Java tutorial
/* * Copyright 2011 Google Inc. * Copyright 2011 Peter Kuterna * * 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 net.peterkuterna.android.apps.devoxxsched.ui; import net.peterkuterna.android.apps.devoxxsched.R; import net.peterkuterna.android.apps.devoxxsched.service.AbstractSyncService; import net.peterkuterna.android.apps.devoxxsched.service.AppEngineSyncService; import net.peterkuterna.android.apps.devoxxsched.service.CfpSyncManager; import net.peterkuterna.android.apps.devoxxsched.service.CfpSyncService; import net.peterkuterna.android.apps.devoxxsched.service.NewsSyncService; import net.peterkuterna.android.apps.devoxxsched.ui.phone.SessionDetailActivity; import net.peterkuterna.android.apps.devoxxsched.ui.phone.SessionsActivity; import net.peterkuterna.android.apps.devoxxsched.ui.phone.TwitterSearchActivity; import net.peterkuterna.android.apps.devoxxsched.ui.widget.ScrollableTabs; import net.peterkuterna.android.apps.devoxxsched.ui.widget.ScrollableTabsAdapter; import net.peterkuterna.android.apps.devoxxsched.util.AnalyticsUtils; import net.peterkuterna.android.apps.devoxxsched.util.DetachableResultReceiver; import net.peterkuterna.android.apps.devoxxsched.util.UIUtils; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentTransaction; import android.support.v4.view.ViewPager; import android.text.format.DateUtils; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; public class HomeActivity extends BaseMultiPaneActivity implements FragmentManager.OnBackStackChangedListener { private static final String TAG = "HomeActivity"; private static final long FIRST_TRIGGER = 30 * 60 * DateUtils.SECOND_IN_MILLIS; private FragmentManager mFragmentManager; private ViewPager mViewPager; private ViewGroup mTabsContainer; private ScrollableTabs mTabs; private HomePagerAdapter mAdapter; private boolean mDuringConference = false; private boolean mPauseBackStackWatcher = false; private SyncStatusUpdaterFragment mSyncStatusUpdaterFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mActivityHelper.onCreate(savedInstanceState); AnalyticsUtils.getInstance(this).trackPageView("/Home"); setContentView(R.layout.activity_home); mFragmentManager = getSupportFragmentManager(); mViewPager = (ViewPager) findViewById(R.id.viewpager); if (mViewPager != null) { mViewPager.setPageMargin(getResources().getDimensionPixelSize(R.dimen.viewpager_page_margin)); mViewPager.setPageMarginDrawable(R.drawable.viewpager_margin); mAdapter = new HomePagerAdapter(getSupportFragmentManager()); mViewPager.setAdapter(mAdapter); mTabsContainer = (ViewGroup) findViewById(R.id.viewpagerheader_container); mTabs = (ScrollableTabs) findViewById(R.id.viewpagerheader); mTabs.setAdapter(mAdapter); mViewPager.setOnPageChangeListener(mTabs); refreshPager(); } View v = findViewById(R.id.whats_on_stream); if (v != null) { v.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { AnalyticsUtils.getInstance(HomeActivity.this).trackEvent("Home Screen Dashboard", "Click", "Twitter Search Stream", 0); Intent intent = new Intent(HomeActivity.this, TwitterSearchActivity.class); startActivity(intent); } }); } final View closeButton = findViewById(R.id.close_button); if (closeButton != null) { closeButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { showHideDetail(false); } }); } mSyncStatusUpdaterFragment = (SyncStatusUpdaterFragment) mFragmentManager .findFragmentByTag(SyncStatusUpdaterFragment.TAG); if (mSyncStatusUpdaterFragment == null) { mSyncStatusUpdaterFragment = new SyncStatusUpdaterFragment(); mFragmentManager.beginTransaction().add(mSyncStatusUpdaterFragment, SyncStatusUpdaterFragment.TAG) .commit(); triggerRefresh(); final CfpSyncManager syncManager = new CfpSyncManager(this); syncManager.setSyncAlarm(FIRST_TRIGGER); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.home_menu_items, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_refresh: triggerRefresh(); return true; case R.id.menu_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; } return super.onOptionsItemSelected(item); } @Override public FragmentReplaceInfo onSubstituteFragmentForActivityLaunch(String activityClassName) { if (findViewById(R.id.session_detail_popup) != null) { if (SessionsActivity.class.getName().equals(activityClassName)) { showHideDetail(true); return new FragmentReplaceInfo(SessionsFragment.class, "sessions", R.id.fragment_container_session_detail); } else if (SessionDetailActivity.class.getName().equals(activityClassName)) { showHideDetail(true); return new FragmentReplaceInfo(SessionDetailFragment.class, "session_detail", R.id.fragment_container_session_detail); } } return null; } @Override public void onBeforeCommitReplaceFragment(FragmentManager fm, FragmentTransaction ft, Fragment fragment) { super.onBeforeCommitReplaceFragment(fm, ft, fragment); if (fragment instanceof SessionsFragment) { mPauseBackStackWatcher = true; if (fm.getBackStackEntryCount() > 0) { fm.popBackStackImmediate(); } mPauseBackStackWatcher = false; ft.addToBackStack(null); } else if (fragment instanceof SessionDetailFragment) { mPauseBackStackWatcher = true; if (fm.getBackStackEntryCount() > 0) { fm.popBackStackImmediate(); } mPauseBackStackWatcher = false; ft.addToBackStack(null); } } @Override public void onAfterCommitReplaceFragment(FragmentManager fm, FragmentTransaction ft, Fragment fragment) { super.onAfterCommitReplaceFragment(fm, ft, fragment); } @Override public void onBackStackChanged() { if (mPauseBackStackWatcher) { return; } if (mFragmentManager.getBackStackEntryCount() == 0) { showHideDetail(false); } } private void showHideDetail(boolean show) { final View detailPopup = findViewById(R.id.session_detail_popup); if (show != (detailPopup.getVisibility() == View.VISIBLE)) { detailPopup.setVisibility(show ? View.VISIBLE : View.GONE); if (!show) { Fragment f = mFragmentManager.findFragmentByTag("session_detail"); if (f != null) { mFragmentManager.beginTransaction().remove(f).commit(); } } } } private void triggerRefresh() { final Intent cfpIntent = new Intent(Intent.ACTION_SYNC, null, this, CfpSyncService.class); cfpIntent.putExtra(AbstractSyncService.EXTRA_STATUS_RECEIVER, mSyncStatusUpdaterFragment.mReceiver); startService(cfpIntent); final Intent newsIntent = new Intent(Intent.ACTION_SYNC, null, this, NewsSyncService.class); startService(newsIntent); final Intent appEngineIntent = new Intent(Intent.ACTION_SYNC, null, this, AppEngineSyncService.class); startService(appEngineIntent); } private void updateRefreshStatus(boolean refreshing) { mActionBarHelper.setRefreshActionItemState(refreshing); } public static class SyncStatusUpdaterFragment extends Fragment implements DetachableResultReceiver.Receiver { private static final String TAG = SyncStatusUpdaterFragment.class.getName(); private boolean mSyncing = false; private DetachableResultReceiver mReceiver = new DetachableResultReceiver(new Handler()); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); mReceiver.setReceiver(this); } @Override public void onReceiveResult(int resultCode, Bundle resultData) { HomeActivity activity = (HomeActivity) getSupportActivity(); if (activity == null) { return; } switch (resultCode) { case AbstractSyncService.STATUS_RUNNING: { mSyncing = true; break; } case AbstractSyncService.STATUS_FINISHED: { mSyncing = false; break; } case AbstractSyncService.STATUS_ERROR: { // Error happened down in SyncService, show as toast. mSyncing = false; // final String errorText = getString(R.string.toast_sync_error, // resultData // .getString(Intent.EXTRA_TEXT)); // Toast.makeText(activity, errorText, // Toast.LENGTH_LONG).show(); break; } } activity.updateRefreshStatus(mSyncing); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); ((HomeActivity) getActivity()).updateRefreshStatus(mSyncing); } } private void refreshPager() { final long currentTimeMillis = UIUtils.getCurrentTime(this); if (currentTimeMillis >= UIUtils.START_DAYS_IN_MILLIS[0] && currentTimeMillis < (UIUtils.START_DAYS_IN_MILLIS[UIUtils.NUMBER_DAYS - 1] + DateUtils.DAY_IN_MILLIS)) { mDuringConference = true; mFragmentManager.addOnBackStackChangedListener(this); } else { mDuringConference = false; mFragmentManager.removeOnBackStackChangedListener(this); } mTabsContainer.setVisibility(mDuringConference ? View.VISIBLE : View.GONE); mViewPager.setAdapter(mAdapter); mTabs.setAdapter(mAdapter); } private class HomePagerAdapter extends FragmentPagerAdapter implements ScrollableTabsAdapter { public HomePagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { switch (position) { case 0: return TwitterSearchFragment.newInstance(); case 1: return SessionScheduleItemsFragment.newInstance(UIUtils.getCurrentTime(HomeActivity.this)); } return null; } @Override public int getCount() { return mDuringConference ? 2 : 1; } @Override public TextView getTab(final int position, LinearLayout root) { final TextView indicator = (TextView) getLayoutInflater().inflate(R.layout.tab_indicator_home, null, false); indicator.setText(position == 0 ? R.string.title_twitter_stream : R.string.title_todays_starred); indicator.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { mViewPager.setCurrentItem(position); } }); return indicator; } } }