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.supportv7.app; 17 18 import android.os.Bundle; 19 import android.support.v4.app.Fragment; 20 import android.support.v4.app.FragmentTransaction; 21 import android.support.v7.app.ActionBar; 22 import android.support.v7.app.ActionBar.Tab; 23 import android.support.v7.app.ActionBarActivity; 24 import android.view.LayoutInflater; 25 import android.view.View; 26 import android.view.ViewGroup; 27 import android.widget.TextView; 28 import android.widget.Toast; 29 import com.example.android.supportv7.R; 30 31 /** 32 * This demonstrates the use of action bar tabs and how they interact 33 * with other action bar features. 34 */ 35 public class ActionBarTabs extends ActionBarActivity { 36 @Override 37 protected void onCreate(Bundle savedInstanceState) { 38 super.onCreate(savedInstanceState); 39 40 setContentView(R.layout.action_bar_tabs); 41 } 42 43 public void onAddTab(View v) { 44 final ActionBar bar = getSupportActionBar(); 45 final int tabCount = bar.getTabCount(); 46 final String text = "Tab " + tabCount; 47 bar.addTab(bar.newTab() 48 .setText(text) 49 .setTabListener(new TabListener(new TabContentFragment(text)))); 50 } 51 52 public void onRemoveTab(View v) { 53 final ActionBar bar = getSupportActionBar(); 54 if (bar.getTabCount() > 0) { 55 bar.removeTabAt(bar.getTabCount() - 1); 56 } 57 } 58 59 public void onToggleTabs(View v) { 60 final ActionBar bar = getSupportActionBar(); 61 62 if (bar.getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) { 63 bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 64 bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE, ActionBar.DISPLAY_SHOW_TITLE); 65 } else { 66 bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 67 bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); 68 } 69 } 70 71 public void onRemoveAllTabs(View v) { 72 getSupportActionBar().removeAllTabs(); 73 } 74 75 /** 76 * A TabListener receives event callbacks from the action bar as tabs 77 * are deselected, selected, and reselected. A FragmentTransaction 78 * is provided to each of these callbacks; if any operations are added 79 * to it, it will be committed at the end of the full tab switch operation. 80 * This lets tab switches be atomic without the app needing to track 81 * the interactions between different tabs. 82 * 83 * NOTE: This is a very simple implementation that does not retain 84 * fragment state of the non-visible tabs across activity instances. 85 * Look at the FragmentTabs example for how to do a more complete 86 * implementation. 87 */ 88 private class TabListener implements ActionBar.TabListener { 89 private TabContentFragment mFragment; 90 91 public TabListener(TabContentFragment fragment) { 92 mFragment = fragment; 93 } 94 95 @Override 96 public void onTabSelected(Tab tab, FragmentTransaction ft) { 97 ft.add(R.id.fragment_content, mFragment, mFragment.getText()); 98 } 99 100 @Override 101 public void onTabUnselected(Tab tab, FragmentTransaction ft) { 102 ft.remove(mFragment); 103 } 104 105 @Override 106 public void onTabReselected(Tab tab, FragmentTransaction ft) { 107 Toast.makeText(ActionBarTabs.this, "Reselected!", Toast.LENGTH_SHORT).show(); 108 } 109 110 } 111 112 private class TabContentFragment extends Fragment { 113 private String mText; 114 115 public TabContentFragment(String text) { 116 mText = text; 117 } 118 119 public String getText() { 120 return mText; 121 } 122 123 @Override 124 public View onCreateView(LayoutInflater inflater, ViewGroup container, 125 Bundle savedInstanceState) { 126 View fragView = inflater.inflate(R.layout.action_bar_tab_content, container, false); 127 128 TextView text = (TextView) fragView.findViewById(R.id.text); 129 text.setText(mText); 130 131 return fragView; 132 } 133 } 134 } 135