Java 如何序列化对象的 ArrayList 并将其保存到文件（在 android 中）？
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How do I serialize an ArrayList of objects and save it to a file (in android)?
提问by abc32112
This is probably really simple, but after having read a number of guides, I can't figure out what's wrong with my code. The following is supposed to serialize and save a list of objects contained in an ArrayList. It works, exceptall instance variables contained in the objects in the ArrayList, are lost.
这可能真的很简单，但是在阅读了许多指南之后，我无法弄清楚我的代码有什么问题。下面应该序列化并保存包含在 ArrayList 中的对象列表。它可以工作，除了ArrayList 中的对象中包含的所有实例变量都丢失了。
Edit: can someone tell me if this part of the code is correct?
编辑：有人能告诉我这部分代码是否正确吗？
try {
FileOutputStream fos = this.openFileOutput ( FILENAME, Context.MODE_PRIVATE );
ObjectOutputStream oos = new ObjectOutputStream ( fos );
oos.writeObject ( arrayList );
oos.close ();
} catch ( Exception ex ) {
ex.printStackTrace ();
}
回答by Sipka
First you should check the Logcat output whether writing, or reading fails.
首先，您应该检查 Logcat 输出是否写入或读取失败。
You are using oos.writeObject(arrayList); Make sure that the items of arrayList are implementing the Serializable interface, else the writing will fail. For example:
您正在使用 oos.writeObject(arrayList); 确保 arrayList 的项正在实现 Serializable 接口，否则写入将失败。例如：
public class MyClass implements Serializable { }
...
ArrayList<MyClass> arrayList = new ArrayList<MyClass>();
/*add items*/
oos.writeObject(arrayList);//it will not throw Exception, because MyClass implements Serializable
and reading with (ArrayList<MyClass>) ois.readObject();but you know that.
和阅读，(ArrayList<MyClass>) ois.readObject();但你知道。
