Theo Theo - 2 months ago 8
Android Question

Checking if there is internet connection

I would like to ask something that I don't understand in my app. I get some data from my server and display them in a recyclerview using the google's Volley library. So far so good:).

Next I get those data from the list and add them to SQLite via a content provider. And finally if there is no internet connection,I should read them from the phone's repository(for now I should get a Toast message stating that there is no internet connection). Here is the thing. When I turn off the wifi the NoInternet Activity doesn't launch. However when I put my phone in Airplane mode the NoInternet Activity does launch. Here is my code.

public class AnnouncementsFragment extends Fragment {
public String titleForContentProvider;
public String imageForContentProvider;
public String articleForContentProvider;
public static final String TAG = "AelApp";
private ArrayList<MyModel> listItemsList;
private static final String IMAGE_URL = "http://www.theo-android.co.uk/ael/cms/announcement_images/";
RecyclerView myList;
private AnnouncementsAdapter adapter;

public AnnouncementsFragment() {
// Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
getActivity().setTitle("Ανακοινώσεις");

View rootView = inflater.inflate(R.layout.fragment_announcements, container, false);
listItemsList = new ArrayList<>();

myList = (RecyclerView) rootView.findViewById(R.id.listview_announcements);
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
myList.setHasFixedSize(true);
myList.setLayoutManager(linearLayoutManager);
adapter = new AnnouncementsAdapter(getActivity(), listItemsList);
myList.setAdapter(adapter);

if (isOnline()) {
updateAnnouncementsList();
}else{
Intent i = new Intent(getActivity(), NoInternet.class);
startActivity(i);
}

return rootView;
}
public void updateAnnouncementsList() {
listItemsList.clear();


// Instantiate the RequestQueue.
RequestQueue queue = Volley.newRequestQueue(getActivity());

// Request a string response from the provided URL.
JsonArrayRequest jsObjRequest = new JsonArrayRequest(Request.Method.GET, URL.GET_ANNOUNCEMENTS, new Response.Listener<JSONArray>() {

@Override
public void onResponse(JSONArray response) {

Log.d(TAG, response.toString());
//hidePD();

// Parse json data.
// Declare the json objects that we need and then for loop through the children array.
// Do the json parse in a try catch block to catch the exceptions
try {

for (int i = 0; i < response.length(); i++) {

JSONObject post = response.getJSONObject(i);

MyModel item = new MyModel();
item.setTitle(post.getString("title"));
item.setImage(IMAGE_URL + post.getString("announcement_image"));
item.setArticle(post.getString("article"));

listItemsList.add(item);
//Getting the string values out of the JSON response.
titleForContentProvider = post.getString("title");
imageForContentProvider = post.getString("announcement_image");
articleForContentProvider = post.getString("article");
//I added them as a key value pair.
ContentValues values = new ContentValues();
values.put(AELProvider.title,titleForContentProvider);
values.put(AELProvider.image,imageForContentProvider);
values.put(AELProvider.article,articleForContentProvider);
//A Content Resolver that allows the app to
//to insert data to the database after
//using the Uri defined in the Content Provider
Uri uri = getActivity().getContentResolver().insert(AELProvider.CONTENT_URL, values);
Log.d("Announcements",uri.toString());
Toast.makeText(getContext(), "Announcement added", Toast.LENGTH_LONG)
.show();

}
} catch (JSONException e) {
e.printStackTrace();
}

// Update list by notifying the adapter of changes
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
//hidePD();
}
});
queue.add(jsObjRequest);

}

protected boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
} else {
return false;
}
}
}


Any ideas?

Thanks,

Theo.

Answer

You can try this:

public class Common extends BroadcastReceiver
{
    public static boolean internet_status = false;
    public static void checkInternetConenction(Context context) {
        internet_status = false;
        ConnectivityManager check = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (check != null) {
            NetworkInfo[] info = check.getAllNetworkInfo();
            if (info != null)
                for (int i = 0; i < info.length; i++) {
                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                        internet_status = true;
                    }
                }
        }
    }

    @Override
    public void onReceive(Context context, Intent intent)
    {
        checkInternetConenction(context);
    }
}

And Add receiver in Android Menifest file:

<receiver android:name=".Common" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" >
                </action>
            </intent-filter>
        </receiver>

Set boolean value to false inside your activity:

static boolean internet_status = false;

& check connection using:

if(Common.internet_status)
                    {
                        //Do your stuff here
                    }
                    else
                    {
                        Toast.makeText(YourActivity.this, "Internet connection is not available", Toast.LENGTH_LONG).show();
                    }
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