blocks|key|3226724|text|保存(无异常处理代码)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3226725|FileOutputStream+fos+=+context.openFileOutput(fileName,+Context.MODE_PRIVATE);
ObjectOutputStream+os+=+new+ObjectOutputStream(fos);
os.writeObject(this);
os.close();
fos.close();|code-block|syntax|javascript|3226726|正在加载(无异常处理代码)：|3226727|FileInputStream+fis+=+context.openFileInput(fileName);
ObjectInputStream+is+=+new+ObjectInputStream(fis);
SimpleClass+simpleClass+=+(SimpleClass)+is.readObject();
is.close();
fis.close();|3226728|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Saving (w/o exception handling code):

<pre><code>FileOutputStream fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(this);
os.close();
fos.close();
</code></pre>

Loading (w/o exception handling code): 

<pre><code>FileInputStream fis = context.openFileInput(fileName);
ObjectInputStream is = new ObjectInputStream(fis);
SimpleClass simpleClass = (SimpleClass) is.readObject();
is.close();
fis.close();
</code></pre>

blocks|key|289866|text|我已经尝试了这两个选项(读/写)，使用普通对象，对象数组(150个对象)，Map：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|289867|Option1:|offset|length|style|BOLD|289868|FileOutputStream+fos+=+context.openFileOutput(fileName,+Context.MODE_PRIVATE);
ObjectOutputStream+os+=+new+ObjectOutputStream(fos);
os.writeObject(this);
os.close();|code-block|syntax|javascript|289869|Option2:|289870|SharedPreferences+mPrefs=app.getSharedPreferences(app.getApplicationInfo().name,+Context.MODE_PRIVATE);
SharedPreferences.Editor+ed=mPrefs.edit();
Gson+gson+=+new+Gson();+
ed.putString("myObjectKey",+gson.toJson(objectToSave));
ed.commit();|289871|选项2的速度是选项1的两倍|289872|选项2的不便之处在于，您必须编写特定的代码来读取：|289873|Gson+gson+=+new+Gson();
JsonParser+parser=new+JsonParser();
//object+arr+example
JsonArray+arr=parser.parse(mPrefs.getString("myArrKey",+null)).getAsJsonArray();
events=new+Event[arr.size()];
int+i=0;
for+(JsonElement+jsonElement+:+arr)
++++events[i%2B%2B]=gson.fromJson(jsonElement,+Event.class);
//Object+example
pagination=gson.fromJson(parser.parse(jsonPagination).getAsJsonObject(),+Pagination.class);|289874|entityMap^0|0|0|8|0|0|0|8|0|0|0|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|V|5|J|7|1B|8|@]|9|@]|A|$K|L]]|$1|W|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|X|$]]

I've tried this 2 options (read/write), with plain objects, array of objects (150 objects), Map:

Option1:

<pre><code>FileOutputStream fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(this);
os.close();
</code></pre>

Option2:

<pre><code>SharedPreferences mPrefs=app.getSharedPreferences(app.getApplicationInfo().name, Context.MODE_PRIVATE);
SharedPreferences.Editor ed=mPrefs.edit();
Gson gson = new Gson(); 
ed.putString("myObjectKey", gson.toJson(objectToSave));
ed.commit();
</code></pre>

Option 2 is twice quicker than option 1

The option 2 inconvenience is that you have to make specific code for read:

<pre><code>Gson gson = new Gson();
JsonParser parser=new JsonParser();
//object arr example
JsonArray arr=parser.parse(mPrefs.getString("myArrKey", null)).getAsJsonArray();
events=new Event[arr.size()];
int i=0;
for (JsonElement jsonElement : arr)
 events[i++]=gson.fromJson(jsonElement, Event.class);
//Object example
pagination=gson.fromJson(parser.parse(jsonPagination).getAsJsonObject(), Pagination.class);
</code></pre>

blocks|key|3226838|text|使用错误处理完成代码，并添加文件流关闭。将它添加到您希望能够序列化和反序列化的类中。在我的例子中，类名是CreateResumeForm。您应该将其更改为您自己的类名。Android接口Serializable不足以将对象保存到文件中，它只创建流。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3226839|//+Constant+with+a+file+name
public+static+String+fileName+=+"createResumeForm.ser";

//+Serializes+an+object+and+saves+it+to+a+file
public+void+saveToFile(Context+context)+{
++++try+{
++++++++FileOutputStream+fileOutputStream+=+context.openFileOutput(fileName,+Context.MODE_PRIVATE);
++++++++ObjectOutputStream+objectOutputStream+=+new+ObjectOutputStream(fileOutputStream);
++++++++objectOutputStream.writeObject(this);
++++++++objectOutputStream.close();
++++++++fileOutputStream.close();
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
}


//+Creates+an+object+by+reading+it+from+a+file
public+static+CreateResumeForm+readFromFile(Context+context)+{
++++CreateResumeForm+createResumeForm+=+null;
++++try+{
++++++++FileInputStream+fileInputStream+=+context.openFileInput(fileName);
++++++++ObjectInputStream+objectInputStream+=+new+ObjectInputStream(fileInputStream);
++++++++createResumeForm+=+(CreateResumeForm)+objectInputStream.readObject();
++++++++objectInputStream.close();
++++++++fileInputStream.close();
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
++++catch+(ClassNotFoundException+e)+{
++++++++e.printStackTrace();
++++}
++++return+createResumeForm;
}|code-block|syntax|javascript|3226840|在你的Activity中这样使用它：|3226841|form+=+CreateResumeForm.readFromFile(this);|3226842|entityMap^0|1G|G|2C|7|2L|C|0|0|3|8|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

Complete code with error handling and added file stream closes. Add it to your class that you want to be able to serialize and deserialize. In my case the class name is <code>CreateResumeForm</code>. You should change it to your own class name. <code>Android</code> interface <code>Serializable</code> is not sufficient to save your objects to the file, it only creates streams. 

<pre><code>// Constant with a file name
public static String fileName = "createResumeForm.ser";

// Serializes an object and saves it to a file
public void saveToFile(Context context) {
 try {
 FileOutputStream fileOutputStream = context.openFileOutput(fileName, Context.MODE_PRIVATE);
 ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
 objectOutputStream.writeObject(this);
 objectOutputStream.close();
 fileOutputStream.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
}


// Creates an object by reading it from a file
public static CreateResumeForm readFromFile(Context context) {
 CreateResumeForm createResumeForm = null;
 try {
 FileInputStream fileInputStream = context.openFileInput(fileName);
 ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
 createResumeForm = (CreateResumeForm) objectInputStream.readObject();
 objectInputStream.close();
 fileInputStream.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 catch (ClassNotFoundException e) {
 e.printStackTrace();
 }
 return createResumeForm;
}
</code></pre>

Use it like this in your <code>Activity</code>: 

<pre><code>form = CreateResumeForm.readFromFile(this);
</code></pre>

blocks|key|3012736|text|我刚刚创建了一个用泛型来处理这个问题的类，所以它可以与所有可序列化的对象类型一起使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3012737|public+class+SerializableManager+{

++++/**
+++++*+Saves+a+serializable+object.
+++++*
+++++*+@param+context+The+application+context.
+++++*+@param+objectToSave+The+object+to+save.
+++++*+@param+fileName+The+name+of+the+file.
+++++*+@param+<T>+The+type+of+the+object.
+++++*/

++++public+static+<T+extends+Serializable>+void+saveSerializable(Context+context,+T+objectToSave,+String+fileName)+{
++++++++try+{
++++++++++++FileOutputStream+fileOutputStream+=+context.openFileOutput(fileName,+Context.MODE_PRIVATE);
++++++++++++ObjectOutputStream+objectOutputStream+=+new+ObjectOutputStream(fileOutputStream);

++++++++++++objectOutputStream.writeObject(objectToSave);

++++++++++++objectOutputStream.close();
++++++++++++fileOutputStream.close();
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}

++++/**
+++++*+Loads+a+serializable+object.
+++++*
+++++*+@param+context+The+application+context.
+++++*+@param+fileName+The+filename.
+++++*+@param+<T>+The+object+type.
+++++*
+++++*+@return+the+serializable+object.
+++++*/

++++public+static<T+extends+Serializable>+T+readSerializable(Context+context,+String+fileName)+{
++++++++T+objectToReturn+=+null;

++++++++try+{
++++++++++++FileInputStream+fileInputStream+=+context.openFileInput(fileName);
++++++++++++ObjectInputStream+objectInputStream+=+new+ObjectInputStream(fileInputStream);
++++++++++++objectToReturn+=+(T)+objectInputStream.readObject();

++++++++++++objectInputStream.close();
++++++++++++fileInputStream.close();
++++++++}+catch+(IOException+%7C+ClassNotFoundException+e)+{
++++++++++++e.printStackTrace();
++++++++}

++++++++return+objectToReturn;
++++}

++++/**
+++++*+Removes+a+specified+file.
+++++*
+++++*+@param+context+The+application+context.
+++++*+@param+filename+The+name+of+the+file.
+++++*/

++++public+static+void+removeSerializable(Context+context,+String+filename)+{
++++++++context.deleteFile(filename);
++++}

}|code-block|syntax|javascript|3012738|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I just made a class to handle this with Generics, so it can be used with all the object types that are serializable:

<pre><code>public class SerializableManager {

 /**
 * Saves a serializable object.
 *
 * @param context The application context.
 * @param objectToSave The object to save.
 * @param fileName The name of the file.
 * @param &lt;T&gt; The type of the object.
 */

 public static &lt;T extends Serializable&gt; void saveSerializable(Context context, T objectToSave, String fileName) {
 try {
 FileOutputStream fileOutputStream = context.openFileOutput(fileName, Context.MODE_PRIVATE);
 ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);

 objectOutputStream.writeObject(objectToSave);

 objectOutputStream.close();
 fileOutputStream.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }

 /**
 * Loads a serializable object.
 *
 * @param context The application context.
 * @param fileName The filename.
 * @param &lt;T&gt; The object type.
 *
 * @return the serializable object.
 */

 public static&lt;T extends Serializable&gt; T readSerializable(Context context, String fileName) {
 T objectToReturn = null;

 try {
 FileInputStream fileInputStream = context.openFileInput(fileName);
 ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
 objectToReturn = (T) objectInputStream.readObject();

 objectInputStream.close();
 fileInputStream.close();
 } catch (IOException | ClassNotFoundException e) {
 e.printStackTrace();
 }

 return objectToReturn;
 }

 /**
 * Removes a specified file.
 *
 * @param context The application context.
 * @param filename The name of the file.
 */

 public static void removeSerializable(Context context, String filename) {
 context.deleteFile(filename);
 }

}
</code></pre>

blocks|key|292744|text|我使用SharePrefrences：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292745|package+myapps.serializedemo;

import+android.content.Context;
import+android.content.SharedPreferences;
import+android.support.v7.app.AppCompatActivity;
import+android.os.Bundle;
import+android.util.Log;

import+java.io.IOException;
import+java.util.ArrayList;

public+class+MainActivity+extends+AppCompatActivity+{
@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.activity_main);

//Create+the+SharedPreferences
++++SharedPreferences+sharedPreferences+=+this.getSharedPreferences("myapps.serilizerdemo",+Context.MODE_PRIVATE);
++++ArrayList<String>+friends+=+new+ArrayList<>();
++++friends.add("Jack");
++++friends.add("Joe");
++++try+{

+//Write+/+Serialize
+sharedPreferences.edit().putString("friends",
++++ObjectSerializer.serialize(friends)).apply();
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
//READ+BACK
++++ArrayList<String>+newFriends+=+new+ArrayList<>();
++++try+{
++++++++newFriends+=+(ArrayList<String>)+ObjectSerializer.deserialize(
++++++++++++++++sharedPreferences.getString("friends",+ObjectSerializer.serialize(new+ArrayList<String>())));
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
++++Log.i("***NewFriends",+newFriends.toString());
}
}|code-block|syntax|javascript|292746|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I use SharePrefrences:

<pre><code>package myapps.serializedemo;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

//Create the SharedPreferences
 SharedPreferences sharedPreferences = this.getSharedPreferences("myapps.serilizerdemo", Context.MODE_PRIVATE);
 ArrayList&lt;String&gt; friends = new ArrayList&lt;&gt;();
 friends.add("Jack");
 friends.add("Joe");
 try {

 //Write / Serialize
 sharedPreferences.edit().putString("friends",
 ObjectSerializer.serialize(friends)).apply();
 } catch (IOException e) {
 e.printStackTrace();
 }
//READ BACK
 ArrayList&lt;String&gt; newFriends = new ArrayList&lt;&gt;();
 try {
 newFriends = (ArrayList&lt;String&gt;) ObjectSerializer.deserialize(
 sharedPreferences.getString("friends", ObjectSerializer.serialize(new ArrayList&lt;String&gt;())));
 } catch (IOException e) {
 e.printStackTrace();
 }
 Log.i("***NewFriends", newFriends.toString());
}
}
</code></pre>

blocks|key|294917|text|您必须将ObjectSerialization类添加到程序中，以下方法可能会起作用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|294918|++++import+java.io.ByteArrayInputStream;
++++import+java.io.ByteArrayOutputStream;
++++import+java.io.IOException;
++++import+java.io.ObjectInputStream;
++++import+java.io.ObjectOutputStream;
++++import+java.io.Serializable;

++++public+class+ObjectSerializer+{

public+static+String+serialize(Serializable+obj)+throws+IOException+{
++++if+(obj+==+null)+return+"";
++++try+{
++++++++ByteArrayOutputStream+serialObj+=+new+ByteArrayOutputStream();
++++++++ObjectOutputStream+objStream+=+new+ObjectOutputStream(serialObj);
++++++++objStream.writeObject(obj);
++++++++objStream.close();
++++++++return+encodeBytes(serialObj.toByteArray());
++++}+catch+(Exception+e)+{
++++++++throw+new+RuntimeException(e);
++++}
}

public+static+Object+deserialize(String+str)+throws+IOException+{
++++if+(str+==+null+%7C%7C+str.length()+==+0)+return+null;
++++try+{
++++++++ByteArrayInputStream+serialObj+=+new+ByteArrayInputStream(decodeBytes(str));
++++++++ObjectInputStream+objStream+=+new+ObjectInputStream(serialObj);
++++++++return+objStream.readObject();
++++}+catch+(Exception+e)+{
++++++++throw+new+RuntimeException(e);
++++}
}

public+static+String+encodeBytes(byte[]+bytes)+{
++++StringBuffer+strBuf+=+new+StringBuffer();

++++for+(int+i+=+0;+i+<+bytes.length;+i%2B%2B)+{
++++++++strBuf.append((char)+(((bytes[i]+>>+4)+&+0xF)+%2B+((int)+'a')));
++++++++strBuf.append((char)+(((bytes[i])+&+0xF)+%2B+((int)+'a')));
++++}

++++return+strBuf.toString();
}

public+static+byte[]+decodeBytes(String+str)+{
++++byte[]+bytes+=+new+byte[str.length()+/+2];
++++for+(int+i+=+0;+i+<+str.length();+i%2B=2)+{
++++++++char+c+=+str.charAt(i);
++++++++bytes[i/2]+=+(byte)+((c+-+'a')+<<+4);
++++++++c+=+str.charAt(i%2B1);
++++++++bytes[i/2]+%2B=+(c+-+'a');
++++}
++++return+bytes;
}|code-block|syntax|javascript|294919|}|294920|如果你用来存储一个带有SharedPreferences的数组，那么使用以下命令：-|294921|SharedPreferences+sharedPreferences+=+this.getSharedPreferences(getPackageName(),MODE_PRIVATE);|294922|序列化：-|294923|sharedPreferences.putString("name",ObjectSerializer.serialize(array));|294924|反序列化：-|294925|newarray+=+(CAST_IT_TO_PROPER_TYPE)+ObjectSerializer.deSerialize(sharedPreferences.getString(name),null);|294926|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

You must add an ObjectSerialization class to your program the following may work

<pre><code> import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.Serializable;

 public class ObjectSerializer {

public static String serialize(Serializable obj) throws IOException {
 if (obj == null) return "";
 try {
 ByteArrayOutputStream serialObj = new ByteArrayOutputStream();
 ObjectOutputStream objStream = new ObjectOutputStream(serialObj);
 objStream.writeObject(obj);
 objStream.close();
 return encodeBytes(serialObj.toByteArray());
 } catch (Exception e) {
 throw new RuntimeException(e);
 }
}

public static Object deserialize(String str) throws IOException {
 if (str == null || str.length() == 0) return null;
 try {
 ByteArrayInputStream serialObj = new ByteArrayInputStream(decodeBytes(str));
 ObjectInputStream objStream = new ObjectInputStream(serialObj);
 return objStream.readObject();
 } catch (Exception e) {
 throw new RuntimeException(e);
 }
}

public static String encodeBytes(byte[] bytes) {
 StringBuffer strBuf = new StringBuffer();

 for (int i = 0; i &lt; bytes.length; i++) {
 strBuf.append((char) (((bytes[i] &gt;&gt; 4) &amp; 0xF) + ((int) 'a')));
 strBuf.append((char) (((bytes[i]) &amp; 0xF) + ((int) 'a')));
 }

 return strBuf.toString();
}

public static byte[] decodeBytes(String str) {
 byte[] bytes = new byte[str.length() / 2];
 for (int i = 0; i &lt; str.length(); i+=2) {
 char c = str.charAt(i);
 bytes[i/2] = (byte) ((c - 'a') &lt;&lt; 4);
 c = str.charAt(i+1);
 bytes[i/2] += (c - 'a');
 }
 return bytes;
}
</code></pre>

}

if you are using to store an array with SharedPreferences than use following:-

<pre><code>SharedPreferences sharedPreferences = this.getSharedPreferences(getPackageName(),MODE_PRIVATE);
</code></pre>

To Serialize:-

<pre><code>sharedPreferences.putString("name",ObjectSerializer.serialize(array));
</code></pre>

To Deserialize:-

<pre><code>newarray = (CAST_IT_TO_PROPER_TYPE) ObjectSerializer.deSerialize(sharedPreferences.getString(name),null);
</code></pre>

Say I have some simple class and once it's instantiated as an object I want to be able to serialize its contents to a file, and retrieve it by loading that file at some later time... I'm not sure where to start here, what do I need to do to serialize this object to a file?

<pre><code>public class SimpleClass {
 public string name;
 public int id;
 public void save() {
 /* wtf do I do here? */
 }
 public static SimpleClass load(String file) {
 /* what about here? */
 }
}
</code></pre>

This is probably the easiest question in the world, because this is a really simple task in .NET, but in Android I'm pretty new so I'm completely lost.

How do I serialize an object and save it to a file in Android?

Android

假设我有一些简单的类，一旦它被实例化为对象，我希望能够将其内容序列化为文件，并在以后通过加载该文件来检索它……我不知道从哪里开始，我需要做什么才能将这个对象序列化为文件？public class SimpleClass {   public string name;   public int id;   public ...

问如何在Android中序列化对象并将其保存为文件？
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