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 android.util.Log;
import androidx.annotation.NonNull;
@SuppressWarnings("BanParcelableUsage")
@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 mDetached;
final Bundle mArguments;
final boolean mHidden;
Bundle mSavedFragmentState;
Fragment mInstance;
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;
mDetached = frag.mDetached;
mArguments = frag.mArguments;
mHidden = frag.mHidden;
}
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;
mDetached = in.readInt() != 0;
mArguments = in.readBundle();
mHidden = in.readInt() != 0;
mSavedFragmentState = in.readBundle();
}
public Fragment instantiate(@NonNull ClassLoader classLoader,
@NonNull FragmentFactory factory) {
if (mInstance == null) {
if (mArguments != null) {
mArguments.setClassLoader(classLoader);
}
mInstance = factory.instantiate(classLoader, mClassName, mArguments);
mInstance.setArguments(mArguments);
if (mSavedFragmentState != null) {
mSavedFragmentState.setClassLoader(classLoader);
mInstance.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
mInstance.mSavedFragmentState = new Bundle();
}
mInstance.mWho = mWho;
mInstance.mFromLayout = mFromLayout;
mInstance.mRestored = true;
mInstance.mFragmentId = mFragmentId;
mInstance.mContainerId = mContainerId;
mInstance.mTag = mTag;
mInstance.mRetainInstance = mRetainInstance;
mInstance.mDetached = mDetached;
mInstance.mHidden = mHidden;
if (FragmentManagerImpl.DEBUG) {
Log.v(FragmentManagerImpl.TAG, "Instantiated fragment " + mInstance);
}
}
return mInstance;
}
@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(mDetached ? 1 : 0);
dest.writeBundle(mArguments);
dest.writeInt(mHidden ? 1 : 0);
dest.writeBundle(mSavedFragmentState);
}
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];
}
};
}