1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.example.android.apis.app; 17 18 import com.example.android.apis.R; 19 20 import android.app.ActionBar; 21 import android.app.ActionBar.Tab; 22 import android.app.Activity; 23 import android.app.Fragment; 24 import android.app.FragmentTransaction; 25 import android.os.Bundle; 26 import android.view.LayoutInflater; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.widget.TextView; 30 import android.widget.Toast; 31 32 /** 33 * This demonstrates the use of action bar tabs and how they interact 34 * with other action bar features. 35 */ 36 public class ActionBarTabs extends Activity { 37 @Override onCreate(Bundle savedInstanceState)38 protected void onCreate(Bundle savedInstanceState) { 39 super.onCreate(savedInstanceState); 40 41 setContentView(R.layout.action_bar_tabs); 42 } 43 onAddTab(View v)44 public void onAddTab(View v) { 45 final ActionBar bar = getActionBar(); 46 final int tabCount = bar.getTabCount(); 47 final String text = "Tab " + tabCount; 48 bar.addTab(bar.newTab() 49 .setText(text) 50 .setTabListener(new TabListener(new TabContentFragment(text)))); 51 } 52 onRemoveTab(View v)53 public void onRemoveTab(View v) { 54 final ActionBar bar = getActionBar(); 55 bar.removeTabAt(bar.getTabCount() - 1); 56 } 57 onToggleTabs(View v)58 public void onToggleTabs(View v) { 59 final ActionBar bar = getActionBar(); 60 61 if (bar.getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) { 62 bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 63 bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE, ActionBar.DISPLAY_SHOW_TITLE); 64 } else { 65 bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 66 bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); 67 } 68 } 69 onRemoveAllTabs(View v)70 public void onRemoveAllTabs(View v) { 71 getActionBar().removeAllTabs(); 72 } 73 74 /** 75 * A TabListener receives event callbacks from the action bar as tabs 76 * are deselected, selected, and reselected. A FragmentTransaction 77 * is provided to each of these callbacks; if any operations are added 78 * to it, it will be committed at the end of the full tab switch operation. 79 * This lets tab switches be atomic without the app needing to track 80 * the interactions between different tabs. 81 * 82 * NOTE: This is a very simple implementation that does not retain 83 * fragment state of the non-visible tabs across activity instances. 84 * Look at the FragmentTabs example for how to do a more complete 85 * implementation. 86 */ 87 private class TabListener implements ActionBar.TabListener { 88 private TabContentFragment mFragment; 89 TabListener(TabContentFragment fragment)90 public TabListener(TabContentFragment fragment) { 91 mFragment = fragment; 92 } 93 onTabSelected(Tab tab, FragmentTransaction ft)94 public void onTabSelected(Tab tab, FragmentTransaction ft) { 95 ft.add(R.id.fragment_content, mFragment, mFragment.getText()); 96 } 97 onTabUnselected(Tab tab, FragmentTransaction ft)98 public void onTabUnselected(Tab tab, FragmentTransaction ft) { 99 ft.remove(mFragment); 100 } 101 onTabReselected(Tab tab, FragmentTransaction ft)102 public void onTabReselected(Tab tab, FragmentTransaction ft) { 103 Toast.makeText(ActionBarTabs.this, "Reselected!", Toast.LENGTH_SHORT).show(); 104 } 105 106 } 107 108 private class TabContentFragment extends Fragment { 109 private String mText; 110 TabContentFragment(String text)111 public TabContentFragment(String text) { 112 mText = text; 113 } 114 getText()115 public String getText() { 116 return mText; 117 } 118 119 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)120 public View onCreateView(LayoutInflater inflater, ViewGroup container, 121 Bundle savedInstanceState) { 122 View fragView = inflater.inflate(R.layout.action_bar_tab_content, container, false); 123 124 TextView text = (TextView) fragView.findViewById(R.id.text); 125 text.setText(mText); 126 127 return fragView; 128 } 129 130 } 131 } 132