Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * 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.example.android.contactslist.ui; import android.app.ActionBar; import android.app.ActionBar.Tab; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.app.SearchManager; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import com.example.android.contactslist.BuildConfig; import com.example.android.contactslist.R; import com.example.android.contactslist.util.ContactsConstants; import com.example.android.contactslist.util.Utils; /** * FragmentActivity to hold the main {@link ContactsListFragment}. On larger screen devices which * can fit two panes also load {@link ContactDetailFragment}. */ public class ContactsActivity extends FragmentActivity implements ContactsListFragment.OnContactsInteractionListener, ActionBar.TabListener { // Defines a tag for identifying log entries private static final String TAG = "ContactsListActivity"; private ContactDetailFragment mContactDetailFragment; // If true, this is a larger screen device which fits two panes private boolean isTwoPaneLayout; // True if this activity instance is a search result view (used on pre-HC devices that load // search results in a separate instance of the activity rather than loading results in-line // as the query is typed. private boolean isSearchResultView = false; @Override protected void onCreate(Bundle savedInstanceState) { if (BuildConfig.DEBUG) { Utils.enableStrictMode(); } super.onCreate(savedInstanceState); // Set main content view. On smaller screen devices this is a single pane view with one // fragment. One larger screen devices this is a two pane view with two fragments. setContentView(R.layout.activity_main); final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.addTab(actionBar.newTab().setText(R.string.people).setTabListener(this)); actionBar.addTab(actionBar.newTab().setText(R.string.call_history).setTabListener(this)); // Check if two pane bool is set based on resource directories isTwoPaneLayout = getResources().getBoolean(R.bool.has_two_panes); if (isTwoPaneLayout) { // If two pane layout, locate the contact detail fragment mContactDetailFragment = (ContactDetailFragment) getSupportFragmentManager() .findFragmentById(R.id.contact_detail); } } /** * This interface callback lets the main contacts list fragment notify * this activity that a contact has been selected. * * @param contactUri The contact Uri to the selected contact. */ @Override public void onContactSelected(Uri contactUri) { if (isTwoPaneLayout && mContactDetailFragment != null) { // If two pane layout then update the detail fragment to show the selected contact mContactDetailFragment.setContact(contactUri); } else { // Otherwise single pane layout, start a new ContactDetailActivity with // the contact Uri Intent intent = new Intent(this, ContactDetailActivity.class); intent.setData(contactUri); startActivity(intent); } } /** * This interface callback lets the main contacts list fragment notify * this activity that a contact is no longer selected. */ @Override public void onSelectionCleared() { if (isTwoPaneLayout && mContactDetailFragment != null) { mContactDetailFragment.setContact(null); } } @Override public boolean onSearchRequested() { // Don't allow another search if this activity instance is already showing // search results. Only used pre-HC. return !isSearchResultView && super.onSearchRequested(); } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { switch (tab.getPosition()) { case 0: if (Intent.ACTION_SEARCH.equals(getIntent().getAction())) { String searchQuery = getIntent().getStringExtra(SearchManager.QUERY); ContactsListFragment mContactsListFragment = (ContactsListFragment) getSupportFragmentManager() .findFragmentByTag(ContactsConstants.CONTACT_LIST); // This flag notes that the Activity is doing a search, and so the result will be // search results rather than all contacts. This prevents the Activity and Fragment // from trying to a search on search results. isSearchResultView = true; mContactsListFragment.setSearchQuery(searchQuery); // Set special title for search results String title = getString(R.string.contacts_list_search_results_title, searchQuery); setTitle(title); } else { ContactsListFragment mContactsListFragment = new ContactsListFragment(); getSupportFragmentManager().beginTransaction() .replace(R.id.fragment_container, mContactsListFragment, ContactsConstants.CONTACT_LIST) .commit(); } break; case 1: CallHistoryFragment mCallHistoryFragment = new CallHistoryFragment(); getSupportFragmentManager().beginTransaction() .replace(R.id.fragment_container, mCallHistoryFragment, ContactsConstants.CALL_HISTORY) .commit(); break; } } @Override public void onTabUnselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { // TODO Auto-generated method stub } }