Java tutorial
/* Braille BlackJack - An android program that aims to teach Braille Numbers is a fun way by playing the * game blackjack * * Copyright (C) 2015 Hussein AlAmeer, and Tu Truong * * This file is part of Braille BlackJack. * * Braille BlackJack 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. * * Braille BlackJack 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 finalproject.ece558.edu.pdx.ece.brailleblackjack; import android.app.Fragment; import android.support.v4.app.FragmentManager; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.app.FragmentActivity; import android.support.v4.app.NavUtils; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.Menu; import android.view.MenuItem; /** * This activity class represents the Learn Braille part of the app. It shows images/cards to teach * braille characters to a user by using a pager and LearnBrailleFragment to house the cards in. * * Demonstrates a "screen-slide" animation using a {@link ViewPager}. Because {@link ViewPager} * automatically plays such an animation when calling {@link ViewPager#setCurrentItem(int)}, there * isn't any animation-specific code in this sample. * * <p>This sample shows a "next" button that advances the user to the next step in a wizard, * animating the current screen out (to the left) and the next screen in (from the right). The * reverse animation is played when the user presses the "previous" button.</p> * * @see LearnBrailleFragment */ public class LearnBrailleActivity extends FragmentActivity { /* The number of pages (wizard steps) to show in this demo. */ private static final int NUM_PAGES = 4; /** * The pager widget, which handles animation and allows swiping horizontally to access previous * and next wizard steps. */ private ViewPager mPager; /* The pager adapter, which provides the pages to the view pager widget. */ private PagerAdapter mPagerAdapter; /** * Start the LearnBraillePagerAdapter * @param savedInstanceState Bundle object of any saved instances */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_learn_braille); // Instantiate a ViewPager and a PagerAdapter. mPager = (ViewPager) findViewById(R.id.pager); mPagerAdapter = new LearnBraillePagerAdapter(getSupportFragmentManager()); mPager.setAdapter(mPagerAdapter); mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // reset the action bar actions since they are dependent // on which page is currently active. invalidateOptionsMenu(); } }); } /** * Create the action menu to provide buttons to navigate the Pager * @param menu Menu object * @return Boolean true */ @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.menu_main, menu); // Add/enable previous button depending on which page is active // is currently selected. MenuItem prev_item = menu.add(Menu.NONE, R.id.action_previous, Menu.NONE, R.string.action_previous); prev_item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT); menu.findItem(R.id.action_previous).setEnabled(mPager.getCurrentItem() > 0); // Add either a "next" or "finished" button to the action bar, depending on which page // is currently active. MenuItem next_item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE, (mPager.getCurrentItem() == mPagerAdapter.getCount() - 1) ? R.string.action_finish : R.string.action_next); next_item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT); menu.findItem(R.id.action_next).setEnabled(!(mPager.getCurrentItem() == 3)); menu.findItem(R.id.action_next).setEnabled(mPager.getCurrentItem() < 3); return true; } /** * Handler of a menu button click * @param item MenuItem object * @return Boolean true */ @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // Navigate back to the main activity NavUtils.navigateUpTo(this, new Intent(this, MainActivity.class)); return true; case R.id.action_previous: // Go to the previous step in the wizard. If there is no previous step, // setCurrentItem will do nothing. mPager.setCurrentItem(mPager.getCurrentItem() - 1); return true; case R.id.action_next: // Advance to the next step in the wizard. If there is no next step, setCurrentItem // will do nothing. mPager.setCurrentItem(mPager.getCurrentItem() + 1); return true; } return super.onOptionsItemSelected(item); } /** * A simple pager adapter that represents 5 {@link LearnBrailleFragment} objects, in * sequence. */ private class LearnBraillePagerAdapter extends FragmentStatePagerAdapter { public LearnBraillePagerAdapter(FragmentManager fm) { super(fm); } @Override public android.support.v4.app.Fragment getItem(int position) { return LearnBrailleFragment.create(position); } @Override public int getCount() { return NUM_PAGES; } } }