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.google.android.apps.mytracks; // import com.google.android.apps.mytracks.fragments.MapFragment; import com.google.android.apps.mytracks.fragments.StatsFragment; import com.google.android.apps.mytracks.services.TrackRecordingServiceConnection; import com.nogago.android.tracks.Constants; import com.nogago.android.tracks.R; import com.nogago.android.tracks.TrackDetailActivity; import android.app.AlertDialog; import android.content.ComponentName; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.widget.TabHost; import android.widget.TabHost.TabContentFactory; import android.widget.TabHost.TabSpec; import java.util.HashMap; /** * This is a helper class that implements a generic mechanism for associating * fragments with the tabs in a tab host. It relies on a trick. Normally a tab * host has a simple API for supplying a View or Intent that each tab will show. * This is not sufficient for switching between fragments. So instead we make * the content part of the tab host 0dp high (it is not shown) and the * TabManager supplies its own dummy view to show as the tab content. It listens * to changes in tabs, and takes care of switch to the correct fragment shown in * a separate content area whenever the selected tab changes. * <p> * Copied from the Fragment Tabs example in the API 4+ Support Demos. * * @author Jimmy Shih */ public class TabManager implements TabHost.OnTabChangeListener { private final FragmentActivity fragmentActivity; private final TabHost tabHost; private final int containerId; private final HashMap<String, TabInfo> tabs = new HashMap<String, TabInfo>(); private TrackRecordingServiceConnection trackRecordingServiceConnection; private TabInfo lastTabInfo; public boolean clicked = false; public boolean recording = false; /** * An object to hold a tab's info. * * @author Jimmy Shih */ private static final class TabInfo { private final String tag; private final Class<?> clss; private final Bundle bundle; private Fragment fragment; public TabInfo(String tag, Class<?> clss, Bundle bundle) { this.tag = tag; this.clss = clss; this.bundle = bundle; } } /** * A dummy {@link TabContentFactory} that creates an empty view to satisfy the * {@link TabHost} API. * * @author Jimmy Shih */ private static class DummyTabContentFactory implements TabContentFactory { private final Context context; public DummyTabContentFactory(Context context) { this.context = context; } @Override public View createTabContent(String tag) { View view = new View(context); view.setMinimumWidth(0); view.setMinimumHeight(0); return view; } } public TabManager(FragmentActivity fragmentActivity, TabHost tabHost, int containerId) { this.fragmentActivity = fragmentActivity; this.tabHost = tabHost; this.containerId = containerId; tabHost.setOnTabChangedListener(this); } public boolean isRecording() { if (TrackDetailActivity.RECORDING == true) { return true; } return false; } public void addTab(TabSpec tabSpec, Class<?> clss, Bundle bundle) { tabSpec.setContent(new DummyTabContentFactory(fragmentActivity)); String tag = tabSpec.getTag(); TabInfo tabInfo = new TabInfo(tag, clss, bundle); /* * Check to see if we already have a fragment for this tab, probably from a * previously saved state. If so, deactivate it, because our initial state * is that a tab isn't shown. */ tabInfo.fragment = fragmentActivity.getSupportFragmentManager().findFragmentByTag(tag); if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) { FragmentTransaction fragmentTransaction = fragmentActivity.getSupportFragmentManager() .beginTransaction(); fragmentTransaction.detach(tabInfo.fragment); fragmentTransaction.commit(); } tabs.put(tag, tabInfo); tabHost.addTab(tabSpec); } @Override public void onTabChanged(String tabId) { // Alert if nogago Maps isnt installed AlertDialog.Builder notInstalled = new AlertDialog.Builder(fragmentActivity); notInstalled.setMessage(R.string.maps_not_installed).setCancelable(false) .setPositiveButton(R.string.button_yes, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { Uri uri = Uri.parse(Constants.MAPS_DOWNLOAD_URL); Intent showUri = new Intent(Intent.ACTION_VIEW, uri); fragmentActivity.startActivity(showUri); } }).setNegativeButton(R.string.button_no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); final AlertDialog alertnotInstalled = notInstalled.create(); // Alert if nogago Maps is installed AlertDialog.Builder builder = new AlertDialog.Builder(fragmentActivity); builder.setMessage(R.string.wanna_start_maps).setCancelable(false) .setPositiveButton(R.string.button_yes, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { try { if (isRecording()) { String nogagoPackage = "com.nogago.android.maps"; String mapActivity = ".activities.MapActivity"; Intent intent = new Intent(); intent.setComponent(new ComponentName(nogagoPackage, nogagoPackage + mapActivity)); fragmentActivity.startActivity(intent); } else { String trackPackage = "com.nogago.android.tracks"; String trackDetailActivity = ".TrackDetailActivity"; Intent tda = new Intent(); tda.setComponent( new ComponentName(trackPackage, trackPackage + trackDetailActivity)); tda.putExtra("clicked", true); fragmentActivity.startActivity(tda); } } catch (NullPointerException e) { alertnotInstalled.show(); } } }).setNegativeButton(R.string.button_no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alert = builder.create(); if (tabId.compareTo("mapFragment") == 0) { try { tabId = StatsFragment.STATS_FRAGMENT_TAG; // nogagoMaps aufrufen this.tabHost.setCurrentTab(1); try { if (isRecording()) { String nogagoPackage = "com.nogago.android.maps"; String mapActivity = ".activities.MapActivity"; Intent intent = new Intent(); intent.setComponent(new ComponentName(nogagoPackage, nogagoPackage + mapActivity)); fragmentActivity.startActivity(intent); } else { String trackPackage = "com.nogago.android.tracks"; String trackDetailActivity = ".TrackDetailActivity"; Intent tda = new Intent(); tda.setComponent(new ComponentName(trackPackage, trackPackage + trackDetailActivity)); tda.putExtra("clicked", true); fragmentActivity.startActivity(tda); } } catch (NullPointerException e) { alertnotInstalled.show(); } // alert.show(); // falls nicht installiert, fragen, ob installiert werden soll } catch (NullPointerException e) { alertnotInstalled.show(); } } TabInfo newTabInfo = tabs.get(tabId); if (lastTabInfo != newTabInfo) { FragmentTransaction fragmentTransaction = fragmentActivity.getSupportFragmentManager() .beginTransaction(); if (lastTabInfo != null) { if (lastTabInfo.fragment != null) { fragmentTransaction.detach(lastTabInfo.fragment); } } if (newTabInfo != null) { if (newTabInfo.fragment == null) { newTabInfo.fragment = Fragment.instantiate(fragmentActivity, newTabInfo.clss.getName(), newTabInfo.bundle); fragmentTransaction.add(containerId, newTabInfo.fragment, newTabInfo.tag); } else { fragmentTransaction.attach(newTabInfo.fragment); } } lastTabInfo = newTabInfo; fragmentTransaction.commit(); fragmentActivity.getSupportFragmentManager().executePendingTransactions(); } } public int isClicked() { if (clicked == true) { return 1; } else { return 0; } } }