Java tutorial
/* * Copyright (c) <2017> <Vivek Rajendran> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package es.esy.vivekrajendran.news.fragments; import android.app.ProgressDialog; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.view.MenuItemCompat; import android.support.v7.widget.SearchView; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import es.esy.vivekrajendran.news.R; import es.esy.vivekrajendran.news.data.DBHelper; import es.esy.vivekrajendran.news.data.NewsContract; import es.esy.vivekrajendran.news.data.UserPref; import es.esy.vivekrajendran.news.network.NewsAsync; import es.esy.vivekrajendran.news.util.NetworkChecker; import es.esy.vivekrajendran.news.util.NewsCursorAdapter; public class LatestNewsFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor>, SearchView.OnQueryTextListener { private static final int LATEST_NEWS_LOADER = 452; private static final int LATEST_NEWS_SEARCH_LOADER = 751; private NewsCursorAdapter newsCursorAdapter; private ProgressDialog progressDialog; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { try { return LayoutInflater.from(getContext()).inflate(R.layout.fragment_latest, container, false); } catch (Exception e) { return null; } } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); progressDialog = new ProgressDialog(getContext()); progressDialog.setMessage("loading"); setHasOptionsMenu(true); try { Log.i("TAG", "onViewCreated: LatestNewsFragment loading finished"); ListView latestNewsListView = (ListView) view.findViewById(R.id.lv_frag_latest); View emptyView = view.findViewById(R.id.empty_view); // getData(); latestNewsListView.setEmptyView(emptyView); newsCursorAdapter = new NewsCursorAdapter(getActivity(), null); latestNewsListView.setAdapter(newsCursorAdapter); getLoaderManager().initLoader(LATEST_NEWS_LOADER, null, LatestNewsFragment.this); } catch (Exception e) { Log.i("TAG", "onViewCreated: LatestNewsFragment " + e.getMessage()); } } public void getData() { String url = "https://newsapi.org/v1/articles?source=the-next-web&sortBy=latest&apiKey=a65e2431ef9141ab93e78509b14554d0"; if (NetworkChecker.getInstance(getContext()).isNetworkAvailable() && UserPref.getInstance(getContext()).isImageFetchable()) { new NewsAsync(getContext()).execute(url, NewsAsync.NEWS); Log.i("TAG", "onViewCreated: Async Called" + System.currentTimeMillis()); } else { Log.i("TAG", "LatestNewsFragment getData: Network unavailable: " + "Time " + System.currentTimeMillis() + "Fetchable " + UserPref.getInstance(getContext()).isNewsFetchable() + ": NetworkStatus " + NetworkChecker.getInstance(getContext()).isNetworkAvailable()); } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { progressDialog.show(); return new CursorLoader(getContext(), NewsContract.News.CONTENT_URI, null, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { progressDialog.cancel(); newsCursorAdapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { newsCursorAdapter.swapCursor(null); } @Override public boolean onQueryTextSubmit(String query) { return false; } @Override public boolean onQueryTextChange(String newText) { String queryString = "SELECT * FROM " + NewsContract.News.TABLE_NAME + " WHERE " + NewsContract.News.COLUMN_DESCRIPTION + " LIKE '%" + newText + "%'"; Cursor cursor = new DBHelper(getContext()).getReadableDatabase().rawQuery(queryString, null); onLoadFinished(new Loader<Cursor>(getContext()), cursor); return true; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_search, menu); final MenuItem item = menu.findItem(R.id.app_bar_search); final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item); // searchView.setOnQueryTextListener(this); MenuItemCompat.setOnActionExpandListener(item, new MenuItemCompat.OnActionExpandListener() { @Override public boolean onMenuItemActionCollapse(MenuItem item) { return true; } @Override public boolean onMenuItemActionExpand(MenuItem item) { return true; } }); // searchView.setOnCloseListener( new SearchView.OnCloseListener() { // @Override // public boolean onClose() { // getLoaderManager().initLoader(LATEST_NEWS_LOADER, null, LatestNewsFragment.this); // return true; // } // }); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.app_bar_search) { Log.i("TAG", "onOptionsItemSelected: Search clicked"); } return true; } }