmentActivity to Fragment A failure occurred while executing com.android.build.gradle.internal.tasks

Examples related to networking

Access HTTP response as string in Go Communication between multiple docker-compose projects Can't access 127.0.0.1 How do I delete virtual interface in Linux? ConnectivityManager getNetworkInfo(int) deprecated Bridged networking not working in Virtualbox under Windows 10 Difference between PACKETS and FRAMES How to communicate between Docker containers via "hostname" java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused) wget: unable to resolve host address `http'

Examples related to asynchronous

How to read file with async/await properly? Use Async/Await with Axios in React.js Waiting until the task finishes How to reject in async/await syntax? React - Display loading screen while DOM is rendering? angular 2 how to return data from subscribe How do I access store state in React Redux? SyntaxError: Unexpected token function - Async Await Nodejs Why does .json() return a promise? Why is setState in reactjs Async instead of Sync?