Java tutorial
package android.app; import android.annotation.AnimatorRes; import android.annotation.IdRes; import android.annotation.IntDef; import android.annotation.Nullable; import android.annotation.StringRes; import android.annotation.StyleRes; import android.os.Bundle; import android.view.View; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; /** * API for performing a set of Fragment operations. * * <div class="special reference"> * <h3>Developer Guides</h3> * <p>For more information about using fragments, read the * <a href="{@docRoot}guide/components/fragments.html">Fragments</a> developer * guide.</p> * </div> * * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html">Support Library</a> * {@link android.support.v4.app.FragmentTransaction} */ @Deprecated public abstract class FragmentTransaction { /** * Calls {@link #add(int, Fragment, String)} with a 0 containerViewId. */ public abstract FragmentTransaction add(Fragment fragment, String tag); /** * Calls {@link #add(int, Fragment, String)} with a null tag. */ public abstract FragmentTransaction add(@IdRes int containerViewId, Fragment fragment); /** * Add a fragment to the activity state. This fragment may optionally * also have its view (if {@link Fragment#onCreateView Fragment.onCreateView} * returns non-null) inserted into a container view of the activity. * * @param containerViewId Optional identifier of the container this fragment is * to be placed in. If 0, it will not be placed in a container. * @param fragment The fragment to be added. This fragment must not already * be added to the activity. * @param tag Optional tag name for the fragment, to later retrieve the * fragment with {@link FragmentManager#findFragmentByTag(String) * FragmentManager.findFragmentByTag(String)}. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction add(@IdRes int containerViewId, Fragment fragment, String tag); /** * Calls {@link #replace(int, Fragment, String)} with a null tag. */ public abstract FragmentTransaction replace(@IdRes int containerViewId, Fragment fragment); /** * Replace an existing fragment that was added to a container. This is * essentially the same as calling {@link #remove(Fragment)} for all * currently added fragments that were added with the same containerViewId * and then {@link #add(int, Fragment, String)} with the same arguments * given here. * * @param containerViewId Identifier of the container whose fragment(s) are * to be replaced. * @param fragment The new fragment to place in the container. * @param tag Optional tag name for the fragment, to later retrieve the * fragment with {@link FragmentManager#findFragmentByTag(String) * FragmentManager.findFragmentByTag(String)}. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction replace(@IdRes int containerViewId, Fragment fragment, String tag); /** * Remove an existing fragment. If it was added to a container, its view * is also removed from that container. * * @param fragment The fragment to be removed. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction remove(Fragment fragment); /** * Hides an existing fragment. This is only relevant for fragments whose * views have been added to a container, as this will cause the view to * be hidden. * * @param fragment The fragment to be hidden. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction hide(Fragment fragment); /** * Shows a previously hidden fragment. This is only relevant for fragments whose * views have been added to a container, as this will cause the view to * be shown. * * @param fragment The fragment to be shown. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction show(Fragment fragment); /** * Detach the given fragment from the UI. This is the same state as * when it is put on the back stack: the fragment is removed from * the UI, however its state is still being actively managed by the * fragment manager. When going into this state its view hierarchy * is destroyed. * * @param fragment The fragment to be detached. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction detach(Fragment fragment); /** * Re-attach a fragment after it had previously been detached from * the UI with {@link #detach(Fragment)}. This * causes its view hierarchy to be re-created, attached to the UI, * and displayed. * * @param fragment The fragment to be attached. * * @return Returns the same FragmentTransaction instance. */ public abstract FragmentTransaction attach(Fragment fragment); /** * Set a currently active fragment in this FragmentManager as the primary navigation fragment. * * <p>The primary navigation fragment's * {@link Fragment#getChildFragmentManager() child FragmentManager} will be called first * to process delegated navigation actions such as {@link FragmentManager#popBackStack()} * if no ID or transaction name is provided to pop to. Navigation operations outside of the * fragment system may choose to delegate those actions to the primary navigation fragment * as returned by {@link FragmentManager#getPrimaryNavigationFragment()}.</p> * * <p>The fragment provided must currently be added to the FragmentManager to be set as * a primary navigation fragment, or previously added as part of this transaction.</p> * * @param fragment the fragment to set as the primary navigation fragment * @return the same FragmentTransaction instance */ public abstract FragmentTransaction setPrimaryNavigationFragment(Fragment fragment); /** * @return <code>true</code> if this transaction contains no operations, * <code>false</code> otherwise. */ public abstract boolean isEmpty(); /** * Bit mask that is set for all enter transitions. */ public static final int TRANSIT_ENTER_MASK = 0x1000; /** * Bit mask that is set for all exit transitions. */ public static final int TRANSIT_EXIT_MASK = 0x2000; /** Not set up for a transition. */ public static final int TRANSIT_UNSET = -1; /** No animation for transition. */ public static final int TRANSIT_NONE = 0; /** Fragment is being added onto the stack */ public static final int TRANSIT_FRAGMENT_OPEN = 1 | TRANSIT_ENTER_MASK; /** Fragment is being removed from the stack */ public static final int TRANSIT_FRAGMENT_CLOSE = 2 | TRANSIT_EXIT_MASK; /** Fragment should simply fade in or out; that is, no strong navigation associated * with it except that it is appearing or disappearing for some reason. */ public static final int TRANSIT_FRAGMENT_FADE = 3 | TRANSIT_ENTER_MASK; /** @hide */ @IntDef(prefix = { "TRANSIT_" }, value = { TRANSIT_NONE, TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, TRANSIT_FRAGMENT_FADE }) @Retention(RetentionPolicy.SOURCE) public @interface Transit { } /** * Set specific animation resources to run for the fragments that are * entering and exiting in this transaction. These animations will not be * played when popping the back stack. */ public abstract FragmentTransaction setCustomAnimations(@AnimatorRes int enter, @AnimatorRes int exit); /** * Set specific animation resources to run for the fragments that are * entering and exiting in this transaction. The <code>popEnter</code> * and <code>popExit</code> animations will be played for enter/exit * operations specifically when popping the back stack. */ public abstract FragmentTransaction setCustomAnimations(@AnimatorRes int enter, @AnimatorRes int exit, @AnimatorRes int popEnter, @AnimatorRes int popExit); /** * Select a standard transition animation for this transaction. May be * one of {@link #TRANSIT_NONE}, {@link #TRANSIT_FRAGMENT_OPEN}, * {@link #TRANSIT_FRAGMENT_CLOSE}, or {@link #TRANSIT_FRAGMENT_FADE}. */ public abstract FragmentTransaction setTransition(@Transit int transit); /** * Used with to map a View from a removed or hidden Fragment to a View from a shown * or added Fragment. * @param sharedElement A View in a disappearing Fragment to match with a View in an * appearing Fragment. * @param name The transitionName for a View in an appearing Fragment to match to the shared * element. */ public abstract FragmentTransaction addSharedElement(View sharedElement, String name); /** * Set a custom style resource that will be used for resolving transit * animations. */ public abstract FragmentTransaction setTransitionStyle(@StyleRes int styleRes); /** * Add this transaction to the back stack. This means that the transaction * will be remembered after it is committed, and will reverse its operation * when later popped off the stack. * * @param name An optional name for this back stack state, or null. */ public abstract FragmentTransaction addToBackStack(@Nullable String name); /** * Returns true if this FragmentTransaction is allowed to be added to the back * stack. If this method would return false, {@link #addToBackStack(String)} * will throw {@link IllegalStateException}. * * @return True if {@link #addToBackStack(String)} is permitted on this transaction. */ public abstract boolean isAddToBackStackAllowed(); /** * Disallow calls to {@link #addToBackStack(String)}. Any future calls to * addToBackStack will throw {@link IllegalStateException}. If addToBackStack * has already been called, this method will throw IllegalStateException. */ public abstract FragmentTransaction disallowAddToBackStack(); /** * Set the full title to show as a bread crumb when this transaction * is on the back stack, as used by {@link FragmentBreadCrumbs}. * * @param res A string resource containing the title. */ public abstract FragmentTransaction setBreadCrumbTitle(@StringRes int res); /** * Like {@link #setBreadCrumbTitle(int)} but taking a raw string; this * method is <em>not</em> recommended, as the string can not be changed * later if the locale changes. */ public abstract FragmentTransaction setBreadCrumbTitle(CharSequence text); /** * Set the short title to show as a bread crumb when this transaction * is on the back stack, as used by {@link FragmentBreadCrumbs}. * * @param res A string resource containing the title. */ public abstract FragmentTransaction setBreadCrumbShortTitle(@StringRes int res); /** * Like {@link #setBreadCrumbShortTitle(int)} but taking a raw string; this * method is <em>not</em> recommended, as the string can not be changed * later if the locale changes. */ public abstract FragmentTransaction setBreadCrumbShortTitle(CharSequence text); /** * Sets whether or not to allow optimizing operations within and across * transactions. This will remove redundant operations, eliminating * operations that cancel. For example, if two transactions are executed * together, one that adds a fragment A and the next replaces it with fragment B, * the operations will cancel and only fragment B will be added. That means that * fragment A may not go through the creation/destruction lifecycle. * <p> * The side effect of removing redundant operations is that fragments may have state changes * out of the expected order. For example, one transaction adds fragment A, * a second adds fragment B, then a third removes fragment A. Without removing the redundant * operations, fragment B could expect that while it is being created, fragment A will also * exist because fragment A will be removed after fragment B was added. * With removing redundant operations, fragment B cannot expect fragment A to exist when * it has been created because fragment A's add/remove will be optimized out. * <p> * It can also reorder the state changes of Fragments to allow for better Transitions. * Added Fragments may have {@link Fragment#onCreate(Bundle)} called before replaced * Fragments have {@link Fragment#onDestroy()} called. * <p> * The default is {@code false} for applications targeting version * versions prior to O and {@code true} for applications targeting O and * later. * * @param reorderingAllowed {@code true} to enable optimizing out redundant operations * or {@code false} to disable optimizing out redundant * operations on this transaction. */ public abstract FragmentTransaction setReorderingAllowed(boolean reorderingAllowed); /** * Add a Runnable to this transaction that will be run after this transaction has * been committed. If fragment transactions are {@link #setReorderingAllowed(boolean) optimized} * this may be after other subsequent fragment operations have also taken place, or operations * in this transaction may have been optimized out due to the presence of a subsequent * fragment transaction in the batch. * * * <p>If a transaction is committed using {@link #commitAllowingStateLoss()} this runnable * may be executed when the FragmentManager is in a state where new transactions may not * be committed without allowing state loss.</p> * * <p><code>runOnCommit</code> may not be used with transactions * {@link #addToBackStack(String) added to the back stack} as Runnables cannot be persisted * with back stack state. {@link IllegalStateException} will be thrown if * {@link #addToBackStack(String)} has been previously called for this transaction * or if it is called after a call to <code>runOnCommit</code>.</p> * * @param runnable Runnable to add * @return this FragmentTransaction * @throws IllegalStateException if {@link #addToBackStack(String)} has been called */ public abstract FragmentTransaction runOnCommit(Runnable runnable); /** * Schedules a commit of this transaction. The commit does * not happen immediately; it will be scheduled as work on the main thread * to be done the next time that thread is ready. * * <p class="note">A transaction can only be committed with this method * prior to its containing activity saving its state. If the commit is * attempted after that point, an exception will be thrown. This is * because the state after the commit can be lost if the activity needs to * be restored from its state. See {@link #commitAllowingStateLoss()} for * situations where it may be okay to lose the commit.</p> * * @return Returns the identifier of this transaction's back stack entry, * if {@link #addToBackStack(String)} had been called. Otherwise, returns * a negative number. */ public abstract int commit(); /** * Like {@link #commit} but allows the commit to be executed after an * activity's state is saved. This is dangerous because the commit can * be lost if the activity needs to later be restored from its state, so * this should only be used for cases where it is okay for the UI state * to change unexpectedly on the user. */ public abstract int commitAllowingStateLoss(); /** * Commits this transaction synchronously. Any added fragments will be * initialized and brought completely to the lifecycle state of their host * and any removed fragments will be torn down accordingly before this * call returns. Committing a transaction in this way allows fragments * to be added as dedicated, encapsulated components that monitor the * lifecycle state of their host while providing firmer ordering guarantees * around when those fragments are fully initialized and ready. Fragments * that manage views will have those views created and attached. * * <p>Calling <code>commitNow</code> is preferable to calling * {@link #commit()} followed by {@link FragmentManager#executePendingTransactions()} * as the latter will have the side effect of attempting to commit <em>all</em> * currently pending transactions whether that is the desired behavior * or not.</p> * * <p>Transactions committed in this way may not be added to the * FragmentManager's back stack, as doing so would break other expected * ordering guarantees for other asynchronously committed transactions. * This method will throw {@link IllegalStateException} if the transaction * previously requested to be added to the back stack with * {@link #addToBackStack(String)}.</p> * * <p class="note">A transaction can only be committed with this method * prior to its containing activity saving its state. If the commit is * attempted after that point, an exception will be thrown. This is * because the state after the commit can be lost if the activity needs to * be restored from its state. See {@link #commitAllowingStateLoss()} for * situations where it may be okay to lose the commit.</p> */ public abstract void commitNow(); /** * Like {@link #commitNow} but allows the commit to be executed after an * activity's state is saved. This is dangerous because the commit can * be lost if the activity needs to later be restored from its state, so * this should only be used for cases where it is okay for the UI state * to change unexpectedly on the user. */ public abstract void commitNowAllowingStateLoss(); }