FragmentTransaction.java revision bc377841db05bd5197ffadb58ba52c54b2a85f16
1package android.app; 2 3/** 4 * API for performing a set of Fragment operations. 5 */ 6public abstract class FragmentTransaction { 7 /** 8 * Calls {@link #add(int, Fragment, String)} with a 0 containerViewId. 9 */ 10 public abstract FragmentTransaction add(Fragment fragment, String tag); 11 12 /** 13 * Calls {@link #add(int, Fragment, String)} with a null tag. 14 */ 15 public abstract FragmentTransaction add(int containerViewId, Fragment fragment); 16 17 /** 18 * Add a fragment to the activity state. This fragment may optionally 19 * also have its view (if {@link Fragment#onCreateView Fragment.onCreateView} 20 * returns non-null) into a container view of the activity. 21 * 22 * @param containerViewId Optional identifier of the container this fragment is 23 * to be placed in. If 0, it will not be placed in a container. 24 * @param fragment The fragment to be added. This fragment must not already 25 * be added to the activity. 26 * @param tag Optional tag name for the fragment, to later retrieve the 27 * fragment with {@link FragmentManager#findFragmentByTag(String) 28 * FragmentManager.findFragmentByTag(String)}. 29 * 30 * @return Returns the same FragmentTransaction instance. 31 */ 32 public abstract FragmentTransaction add(int containerViewId, Fragment fragment, String tag); 33 34 /** 35 * Calls {@link #replace(int, Fragment, String)} with a null tag. 36 */ 37 public abstract FragmentTransaction replace(int containerViewId, Fragment fragment); 38 39 /** 40 * Replace an existing fragment that was added to a container. This is 41 * essentially the same as calling {@link #remove(Fragment)} for all 42 * currently added fragments that were added with the same containerViewId 43 * and then {@link #add(int, Fragment, String)} with the same arguments 44 * given here. 45 * 46 * @param containerViewId Identifier of the container whose fragment(s) are 47 * to be replaced. 48 * @param fragment The new fragment to place in the container. 49 * @param tag Optional tag name for the fragment, to later retrieve the 50 * fragment with {@link FragmentManager#findFragmentByTag(String) 51 * FragmentManager.findFragmentByTag(String)}. 52 * 53 * @return Returns the same FragmentTransaction instance. 54 */ 55 public abstract FragmentTransaction replace(int containerViewId, Fragment fragment, String tag); 56 57 /** 58 * Remove an existing fragment. If it was added to a container, its view 59 * is also removed from that container. 60 * 61 * @param fragment The fragment to be removed. 62 * 63 * @return Returns the same FragmentTransaction instance. 64 */ 65 public abstract FragmentTransaction remove(Fragment fragment); 66 67 /** 68 * Hides an existing fragment. This is only relevant for fragments whose 69 * views have been added to a container, as this will cause the view to 70 * be hidden. 71 * 72 * @param fragment The fragment to be hidden. 73 * 74 * @return Returns the same FragmentTransaction instance. 75 */ 76 public abstract FragmentTransaction hide(Fragment fragment); 77 78 /** 79 * Shows a previously hidden fragment. This is only relevant for fragments whose 80 * views have been added to a container, as this will cause the view to 81 * be shown. 82 * 83 * @param fragment The fragment to be shown. 84 * 85 * @return Returns the same FragmentTransaction instance. 86 */ 87 public abstract FragmentTransaction show(Fragment fragment); 88 89 /** 90 * @return <code>true</code> if this transaction contains no operations, 91 * <code>false</code> otherwise. 92 */ 93 public abstract boolean isEmpty(); 94 95 /** 96 * Bit mask that is set for all enter transitions. 97 */ 98 public static final int TRANSIT_ENTER_MASK = 0x1000; 99 100 /** 101 * Bit mask that is set for all exit transitions. 102 */ 103 public static final int TRANSIT_EXIT_MASK = 0x2000; 104 105 /** Not set up for a transition. */ 106 public static final int TRANSIT_UNSET = -1; 107 /** No animation for transition. */ 108 public static final int TRANSIT_NONE = 0; 109 /** Fragment is being added onto the stack */ 110 public static final int TRANSIT_FRAGMENT_OPEN = 1 | TRANSIT_ENTER_MASK; 111 /** Fragment is being removed from the stack */ 112 public static final int TRANSIT_FRAGMENT_CLOSE = 2 | TRANSIT_EXIT_MASK; 113 /** Fragment should simply fade in or out; that is, no strong navigation associated 114 * with it except that it is appearing or disappearing for some reason. */ 115 public static final int TRANSIT_FRAGMENT_FADE = 3 | TRANSIT_ENTER_MASK; 116 117 /** 118 * Set specific animation resources to run for the fragments that are 119 * entering and exiting in this transaction. These animations will not be 120 * played when popping the back stack. 121 */ 122 public abstract FragmentTransaction setCustomAnimations(int enter, int exit); 123 124 /** 125 * Set specific animation resources to run for the fragments that are 126 * entering and exiting in this transaction. The <code>popEnter</code> 127 * and <code>popExit</code> animations will be played for enter/exit 128 * operations specifically when popping the back stack. 129 */ 130 public abstract FragmentTransaction setCustomAnimations(int enter, int exit, 131 int popEnter, int popExit); 132 133 /** 134 * Select a standard transition animation for this transaction. May be 135 * one of {@link #TRANSIT_NONE}, {@link #TRANSIT_FRAGMENT_OPEN}, 136 * or {@link #TRANSIT_FRAGMENT_CLOSE} 137 */ 138 public abstract FragmentTransaction setTransition(int transit); 139 140 /** 141 * Set a custom style resource that will be used for resolving transit 142 * animations. 143 */ 144 public abstract FragmentTransaction setTransitionStyle(int styleRes); 145 146 /** 147 * Add this transaction to the back stack. This means that the transaction 148 * will be remembered after it is committed, and will reverse its operation 149 * when later popped off the stack. 150 * 151 * @param name An optional name for this back stack state, or null. 152 */ 153 public abstract FragmentTransaction addToBackStack(String name); 154 155 /** 156 * Returns true if this FragmentTransaction is allowed to be added to the back 157 * stack. If this method would return false, {@link #addToBackStack(String)} 158 * will throw {@link IllegalStateException}. 159 * 160 * @return True if {@link #addToBackStack(String)} is permitted on this transaction. 161 */ 162 public abstract boolean isAddToBackStackAllowed(); 163 164 /** 165 * Disallow calls to {@link #addToBackStack(String)}. Any future calls to 166 * addToBackStack will throw {@link IllegalStateException}. If addToBackStack 167 * has already been called, this method will throw IllegalStateException. 168 */ 169 public abstract FragmentTransaction disallowAddToBackStack(); 170 171 /** 172 * Set the full title to show as a bread crumb when this transaction 173 * is on the back stack, as used by {@link FragmentBreadCrumbs}. 174 * 175 * @param res A string resource containing the title. 176 */ 177 public abstract FragmentTransaction setBreadCrumbTitle(int res); 178 179 /** 180 * Like {@link #setBreadCrumbTitle(int)} but taking a raw string; this 181 * method is <em>not</em> recommended, as the string can not be changed 182 * later if the locale changes. 183 */ 184 public abstract FragmentTransaction setBreadCrumbTitle(CharSequence text); 185 186 /** 187 * Set the short title to show as a bread crumb when this transaction 188 * is on the back stack, as used by {@link FragmentBreadCrumbs}. 189 * 190 * @param res A string resource containing the title. 191 */ 192 public abstract FragmentTransaction setBreadCrumbShortTitle(int res); 193 194 /** 195 * Like {@link #setBreadCrumbShortTitle(int)} but taking a raw string; this 196 * method is <em>not</em> recommended, as the string can not be changed 197 * later if the locale changes. 198 */ 199 public abstract FragmentTransaction setBreadCrumbShortTitle(CharSequence text); 200 201 /** 202 * Schedules a commit of this transaction. The commit does 203 * not happen immediately; it will be scheduled as work on the main thread 204 * to be done the next time that thread is ready. 205 * 206 * <p class="note">A transaction can only be committed with this method 207 * prior to its containing activity saving its state. If the commit is 208 * attempted after that point, an exception will be thrown. This is 209 * because the state after the commit can be lost if the activity needs to 210 * be restored from its state. See {@link #commitAllowingStateLoss()} for 211 * situations where it may be okay to lose the commit.</p> 212 * 213 * @return Returns the identifier of this transaction's back stack entry, 214 * if {@link #addToBackStack(String)} had been called. Otherwise, returns 215 * a negative number. 216 */ 217 public abstract int commit(); 218 219 /** 220 * Like {@link #commit} but allows the commit to be executed after an 221 * activity's state is saved. This is dangerous because the commit can 222 * be lost if the activity needs to later be restored from its state, so 223 * this should only be used for cases where it is okay for the UI state 224 * to change unexpectedly on the user. 225 */ 226 public abstract int commitAllowingStateLoss(); 227} 228