/*
* Copyright (C) 2010 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.app;
import android.animation.Animator;
import android.content.ComponentCallbacks2;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AndroidRuntimeException;
import android.util.AttributeSet;
import android.util.DebugUtils;
import android.util.Log;
import android.util.SparseArray;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnCreateContextMenuListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.HashMap;
final class FragmentState implements Parcelable {
final String mClassName;
final int mIndex;
final boolean mFromLayout;
final int mFragmentId;
final int mContainerId;
final String mTag;
final boolean mRetainInstance;
final boolean mDetached;
final Bundle mArguments;
Bundle mSavedFragmentState;
Fragment mInstance;
public FragmentState(Fragment frag) {
mClassName = frag.getClass().getName();
mIndex = frag.mIndex;
mFromLayout = frag.mFromLayout;
mFragmentId = frag.mFragmentId;
mContainerId = frag.mContainerId;
mTag = frag.mTag;
mRetainInstance = frag.mRetainInstance;
mDetached = frag.mDetached;
mArguments = frag.mArguments;
}
public FragmentState(Parcel in) {
mClassName = in.readString();
mIndex = in.readInt();
mFromLayout = in.readInt() != 0;
mFragmentId = in.readInt();
mContainerId = in.readInt();
mTag = in.readString();
mRetainInstance = in.readInt() != 0;
mDetached = in.readInt() != 0;
mArguments = in.readBundle();
mSavedFragmentState = in.readBundle();
}
public Fragment instantiate(Activity activity, Fragment parent) {
if (mInstance != null) {
return mInstance;
}
if (mArguments != null) {
mArguments.setClassLoader(activity.getClassLoader());
}
mInstance = Fragment.instantiate(activity, mClassName, mArguments);
if (mSavedFragmentState != null) {
mSavedFragmentState.setClassLoader(activity.getClassLoader());
mInstance.mSavedFragmentState = mSavedFragmentState;
}
mInstance.setIndex(mIndex, parent);
mInstance.mFromLayout = mFromLayout;
mInstance.mRestored = true;
mInstance.mFragmentId = mFragmentId;
mInstance.mContainerId = mContainerId;
mInstance.mTag = mTag;
mInstance.mRetainInstance = mRetainInstance;
mInstance.mDetached = mDetached;
mInstance.mFragmentManager = activity.mFragments;
if (FragmentManagerImpl.DEBUG) Log.v(FragmentManagerImpl.TAG,
"Instantiated fragment " + mInstance);
return mInstance;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(mClassName);
dest.writeInt(mIndex);
dest.writeInt(mFromLayout ? 1 : 0);
dest.writeInt(mFragmentId);
dest.writeInt(mContainerId);
dest.writeString(mTag);
dest.writeInt(mRetainInstance ? 1 : 0);
dest.writeInt(mDetached ? 1 : 0);
dest.writeBundle(mArguments);
dest.writeBundle(mSavedFragmentState);
}
public static final Parcelable.Creator<FragmentState> CREATOR
= new Parcelable.Creator<FragmentState>() {
public FragmentState createFromParcel(Parcel in) {
return new FragmentState(in);
}
public FragmentState[] newArray(int size) {
return new FragmentState[size];
}
};
}
/**
* 片段是可以在{@link Activity 活动}中替换的，应用用户界面或行为的一小部分。
* 与片段的交互通过 {@link FragmentManager} 完成，可以通过
* {@link Activity#getFragmentManager() Activity.getFragmentManager()} 和
* {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}取得。
*
* <p>Fragment 类可以以多种方式使用，产生各种不同的结果。其核心是，
* 运行于更大的 {@link Activity } 中，提供特殊的操作和接口。
* 片段与其所在的活动紧密结合，不能单独使用。虽然片段定义了自己的生命周期，
* 该生命周期依赖于其所在的活动：如果活动停止，其中的片段无法运行；
* 当活动被销毁时，所以的片段也会被销毁。
*
* <p>片段的所有子类都必须包含一个公共的空构造函数。
* 框架在需要的时候会重新实例化片段类，通常是在恢复状态期间，
* 系统要找到该构造函数来进行实例化。如果空构造函数不存在，
* 在状态恢复期间的某些情况下可能发生运行时异常。
*
* <p>这里包括的主题：
* <ol>
* <li><a href="#OlderPlatforms">旧平台</a>
* <li><a href="#Lifecycle">生命周期</a>
* <li><a href="#Layout">布局</a>
* <li><a href="#BackStack">返回栈</a>
* </ol>
*
* <div class="special reference">
* <h3>开发者向导</h3>
* <p>关于使用片段的更多信息，请阅读
* <a href="{@docRoot}guide/topics/fundamentals/fragments.html">Fragments
* </a> 开发者向导。</p>
* </div>
*
* <a name="OlderPlatforms"></a>
* <h3>旧平台</h3>
*
* Fragment API 引人自 {@link android.os.Build.VERSION_CODES#HONEYCOMB}，
* 用于旧平台的版本可以通过 {@link android.support.v4.app.FragmentActivity} 使用。
* 更多细节信息参见博客文章
* <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html">
* 全平台可用的 Fragment</a> 。
*
* <a name="Lifecycle"></a>
* <h3>生命周期</h3>
*
* <p>虽然片段的生命周期与拥有它的活动紧密结合，
* 但它也在标准活动生命周期中留下了自己的痕迹。
* 它包括基本的活动生命周期方法，比如 {@link #onResume}，重要的是，
* 这些方法与活动的交互和 UI 生成相关联。
*
* <p>将片段带到 Resumed 状态的一系列核心生命周期方法如下：
*
* <ol>
* <li> {@link #onAttach} 在片段关联到活动时调用一次。
* <li> {@link #onCreate} 在初始创建片段时调用。
* <li> {@link #onCreateView} 创建并返回关联到片段的视图层次。
* <li> {@link #onActivityCreated} 通知片段，包含它的活动已经完成了其
* {@link Activity#onCreate Activity.onCreate()} 的执行。
* <li> {@link #onViewStateRestored} 通知片段，其视图层次保存的状态全部恢复完毕。
* <li> {@link #onStart} 使片段对用户看见（基于包含它的活动被启动）。
* <li> {@link #onResume} 使片段与用户交互（基于包含它的活动被恢复）
* </ol>
*
* <p>当片段不再使用时，执行下述一系列的反向回调方法：
*
* <ol>
* <li> {@link #onPause} 片段不再与用户交互，
* 因为活动暂停或者活动通过片段操作正在编辑它。
* <li> {@link #onStop} 片段的用户不再可见，
* 因为活动已停止或者活动通过片段操作正在编辑它。
* <li> {@link #onDestroyView} 允许片段清理关联到它的视图的资源。
* <li> {@link #onDestroy} 调用来最终清理片段的状态。
* <li> {@link #onDetach} 在片段不再关联到活动的前一刻调用。
* </ol>
*
* <a name="Layout"></a>
* <h3>布局</h3>
*
* <p>片段可以作为你的应用布局的一部分，允许你更好的模块化你的代码。
* 并且更容易在运行中调整你的用户界面。作为示例，我们来看一个简单的程序，
* 它包括项目列表并可以显示每条的详细信息。</p>
*
* <p>活动的布局 XML 文件中可以包含 <code><fragment></code> 标签，
* 用于在布局中嵌入片段实例。例如，这是嵌入了一个片段的简单布局：</p>
*
* {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout}
*
* <p>布局以正常的方式装入活动：</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java
* main}
*
* <p>相当简单的标题片段，显示了标题列表，它的大多数工作依赖于
* {@link ListFragment}。注意点击条目的实现：依赖于当前活动的布局，
* 它也可以创建并显示一个新的片段，并在其中显示相信信息（后面会详细讨论），
* 或者启动新的活动来显示详细信息。</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java
* titles}
*
* <p>详细片段显示选中条目的内容，
* 仅仅是基于应用内部的字符串数组的索引显示文本字符串：</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java
* details}
*
* <p>当用户点击标题时，当前活动没有显示详细信息的容器，
* 因此标题片段的点击代码启动新的活动来显示详细片段：</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java
* details_activity}
*
* <p>然而，屏幕大小可能足够显示标题列表和当前选中标题的内容。
* 在横屏时使用该布局，该可选布局可以放在 layout-land 目录下：</p>
*
* {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout}
*
* <p>注意如何调整之前的代码来使用该可选 UI 流程：标题片段要将详细片段嵌入到该活动中。
* 如果运行时的配置是在内部显示详细信息，用于显示详细信息的活动会自行终止。
*
* <p>当配置变更导致这些片段的宿主活动重启时，其新实例可能使用缺少一些片段的，
* 与之前不同的布局。这种情况下，之前的所有片段也仍然会在新的实例中被实例化并运行。
* 然而，因为不再关联到 <fragment> 标签，因此在视图层次中不会创建它们的视图，
* 并且 {@link #isInLayout} 会返回 false。（该代码还展示了，如何检测容器中的片段，
* 已经脱离了容器的布局，以及如何避免在这种情况下创建视图层次。）
*
* <p><fragment> 标签的属性，用于控制将片段的视图加入到容器时的
* LayoutParams。它们也可以由片段在 {@link #onInflate} 中作为参数处理。
*
* <p>被实例化的片段必须具有某种唯一的标识符，以便于在容器活动需要销毁并重建时，
* 可以重新与之前的实例建立关联。该操作以如下方式提供：
*
* <ul>
* <li> 如果没有明确的提供，则容器中的视图 ID 作为标识符；
* <li><code>android:tag</code> 属性用在 <fragment> 中，为片段指定标签名；
* <li><code>android:id</code> 属性用在 <fragment> 中，为片段指定标识符。
* </ul>
*
* <a name="BackStack"></a>
* <h3>返回栈</h3>
*
* <p>变更了的片段间的切换可以放在拥有片段的活动内部的返回栈中。
* 当用户按下活动的返回键，返回栈中的内容会在活动执行退出操作之前弹出。
*
* <p>例如，看一下由一个整型参数实例化，并在它的 UI 中的 TextView 中显示其值：</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java
* fragment}
*
* <p>创建片段的新实例，替换任何当前显示的片段实例，并推送变更到返回栈中的函数可以这样写：
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java
* add_stack}
*
* <p>每次调用该函数，栈中就多一个新条目，按返回键会弹出，活动的 UI 返回用户之前的状态。
*/
public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListener {
private static final HashMap<String, Class<?>> sClassMap =
new HashMap<String, Class<?>>();
static final int INVALID_STATE = -1; // Invalid state used as a null value.
static final int INITIALIZING = 0; // Not yet created.
static final int CREATED = 1; // Created.
static final int ACTIVITY_CREATED = 2; // The activity has finished its creation.
static final int STOPPED = 3; // Fully created, not started.
static final int STARTED = 4; // Created and started, not resumed.
static final int RESUMED = 5; // Created started and resumed.
int mState = INITIALIZING;
// Non-null if the fragment's view hierarchy is currently animating away,
// meaning we need to wait a bit on completely destroying it. This is the
// animation that is running.
Animator mAnimatingAway;
// If mAnimatingAway != null, this is the state we should move to once the
// animation is done.
int mStateAfterAnimating;
// When instantiated from saved state, this is the saved state.
Bundle mSavedFragmentState;
SparseArray<Parcelable> mSavedViewState;
// Index into active fragment array.
int mIndex = -1;
// Internal unique name for this fragment;
String mWho;
// Construction arguments;
Bundle mArguments;
// Target fragment.
Fragment mTarget;
// For use when retaining a fragment: this is the index of the last mTarget.
int mTargetIndex = -1;
// Target request code.
int mTargetRequestCode;
// True if the fragment is in the list of added fragments.
boolean mAdded;
// If set this fragment is being removed from its activity.
boolean mRemoving;
// True if the fragment is in the resumed state.
boolean mResumed;
// Set to true if this fragment was instantiated from a layout file.
boolean mFromLayout;
// Set to true when the view has actually been inflated in its layout.
boolean mInLayout;
// True if this fragment has been restored from previously saved state.
boolean mRestored;
// Number of active back stack entries this fragment is in.
int mBackStackNesting;
// The fragment manager we are associated with. Set as soon as the
// fragment is used in a transaction; cleared after it has been removed
// from all transactions.
FragmentManagerImpl mFragmentManager;
// Activity this fragment is attached to.
Activity mActivity;
// Private fragment manager for child fragments inside of this one.
FragmentManagerImpl mChildFragmentManager;
// If this Fragment is contained in another Fragment, this is that container.
Fragment mParentFragment;
// The optional identifier for this fragment -- either the container ID if it
// was dynamically added to the view hierarchy, or the ID supplied in
// layout.
int mFragmentId;
// When a fragment is being dynamically added to the view hierarchy, this
// is the identifier of the parent container it is being added to.
int mContainerId;
// The optional named tag for this fragment -- usually used to find
// fragments that are not part of the layout.
String mTag;
// Set to true when the app has requested that this fragment be hidden
// from the user.
boolean mHidden;
// Set to true when the app has requested that this fragment be detached.
boolean mDetached;
// If set this fragment would like its instance retained across
// configuration changes.
boolean mRetainInstance;
// If set this fragment is being retained across the current config change.
boolean mRetaining;
// If set this fragment has menu items to contribute.
boolean mHasMenu;
// Set to true to allow the fragment's menu to be shown.
boolean mMenuVisible = true;
// Used to verify that subclasses call through to super class.
boolean mCalled;
// If app has requested a specific animation, this is the one to use.
int mNextAnim;
// The parent container of the fragment after dynamically added to UI.
ViewGroup mContainer;
// The View generated for this fragment.
View mView;
// Whether this fragment should defer starting until after other fragments
// have been started and their loaders are finished.
boolean mDeferStart;
// Hint provided by the app that this fragment is currently visible to the user.
boolean mUserVisibleHint = true;
LoaderManagerImpl mLoaderManager;
boolean mLoadersStarted;
boolean mCheckedForLoaderManager;
/**
* 通过 {@link FragmentManager#saveFragmentInstanceState(Fragment)
* FragmentManager.saveFragmentInstanceState} 函数从片段实例中取得的状态信息。
*/
public static class SavedState implements Parcelable {
final Bundle mState;
SavedState(Bundle state) {
mState = state;
}
SavedState(Parcel in, ClassLoader loader) {
mState = in.readBundle();
if (loader != null && mState != null) {
mState.setClassLoader(loader);
}
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeBundle(mState);
}
public static final Parcelable.ClassLoaderCreator<SavedState> CREATOR
= new Parcelable.ClassLoaderCreator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in, null);
}
public SavedState createFromParcel(Parcel in, ClassLoader loader) {
return new SavedState(in, loader);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
/**
* 当实例化失败时，由 {@link Fragment#instantiate(Context, String, Bundle)} 抛出。
*/
static public class InstantiationException extends AndroidRuntimeException {
public InstantiationException(String msg, Exception cause) {
super(msg, cause);
}
}
/**
* 缺省构造函数。 <strong>每个</strong> 片段都必须有一个空构造函数，
* 以便在恢复活动状态时可以实例化它。强烈建议不要在子类中其它包含
* 参数的构造函数，因为在片段重新实例化时不会调用这些函数；
* 作为代替，调用者通过 {@link #setArguments} 提供参数，
* 随后片段通过 {@link #getArguments} 取得它们。
*
* <p>应用一般不应该实现构造函数。片段准备好后，最先执行的应用代码在
* {@link #onAttach(Activity)} 方法中，这是片段真正与活动关联的时间点。
* 一些应用可能也想实现 {@link #onInflate} 方法，取得布局资源的属性，
* 那么应该注意，因为该事件发生在片段关联到活动之后。
*/
public Fragment() {
}
/**
* 与 {@link #instantiate(Context, String, Bundle)} 类似，Bundle 参数为空。
*/
public static Fragment instantiate(Context context, String fname) {
return instantiate(context, fname, null);
}
/**
* 使用给定类名创建片段的新实例。 这与调用其空构造函数是一样的。
*
* @param context 用于实例化片段的应用程序上下文。
* 现在仅用于取得ClassLoader。
* @param fname 要实例化的片段的类名。
* @param args 提供给片段的参数捆包 Bundle，
* 可以通过 {@link #getArguments()} 取得。可以为空。
* @return 返回新的片段实例。
* @throws InstantiationException 当实例化片段类失败时抛出。这是运行时异常，
* 一般不会发生。
*/
public static Fragment instantiate(Context context, String fname, Bundle args) {
try {
Class<?> clazz = sClassMap.get(fname);
if (clazz == null) {
// Class not found in the cache, see if it's real, and try to add it
clazz = context.getClassLoader().loadClass(fname);
sClassMap.put(fname, clazz);
}
Fragment f = (Fragment)clazz.newInstance();
if (args != null) {
args.setClassLoader(f.getClass().getClassLoader());
f.mArguments = args;
}
return f;
} catch (ClassNotFoundException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
} catch (java.lang.InstantiationException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
} catch (IllegalAccessException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
}
}
final void restoreViewState(Bundle savedInstanceState) {
if (mSavedViewState != null) {
mView.restoreHierarchyState(mSavedViewState);
mSavedViewState = null;
}
mCalled = false;
onViewStateRestored(savedInstanceState);
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onViewStateRestored()");
}
}
final void setIndex(int index, Fragment parent) {
mIndex = index;
if (parent != null) {
mWho = parent.mWho + ":" + mIndex;
} else {
mWho = "android:fragment:" + mIndex;
}
}
final boolean isInBackStack() {
return mBackStackNesting > 0;
}
/**
* 子类不可覆盖 equals() 方法。
*/
@Override final public boolean equals(Object o) {
return super.equals(o);
}
/**
* 子类不可覆盖 hashCode() 方法。
*/
@Override final public int hashCode() {
return super.hashCode();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(128);
DebugUtils.buildShortClassTag(this, sb);
if (mIndex >= 0) {
sb.append(" #");
sb.append(mIndex);
}
if (mFragmentId != 0) {
sb.append(" id=0x");
sb.append(Integer.toHexString(mFragmentId));
}
if (mTag != null) {
sb.append(" ");
sb.append(mTag);
}
sb.append('}');
return sb.toString();
}
/**
* 返回该片段的已知标识符。它是在布局中指定的 android:id 的值，
* 或添加片段时的容器视图 ID。
*/
final public int getId() {
return mFragmentId;
}
/**
* 取得片段的标签名，如果指定了。
*/
final public String getTag() {
return mTag;
}
/**
* 为片段提供构造参数。该方法只能在片段关联到活动之前调用，就是说，
* 你应该在构造片段后立即调用它。在片段销毁和重建之间该参数得到保持。
*/
public void setArguments(Bundle args) {
if (mIndex >= 0) {
throw new IllegalStateException("Fragment already active");
}
mArguments = args;
}
/**
* 返回片段实例化时得到的参数。
*/
final public Bundle getArguments() {
return mArguments;
}
/**
* 设置片段首次构建后，用于恢复自己的初始保存状态，作为
* {@link FragmentManager#saveFragmentInstanceState(Fragment)
* FragmentManager.saveFragmentInstanceState} 的返回值。
*
* @param state 用于恢复的片段状态。
*/
public void setInitialSavedState(SavedState state) {
if (mIndex >= 0) {
throw new IllegalStateException("Fragment already active");
}
mSavedFragmentState = state != null && state.mState != null
? state.mState : null;
}
/**
* 该片段的可选目标。 可以用于，比如当片段由其它片段启动，
* 在处理完后，要将结果返回给最初片段。这里设置的目标，
* 通过 {@link FragmentManager#putFragment
* FragmentManager.putFragment()} 在各个实例间保持。
*
* @param fragment 该对象的目标片段。
* @param requestCode 可选的请求代码，便于在之后的回调函数
* {@link #onActivityResult(int, int, Intent)} 中处理。
*/
public void setTargetFragment(Fragment fragment, int requestCode) {
mTarget = fragment;
mTargetRequestCode = requestCode;
}
/**
* 返回由 {@link #setTargetFragment} 设置的目标片段。
*/
final public Fragment getTargetFragment() {
return mTarget;
}
/**
* 返回由 {@link #setTargetFragment} 设置的请求代码。
*/
final public int getTargetRequestCode() {
return mTargetRequestCode;
}
/**
* 返回与该片段关联的活动。
*/
final public Activity getActivity() {
return mActivity;
}
/**
* 返回 <code>getActivity().getResources()</code> 的结果。
*/
final public Resources getResources() {
if (mActivity == null) {
throw new IllegalStateException("Fragment " + this + " not attached to Activity");
}
return mActivity.getResources();
}
/**
* 返回应用包的默认字符串表中已本地化、样式化完毕的 CharSequence。
*
* @param resId CharSequence 文本的资源标识符
*/
public final CharSequence getText(int resId) {
return getResources().getText(resId);
}
/**
* 返回应用包的默认字符串表中已本地化的字符串。
*
* @param resId 字符串的资源标识符
*/
public final String getString(int resId) {
return getResources().getString(resId);
}
/**
* 返回应用包的默认字符串表中已本地化，并已格式化的字符串，
* 格式化参数在 {@link java.util.Formatter} 和
* {@link java.lang.String#format} 中定义。
*
* @param resId 格式化字符串的资源标识符
* @param formatArgs 格式化参数
*/
public final String getString(int resId, Object... formatArgs) {
return getResources().getString(resId, formatArgs);
}
/**
* 返回用于与片段交互的，关联到该片段所在活动的 FragmentManager。
* 注意，从片段放入 {@link FragmentTransaction} 到提交并关联到活动期间，
* 该值先于 {@link #getActivity()} 成为非空。
*
* <p>如果该片段是其它片段的子片段，这里返回的 FragmentManager
* 是其父片段的 {@link #getChildFragmentManager()} 的返回值。
*/
final public FragmentManager getFragmentManager() {
return mFragmentManager;
}
/**
* 为放置和管理本片段内部的片段，返回私有 FragmentManager。
*/
final public FragmentManager getChildFragmentManager() {
if (mChildFragmentManager == null) {
instantiateChildFragmentManager();
if (mState >= RESUMED) {
mChildFragmentManager.dispatchResume();
} else if (mState >= STARTED) {
mChildFragmentManager.dispatchStart();
} else if (mState >= ACTIVITY_CREATED) {
mChildFragmentManager.dispatchActivityCreated();
} else if (mState >= CREATED) {
mChildFragmentManager.dispatchCreate();
}
}
return mChildFragmentManager;
}
/**
* 返回包含此片段的父片段。 如果片段直接关联到活动，返回空。
*/
final public Fragment getParentFragment() {
return mParentFragment;
}
/**
* 如果当前片段已添加到活动则返回真。
*/
final public boolean isAdded() {
return mActivity != null && mAdded;
}
/**
* 如果片段已经明确的与 UI 解除了关联，返回真。意味着已经调用了
* {@link FragmentTransaction#detach(Fragment)
* FragmentTransaction.detach(Fragment)} 。
*/
final public boolean isDetached() {
return mDetached;
}
/**
* 如果片段已经从活动中移除，返回真。这<em>不</em>意味着活动正要结束。
* 而是代表片段处于从活动中被移除的过程中。
*/
final public boolean isRemoving() {
return mRemoving;
}
/**
* 如果片段通过 <fragment> 标签，作为活动布局的一部分包含在视图层次中，
* 返回真。通过 <fragment> 标签创建的片段，该值总为真，<em>除了</em>
* 片段从之前的状态恢复后，没有出现在当前状态的布局中的情况以外。
*/
final public boolean isInLayout() {
return mInLayout;
}
/**
* 当片段处于 Resumed 状态时，返回真。 在 {@link #onResume()} 和
* {@link #onPause()} 期间，该值为真。
*/
final public boolean isResumed() {
return mResumed;
}
/**
* 当片段对用户可见时，返回真。 意味着：(1) 已添加，(2) 视图已关联到窗口，
* (3) 没有处于隐藏状态。
*/
final public boolean isVisible() {
return isAdded() && !isHidden() && mView != null
&& mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE;
}
/**
* 当片段处于隐藏状态时返回真。 默认片段是显示的。通过 {@link #onHiddenChanged}
* 可以检知该状态的变更。注意，隐藏状态与其它状态是叠加的——就是说，
* 片段要对用户可见，必须处于启动和非隐藏状态。
*/
final public boolean isHidden() {
return mHidden;
}
/**
* Called when the hidden state (as returned by {@link #isHidden()} of
* the fragment has changed. Fragments start out not hidden; this will
* be called whenever the fragment changes state from that.
* @param hidden True if the fragment is now hidden, false if it is not
* visible.
*/
public void onHiddenChanged(boolean hidden) {
}
/**
* 控制片段的实例在活动重建之间是否保持（比如配置变更时）。
* 它只能用于不在返回栈中的片段。如果设置为真，在活动重新创建时，
* 片段的生命周期会稍有不同：
* <ul>
* <li> 不会调用 {@link #onDestroy()} 方法 (但仍然会调用 {@link #onDetach()}，
* 因为片段已经解除了与当前活动的关联)。
* <li> 不会调用 {@link #onCreate(Bundle)}，因为片段不会重新创建。
* <li> <b>仍然</b>会调用 {@link #onAttach(Activity)} 和
* {@link #onActivityCreated(Bundle)} 。
* </ul>
*/
public void setRetainInstance(boolean retain) {
if (retain && mParentFragment != null) {
throw new IllegalStateException(
"Can't retain fragements that are nested in other fragments");
}
mRetainInstance = retain;
}
final public boolean getRetainInstance() {
return mRetainInstance;
}
/**
* 指明该片段通过接收对 {@link #onCreateOptionsMenu} 及相关方法的调用，
* 来添加选项菜单。
*
* @param hasMenu 如果为真，则该片段会添加菜单项。
*/
public void setHasOptionsMenu(boolean hasMenu) {
if (mHasMenu != hasMenu) {
mHasMenu = hasMenu;
if (isAdded() && !isHidden()) {
mFragmentManager.invalidateOptionsMenu();
}
}
}
/**
* 设置该片段的菜单是否可见。 如你所知，在片段添加到视图层次、
* 用户还没有看到它的时候，它的菜单项是不应该显示的。
*
* @param menuVisible 默认值为真，就是说通常片段的菜单是显示的。
* 如果为假，则用户看不到菜单。
*/
public void setMenuVisibility(boolean menuVisible) {
if (mMenuVisible != menuVisible) {
mMenuVisible = menuVisible;
if (mHasMenu && isAdded() && !isHidden()) {
mFragmentManager.invalidateOptionsMenu();
}
}
}
/**
* 向系统中设置当前该片段对用户是否可见的标志。 该设置默认为真，
* 该值在片段状态保存和恢复期间得到保持。
*
* <p>应用可以设置该值为假，代表片段滚动到可视区域外，或者对用户不直接可见。
* 该值可用于系统对片段生命周期更新、载入顺序等操作的优化。</p>
*
* @param isVisibleToUser 为真，意味着片段UI当前对用户可见（默认值），
* 假代表不可见。
*/
public void setUserVisibleHint(boolean isVisibleToUser) {
if (!mUserVisibleHint && isVisibleToUser && mState < STARTED) {
mFragmentManager.performPendingDeferredStart(this);
}
mUserVisibleHint = isVisibleToUser;
mDeferStart = !isVisibleToUser;
}
/**
* @return 该片段用户可见标志的当前值。
* @see #setUserVisibleHint(boolean)
*/
public boolean getUserVisibleHint() {
return mUserVisibleHint;
}
/**
* 返回当前片段的 LoaderManager，必要时创建它。
*/
public LoaderManager getLoaderManager() {
if (mLoaderManager != null) {
return mLoaderManager;
}
if (mActivity == null) {
throw new IllegalStateException("Fragment " + this + " not attached to Activity");
}
mCheckedForLoaderManager = true;
mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, true);
return mLoaderManager;
}
/**
* 调用包含该片段活动的 {@link Activity#startActivity(Intent)}。
*
* @param intent 执行的意图
*/
public void startActivity(Intent intent) {
startActivity(intent, null);
}
/**
* 调用包含该片段活动的 {@link Activity#startActivity(Intent, Bundle)}。
*
* @param intent 执行的意图
* @param options 活动如何启动的附加选项。
* 更多细节参见 {@link android.content.Context#startActivity(Intent, Bundle)
* Context.startActivity(Intent, Bundle)}。
*/
public void startActivity(Intent intent, Bundle options) {
if (mActivity == null) {
throw new IllegalStateException("Fragment " + this + " not attached to Activity");
}
if (options != null) {
mActivity.startActivityFromFragment(this, intent, -1, options);
} else {
// Note we want to go through this call for compatibility with
// applications that may have overridden the method.
mActivity.startActivityFromFragment(this, intent, -1);
}
}
/**
* 调用包含该片段活动的 {@link Activity#startActivityForResult(Intent, int)} 方法。
*/
public void startActivityForResult(Intent intent, int requestCode) {
startActivityForResult(intent, requestCode, null);
}
/**
* 调用包含该片段活动的 {@link Activity#startActivityForResult(Intent, int, Bundle)} 方法。
*/
public void startActivityForResult(Intent intent, int requestCode, Bundle options) {
if (mActivity == null) {
throw new IllegalStateException("Fragment " + this + " not attached to Activity");
}
if (options != null) {
mActivity.startActivityFromFragment(this, intent, requestCode, options);
} else {
// Note we want to go through this call for compatibility with
// applications that may have overridden the method.
mActivity.startActivityFromFragment(this, intent, requestCode, options);
}
}
/**
* 接收之前调用 {@link #startActivityForResult(Intent, int)} 的结果。
* 该方法跟随关联的活动的 API {@link Activity#onActivityResult(int, int, Intent)} 被调用。
*
* @param requestCode 调用 startActivityForResult() 时指定的整型请求代码，
* 允许你识别结果来自哪里。
* @param resultCode 子活动通过 setResult() 设置的整型返回值。
* @param data A用于返回结果数据给调用者的意图（意图的“extras”可以存放各种数据）。
*/
public void onActivityResult(int requestCode, int resultCode, Intent data) {
}
/**
* @hide Hack so that DialogFragment can make its Dialog before creating
* its views, and the view construction can use the dialog's context for
* inflation. Maybe this should become a public API. Note sure.
*/
public LayoutInflater getLayoutInflater(Bundle savedInstanceState) {
return mActivity.getLayoutInflater();
}
/**
* @deprecated 由 {@link #onInflate(Activity, AttributeSet, Bundle)} 代替。
*/
@Deprecated
public void onInflate(AttributeSet attrs, Bundle savedInstanceState) {
mCalled = true;
}
/**
* 在片段作为视图布局的一部分创建时调用，通常是在设置活动视图时。
* 该函数在根据布局文件的 <fragment> 标签创建片段后立即调用。
* 注意，该函数在片段的 {@link #onAttach(Activity)} <em>之前</em>
* 调用；你在这里能做的只有解析属性并保存。
*
* <p>该调用在每次片段展开布局时都执行，即使在使用保存的状态生成新实例时。
* 通常每次都实际执行参数解析工作，以便反应配置时的变更。</p>
*
* <p>这是片段的典型实现，可以取得通过属性和 {@link #getArguments()} 提供的参数。</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java
* fragment}
*
* <p>注意，XML 属性使用 "styleable" 资源来解析。这里定义了用到的样式。</p>
*
* {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments}
*
* <p>片段可以在活动内容布局中像这样通过标签定义：</p>
*
* {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes}
*
* <p>片段也可以根据运行时给定的参数捆包中的参数动态创建；这是在容器活动创建时的示例：</p>
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java
* create}
*
* @param activity 展开该片段的活动。
* @param attrs 被创建的片段标签中的属性。
* @param savedInstanceState 如果片段从之前保存的状态重新创建，这里是其状态。
*/
public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) {
onInflate(attrs, savedInstanceState);
mCalled = true;
}
/**
* 片段首次关联到活动时调用。该调用之后调用 {@link #onCreate(Bundle)}。
*/
public void onAttach(Activity activity) {
mCalled = true;
}
/**
* 当片段载入动画时调用。
*/
public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
return null;
}
/**
* 片段最初创建时调用。 它在 {@link #onAttach(Activity)} 之后，
* {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} 之前调用。
*
* <p>注意，该函数可能在片段的活动仍处于创建的过程中时调用。
* 因此，你不能假设在这个时点，活动内容的视图层次已经初始化了。
* 如果你想在活动创建时执行，参见 {@link #onActivityCreated(Bundle)}。
*
* @param savedInstanceState 如果片段由之前保存的状态重新创建，该值为其状态。
*/
public void onCreate(Bundle savedInstanceState) {
mCalled = true;
}
/**
* Called to have the fragment instantiate its user interface view.
* This is optional, and non-graphical fragments can return null (which
* is the default implementation). This will be called between
* {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}.
*
* <p>If you return a View from here, you will later be called in
* {@link #onDestroyView} when the view is being released.
*
* @param inflater The LayoutInflater object that can be used to inflate
* any views in the fragment,
* @param container If non-null, this is the parent view that the fragment's
* UI should be attached to. The fragment should not add the view itself,
* but this can be used to generate the LayoutParams of the view.
* @param savedInstanceState If non-null, this fragment is being re-constructed
* from a previous saved state as given here.
*
* @return Return the View for the fragment's UI, or null.
*/
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return null;
}
/**
* Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}
* has returned, but before any saved state has been restored in to the view.
* This gives subclasses a chance to initialize themselves once
* they know their view hierarchy has been completely created. The fragment's
* view hierarchy is not however attached to its parent at this point.
* @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}.
* @param savedInstanceState If non-null, this fragment is being re-constructed
* from a previous saved state as given here.
*/
public void onViewCreated(View view, Bundle savedInstanceState) {
}
/**
* Get the root view for the fragment's layout (the one returned by {@link #onCreateView}),
* if provided.
*
* @return The fragment's root view, or null if it has no layout.
*/
public View getView() {
return mView;
}
/**
* Called when the fragment's activity has been created and this
* fragment's view hierarchy instantiated. It can be used to do final
* initialization once these pieces are in place, such as retrieving
* views or restoring state. It is also useful for fragments that use
* {@link #setRetainInstance(boolean)} to retain their instance,
* as this callback tells the fragment when it is fully associated with
* the new activity instance. This is called after {@link #onCreateView}
* and before {@link #onViewStateRestored(Bundle)}.
*
* @param savedInstanceState If the fragment is being re-created from
* a previous saved state, this is the state.
*/
public void onActivityCreated(Bundle savedInstanceState) {
mCalled = true;
}
/**
* Called when all saved state has been restored into the view hierarchy
* of the fragment. This can be used to do initialization based on saved
* state that you are letting the view hierarchy track itself, such as
* whether check box widgets are currently checked. This is called
* after {@link #onActivityCreated(Bundle)} and before
* {@link #onStart()}.
*
* @param savedInstanceState If the fragment is being re-created from
* a previous saved state, this is the state.
*/
public void onViewStateRestored(Bundle savedInstanceState) {
mCalled = true;
}
/**
* Called when the Fragment is visible to the user. This is generally
* tied to {@link Activity#onStart() Activity.onStart} of the containing
* Activity's lifecycle.
*/
public void onStart() {
mCalled = true;
if (!mLoadersStarted) {
mLoadersStarted = true;
if (!mCheckedForLoaderManager) {
mCheckedForLoaderManager = true;
mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false);
}
if (mLoaderManager != null) {
mLoaderManager.doStart();
}
}
}
/**
* Called when the fragment is visible to the user and actively running.
* This is generally
* tied to {@link Activity#onResume() Activity.onResume} of the containing
* Activity's lifecycle.
*/
public void onResume() {
mCalled = true;
}
/**
* Called to ask the fragment to save its current dynamic state, so it
* can later be reconstructed in a new instance of its process is
* restarted. If a new instance of the fragment later needs to be
* created, the data you place in the Bundle here will be available
* in the Bundle given to {@link #onCreate(Bundle)},
* {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and
* {@link #onActivityCreated(Bundle)}.
*
* <p>This corresponds to {@link Activity#onSaveInstanceState(Bundle)
* Activity.onSaveInstanceState(Bundle)} and most of the discussion there
* applies here as well. Note however: <em>this method may be called
* at any time before {@link #onDestroy()}</em>. There are many situations
* where a fragment may be mostly torn down (such as when placed on the
* back stack with no UI showing), but its state will not be saved until
* its owning activity actually needs to save its state.
*
* @param outState Bundle in which to place your saved state.
*/
public void onSaveInstanceState(Bundle outState) {
}
public void onConfigurationChanged(Configuration newConfig) {
mCalled = true;
}
/**
* Called when the Fragment is no longer resumed. This is generally
* tied to {@link Activity#onPause() Activity.onPause} of the containing
* Activity's lifecycle.
*/
public void onPause() {
mCalled = true;
}
/**
* Called when the Fragment is no longer started. This is generally
* tied to {@link Activity#onStop() Activity.onStop} of the containing
* Activity's lifecycle.
*/
public void onStop() {
mCalled = true;
}
public void onLowMemory() {
mCalled = true;
}
public void onTrimMemory(int level) {
mCalled = true;
}
/**
* Called when the view previously created by {@link #onCreateView} has
* been detached from the fragment. The next time the fragment needs
* to be displayed, a new view will be created. This is called
* after {@link #onStop()} and before {@link #onDestroy()}. It is called
* <em>regardless</em> of whether {@link #onCreateView} returned a
* non-null view. Internally it is called after the view's state has
* been saved but before it has been removed from its parent.
*/
public void onDestroyView() {
mCalled = true;
}
/**
* Called when the fragment is no longer in use. This is called
* after {@link #onStop()} and before {@link #onDetach()}.
*/
public void onDestroy() {
mCalled = true;
//Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager
// + " mLoaderManager=" + mLoaderManager);
if (!mCheckedForLoaderManager) {
mCheckedForLoaderManager = true;
mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false);
}
if (mLoaderManager != null) {
mLoaderManager.doDestroy();
}
}
/**
* Called by the fragment manager once this fragment has been removed,
* so that we don't have any left-over state if the application decides
* to re-use the instance. This only clears state that the framework
* internally manages, not things the application sets.
*/
void initState() {
mIndex = -1;
mWho = null;
mAdded = false;
mRemoving = false;
mResumed = false;
mFromLayout = false;
mInLayout = false;
mRestored = false;
mBackStackNesting = 0;
mFragmentManager = null;
mActivity = null;
mFragmentId = 0;
mContainerId = 0;
mTag = null;
mHidden = false;
mDetached = false;
mRetaining = false;
mLoaderManager = null;
mLoadersStarted = false;
mCheckedForLoaderManager = false;
}
/**
* Called when the fragment is no longer attached to its activity. This
* is called after {@link #onDestroy()}.
*/
public void onDetach() {
mCalled = true;
}
/**
* Initialize the contents of the Activity's standard options menu. You
* should place your menu items in to <var>menu</var>. For this method
* to be called, you must have first called {@link #setHasOptionsMenu}. See
* {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu}
* for more information.
*
* @param menu The options menu in which you place your items.
*
* @see #setHasOptionsMenu
* @see #onPrepareOptionsMenu
* @see #onOptionsItemSelected
*/
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
}
/**
* Prepare the Screen's standard options menu to be displayed. This is
* called right before the menu is shown, every time it is shown. You can
* use this method to efficiently enable/disable items or otherwise
* dynamically modify the contents. See
* {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu}
* for more information.
*
* @param menu The options menu as last shown or first initialized by
* onCreateOptionsMenu().
*
* @see #setHasOptionsMenu
* @see #onCreateOptionsMenu
*/
public void onPrepareOptionsMenu(Menu menu) {
}
/**
* Called when this fragment's option menu items are no longer being
* included in the overall options menu. Receiving this call means that
* the menu needed to be rebuilt, but this fragment's items were not
* included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)}
* was not called).
*/
public void onDestroyOptionsMenu() {
}
/**
* This hook is called whenever an item in your options menu is selected.
* The default implementation simply returns false to have the normal
* processing happen (calling the item's Runnable or sending a message to
* its Handler as appropriate). You can use this method for any items
* for which you would like to do processing without those other
* facilities.
*
* <p>Derived classes should call through to the base class for it to
* perform the default menu handling.
*
* @param item The menu item that was selected.
*
* @return boolean Return false to allow normal menu processing to
* proceed, true to consume it here.
*
* @see #onCreateOptionsMenu
*/
public boolean onOptionsItemSelected(MenuItem item) {
return false;
}
/**
* This hook is called whenever the options menu is being closed (either by the user canceling
* the menu with the back/menu button, or when an item is selected).
*
* @param menu The options menu as last shown or first initialized by
* onCreateOptionsMenu().
*/
public void onOptionsMenuClosed(Menu menu) {
}
/**
* Called when a context menu for the {@code view} is about to be shown.
* Unlike {@link #onCreateOptionsMenu}, this will be called every
* time the context menu is about to be shown and should be populated for
* the view (or item inside the view for {@link AdapterView} subclasses,
* this can be found in the {@code menuInfo})).
* <p>
* Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an
* item has been selected.
* <p>
* The default implementation calls up to
* {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though
* you can not call this implementation if you don't want that behavior.
* <p>
* It is not safe to hold onto the context menu after this method returns.
* {@inheritDoc}
*/
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
getActivity().onCreateContextMenu(menu, v, menuInfo);
}
/**
* Registers a context menu to be shown for the given view (multiple views
* can show the context menu). This method will set the
* {@link OnCreateContextMenuListener} on the view to this fragment, so
* {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be
* called when it is time to show the context menu.
*
* @see #unregisterForContextMenu(View)
* @param view The view that should show a context menu.
*/
public void registerForContextMenu(View view) {
view.setOnCreateContextMenuListener(this);
}
/**
* Prevents a context menu to be shown for the given view. This method will
* remove the {@link OnCreateContextMenuListener} on the view.
*
* @see #registerForContextMenu(View)
* @param view The view that should stop showing a context menu.
*/
public void unregisterForContextMenu(View view) {
view.setOnCreateContextMenuListener(null);
}
/**
* This hook is called whenever an item in a context menu is selected. The
* default implementation simply returns false to have the normal processing
* happen (calling the item's Runnable or sending a message to its Handler
* as appropriate). You can use this method for any items for which you
* would like to do processing without those other facilities.
* <p>
* Use {@link MenuItem#getMenuInfo()} to get extra information set by the
* View that added this menu item.
* <p>
* Derived classes should call through to the base class for it to perform
* the default menu handling.
*
* @param item The context menu item that was selected.
* @return boolean Return false to allow normal context menu processing to
* proceed, true to consume it here.
*/
public boolean onContextItemSelected(MenuItem item) {
return false;
}
/**
* Print the Fragments's state into the given stream.
*
* @param prefix Text to print at the front of each line.
* @param fd The raw file descriptor that the dump is being sent to.
* @param writer The PrintWriter to which you should dump your state. This will be
* closed for you after you return.
* @param args additional arguments to the dump request.
*/
public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
writer.print(prefix); writer.print("mFragmentId=#");
writer.print(Integer.toHexString(mFragmentId));
writer.print(" mContainerId=#");
writer.print(Integer.toHexString(mContainerId));
writer.print(" mTag="); writer.println(mTag);
writer.print(prefix); writer.print("mState="); writer.print(mState);
writer.print(" mIndex="); writer.print(mIndex);
writer.print(" mWho="); writer.print(mWho);
writer.print(" mBackStackNesting="); writer.println(mBackStackNesting);
writer.print(prefix); writer.print("mAdded="); writer.print(mAdded);
writer.print(" mRemoving="); writer.print(mRemoving);
writer.print(" mResumed="); writer.print(mResumed);
writer.print(" mFromLayout="); writer.print(mFromLayout);
writer.print(" mInLayout="); writer.println(mInLayout);
writer.print(prefix); writer.print("mHidden="); writer.print(mHidden);
writer.print(" mDetached="); writer.print(mDetached);
writer.print(" mMenuVisible="); writer.print(mMenuVisible);
writer.print(" mHasMenu="); writer.println(mHasMenu);
writer.print(prefix); writer.print("mRetainInstance="); writer.print(mRetainInstance);
writer.print(" mRetaining="); writer.print(mRetaining);
writer.print(" mUserVisibleHint="); writer.println(mUserVisibleHint);
if (mFragmentManager != null) {
writer.print(prefix); writer.print("mFragmentManager=");
writer.println(mFragmentManager);
}
if (mActivity != null) {
writer.print(prefix); writer.print("mActivity=");
writer.println(mActivity);
}
if (mParentFragment != null) {
writer.print(prefix); writer.print("mParentFragment=");
writer.println(mParentFragment);
}
if (mArguments != null) {
writer.print(prefix); writer.print("mArguments="); writer.println(mArguments);
}
if (mSavedFragmentState != null) {
writer.print(prefix); writer.print("mSavedFragmentState=");
writer.println(mSavedFragmentState);
}
if (mSavedViewState != null) {
writer.print(prefix); writer.print("mSavedViewState=");
writer.println(mSavedViewState);
}
if (mTarget != null) {
writer.print(prefix); writer.print("mTarget="); writer.print(mTarget);
writer.print(" mTargetRequestCode=");
writer.println(mTargetRequestCode);
}
if (mNextAnim != 0) {
writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim);
}
if (mContainer != null) {
writer.print(prefix); writer.print("mContainer="); writer.println(mContainer);
}
if (mView != null) {
writer.print(prefix); writer.print("mView="); writer.println(mView);
}
if (mAnimatingAway != null) {
writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway);
writer.print(prefix); writer.print("mStateAfterAnimating=");
writer.println(mStateAfterAnimating);
}
if (mLoaderManager != null) {
writer.print(prefix); writer.println("Loader Manager:");
mLoaderManager.dump(prefix + " ", fd, writer, args);
}
if (mChildFragmentManager != null) {
writer.print(prefix); writer.println("Child " + mChildFragmentManager + ":");
mChildFragmentManager.dump(prefix + " ", fd, writer, args);
}
}
Fragment findFragmentByWho(String who) {
if (who.equals(mWho)) {
return this;
}
if (mChildFragmentManager != null) {
return mChildFragmentManager.findFragmentByWho(who);
}
return null;
}
void instantiateChildFragmentManager() {
mChildFragmentManager = new FragmentManagerImpl();
mChildFragmentManager.attachActivity(mActivity, new FragmentContainer() {
@Override
public View findViewById(int id) {
if (mView == null) {
throw new IllegalStateException("Fragment does not have a view");
}
return mView.findViewById(id);
}
}, this);
}
void performCreate(Bundle savedInstanceState) {
if (mChildFragmentManager != null) {
mChildFragmentManager.noteStateNotSaved();
}
mCalled = false;
onCreate(savedInstanceState);
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onCreate()");
}
if (savedInstanceState != null) {
Parcelable p = savedInstanceState.getParcelable(Activity.FRAGMENTS_TAG);
if (p != null) {
if (mChildFragmentManager == null) {
instantiateChildFragmentManager();
}
mChildFragmentManager.restoreAllState(p, null);
mChildFragmentManager.dispatchCreate();
}
}
}
View performCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (mChildFragmentManager != null) {
mChildFragmentManager.noteStateNotSaved();
}
return onCreateView(inflater, container, savedInstanceState);
}
void performActivityCreated(Bundle savedInstanceState) {
if (mChildFragmentManager != null) {
mChildFragmentManager.noteStateNotSaved();
}
mCalled = false;
onActivityCreated(savedInstanceState);
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onActivityCreated()");
}
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchActivityCreated();
}
}
void performStart() {
if (mChildFragmentManager != null) {
mChildFragmentManager.noteStateNotSaved();
mChildFragmentManager.execPendingActions();
}
mCalled = false;
onStart();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onStart()");
}
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchStart();
}
if (mLoaderManager != null) {
mLoaderManager.doReportStart();
}
}
void performResume() {
if (mChildFragmentManager != null) {
mChildFragmentManager.noteStateNotSaved();
mChildFragmentManager.execPendingActions();
}
mCalled = false;
onResume();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onResume()");
}
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchResume();
mChildFragmentManager.execPendingActions();
}
}
void performConfigurationChanged(Configuration newConfig) {
onConfigurationChanged(newConfig);
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchConfigurationChanged(newConfig);
}
}
void performLowMemory() {
onLowMemory();
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchLowMemory();
}
}
void performTrimMemory(int level) {
onTrimMemory(level);
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchTrimMemory(level);
}
}
boolean performCreateOptionsMenu(Menu menu, MenuInflater inflater) {
boolean show = false;
if (!mHidden) {
if (mHasMenu && mMenuVisible) {
show = true;
onCreateOptionsMenu(menu, inflater);
}
if (mChildFragmentManager != null) {
show |= mChildFragmentManager.dispatchCreateOptionsMenu(menu, inflater);
}
}
return show;
}
boolean performPrepareOptionsMenu(Menu menu) {
boolean show = false;
if (!mHidden) {
if (mHasMenu && mMenuVisible) {
show = true;
onPrepareOptionsMenu(menu);
}
if (mChildFragmentManager != null) {
show |= mChildFragmentManager.dispatchPrepareOptionsMenu(menu);
}
}
return show;
}
boolean performOptionsItemSelected(MenuItem item) {
if (!mHidden) {
if (mHasMenu && mMenuVisible) {
if (onOptionsItemSelected(item)) {
return true;
}
}
if (mChildFragmentManager != null) {
if (mChildFragmentManager.dispatchOptionsItemSelected(item)) {
return true;
}
}
}
return false;
}
boolean performContextItemSelected(MenuItem item) {
if (!mHidden) {
if (onContextItemSelected(item)) {
return true;
}
if (mChildFragmentManager != null) {
if (mChildFragmentManager.dispatchContextItemSelected(item)) {
return true;
}
}
}
return false;
}
void performOptionsMenuClosed(Menu menu) {
if (!mHidden) {
if (mHasMenu && mMenuVisible) {
onOptionsMenuClosed(menu);
}
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchOptionsMenuClosed(menu);
}
}
}
void performSaveInstanceState(Bundle outState) {
onSaveInstanceState(outState);
if (mChildFragmentManager != null) {
Parcelable p = mChildFragmentManager.saveAllState();
if (p != null) {
outState.putParcelable(Activity.FRAGMENTS_TAG, p);
}
}
}
void performPause() {
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchPause();
}
mCalled = false;
onPause();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onPause()");
}
}
void performStop() {
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchStop();
}
mCalled = false;
onStop();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onStop()");
}
if (mLoadersStarted) {
mLoadersStarted = false;
if (!mCheckedForLoaderManager) {
mCheckedForLoaderManager = true;
mLoaderManager = mActivity.getLoaderManager(mWho, mLoadersStarted, false);
}
if (mLoaderManager != null) {
if (mActivity == null || !mActivity.mChangingConfigurations) {
mLoaderManager.doStop();
} else {
mLoaderManager.doRetain();
}
}
}
}
void performDestroyView() {
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchDestroyView();
}
mCalled = false;
onDestroyView();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onDestroyView()");
}
if (mLoaderManager != null) {
mLoaderManager.doReportNextStart();
}
}
void performDestroy() {
if (mChildFragmentManager != null) {
mChildFragmentManager.dispatchDestroy();
}
mCalled = false;
onDestroy();
if (!mCalled) {
throw new SuperNotCalledException("Fragment " + this
+ " did not call through to super.onDestroy()");
}
}
}