Java tutorial
/* * Copyright 2011 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.google.android.apps.iosched2.ui.tablet; import gdd11.app.R; import com.google.android.apps.iosched2.ui.BaseMultiPaneActivity; import com.google.android.apps.iosched2.ui.MapFragment; import com.google.android.apps.iosched2.ui.SessionDetailFragment; import com.google.android.apps.iosched2.ui.SessionsFragment; import com.google.android.apps.iosched2.ui.VendorDetailFragment; import com.google.android.apps.iosched2.ui.VendorsFragment; import com.kupriyanov.android.apps.gddsched.Setup; import android.app.FragmentBreadCrumbs; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.View; /** * A multi-pane activity, where the primary navigation pane is a {@link MapFragment}, that shows * {@link SessionsFragment}, {@link SessionDetailFragment}, {@link VendorsFragment}, and * {@link VendorDetailFragment} as popups. * * This activity requires API level 11 or greater because of its use of {@link FragmentBreadCrumbs}. */ public class MapMultiPaneActivity extends BaseMultiPaneActivity implements View.OnClickListener, FragmentManager.OnBackStackChangedListener { private static final int POPUP_TYPE_SESSIONS = 1; private static final int POPUP_TYPE_VENDORS = 2; private int mPopupType = -1; private boolean mPauseBackStackWatcher = false; private FragmentManager mFragmentManager; private FragmentBreadCrumbs mFragmentBreadCrumbs; private MapFragment mMapFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_map); mFragmentManager = getSupportFragmentManager(); mFragmentManager.addOnBackStackChangedListener(this); mFragmentBreadCrumbs = (FragmentBreadCrumbs) findViewById(R.id.breadcrumbs); mFragmentBreadCrumbs.setActivity(this); mMapFragment = (MapFragment) mFragmentManager.findFragmentByTag("map"); if (mMapFragment == null) { mMapFragment = new MapFragment(); mMapFragment.setArguments(intentToFragmentArguments(getIntent())); mFragmentManager.beginTransaction().add(R.id.fragment_container_map, mMapFragment, "map").commit(); } findViewById(R.id.close_button).setOnClickListener(new View.OnClickListener() { public void onClick(View view) { clearBackStack(getSupportFragmentManager()); } }); updateBreadCrumb(); } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); getActivityHelper().setupSubActivity(); } @Override public FragmentReplaceInfo onSubstituteFragmentForActivityLaunch(String activityClassName) { if (Setup.SessionsActivityClass.getName().equals(activityClassName)) { clearBackStack(getSupportFragmentManager()); mPopupType = POPUP_TYPE_SESSIONS; showHideDetailAndPan(true); return new FragmentReplaceInfo(Setup.SessionsFragmentClass, "sessions", R.id.fragment_container_map_detail); } else if (Setup.SessionDetailActivityClass.getName().equals(activityClassName)) { mPopupType = POPUP_TYPE_SESSIONS; showHideDetailAndPan(true); return new FragmentReplaceInfo(Setup.SessionDetailFragmentClass, "session_detail", R.id.fragment_container_map_detail); } else if (Setup.VendorsActivityClass.getName().equals(activityClassName)) { clearBackStack(getSupportFragmentManager()); mPopupType = POPUP_TYPE_VENDORS; showHideDetailAndPan(true); return new FragmentReplaceInfo(Setup.VendorsFragmentClass, "vendors", R.id.fragment_container_map_detail); } else if (Setup.VendorDetailActivityClass.getName().equals(activityClassName)) { mPopupType = POPUP_TYPE_VENDORS; showHideDetailAndPan(true); return new FragmentReplaceInfo(Setup.VendorDetailFragmentClass, "vendor_detail", R.id.fragment_container_map_detail); } return null; } @Override protected void onBeforeCommitReplaceFragment(FragmentManager fm, FragmentTransaction ft, Fragment fragment) { super.onBeforeCommitReplaceFragment(fm, ft, fragment); if (fragment instanceof SessionsFragment || fragment instanceof VendorsFragment) { mPauseBackStackWatcher = true; clearBackStack(fm); mPauseBackStackWatcher = false; } ft.addToBackStack(null); updateBreadCrumb(); } /** * Handler for the breadcrumb parent. */ public void onClick(View view) { mFragmentManager.popBackStack(); } private void clearBackStack(FragmentManager fm) { while (fm.getBackStackEntryCount() > 0) { fm.popBackStackImmediate(); } } public void onBackStackChanged() { if (mPauseBackStackWatcher) { return; } if (mFragmentManager.getBackStackEntryCount() == 0) { showHideDetailAndPan(false); } updateBreadCrumb(); } private void showHideDetailAndPan(boolean show) { View detailPopup = findViewById(R.id.map_detail_popup); if (show != (detailPopup.getVisibility() == View.VISIBLE)) { detailPopup.setVisibility(show ? View.VISIBLE : View.GONE); mMapFragment.panLeft(show ? 0.25f : -0.25f); } } public void updateBreadCrumb() { final String title = (mPopupType == POPUP_TYPE_SESSIONS) ? getString(R.string.title_sessions) : getString(R.string.title_vendors); final String detailTitle = (mPopupType == POPUP_TYPE_SESSIONS) ? getString(R.string.title_session_detail) : getString(R.string.title_vendor_detail); if (mFragmentManager.getBackStackEntryCount() >= 2) { mFragmentBreadCrumbs.setParentTitle(title, title, this); mFragmentBreadCrumbs.setTitle(detailTitle, detailTitle); } else { mFragmentBreadCrumbs.setParentTitle(null, null, null); mFragmentBreadCrumbs.setTitle(title, title); } } }