存储 ArrayList<PendingIntent>进入共享首选项 [英] Store ArrayList&lt;PendingIntent&gt; into SharedPreferences

问题描述

我找不到问题的答案，所以我决定发布一个问题.问题很简单.

II couldn't find an answer for my problem so I decided to post a question. The question is simple.

如何将 ArrayList 存储到 SharedPreferences 中?最好的方法是什么，我必须使用某种 Serialization 吗?

How can I store an ArrayList<PendingIntent> into SharedPreferences? What is the best way, do i have to use some kind of Serialization?

预先感谢您，任何建议都会很棒！

Thank you in advance, any advice would be great!

推荐答案

PendingIntent 实现 Parcelable.您需要遍历 ArrayList 并将每个 PendingIntent 转换为 String.然后，您可以将所有单独的 String 连接成一个 String(每个之间有一些分隔符).然后将生成的 String 写入 SharedPreferences.

PendingIntent implements Parcelable. You'll need to loop through your ArrayList and convert each PendingIntent into a String. You can then concatenate all the individual Strings into a single String (with some delimiter in between each one). Then write the resulting String to SharedPreferences.

您可以像这样将 Parcelable 转换为 byte[]:

You can convert a Parcelable into a byte[] like this:

PendingIntent pendingIntent = // Your PendingIntent here
Parcel parcel = Parcel.obtain(); // Get a Parcel from the pool
pendingIntent.writeToParcel(parcel, 0);
byte[] bytes = parcel.marshall();
parcel.recycle(); // Return the Parcel to the pool

现在使用 base64 编码(或任何其他机制，例如将每个字节转换为 2 个十六进制数字)将 byte[] 转换为 String.要使用 base64，您可以这样做:

Now convert the byte[] to a String by using base64 encoding (or any other mechanism, like converting each byte into 2 hexadecimal digits). To use base64 you can do this:

String base64String = Base64.encodeToString(bytes, Base64.NO_WRAP | Base64.NO_PADDING);

见 如何在 Parcel 的帮助下将 Parcelable 编组和解组为字节数组? 有关如何将 Parcelable 转换为 byte[] 的更多信息和反之亦然.

See How to marshall and unmarshall a Parcelable to a byte array with help of Parcel? for more information about how to convert a Parcelable to byte[] and vice-versa.

这篇关于存储 ArrayList<PendingIntent>进入共享首选项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！