Java tutorial
/* * Copyright 2014 MTRamin * * 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 de.mtrstudios.nflpickem.UI.Highscores; import android.app.ActionBar; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.v13.app.FragmentPagerAdapter; import android.support.v4.app.NavUtils; import android.support.v4.view.ViewPager; import android.view.Menu; import android.view.MenuItem; import butterknife.ButterKnife; import butterknife.InjectView; import de.mtrstudios.nflpickem.R; import de.mtrstudios.nflpickem.UI.BaseActivity; import de.mtrstudios.nflpickem.UI.Login.LoginActivity; import de.mtrstudios.nflpickem.UI.Settings.SettingsActivity; /** * Activity that shows a list of highscores to the user * Uses a ViewPager to display week-by-week highscores * The highscore lists are displayed by HighscoreFragments */ public class HighscoresActivity extends BaseActivity implements ActionBar.TabListener, HighscoresFragment.OnFragmentInteractionListener { /** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link FragmentPagerAdapter} derivative, which will keep every * loaded fragment in memory. If this becomes too memory intensive, it * may be best to switch to a * {@link android.support.v13.app.FragmentStatePagerAdapter}. */ SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ @InjectView(R.id.pager) ViewPager mViewPager; @Override public void onFragmentInteraction(Uri uri) { } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_highscores); ButterKnife.inject(this); // Set up the action bar. final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.setTitle(getString(R.string.highscores)); actionBar.setDisplayHomeAsUpEnabled(true); // Create the adapter that will return a fragment for each of the three // primary sections of the activity. mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager()); mSectionsPagerAdapter.setWeeks(appData.getSeasonInfo().getWeek()); // Set up the ViewPager with the sections adapter. mViewPager.setAdapter(mSectionsPagerAdapter); // When swiping between different sections, select the corresponding // tab. We can also use ActionBar.Tab#select() to do this if we have // a reference to the Tab. mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { // Create a tab with text corresponding to the page title defined by // the adapter. Also specify this Activity object, which implements // the TabListener interface, as the callback (listener) for when // this tab is selected. actionBar .addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this)); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.highscores, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. Intent intent; switch (item.getItemId()) { case R.id.action_settings: intent = new Intent(this, SettingsActivity.class); startActivity(intent); return true; case R.id.action_logout: appData.signOut(); // Start Log-In Activity intent = new Intent(this, LoginActivity.class); startActivity(intent); finish(); return true; case android.R.id.home: NavUtils.navigateUpFromSameTask(this); return true; default: return super.onOptionsItemSelected(item); } } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link android.support.v13.app.FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter { private int mWeeks; public SectionsPagerAdapter(FragmentManager fm) { super(fm); } public void setWeeks(int weeks) { mWeeks = weeks; } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. int week = 0; if (position != 0) { week = mWeeks - (position - 1); } return HighscoresFragment.newInstance(week); } @Override public int getCount() { // Show pages = number of current week + overall page return mWeeks + 1; } @Override public CharSequence getPageTitle(int position) { // Page title order is always 'Overall' followed by weeks in descending order switch (position) { case 0: return getString(R.string.highscores_overall); default: int weekNumber = mWeeks - (position - 1); return getString(R.string.week) + " " + weekNumber; } } } }