Java tutorial
/*** Copyright (c) 2011 CommonsWare, LLC 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 com.commonsware.android.eu4you; import android.support.v4.app.ListFragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; public class CountriesFragment extends ListFragment { static private ArrayList<Country> EU = new ArrayList<Country>(); static private final String STATE_CHECKED = "com.commonsware.android.eu4you.STATE_CHECKED"; private CountryListener listener = null; static { EU.add(new Country(R.string.austria, R.drawable.austria, R.string.austria_url)); EU.add(new Country(R.string.belgium, R.drawable.belgium, R.string.belgium_url)); EU.add(new Country(R.string.bulgaria, R.drawable.bulgaria, R.string.bulgaria_url)); EU.add(new Country(R.string.cyprus, R.drawable.cyprus, R.string.cyprus_url)); EU.add(new Country(R.string.czech_republic, R.drawable.czech_republic, R.string.czech_republic_url)); EU.add(new Country(R.string.denmark, R.drawable.denmark, R.string.denmark_url)); EU.add(new Country(R.string.estonia, R.drawable.estonia, R.string.estonia_url)); EU.add(new Country(R.string.finland, R.drawable.finland, R.string.finland_url)); EU.add(new Country(R.string.france, R.drawable.france, R.string.france_url)); EU.add(new Country(R.string.germany, R.drawable.germany, R.string.germany_url)); EU.add(new Country(R.string.greece, R.drawable.greece, R.string.greece_url)); EU.add(new Country(R.string.hungary, R.drawable.hungary, R.string.hungary_url)); EU.add(new Country(R.string.ireland, R.drawable.ireland, R.string.ireland_url)); EU.add(new Country(R.string.italy, R.drawable.italy, R.string.italy_url)); EU.add(new Country(R.string.latvia, R.drawable.latvia, R.string.latvia_url)); EU.add(new Country(R.string.lithuania, R.drawable.lithuania, R.string.lithuania_url)); EU.add(new Country(R.string.luxembourg, R.drawable.luxembourg, R.string.luxembourg_url)); EU.add(new Country(R.string.malta, R.drawable.malta, R.string.malta_url)); EU.add(new Country(R.string.netherlands, R.drawable.netherlands, R.string.netherlands_url)); EU.add(new Country(R.string.poland, R.drawable.poland, R.string.poland_url)); EU.add(new Country(R.string.portugal, R.drawable.portugal, R.string.portugal_url)); EU.add(new Country(R.string.romania, R.drawable.romania, R.string.romania_url)); EU.add(new Country(R.string.slovakia, R.drawable.slovakia, R.string.slovakia_url)); EU.add(new Country(R.string.slovenia, R.drawable.slovenia, R.string.slovenia_url)); EU.add(new Country(R.string.spain, R.drawable.spain, R.string.spain_url)); EU.add(new Country(R.string.sweden, R.drawable.sweden, R.string.sweden_url)); EU.add(new Country(R.string.united_kingdom, R.drawable.united_kingdom, R.string.united_kingdom_url)); } @Override public void onActivityCreated(Bundle state) { super.onActivityCreated(state); setListAdapter(new CountryAdapter()); if (state != null) { int position = state.getInt(STATE_CHECKED, -1); if (position > -1) { getListView().setItemChecked(position, true); } } } @Override public void onListItemClick(ListView l, View v, int position, long id) { l.setItemChecked(position, true); if (listener != null) { listener.onCountrySelected(EU.get(position)); } } @Override public void onSaveInstanceState(Bundle state) { state.putInt(STATE_CHECKED, getListView().getCheckedItemPosition()); } public void setCountryListener(CountryListener listener) { this.listener = listener; } public void enablePersistentSelection() { getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); } class CountryAdapter extends ArrayAdapter<Country> { CountryAdapter() { super(getActivity(), R.layout.row, R.id.name, EU); } @Override public View getView(int position, View convertView, ViewGroup parent) { CountryWrapper wrapper = null; if (convertView == null) { convertView = LayoutInflater.from(getActivity()).inflate(R.layout.row, null); wrapper = new CountryWrapper(convertView); convertView.setTag(wrapper); } else { wrapper = (CountryWrapper) convertView.getTag(); } wrapper.populateFrom(getItem(position)); return (convertView); } } static class CountryWrapper { private TextView name = null; private ImageView flag = null; private View row = null; CountryWrapper(View row) { this.row = row; name = (TextView) row.findViewById(R.id.name); flag = (ImageView) row.findViewById(R.id.flag); } TextView getName() { return (name); } ImageView getFlag() { return (flag); } void populateFrom(Country nation) { getName().setText(nation.name); getFlag().setImageResource(nation.flag); } } }