Java tutorial
/* This file is part of RateBeer For Android. RateBeer for Android is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. RateBeer for Android is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with RateBeer for Android. If not, see <http://www.gnu.org/licenses/>. */ package com.ratebeer.android.gui.fragments; import java.io.IOException; import java.sql.SQLException; import java.text.DateFormat; import java.util.List; import org.json.JSONException; import android.content.Context; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.TextView; import com.actionbarsherlock.view.Menu; import com.googlecode.androidannotations.annotations.AfterViews; import com.googlecode.androidannotations.annotations.EFragment; import com.googlecode.androidannotations.annotations.OptionsItem; import com.googlecode.androidannotations.annotations.OptionsMenu; import com.googlecode.androidannotations.annotations.OrmLiteDao; import com.googlecode.androidannotations.annotations.ViewById; import com.j256.ormlite.dao.Dao; import com.ratebeer.android.R; import com.ratebeer.android.api.ApiException; import com.ratebeer.android.api.command.PostRatingCommand; import com.ratebeer.android.app.persistance.DatabaseHelper; import com.ratebeer.android.app.persistance.OfflineRating; import com.ratebeer.android.gui.components.RateBeerFragment; import com.ratebeer.android.gui.components.helpers.ArrayAdapter; import com.ratebeer.android.gui.components.helpers.ImportExport; import com.ratebeer.android.gui.fragments.ConfirmDialogFragment.OnDialogResult; import de.neofonie.mobile.app.android.widget.crouton.Crouton; import de.neofonie.mobile.app.android.widget.crouton.Style; @EFragment(R.layout.fragment_offlineratings) @OptionsMenu(R.menu.offlineratings) public class OfflineRatingsFragment extends RateBeerFragment { private static final int MENU_DELETE = 10; @ViewById(R.id.empty) protected TextView emptyText; @ViewById(R.id.offlineratings) protected ListView ratingsView; @OrmLiteDao(helper = DatabaseHelper.class, model = OfflineRating.class) Dao<OfflineRating, Long> offlineRatingDao; public OfflineRatingsFragment() { } @AfterViews public void init() { ratingsView.setOnItemClickListener(onItemSelected); registerForContextMenu(ratingsView); loadRatings(); } @OptionsItem(R.id.menu_add) protected void onAddRating() { load(RateFragment_.builder().build()); } @OptionsItem(R.id.menu_import) protected void onImportRatings() { new ConfirmDialogFragment(new OnDialogResult() { @Override public void onConfirmed() { try { ImportExport.importRatings(offlineRatingDao, ImportExport.DEFAULT_RATINGS_FILE); } catch (JSONException e) { Crouton.makeText(getActivity(), R.string.error_filenotvalid, Style.ALERT).show(); } catch (IOException e) { Crouton.makeText(getActivity(), R.string.error_cannotwrite, Style.ALERT).show(); } catch (ApiException e) { Crouton.makeText(getActivity(), R.string.error_cannotwrite, Style.ALERT).show(); } catch (SQLException e) { Crouton.makeText(getActivity(), R.string.rate_offline_notavailable, Style.ALERT).show(); } loadRatings(); } }, R.string.rate_offline_import_info, ImportExport.DEFAULT_RATINGS_FILE).show(getFragmentManager(), "importdialog"); } @OptionsItem(R.id.menu_export) protected void onExportRatings() { new ConfirmDialogFragment(new OnDialogResult() { @Override public void onConfirmed() { try { ImportExport.exportRatings(offlineRatingDao.queryForAll(), ImportExport.DEFAULT_RATINGS_FILE); } catch (JSONException e) { Crouton.makeText(getActivity(), R.string.error_cannotread, Style.ALERT).show(); } catch (IOException e) { Crouton.makeText(getActivity(), R.string.error_cannotread, Style.ALERT).show(); } catch (SQLException e) { Crouton.makeText(getActivity(), R.string.rate_offline_notavailable, Style.ALERT).show(); } } }, R.string.rate_offline_export_info, ImportExport.DEFAULT_RATINGS_FILE).show(getFragmentManager(), "exportdialog"); } private void loadRatings() { // Get ratings from database List<OfflineRating> result; try { result = offlineRatingDao.queryForAll(); } catch (SQLException e) { // Not available! publishException(emptyText, getString(R.string.rate_offline_notavailable)); return; } // Show in list view if (ratingsView.getAdapter() == null) { ratingsView.setAdapter(new OfflineRatingsAdapter(getActivity(), result)); } else { ((OfflineRatingsAdapter) ratingsView.getAdapter()).replace(result); } ratingsView.setVisibility(result.size() == 0 ? View.GONE : View.VISIBLE); emptyText.setVisibility(result.size() == 0 ? View.VISIBLE : View.GONE); } private OnItemClickListener onItemSelected = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { OfflineRating item = ((OfflineRatingsAdapter) ratingsView.getAdapter()).getItem(position); load(RateFragment_.buildFromOfflineID(item.getOfflineId())); } }; @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.add(Menu.NONE, MENU_DELETE, MENU_DELETE, R.string.rate_offline_delete); } @Override public boolean onContextItemSelected(android.view.MenuItem item) { AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) item.getMenuInfo(); final OfflineRating rating = (OfflineRating) ratingsView.getItemAtPosition(acmi.position); new ConfirmDialogFragment(new OnDialogResult() { @Override public void onConfirmed() { deleteRating(rating); loadRatings(); } }, R.string.rate_offline_confirmdelete, rating.getBeerName()).show(getFragmentManager(), "dialog"); return super.onContextItemSelected(item); } protected void deleteRating(OfflineRating rating) { try { offlineRatingDao.delete(rating); } catch (SQLException e) { Crouton.makeText(getActivity(), R.string.rate_offline_notavailable, Style.ALERT).show(); } } private class OfflineRatingsAdapter extends ArrayAdapter<OfflineRating> { private final DateFormat dateFormat; public OfflineRatingsAdapter(Context context, List<OfflineRating> objects) { super(context, objects); this.dateFormat = android.text.format.DateFormat.getDateFormat(getActivity()); } @Override public View getView(int position, View convertView, ViewGroup parent) { // Get the right view, using a ViewHolder ViewHolder holder; if (convertView == null) { convertView = getActivity().getLayoutInflater().inflate(R.layout.list_item_offlinerating, null); holder = new ViewHolder(); holder.beerName = (TextView) convertView.findViewById(R.id.beerName); holder.total = (TextView) convertView.findViewById(R.id.total); holder.aroma = (TextView) convertView.findViewById(R.id.aroma); holder.appearance = (TextView) convertView.findViewById(R.id.appearance); holder.taste = (TextView) convertView.findViewById(R.id.taste); holder.palate = (TextView) convertView.findViewById(R.id.palate); holder.overall = (TextView) convertView.findViewById(R.id.overall); holder.status = (TextView) convertView.findViewById(R.id.status); holder.comments = (TextView) convertView.findViewById(R.id.comments); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } // Bind the data OfflineRating item = getItem(position); holder.beerName.setText(item.getBeerName()); holder.total.setTag(item); if (item.getAroma() == null || item.getAppearance() == null && item.getTaste() == null || item.getPalate() == null || item.getOverall() == null) { holder.total.setText(""); } else { holder.total.setText(Float.toString(PostRatingCommand.calculateTotal(item.getAroma(), item.getAppearance(), item.getTaste(), item.getPalate(), item.getOverall()))); } holder.aroma.setText(item.getAroma() == null ? "" : Integer.toString(item.getAroma())); holder.appearance.setText(item.getAppearance() == null ? "" : Integer.toString(item.getAppearance())); holder.taste.setText(item.getTaste() == null ? "" : Integer.toString(item.getTaste())); holder.palate.setText(item.getPalate() == null ? "" : Integer.toString(item.getPalate())); holder.overall.setText(item.getOverall() == null ? "" : Integer.toString(item.getOverall())); holder.status.setText(getString(R.string.rate_offline_savedat, dateFormat.format(item.getTimeSaved()))); holder.comments.setText(item.getComments()); return convertView; } } protected static class ViewHolder { TextView beerName, total, aroma, appearance, taste, palate, overall, status, comments; } }