220 lines
8.0 KiB
Java
220 lines
8.0 KiB
Java
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/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.os.Binder;
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import android.os.IBinder;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.os.RemoteException;
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import android.util.Log;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* This is a copied version of BaseParceledListSlice in framework with hidden API usages
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* removed.
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*
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* Transfer a large list of Parcelable objects across an IPC. Splits into
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* multiple transactions if needed.
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*
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* Caveat: for efficiency and security, all elements must be the same concrete type.
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* In order to avoid writing the class name of each object, we must ensure that
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* each object is the same type, or else unparceling then reparceling the data may yield
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* a different result if the class name encoded in the Parcelable is a Base type.
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* See b/17671747.
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*
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* @hide
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*/
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abstract class BaseMediaParceledListSlice<T> implements Parcelable {
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private static String TAG = "BaseMediaParceledListSlice";
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private static final boolean DEBUG = false;
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/*
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* TODO get this number from somewhere else. For now set it to a quarter of
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* the 1MB limit.
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*/
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// private static final int MAX_IPC_SIZE = IBinder.getSuggestedMaxIpcSizeBytes();
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private static final int MAX_IPC_SIZE = 64 * 1024;
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private final List<T> mList;
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private int mInlineCountLimit = Integer.MAX_VALUE;
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public BaseMediaParceledListSlice(List<T> list) {
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mList = list;
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}
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@SuppressWarnings("unchecked")
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BaseMediaParceledListSlice(Parcel p, ClassLoader loader) {
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final int N = p.readInt();
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mList = new ArrayList<T>(N);
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if (DEBUG) Log.d(TAG, "Retrieving " + N + " items");
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if (N <= 0) {
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return;
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}
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Parcelable.Creator<?> creator = readParcelableCreator(p, loader);
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Class<?> listElementClass = null;
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int i = 0;
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while (i < N) {
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if (p.readInt() == 0) {
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break;
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}
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final T parcelable = readCreator(creator, p, loader);
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if (listElementClass == null) {
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listElementClass = parcelable.getClass();
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} else {
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verifySameType(listElementClass, parcelable.getClass());
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}
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mList.add(parcelable);
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if (DEBUG) Log.d(TAG, "Read inline #" + i + ": " + mList.get(mList.size()-1));
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i++;
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}
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if (i >= N) {
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return;
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}
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final IBinder retriever = p.readStrongBinder();
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while (i < N) {
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if (DEBUG) Log.d(TAG, "Reading more @" + i + " of " + N + ": retriever=" + retriever);
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Parcel data = Parcel.obtain();
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Parcel reply = Parcel.obtain();
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data.writeInt(i);
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try {
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retriever.transact(IBinder.FIRST_CALL_TRANSACTION, data, reply, 0);
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} catch (RemoteException e) {
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Log.w(TAG, "Failure retrieving array; only received " + i + " of " + N, e);
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return;
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}
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while (i < N && reply.readInt() != 0) {
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final T parcelable = readCreator(creator, reply, loader);
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if (listElementClass == null) {
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listElementClass = parcelable.getClass();
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} else {
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verifySameType(listElementClass, parcelable.getClass());
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}
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mList.add(parcelable);
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if (DEBUG) Log.d(TAG, "Read extra #" + i + ": " + mList.get(mList.size()-1));
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i++;
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}
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reply.recycle();
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data.recycle();
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}
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}
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private T readCreator(Parcelable.Creator<?> creator, Parcel p, ClassLoader loader) {
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if (creator instanceof Parcelable.ClassLoaderCreator<?>) {
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Parcelable.ClassLoaderCreator<?> classLoaderCreator =
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(Parcelable.ClassLoaderCreator<?>) creator;
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return (T) classLoaderCreator.createFromParcel(p, loader);
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}
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return (T) creator.createFromParcel(p);
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}
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private static void verifySameType(final Class<?> expected, final Class<?> actual) {
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if (!actual.equals(expected)) {
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throw new IllegalArgumentException("Can't unparcel type "
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+ (actual == null ? null : actual.getName()) + " in list of type "
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+ (expected == null ? null : expected.getName()));
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}
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}
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public List<T> getList() {
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return mList;
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}
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/**
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* Set a limit on the maximum number of entries in the array that will be included
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* inline in the initial parcelling of this object.
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*/
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public void setInlineCountLimit(int maxCount) {
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mInlineCountLimit = maxCount;
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}
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/**
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* Write this to another Parcel. Note that this discards the internal Parcel
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* and should not be used anymore. This is so we can pass this to a Binder
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* where we won't have a chance to call recycle on this.
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*/
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@Override
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public void writeToParcel(Parcel dest, int flags) {
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final int N = mList.size();
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final int callFlags = flags;
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dest.writeInt(N);
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if (DEBUG) Log.d(TAG, "Writing " + N + " items");
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if (N > 0) {
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final Class<?> listElementClass = mList.get(0).getClass();
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writeParcelableCreator(mList.get(0), dest);
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int i = 0;
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while (i < N && i < mInlineCountLimit && dest.dataSize() < MAX_IPC_SIZE) {
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dest.writeInt(1);
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final T parcelable = mList.get(i);
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verifySameType(listElementClass, parcelable.getClass());
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writeElement(parcelable, dest, callFlags);
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if (DEBUG) Log.d(TAG, "Wrote inline #" + i + ": " + mList.get(i));
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i++;
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}
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if (i < N) {
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dest.writeInt(0);
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Binder retriever = new Binder() {
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@Override
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protected boolean onTransact(int code, Parcel data, Parcel reply, int flags)
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throws RemoteException {
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if (code != FIRST_CALL_TRANSACTION) {
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return super.onTransact(code, data, reply, flags);
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}
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int i = data.readInt();
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if (DEBUG) Log.d(TAG, "Writing more @" + i + " of " + N);
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while (i < N && reply.dataSize() < MAX_IPC_SIZE) {
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reply.writeInt(1);
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final T parcelable = mList.get(i);
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verifySameType(listElementClass, parcelable.getClass());
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writeElement(parcelable, reply, callFlags);
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if (DEBUG) Log.d(TAG, "Wrote extra #" + i + ": " + mList.get(i));
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i++;
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}
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if (i < N) {
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if (DEBUG) Log.d(TAG, "Breaking @" + i + " of " + N);
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reply.writeInt(0);
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}
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return true;
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}
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};
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if (DEBUG) Log.d(TAG, "Breaking @" + i + " of " + N + ": retriever=" + retriever);
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dest.writeStrongBinder(retriever);
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}
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}
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}
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abstract void writeElement(T parcelable, Parcel reply, int callFlags);
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abstract void writeParcelableCreator(T parcelable, Parcel dest);
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abstract Parcelable.Creator<?> readParcelableCreator(Parcel from, ClassLoader loader);
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}
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