<commit_before>/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 android.support.v4.app;

import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources.NotFoundException;
import android.content.res.TypedArray;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.CallSuper;
import android.support.annotation.IdRes;
import android.support.annotation.StringRes;
import android.support.v4.util.DebugUtils;
import android.support.v4.util.LogWriter;
import android.support.v4.view.LayoutInflaterFactory;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseArray;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.Animation.AnimationListener;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Static library support version of the framework's {@link android.app.FragmentManager}.
 * Used to write apps that run on platforms prior to Android 3.0.  When running
 * on Android 3.0 or above, this implementation is still used; it does not try
 * to switch to the framework's implementation.  See the framework {@link FragmentManager}
 * documentation for a class overview.
 *
 * <p>Your activity must derive from {@link FragmentActivity} to use this. From such an activity,
 * you can acquire the {@link FragmentManager} by calling
 * {@link FragmentActivity#getSupportFragmentManager}.
 */
public abstract class FragmentManager {
    /**
     * Representation of an entry on the fragment back stack, as created
     * with {@link FragmentTransaction#addToBackStack(String)
     * FragmentTransaction.addToBackStack()}.  Entries can later be
     * retrieved with {@link FragmentManager#getBackStackEntryAt(int)
     * FragmentManager.getBackStackEntry()}.
     *
     * <p>Note that you should never hold on to a BackStackEntry object;
     * the identifier as returned by {@link #getId} is the only thing that
     * will be persisted across activity instances.
     */
    public interface BackStackEntry {
        /**
         * Return the unique identifier for the entry.  This is the only
         * representation of the entry that will persist across activity
         * instances.
         */
        public int getId();

        /**
         * Get the name that was supplied to
         * {@link FragmentTransaction#addToBackStack(String)
         * FragmentTransaction.addToBackStack(String)} when creating this entry.
         */
        public String getName();

        /**
         * Return the full bread crumb title resource identifier for the entry,
         * or 0 if it does not have one.
         */
        @StringRes
        public int getBreadCrumbTitleRes();

        /**
         * Return the short bread crumb title resource identifier for the entry,
         * or 0 if it does not have one.
         */
        @StringRes
        public int getBreadCrumbShortTitleRes();

        /**
         * Return the full bread crumb title for the entry, or null if it
         * does not have one.
         */
        public CharSequence getBreadCrumbTitle();

        /**
         * Return the short bread crumb title for the entry, or null if it
         * does not have one.
         */
        public CharSequence getBreadCrumbShortTitle();
    }

    /**
     * Interface to watch for changes to the back stack.
     */
    public interface OnBackStackChangedListener {
        /**
         * Called whenever the contents of the back stack change.
         */
        public void onBackStackChanged();
    }

    /**
     * Start a series of edit operations on the Fragments associated with
     * this FragmentManager.
     * 
     * <p>Note: A fragment transaction can only be created/committed prior
     * to an activity saving its state.  If you try to commit a transaction
     * after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()}
     * (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart}
     * or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error.
     * This is because the framework takes care of saving your current fragments
     * in the state, and if changes are made after the state is saved then they
     * will be lost.</p>
     */
    public abstract FragmentTransaction beginTransaction();

    /** @hide -- remove once prebuilts are in. */
    @Deprecated
    public FragmentTransaction openTransaction() {
        return beginTransaction();
    }
    
    /**
     * After a {@link FragmentTransaction} is committed with
     * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it
     * is scheduled to be executed asynchronously on the process's main thread.
     * If you want to immediately executing any such pending operations, you
     * can call this function (only from the main thread) to do so.  Note that
     * all callbacks and other related behavior will be done from within this
     * call, so be careful about where this is called from.
     *
     * @return Returns true if there were any pending transactions to be
     * executed.
     */
    public abstract boolean executePendingTransactions();

    /**
     * Finds a fragment that was identified by the given id either when inflated
     * from XML or as the container ID when added in a transaction.  This first
     * searches through fragments that are currently added to the manager's
     * activity; if no such fragment is found, then all fragments currently
     * on the back stack associated with this ID are searched.
     * @return The fragment if found or null otherwise.
     */
    public abstract Fragment findFragmentById(@IdRes int id);

    /**
     * Finds a fragment that was identified by the given tag either when inflated
     * from XML or as supplied when added in a transaction.  This first<commit_msg>Fragment docs for executePendingTransactions vs. commitNow<commit_after>/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 android.support.v4.app;

import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources.NotFoundException;
import android.content.res.TypedArray;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.CallSuper;
import android.support.annotation.IdRes;
import android.support.annotation.StringRes;
import android.support.v4.util.DebugUtils;
import android.support.v4.util.LogWriter;
import android.support.v4.view.LayoutInflaterFactory;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseArray;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.Animation.AnimationListener;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Static library support version of the framework's {@link android.app.FragmentManager}.
 * Used to write apps that run on platforms prior to Android 3.0.  When running
 * on Android 3.0 or above, this implementation is still used; it does not try
 * to switch to the framework's implementation.  See the framework {@link FragmentManager}
 * documentation for a class overview.
 *
 * <p>Your activity must derive from {@link FragmentActivity} to use this. From such an activity,
 * you can acquire the {@link FragmentManager} by calling
 * {@link FragmentActivity#getSupportFragmentManager}.
 */
public abstract class FragmentManager {
    /**
     * Representation of an entry on the fragment back stack, as created
     * with {@link FragmentTransaction#addToBackStack(String)
     * FragmentTransaction.addToBackStack()}.  Entries can later be
     * retrieved with {@link FragmentManager#getBackStackEntryAt(int)
     * FragmentManager.getBackStackEntry()}.
     *
     * <p>Note that you should never hold on to a BackStackEntry object;
     * the identifier as returned by {@link #getId} is the only thing that
     * will be persisted across activity instances.
     */
    public interface BackStackEntry {
        /**
         * Return the unique identifier for the entry.  This is the only
         * representation of the entry that will persist across activity
         * instances.
         */
        public int getId();

        /**
         * Get the name that was supplied to
         * {@link FragmentTransaction#addToBackStack(String)
         * FragmentTransaction.addToBackStack(String)} when creating this entry.
         */
        public String getName();

        /**
         * Return the full bread crumb title resource identifier for the entry,
         * or 0 if it does not have one.
         */
        @StringRes
        public int getBreadCrumbTitleRes();

        /**
         * Return the short bread crumb title resource identifier for the entry,
         * or 0 if it does not have one.
         */
        @StringRes
        public int getBreadCrumbShortTitleRes();

        /**
         * Return the full bread crumb title for the entry, or null if it
         * does not have one.
         */
        public CharSequence getBreadCrumbTitle();

        /**
         * Return the short bread crumb title for the entry, or null if it
         * does not have one.
         */
        public CharSequence getBreadCrumbShortTitle();
    }

    /**
     * Interface to watch for changes to the back stack.
     */
    public interface OnBackStackChangedListener {
        /**
         * Called whenever the contents of the back stack change.
         */
        public void onBackStackChanged();
    }

    /**
     * Start a series of edit operations on the Fragments associated with
     * this FragmentManager.
     * 
     * <p>Note: A fragment transaction can only be created/committed prior
     * to an activity saving its state.  If you try to commit a transaction
     * after {@link FragmentActivity#onSaveInstanceState FragmentActivity.onSaveInstanceState()}
     * (and prior to a following {@link FragmentActivity#onStart FragmentActivity.onStart}
     * or {@link FragmentActivity#onResume FragmentActivity.onResume()}, you will get an error.
     * This is because the framework takes care of saving your current fragments
     * in the state, and if changes are made after the state is saved then they
     * will be lost.</p>
     */
    public abstract FragmentTransaction beginTransaction();

    /** @hide -- remove once prebuilts are in. */
    @Deprecated
    public FragmentTransaction openTransaction() {
        return beginTransaction();
    }
    
    /**
     * After a {@link FragmentTransaction} is committed with
     * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it
     * is scheduled to be executed asynchronously on the process's main thread.
     * If you want to immediately executing any such pending operations, you
     * can call this function (only from the main thread) to do so.  Note that
     * all callbacks and other related behavior will be done from within this
     * call, so be careful about where this is called from.
     *
     * <p>If you are committing a single transaction that does not modify the
     * fragment back stack, strongly consider using
     * {@link FragmentTransaction#commitNow()} instead. This can help avoid
     * unwanted side effects when other code in your app has pending committed
     * transactions that expect different timing.</p>
     *
     * @return Returns true if there were any pending transactions to be
     * executed.
     */
    public abstract boolean executePendingTransactions();

    /**
     * Finds a fragment that was identified by the given id either when inflated
     * from XML or as the container ID when added in a transaction.  This first
     * searches through fragments that are currently added to the manager's
     * activity; if no such fragment is found, then all fragments currently
     * on the back stack associated with this ID are searched.
     * @return The fragment if found or null otherwise.
     */
    public abstract Fragment findFragmentById(@IdRes int id);

    /**
     * Finds a fragment that was identified by the given tag either when inflated
     * from XML or as supplied when added in a transaction.  This first
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