Java tutorial
/* * Copyright (C) 2009 Elliot Glaysher. * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package org.elliotglaysher.lifecounter; import org.elliotglaysher.lifecounter.coin2d.Coin2DActivity; import org.elliotglaysher.lifecounter.coin2d.Coin2DActivityHC; import org.elliotglaysher.lifecounter.widgets.LifeLayout; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.os.Build; import android.os.Bundle; import android.os.PowerManager; import android.preference.PreferenceManager; import android.support.v4.view.MenuCompat; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; public class LifeCounter extends Activity { private int numPlayers; private final LifeLayout lifeLayout[] = new LifeLayout[Constants.MAX_PLAYERS]; private SharedPreferences sharedPreferences; private PowerManager.WakeLock wakeLock; // Defined in Honeycomb SDK, but we want to be compatible. public static final int SHOW_AS_ACTION_IF_ROOM = 1; public static final int SHOW_AS_ACTION_WITH_TEXT = 4; public static final int SHOW_AS_ACTION = SHOW_AS_ACTION_IF_ROOM | SHOW_AS_ACTION_WITH_TEXT; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); setupLayouts(); if (savedInstanceState != null) { restoreModelsFromBundle(savedInstanceState); } // Prevent the screen from totally going to sleep... final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); wakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag"); newGame(); } @Override protected void onResume() { super.onResume(); if (numPlayers != getNumPlayersFromPreferences()) { // The order of opponents has been switched. Rehook all this stuff // up. numberPlayersChanged(); } for (int i = 0; i < Constants.MAX_PLAYERS; ++i) { if (lifeLayout[i] != null) { lifeLayout[i].setTheme(sharedPreferences.getString(Constants.THEME_PREFERENCE_KEY[i], "Black")); lifeLayout[i].setName(sharedPreferences.getString(Constants.NAME_PREFERENCE_KEY[i], getString(Constants.DEFAULT_NAME_KEY[i]))); } } wakeLock.acquire(); } @Override protected void onPause() { super.onPause(); wakeLock.release(); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); restoreModelsFromBundle(savedInstanceState); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); saveModelsToBundle(outState); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); MenuCompat.setShowAsAction(menu.findItem(R.id.coin_menu), SHOW_AS_ACTION); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.new_game_menu: newGame(); return true; case R.id.coin_menu: commitPendingChanges(); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) { startActivity(new Intent(this, Coin2DActivity.class)); } else { startActivity(new Intent(this, Coin2DActivityHC.class)); } break; case R.id.settings_menu: commitPendingChanges(); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) { startActivity(new Intent(this, Settings.class)); } else { startActivity(new Intent(this, SettingsHC.class)); } return true; case R.id.about_menu: commitPendingChanges(); showAboutBox(); return true; } return super.onOptionsItemSelected(item); } private void showAboutBox() { new AlertDialog.Builder(this).setTitle(R.string.about_title).setIcon(R.drawable.icon) .setView(getLayoutInflater().inflate(R.layout.about, null, false)) .setPositiveButton(R.string.ok_label, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }).show(); } private void newGame() { for (int i = 0; i < Constants.MAX_PLAYERS; ++i) { if (lifeLayout[i] != null) { lifeLayout[i].newGame(); } } } private void commitPendingChanges() { for (int i = 0; i < Constants.MAX_PLAYERS; ++i) { if (lifeLayout[i] != null) { lifeLayout[i].commitPendingChanges(); } } } private void numberPlayersChanged() { Bundle b = new Bundle(); saveModelsToBundle(b); setupLayouts(); restoreModelsFromBundle(b); } private void setupLayouts() { numPlayers = getNumPlayersFromPreferences(); switch (numPlayers) { case 1: setContentView(R.layout.main_1_player); break; case 2: setContentView(R.layout.main_2_player); break; case 3: setContentView(R.layout.main_3_player); break; case 4: setContentView(R.layout.main_4_player); break; default: setContentView(R.layout.main_2_player); break; } lifeLayout[0] = (LifeLayout) findViewById(R.id.player_1_layout); lifeLayout[1] = (LifeLayout) findViewById(R.id.player_2_layout); lifeLayout[2] = (LifeLayout) findViewById(R.id.player_3_layout); lifeLayout[3] = (LifeLayout) findViewById(R.id.player_4_layout); } private int getNumPlayersFromPreferences() { try { return Integer.parseInt(sharedPreferences.getString(Constants.NUM_PLAYERS_KEY, "2")); } catch (NumberFormatException e) { return 2; } } private void saveModelsToBundle(Bundle outState) { for (int i = 0; i < Constants.MAX_PLAYERS; ++i) { if (lifeLayout[i] != null) { outState.putSerializable(Constants.MODEL_SAVE_KEY[i], lifeLayout[i].getModelForSaving()); } } } private void restoreModelsFromBundle(Bundle savedInstanceState) { for (int i = 0; i < Constants.MAX_PLAYERS; ++i) { if (lifeLayout[i] != null && savedInstanceState.containsKey(Constants.MODEL_SAVE_KEY[i])) { lifeLayout[i].setModelFromSave( (LifeModel) savedInstanceState.getSerializable(Constants.MODEL_SAVE_KEY[i])); } } } }