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我想问一些我在我的应用程序中不理解的东西。我从服务器获取一些数据，并使用谷歌的Volley库在回收站中显示它们。到现在为止还挺好：）。检查是否有互联网连接
接下来，我从列表中获取这些数据，并通过内容提供者将它们添加到SQLite。最后，如果没有互联网连接，我应该从手机的存储库中读取它们（现在我应该得到Toast消息，指出没有互联网连接）。这是事情。当我关闭wifi时，NoInternet Activity不会启动。但是，当我将手机置于飞行模式时，NoInternet Activity会启动。这是我的代码。
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;
}
}
}
任何想法？
谢谢，
泰奥。
就在你的手机的数据连接？ –
您的片段的onCreateView方法可能会多次调用。 – SilentKiller
@ Chintan Soni。你的意思是WiFi？ – Theo