Java tutorial
/* * Copyright 2012 Google Inc. * * 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 com.gdgdevfest.android.apps.devfestbcn.ui; import static com.gdgdevfest.android.apps.devfestbcn.util.LogUtils.LOGD; import static com.gdgdevfest.android.apps.devfestbcn.util.LogUtils.makeLogTag; import android.accounts.Account; import android.annotation.TargetApi; import android.app.SearchManager; import android.content.ContentResolver; import android.content.Intent; import android.content.SyncStatusObserver; import android.os.Build; import android.os.Bundle; import android.os.StrictMode; 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.MenuItemCompat; import android.support.v4.view.ViewPager; import android.support.v7.app.ActionBar; import android.text.TextUtils; import android.view.Menu; import android.view.MenuItem; import android.widget.SearchView; import com.gdgdevfest.android.apps.devfestbcn.R; import com.gdgdevfest.android.apps.devfestbcn.provider.ScheduleContract; import com.gdgdevfest.android.apps.devfestbcn.sync.SyncHelper; import com.gdgdevfest.android.apps.devfestbcn.util.AccountUtils; import com.gdgdevfest.android.apps.devfestbcn.util.HelpUtils; import com.gdgdevfest.android.apps.devfestbcn.util.UIUtils; import com.google.analytics.tracking.android.EasyTracker; import com.google.android.gms.auth.GoogleAuthUtil; public class HomeActivity extends BaseActivity implements ActionBar.TabListener, ViewPager.OnPageChangeListener { private static final String TAG = makeLogTag(HomeActivity.class); public static final String EXTRA_DEFAULT_TAB = "com.gdgdevfest.android.apps.devfestbcn.extra.DEFAULT_TAB"; public static final String TAB_EXPLORE = "explore"; private Object mSyncObserverHandle; private SocialStreamFragment mSocialStreamFragment; private ViewPager mViewPager; private Menu mOptionsMenu; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (isFinishing()) { return; } if (android.os.Build.VERSION.SDK_INT > 9) { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } UIUtils.enableDisableActivitiesByFormFactor(this); setContentView(R.layout.activity_home); FragmentManager fm = getSupportFragmentManager(); setTitle(R.string.app_name); mViewPager = (ViewPager) findViewById(R.id.pager); String homeScreenLabel; if (mViewPager != null) { // Phone setup mViewPager.setAdapter(new HomePagerAdapter(getSupportFragmentManager())); mViewPager.setOnPageChangeListener(this); mViewPager.setPageMarginDrawable(R.drawable.grey_border_inset_lr); mViewPager.setPageMargin(getResources().getDimensionPixelSize(R.dimen.page_margin_width)); final ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.addTab(actionBar.newTab().setText(R.string.title_my_schedule).setTabListener(this)); actionBar.addTab(actionBar.newTab().setText(R.string.title_explore).setTabListener(this)); actionBar.addTab(actionBar.newTab().setText(R.string.title_stream).setTabListener(this)); setHasTabs(); if (getIntent() != null && TAB_EXPLORE.equals(getIntent().getStringExtra(EXTRA_DEFAULT_TAB)) && savedInstanceState == null) { mViewPager.setCurrentItem(1); } homeScreenLabel = getString(R.string.title_my_schedule); } else { mSocialStreamFragment = (SocialStreamFragment) fm.findFragmentById(R.id.fragment_stream); homeScreenLabel = "Home"; } getSupportActionBar().setHomeButtonEnabled(false); triggerRefresh(); EasyTracker.getTracker().sendView(homeScreenLabel); LOGD("Tracker", homeScreenLabel); } @Override protected void onDestroy() { super.onDestroy(); } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { 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 onPageScrolled(int i, float v, int i1) { } @Override public void onPageSelected(int position) { getSupportActionBar().setSelectedNavigationItem(position); int titleId = -1; switch (position) { case 0: titleId = R.string.title_my_schedule; break; case 1: titleId = R.string.title_explore; break; case 2: titleId = R.string.title_stream; break; } String title = getString(titleId); EasyTracker.getTracker().sendView(title); LOGD("Tracker", title); } @Override public void onPageScrollStateChanged(int i) { } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Since the pager fragments don't have known tags or IDs, the only way to persist the // reference is to use putFragment/getFragment. Remember, we're not persisting the exact // Fragment instance. This mechanism simply gives us a way to persist access to the // 'current' fragment instance for the given fragment (which changes across orientation // changes). // // The outcome of all this is that the "Refresh" menu button refreshes the stream across // orientation changes. if (mSocialStreamFragment != null) { getSupportFragmentManager().putFragment(outState, "stream_fragment", mSocialStreamFragment); } } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); if (mSocialStreamFragment == null) { mSocialStreamFragment = (SocialStreamFragment) getSupportFragmentManager() .getFragment(savedInstanceState, "stream_fragment"); } } private class HomePagerAdapter extends FragmentPagerAdapter { public HomePagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { switch (position) { case 0: return new ScheduleFragment(); case 1: return new ExploreFragment(); case 2: return (mSocialStreamFragment = new SocialStreamFragment()); } return null; } @Override public int getCount() { return 3; } } @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); mOptionsMenu = menu; getMenuInflater().inflate(R.menu.home, menu); MenuItem searchItem = menu.findItem(R.id.menu_search); if (searchItem != null && UIUtils.hasHoneycomb()) { SearchView searchView = (SearchView) searchItem.getActionView(); if (searchView != null) { SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE); searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); searchView.setQueryRefinementEnabled(true); } } return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_refresh: triggerRefresh(); return true; case R.id.menu_search: if (!UIUtils.hasHoneycomb()) { startSearch(null, false, Bundle.EMPTY, false); return true; } break; case R.id.menu_about: HelpUtils.showAbout(this); return true; case R.id.menu_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; case R.id.menu_sign_out: AccountUtils.signOut(this); finish(); return true; } return super.onOptionsItemSelected(item); } private void triggerRefresh() { SyncHelper.requestManualSync(AccountUtils.getChosenAccount(this)); if (mSocialStreamFragment != null) { mSocialStreamFragment.refresh(); } } @Override protected void onPause() { super.onPause(); if (mSyncObserverHandle != null) { ContentResolver.removeStatusChangeListener(mSyncObserverHandle); mSyncObserverHandle = null; } } @Override protected void onResume() { super.onResume(); mSyncStatusObserver.onStatusChanged(0); // Watch for sync state changes final int mask = ContentResolver.SYNC_OBSERVER_TYPE_PENDING | ContentResolver.SYNC_OBSERVER_TYPE_ACTIVE; mSyncObserverHandle = ContentResolver.addStatusChangeListener(mask, mSyncStatusObserver); // Refresh options menu. Menu item visibility could be altered by user preferences. supportInvalidateOptionsMenu(); } void setRefreshActionButtonState(boolean refreshing) { if (mOptionsMenu == null) { return; } final MenuItem refreshItem = mOptionsMenu.findItem(R.id.menu_refresh); if (refreshItem != null) { if (refreshing) { MenuItemCompat.setActionView(refreshItem, R.layout.actionbar_indeterminate_progress); } else { MenuItemCompat.setActionView(refreshItem, null); } } } private SyncStatusObserver mSyncStatusObserver = new SyncStatusObserver() { @Override public void onStatusChanged(int which) { runOnUiThread(new Runnable() { @Override public void run() { String accountName = AccountUtils.getChosenAccountName(HomeActivity.this); if (TextUtils.isEmpty(accountName)) { setRefreshActionButtonState(false); return; } Account account = new Account(accountName, GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE); boolean syncActive = ContentResolver.isSyncActive(account, ScheduleContract.CONTENT_AUTHORITY); boolean syncPending = ContentResolver.isSyncPending(account, ScheduleContract.CONTENT_AUTHORITY); setRefreshActionButtonState(syncActive || syncPending); } }); } }; }