Java tutorial
/* * The MIT License * * Copyright (c) 2015 Petar Petrov * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package net.vexelon.bgrates.ui.activities; import java.util.Calendar; import java.util.Locale; import android.app.ActionBar; import android.app.Activity; import android.app.AlarmManager; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v13.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.view.Menu; import android.view.MenuItem; import net.vexelon.bgrates.Defs; import net.vexelon.bgrates.R; import net.vexelon.bgrates.services.RateService; import net.vexelon.bgrates.ui.events.Notifications; import net.vexelon.bgrates.ui.events.NotificationsListener; import net.vexelon.bgrates.ui.fragments.AbstractFragment; import net.vexelon.bgrates.ui.fragments.ConvertFragment; import net.vexelon.bgrates.ui.fragments.CurrenciesFragment; public class MainActivity extends Activity implements ActionBar.TabListener, NotificationsListener { /** * 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; private PendingIntent pendingIntent;// // /** * The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager; Menu mMenu; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Set up the action bar. final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.setDisplayShowTitleEnabled(true); actionBar.setDisplayShowHomeEnabled(false); actionBar.setTitle(R.string.app_name_pure); // actionBar.setDisplayUseLogoEnabled(true); // actionBar.setLogo(R.drawable.icon); // Create the adapter that will return a fragment for each of the three // primary sections of the activity. mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); 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)); } // load default values PreferenceManager.setDefaultValues(this, R.xml.preferences, false); // Start Service startService(); } public void startService() { Intent myIntent = new Intent(MainActivity.this, RateService.class); pendingIntent = PendingIntent.getService(MainActivity.this, 0, myIntent, 0); AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 30); long initialStartTimeout = calendar.getTimeInMillis(); alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, initialStartTimeout, Defs.NOTIFY_INTERVAL, pendingIntent); } public void cancelService() { AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); alarmManager.cancel(pendingIntent); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); mMenu = 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. int id = item.getItemId(); if (id == R.id.action_settings) { Intent intent = new Intent(this, PrefsActivity.class); startActivity(intent); return true; } 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) { } @Override public void onNotification(Notifications event) { switch (event) { case UPDATE_RATES_DONE: // setRefreshActionButtonState(false); break; } } private Fragment getCurrentFragment() { String fragmentName = "android:switcher:" + mViewPager.getId() + ":" + mViewPager.getCurrentItem(); return getFragmentManager().findFragmentByTag(fragmentName); } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fragmentManager) { super(fragmentManager); } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a PlaceholderFragment (defined as a static inner class // below). Fragment fragment = PlaceholderFragment.newInstance(position + 1); ((AbstractFragment) fragment).addListener(MainActivity.this); return fragment; } @Override public int getCount() { // Show 2 total pages. return 2; } @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); switch (position) { case 0: return getString(R.string.tab_title_currencies).toUpperCase(l); case 1: return getString(R.string.tab_title_convert).toUpperCase(l); } return null; } } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; /** * Returns a new instance of this fragment for the given section * number. */ public static Fragment newInstance(int sectionNumber) { AbstractFragment fragment = null; switch (sectionNumber) { case 1: fragment = new CurrenciesFragment(); break; case 2: fragment = new ConvertFragment(); break; } if (fragment != null) { Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); } return fragment; } } }