FragmentState.java
/*
* Copyright 2018 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 androidx.fragment.app;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import androidx.annotation.NonNull;
import androidx.lifecycle.Lifecycle;
@SuppressLint("BanParcelableUsage")
final class FragmentState implements Parcelable {
final String mClassName;
final String mWho;
final boolean mFromLayout;
final int mFragmentId;
final int mContainerId;
final String mTag;
final boolean mRetainInstance;
final boolean mRemoving;
final boolean mDetached;
final Bundle mArguments;
final boolean mHidden;
final int mMaxLifecycleState;
Bundle mSavedFragmentState;
FragmentState(Fragment frag) {
mClassName = frag.getClass().getName();
mWho = frag.mWho;
mFromLayout = frag.mFromLayout;
mFragmentId = frag.mFragmentId;
mContainerId = frag.mContainerId;
mTag = frag.mTag;
mRetainInstance = frag.mRetainInstance;
mRemoving = frag.mRemoving;
mDetached = frag.mDetached;
mArguments = frag.mArguments;
mHidden = frag.mHidden;
mMaxLifecycleState = frag.mMaxState.ordinal();
}
FragmentState(Parcel in) {
mClassName = in.readString();
mWho = in.readString();
mFromLayout = in.readInt() != 0;
mFragmentId = in.readInt();
mContainerId = in.readInt();
mTag = in.readString();
mRetainInstance = in.readInt() != 0;
mRemoving = in.readInt() != 0;
mDetached = in.readInt() != 0;
mArguments = in.readBundle();
mHidden = in.readInt() != 0;
mSavedFragmentState = in.readBundle();
mMaxLifecycleState = in.readInt();
}
/**
* Instantiates the Fragment from this state.
*/
@NonNull
Fragment instantiate(@NonNull FragmentFactory fragmentFactory,
@NonNull ClassLoader classLoader) {
Fragment fragment = fragmentFactory.instantiate(classLoader, mClassName);
if (mArguments != null) {
mArguments.setClassLoader(classLoader);
}
fragment.setArguments(mArguments);
fragment.mWho = mWho;
fragment.mFromLayout = mFromLayout;
fragment.mRestored = true;
fragment.mFragmentId = mFragmentId;
fragment.mContainerId = mContainerId;
fragment.mTag = mTag;
fragment.mRetainInstance = mRetainInstance;
fragment.mRemoving = mRemoving;
fragment.mDetached = mDetached;
fragment.mHidden = mHidden;
fragment.mMaxState = Lifecycle.State.values()[mMaxLifecycleState];
if (mSavedFragmentState != null) {
fragment.mSavedFragmentState = mSavedFragmentState;
} else {
// When restoring a Fragment, always ensure we have a
// non-null Bundle so that developers have a signal for
// when the Fragment is being restored
fragment.mSavedFragmentState = new Bundle();
}
return fragment;
}
@NonNull
@Override
public String toString() {
StringBuilder sb = new StringBuilder(128);
sb.append("FragmentState{");
sb.append(mClassName);
sb.append(" (");
sb.append(mWho);
sb.append(")}:");
if (mFromLayout) {
sb.append(" fromLayout");
}
if (mContainerId != 0) {
sb.append(" id=0x");
sb.append(Integer.toHexString(mContainerId));
}
if (mTag != null && !mTag.isEmpty()) {
sb.append(" tag=");
sb.append(mTag);
}
if (mRetainInstance) {
sb.append(" retainInstance");
}
if (mRemoving) {
sb.append(" removing");
}
if (mDetached) {
sb.append(" detached");
}
if (mHidden) {
sb.append(" hidden");
}
return sb.toString();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(mClassName);
dest.writeString(mWho);
dest.writeInt(mFromLayout ? 1 : 0);
dest.writeInt(mFragmentId);
dest.writeInt(mContainerId);
dest.writeString(mTag);
dest.writeInt(mRetainInstance ? 1 : 0);
dest.writeInt(mRemoving ? 1 : 0);
dest.writeInt(mDetached ? 1 : 0);
dest.writeBundle(mArguments);
dest.writeInt(mHidden ? 1 : 0);
dest.writeBundle(mSavedFragmentState);
dest.writeInt(mMaxLifecycleState);
}
public static final Parcelable.Creator<FragmentState> CREATOR =
new Parcelable.Creator<FragmentState>() {
@Override
public FragmentState createFromParcel(Parcel in) {
return new FragmentState(in);
}
@Override
public FragmentState[] newArray(int size) {
return new FragmentState[size];
}
};
}