Java tutorial
/* * Copyright (C) 2010 Adam Nybck * * 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 se.anyro.tagtider; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import se.anyro.tagtider.model.Station; import se.anyro.tagtider.utils.Http; import se.anyro.tagtider.utils.RecentList; import se.anyro.tagtider.utils.StringUtils; import android.app.AlertDialog; import android.app.ListActivity; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.PackageInfo; import android.content.pm.PackageManager.NameNotFoundException; import android.content.res.AssetManager; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.View; import android.view.Window; import android.view.View.OnClickListener; import android.view.inputmethod.InputMethodManager; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.AdapterView.OnItemClickListener; public class MainActivity extends ListActivity { private static final String LAST_VERSION_CODE = "last_version_code"; private AutoCompleteTextView mStationView; private Station[] mStations; private List<String> mStationNames = new ArrayList<String>(); private AlertDialog mMessageDialog; private RecentList mRecentStations; private ArrayAdapter<String> mRecentStationsAdapter; private ArrayAdapter<String> mStationsAdapter; private SharedPreferences preferences; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); preferences = PreferenceManager.getDefaultSharedPreferences(this); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); loadStations(); setupAutocompletion(); setupButtonActions(); setupDialogs(); loadRecentStations(); Http.setVersionName(getVersionName()); oneTimeNotify(); } private void oneTimeNotify() { int lastVersionCode = preferences.getInt(LAST_VERSION_CODE, 0); if (lastVersionCode < 7) { showMessage(getString(R.string.one_time_notifier)); preferences.edit().putInt(LAST_VERSION_CODE, 7).commit(); } } private void loadStations() { AssetManager assetManager = getAssets(); InputStream inputStream = null; try { inputStream = assetManager.open("stations.json"); } catch (IOException e) { e.printStackTrace(); } String json = StringUtils.readTextFile(inputStream); try { JSONArray stations = new JSONArray(json); mStations = new Station[stations.length()]; for (int i = 0; i < stations.length(); ++i) { JSONObject station = stations.getJSONObject(i); mStationNames.add(station.getString("name")); mStations[i] = new Station(station); } } catch (JSONException e) { e.printStackTrace(); } } private void setupAutocompletion() { mStationsAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, mStationNames); mStationView = (AutoCompleteTextView) findViewById(R.id.station); mStationView.setAdapter(mStationsAdapter); mStationView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Hide the keyboard InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(mStationView.getWindowToken(), 0); } }); } private void setupButtonActions() { final Button showDeparturesButton = (Button) findViewById(R.id.departures); final Button showArrivalsButton = (Button) findViewById(R.id.arrivals); OnClickListener clickListener = new OnClickListener() { @Override public void onClick(View button) { // Check if the user wrote a valid station int selection = mStationNames.indexOf(mStationView.getText().toString()); if (selection >= 0) { mRecentStations.addItem(mStationView.getText().toString()); Station station = mStations[selection]; String type = Station.DEPARTURES; if (button == showArrivalsButton) type = Station.ARRIVIALS; // Show the arrivals or departures at this station Intent intent = new Intent(MainActivity.this, StationActivity.class); intent.putExtra("stationName", station.name); intent.putExtra("stationId", station.id); intent.putExtra("type", type); startActivity(intent); } } }; showDeparturesButton.setOnClickListener(clickListener); showArrivalsButton.setOnClickListener(clickListener); } private void setupDialogs() { mMessageDialog = new AlertDialog.Builder(this).setNeutralButton("Ok", null).create(); } private void loadRecentStations() { mRecentStations = new RecentList(4, "recent_station", preferences); mRecentStationsAdapter = new ArrayAdapter<String>(this, R.layout.station_row, mRecentStations.getList()); setListAdapter(mRecentStationsAdapter); } @Override protected void onResume() { super.onResume(); // Make sure the latest searched station is displayed mRecentStationsAdapter.notifyDataSetChanged(); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { // Temporary remove the adapter to prevent the drop down mStationView.setAdapter((ArrayAdapter<String>) null); TextView textView = (TextView) v; mStationView.setText(textView.getText()); mStationView.setAdapter(mStationsAdapter); } public void showMessage(String message) { mMessageDialog.setMessage(message); mMessageDialog.show(); } private int getVersionCode() { try { PackageInfo mPackageInfo = getPackageManager().getPackageInfo(getPackageName(), 0); return mPackageInfo.versionCode; } catch (NameNotFoundException e) { return 0; } } private String getVersionName() { try { PackageInfo mPackageInfo = getPackageManager().getPackageInfo(getPackageName(), 0); return mPackageInfo.versionName; } catch (NameNotFoundException e) { return "UNAVAILABLE"; } } }