Pendingintent getbroadcast 丢失可打包数据 [英] Pendingintent getbroadcast lost parcelable data

问题描述

问题来了.我的程序在 Android 6.0 上运行完美.将设备更新到 android 7.0 后.Pendingintent 无法将可打包数据传递给广播接收器.这是代码.

Here is the problem. My program is running perfect in Android 6.0. After update the device to android 7.0. Pendingintent can not pass the parcelable data to boradcast reveiver. Here is the code.

触发警报

public static void setAlarm(@NonNull Context context, @NonNull Todo todo) {
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
    Intent intent = new Intent(context, AlarmReceiver.class);
    intent.putExtra("KEY_TODO", todo);
    PendingIntent alarmIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    alarmManager.set(AlarmManager.RTC_WAKEUP, todo.remindDate.getTime(), alarmIntent);
}

Todo 是一个 Parcelable 类，而 todo 是我在通知中需要的实例.

Todo is a Parcelable class while todo is the instance I need in notification.

在 Broadcastreceiver 中，我无法获取 Parcelable 数据.

In Broadcastreceiver, I cannot getParcelable data.

public void onReceive(Context context, Intent intent) {

    Todo todo = intent.getParcelableExtra("KEY_TODO");

}

这是我调试时意图的结果

Here is the result of intent when I debug

我不知道为什么意图只包含一个我从未放入的整数.Parcelable 待办事项在哪里.这段代码在android 6.0没有问题，但是在7.0不能运行

I dont know why the intent only contains a Integer that I never put it in. Where is the Parcelable todo. This code has no problem in android 6.0, but can not run in 7.0

推荐答案

引用 我自己:

自定义 Parcelable 类 —您的应用程序所独有的，而不是一部分Android 框架的介绍 —有过间歇性的问题用作 Intent 附加项的年份.基本上，如果一个核心操作系统进程需要修改 Intent 附加项，该过程最终会尝试重新创建您的 Parcelable 对象作为设置extras Bundle 用于修改.那个过程没有你类，因此它会收到运行时异常.

Custom Parcelable classes — ones unique to your app, not a part of the Android framework — have had intermittent problems over the years when used as Intent extras. Basically, if a core OS process needs to modify the Intent extras, that process winds up trying to recreate your Parcelable objects as part of setting up the extras Bundle for modification. That process does not have your class and so it gets a runtime exception.

可能发生这种情况的一个领域是 AlarmManager.使用的代码带有 AlarmManager 的自定义 Parcelable 对象可能有效在旧版 Android 上不适用于 Android N.

One area where this can occur is with AlarmManager. Code that used custom Parcelable objects with AlarmManager that might have worked on older versions of Android will not work on Android N.

我所知道的最有效的解决方法是自己手动将 Parceable 转换为 byte[] 并将其放入 Intent额外的，根据需要手动将其转换回 Parcelable.此堆栈溢出答案展示了该技术，这个示例项目 提供了一个完整的工作示例.

The most efficient workaround that I know of is to manually convert the Parceable yourself into a byte[] and put that in the Intent extra, manually converting it back into a Parcelable as needed. This Stack Overflow answer shows the technique, and this sample project provides a complete working sample.

关键位是 Parcelable 和 byte[] 之间的转换:

The key bits are the conversions between the Parcelable and the byte[]:

/***
 Copyright (c) 2016 CommonsWare, LLC
 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.

 From _The Busy Coder's Guide to Android Development_
 https://commonsware.com/Android
 */

package com.commonsware.android.parcelable.marshall;

import android.os.Parcel;
import android.os.Parcelable;

// inspired by https://stackoverflow.com/a/18000094/115145

public class Parcelables {
  public static byte[] toByteArray(Parcelable parcelable) {
    Parcel parcel=Parcel.obtain();

    parcelable.writeToParcel(parcel, 0);

    byte[] result=parcel.marshall();

    parcel.recycle();

    return(result);
  }

  public static <T> T toParcelable(byte[] bytes,
                                   Parcelable.Creator<T> creator) {
    Parcel parcel=Parcel.obtain();

    parcel.unmarshall(bytes, 0, bytes.length);
    parcel.setDataPosition(0);

    T result=creator.createFromParcel(parcel);

    parcel.recycle();

    return(result);
  }
}

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