Java tutorial
/** See the NOTICE file distributed with this work for additional information regarding copyright ownership. This code is licensed to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package edu.rit.csh.androidwebnews; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.util.Log; import android.view.inputmethod.InputMethodManager; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; import com.actionbarsherlock.widget.SearchView; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.HashMap; /** * This is used to display all the threads from a particular newsgroup */ public class DisplayThreadsActivity extends BaseActivity { public String newsgroupName; private InvalidApiKeyDialog dialog; public ArrayList<PostThread> threadsDirectMap; private ConnectionExceptionDialog connectionDialog; static public ArrayList<PostThread> lastFetchedThreads; NewsgroupListMenu newsgroupListMenu; public boolean requestedAdditionalThreads = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); lastFetchedThreads = new ArrayList<PostThread>(); sharedPref = PreferenceManager.getDefaultSharedPreferences(this); hc = new HttpsConnector(this); dialog = new InvalidApiKeyDialog(this); Bundle extras = getIntent().getExtras(); connectionDialog = new ConnectionExceptionDialog(this); if (extras != null) { newsgroupName = extras.getString("SELECTED_NEWSGROUP"); } else { newsgroupName = "none"; } threadsDirectMap = new ArrayList<PostThread>(); newsgroupListMenu = new NewsgroupListMenu(this); newsgroupListMenu.checkEnabled(); setContentView(R.layout.displaythreads_activity); if (!sharedPref.getString("newsgroups_json_string", "").equals("")) { newsgroupListMenu.update(hc.getNewsGroupFromString(sharedPref.getString("newsgroups_json_string", ""))); hc.startUnreadCountTask(); } else { hc.getNewsGroups(); } hc.getNewsgroupThreads(newsgroupName, 20); setTitle(newsgroupName); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getSupportMenuInflater().inflate(R.menu.displaythreads_menu, menu); // Get the SearchView and set the searchable configuration final SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView(); searchView.setIconifiedByDefault(false); // Do not iconify the widget; expand it by default SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() { public boolean onQueryTextChange(String newText) { return true; } public boolean onQueryTextSubmit(String query) { InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(searchView.getWindowToken(), 0); Intent intent = new Intent(DisplayThreadsActivity.this, SearchResultsActivity.class); HashMap<String, String> params = new HashMap<String, String>(); params.put("keywords", query); intent.putExtra("params", params); startActivity(intent); return true; } }; searchView.setOnQueryTextListener(queryTextListener); return super.onCreateOptionsMenu(menu); } public void viewPost(int item) { if (item >= threadsDirectMap.size()) return; PostThread thread = threadsDirectMap.get(item); PostThread selected = thread; while (thread.getParent() != null) thread = thread.getParent(); Intent intent = new Intent(this, PostSwipeableActivity.class); intent.putExtra("SELECTED_NEWSGROUP", thread.getNewsgroup()); intent.putExtra("SELECTED_ID", thread.getNumber()); intent.putExtra("GOTO_THIS", threadsDirectMap.indexOf(selected) - threadsDirectMap.indexOf(thread)); Log.d("des", "intent made"); startActivity(intent); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.new_post: Intent myIntent = new Intent(this, ComposeActivity.class); myIntent.putExtra("NEWSGROUP", newsgroupName); startActivity(myIntent); return true; case R.id.menu_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; case R.id.menu_refresh: hc.getNewest(true); hc.getNewsGroups(); return true; case R.id.menu_about: startActivity(new Intent(this, InfoActivity.class)); return true; case R.id.menu_adv_search: startActivity(new Intent(this, SearchActivity.class)); return true; case R.id.menu_mark_all_read: hc.markRead(); hc.getNewest(false); hc.getNewsGroups(); return true; } return super.onOptionsItemSelected(item); } @Override public boolean onSearchRequested() { startActivity(new Intent(this, SearchActivity.class)); return super.onSearchRequested(); } @Override public void update(String jsonString) { if (jsonString.startsWith("Error:")) { // error in the Async Task connectionDialog.setMessage(jsonString); if (!connectionDialog.isShowing()) { connectionDialog.show(); } } else { try { JSONObject obj = new JSONObject(jsonString); if (obj.has("error")) { if (!dialog.isShowing()) { dialog.show(); } } else if (obj.has("posts_older")) { if (hc.getThreadsFromString(jsonString).size() == 0) { //hitBottom = true; ((DisplayThreadsFragment) getSupportFragmentManager() .findFragmentById(R.id.threadsfragment)).addThreads(new ArrayList<PostThread>()); } else if (!requestedAdditionalThreads) { ArrayList<PostThread> threads = hc.getThreadsFromString(jsonString); lastFetchedThreads.clear(); lastFetchedThreads = (ArrayList<PostThread>) threads.clone(); ((DisplayThreadsFragment) getSupportFragmentManager() .findFragmentById(R.id.threadsfragment)).update(threads); } else { ArrayList<PostThread> newThreads = hc.getThreadsFromString(jsonString); for (PostThread thread : newThreads) lastFetchedThreads.add(thread); ((DisplayThreadsFragment) getSupportFragmentManager() .findFragmentById(R.id.threadsfragment)).addThreads(newThreads); requestedAdditionalThreads = false; } } else if (obj.has("unread_counts")) { // unread count int unread = hc.getUnreadCountFromString(jsonString)[0]; int groupUnread = 0; for (Newsgroup group : hc .getNewsGroupFromString(sharedPref.getString("newsgroups_json_string", ""))) { groupUnread += group.unreadCount; } if (unread != groupUnread) { hc.getNewsGroups(); } else { newsgroupListMenu.update( hc.getNewsGroupFromString(sharedPref.getString("newsgroups_json_string", ""))); } } else { // newsgroups SharedPreferences.Editor editor = sharedPref.edit(); editor.putString("newsgroups_json_string", jsonString); editor.commit(); newsgroupListMenu.update(hc.getNewsGroupFromString(jsonString)); } } catch (JSONException ignored) { } } } @Override public void onNewsgroupSelected(String newsgroupName) { if (!newsgroupName.equals(this.newsgroupName)) { Intent myIntent = new Intent(DisplayThreadsActivity.this, DisplayThreadsActivity.class); myIntent.putExtra("SELECTED_NEWSGROUP", newsgroupName); startActivity(myIntent); finish(); } } @Override public void onRestart() { // throwing issue when we try to call any hc.get..., need to fix for updating newsgroups onResume(); hc.startUnreadCountTask(); hc.getNewsgroupThreads(newsgroupName, 20, false); } }