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.util.ArrayList; import java.util.List; import android.content.Context; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; 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.ListAdapter; 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.FragmentArg; import com.googlecode.androidannotations.annotations.InstanceState; import com.googlecode.androidannotations.annotations.OptionsItem; import com.googlecode.androidannotations.annotations.OptionsMenu; import com.googlecode.androidannotations.annotations.ViewById; import com.ratebeer.android.R; import com.ratebeer.android.api.ApiMethod; import com.ratebeer.android.api.CommandFailureResult; import com.ratebeer.android.api.CommandSuccessResult; import com.ratebeer.android.api.command.GetUserCellarCommand; import com.ratebeer.android.api.command.GetUserCellarCommand.CellarBeer; import com.ratebeer.android.api.command.RemoveFromCellarCommand; import com.ratebeer.android.gui.components.RateBeerFragment; import com.ratebeer.android.gui.components.helpers.ArrayAdapter; import com.ratebeer.android.gui.fragments.ConfirmDialogFragment.OnDialogResult; import com.viewpagerindicator.TabPageIndicator; @EFragment(R.layout.fragment_cellarview) @OptionsMenu(R.menu.refresh) public class CellarViewFragment extends RateBeerFragment { private static final int MENU_REMOVE = 10; @FragmentArg @InstanceState protected int userId; @InstanceState protected ArrayList<CellarBeer> wants = null; @InstanceState protected ArrayList<CellarBeer> haves = null; @ViewById protected ViewPager pager; @ViewById(R.id.wantsview) protected ListView wantsView; @ViewById(R.id.havesview) protected ListView havesView; @ViewById protected TabPageIndicator titles; private ListAdapter lastUsedListView = null; public CellarViewFragment() { } @AfterViews public void init() { if (pager != null) { // Phone layout (using a pager to show the two lists): we still need to load the layout pager.setAdapter(new CellarPagerAdapter()); titles.setViewPager(pager); } wantsView.setOnItemClickListener(onCellarBeerClick); havesView.setOnItemClickListener(onCellarBeerClick); registerForContextMenu(wantsView); registerForContextMenu(havesView); if (wants != null && haves != null) { publishCellar(wants, haves); } else { refreshCellar(); } } @SuppressWarnings("unchecked") @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.add(Menu.NONE, MENU_REMOVE, MENU_REMOVE, R.string.cellar_remove); lastUsedListView = ((AdapterView<ListAdapter>) v).getAdapter(); } @Override public boolean onContextItemSelected(android.view.MenuItem item) { AdapterContextMenuInfo acmi = (AdapterContextMenuInfo) item.getMenuInfo(); final CellarBeer beer = (CellarBeer) lastUsedListView.getItem(acmi.position); new ConfirmDialogFragment(new OnDialogResult() { @Override public void onConfirmed() { removeBeerFromCellar(beer); } }, R.string.cellar_confirmremoval, beer.beerName).show(getFragmentManager(), "dialog"); return super.onContextItemSelected(item); } @OptionsItem(R.id.menu_refresh) protected void refreshCellar() { execute(new GetUserCellarCommand(getUser(), userId)); } protected void removeBeerFromCellar(CellarBeer beer) { execute(new RemoveFromCellarCommand(getUser(), beer.beerId)); } private OnItemClickListener onCellarBeerClick = new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { CellarBeer item = ((CellarAdapter) parent.getAdapter()).getItem(position); load(BeerViewFragment_.builder().beerId(item.beerId).beerName(item.beerName).build()); } }; @Override public void onTaskSuccessResult(CommandSuccessResult result) { if (result.getCommand().getMethod() == ApiMethod.GetUserCellar) { GetUserCellarCommand ucc = (GetUserCellarCommand) result.getCommand(); publishCellar(ucc.getWants(), ucc.getHaves()); } else if (result.getCommand().getMethod() == ApiMethod.RemoveFromCellar) { // NOTE: No feedback, so we assume that the removal was actually successful and request a refresh refreshCellar(); } } private void publishCellar(ArrayList<CellarBeer> wants, ArrayList<CellarBeer> haves) { this.wants = wants; this.haves = haves; // Updated the list view adapters (which might be wrapped in a CellarPagerAdapter) if (wantsView.getAdapter() == null) { wantsView.setAdapter(new CellarAdapter(getActivity(), wants)); } else { ((CellarAdapter) wantsView.getAdapter()).replace(wants); } if (havesView.getAdapter() == null) { havesView.setAdapter(new CellarAdapter(getActivity(), haves)); } else { ((CellarAdapter) havesView.getAdapter()).replace(haves); } } @Override public void onTaskFailureResult(CommandFailureResult result) { publishException(null, result.getException()); } private class CellarAdapter extends ArrayAdapter<CellarBeer> { public CellarAdapter(Context context, List<CellarBeer> objects) { super(context, objects); } @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_cellaritem, null); holder = new ViewHolder(); holder.beer = (TextView) convertView.findViewById(R.id.beer); holder.memo = (TextView) convertView.findViewById(R.id.memo); holder.quantity = (TextView) convertView.findViewById(R.id.quantity); holder.vintage = (TextView) convertView.findViewById(R.id.vintage); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } // Bind the data CellarBeer item = getItem(position); holder.beer.setText(item.beerName); holder.memo.setText(item.memo); holder.memo.setVisibility(item.memo == null || item.memo.equals("") ? View.GONE : View.VISIBLE); holder.quantity.setText(item.quantity); holder.quantity .setVisibility(item.quantity == null || item.quantity.equals("") ? View.GONE : View.VISIBLE); holder.vintage.setText(item.vintage); holder.vintage .setVisibility(item.vintage == null || item.vintage.equals("") ? View.GONE : View.VISIBLE); return convertView; } } protected static class ViewHolder { TextView beer, memo, quantity, vintage; } private class CellarPagerAdapter extends PagerAdapter { public CellarPagerAdapter() { LayoutInflater inflater = getActivity().getLayoutInflater(); wantsView = (ListView) inflater.inflate(R.layout.fragment_pagerlist, null); havesView = (ListView) inflater.inflate(R.layout.fragment_pagerlist, null); } @Override public int getCount() { return 2; } @Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return getActivity().getString(R.string.cellar_wants).toUpperCase(); case 1: return getActivity().getString(R.string.cellar_haves).toUpperCase(); } return null; } @Override public Object instantiateItem(View container, int position) { switch (position) { case 0: ((ViewPager) container).addView(wantsView, 0); return wantsView; case 1: ((ViewPager) container).addView(havesView, 0); return havesView; } return null; } @Override public void destroyItem(View container, int position, Object object) { ((ViewPager) container).removeView((View) object); } @Override public boolean isViewFromObject(View view, Object object) { return view == (View) object; } } }