Java tutorial
/* * Copyright 2013 The Android Open Source Project * * Licensed 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 quarkstar.android.javainterviewquestions; import java.io.IOException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import model.DBConnect; import model.Query; import model.QueryDataSource; import quarkstar.fima.cardsui.views.CardUI; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.content.Context; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; 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.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.SearchView; public class MainActivity extends Activity implements SearchView.OnQueryTextListener { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; private String[] mPlanetTitles; static boolean isDbChanged = false; static public HashMap<String, Query> mQueryMap = null; private SearchView mSearchView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = getTitle(); mDrawerTitle = "Choose Category"; mPlanetTitles = getResources().getStringArray(R.array.category_array); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); //mStatusView = (TextView) findViewById(R.id.status_text); DBConnect dbConnect = new DBConnect(this); try { dbConnect.createDataBase(); } catch (IOException ioe) { throw new Error("Unable to create database"); } // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, mPlanetTitles)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // enable ActionBar app icon to behave as action to toggle nav drawer getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { public void onDrawerClosed(View view) { getActionBar().setTitle(mTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(mDrawerTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { selectItem(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); MenuItem searchItem = menu.findItem(R.id.action_search); mSearchView = (SearchView) searchItem.getActionView(); setupSearchView(searchItem); return true; } private void setupSearchView(MenuItem searchItem) { if (isAlwaysExpanded()) { mSearchView.setIconifiedByDefault(false); } else { searchItem.setShowAsActionFlags( MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); } /* SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); if (searchManager != null) { List<SearchableInfo> searchables = searchManager.getSearchablesInGlobalSearch(); SearchableInfo info = searchManager.getSearchableInfo(getComponentName()); for (SearchableInfo inf : searchables) { if (inf.getSuggestAuthority() != null && inf.getSuggestAuthority().startsWith("applications")) { info = inf; } } mSearchView.setSearchableInfo(info); } */ mSearchView.setOnQueryTextListener(this); } /* public boolean onQueryTextChange(String newText) { mStatusView.setText("Query = " + newText); return false; }*/ public boolean onQueryTextSubmit(String query) { // mStatusView.setText("Query = " + query + " : submitted"); Intent intent = new Intent(MainActivity.this, SearchActivity.class); intent.putExtra("searchQuery", query); startActivity(intent); return false; } /* public boolean onClose() { mStatusView.setText("Closed!"); return false; }*/ protected boolean isAlwaysExpanded() { return false; } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } private void selectItem(int position) { Fragment fragment = new CardListFragment(this, position); FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); mDrawerList.setItemChecked(position, true); setTitle(mPlanetTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onQueryTextChange(String newText) { // TODO Auto-generated method stub return false; } } class CardListFragment extends Fragment { QueryDataSource dataSource = null; Context context = null; int position = 0; boolean flagQueryAvailability = false; CardUI mCardView = null; View rootView = null; public CardListFragment(Context context, int position) { this.context = context; this.position = position; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { rootView = inflater.inflate(R.layout.activity_card_list, container, false); mCardView = (CardUI) rootView.findViewById(R.id.cardsview); mCardView.setSwipeable(false); return showCards(); } @Override public void onResume() { // TODO Auto-generated method stub super.onResume(); String[] subCatArr = getResources().getStringArray(R.array.category_array); if ((MainActivity.isDbChanged) && (subCatArr[position].equalsIgnoreCase("favourite"))) { showCards(); } MainActivity.isDbChanged = false; } public View showCards() { String question = ""; String answer = ""; MyCard card = null; mCardView.clearCards(); dataSource = new QueryDataSource(context); dataSource.open(); dataSource.justChangedToYes(); String[] subcatArray = getResources().getStringArray(R.array.category_array); if (subcatArray[position].equalsIgnoreCase("favourite")) MainActivity.mQueryMap = dataSource.getSelectedData("starred='yes'"); else MainActivity.mQueryMap = dataSource.getSelectedData("subcategory='" + subcatArray[position] + "' "); dataSource.close(); Iterator<Entry<String, Query>> itr = MainActivity.mQueryMap.entrySet().iterator(); while (itr.hasNext()) { flagQueryAvailability = true; Map.Entry<String, Query> pairs = (Map.Entry<String, Query>) itr.next(); final long qId = pairs.getValue().getId(); question = (String) pairs.getValue().getQuestion(); answer = (String) pairs.getValue().getAnswer(); card = new MyCard(question, answer.length() > 200 ? answer.substring(0, 200) + " ......." : answer); card.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getActivity(), ScreenSlideActivity.class); intent.putExtra("question_id", qId); startActivity(intent); } }); mCardView.addCard(card); } if (!flagQueryAvailability) mCardView.addCard(new MyCard("No records found!", "Questions in this category will be available in next update.")); mCardView.refresh(); question = null; answer = null; return rootView; } }