Android Serialization
目的:
为了方便测试传感器数据处理算法,Android程序的采集数据,序列化保存为文件;pc程序再通过反序列化读入对象,在PC上测试算法。
Java 序列化:
将Java对象序列化为二进制文件的Java序列化技术是Java系列技术中一个较为重要的技术点,在大部分情况下,开发人员只需要了解被序列化的类需要实现Serializable接口,使用ObjectInputStream和ObjectOutputStream进行对象的读写。
注意事项:
要序列化的对象的类要满足以下条件:
1.类要实现Serializable接口
2. serialize 和deserialize程序要保证package一致
3.serialVersionUID要一致
例程:
package com.example.coolwaterld.serializedemo;
import java.io.Serializable;
class Person implements Serializable //Added implements Serializable
{
String name="";
private String number="";
private String address="";
private static final long serialVersionUID = 1L;
public String getName()
{
return name;
}
public String getNumber()
{
return number;
}
public String getAddress()
{
return address;
}
}
package com.example.coolwaterld.serializedemo;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Person person = new Person();
person.setName("coolwaterld");
person.setAddress("BJ");
person.setNumber("123");
//save the object
saveObject(person);
// Get the Object
Person person1 = (Person)loadSerializedObject(new File("/sdcard/person.bin"));
Log.i("Name", person1.getName());
}
public void saveObject(Person p){
try
{
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("/sdcard/kvmatrix.bin")));
oos.writeObject(p);
oos.flush();
oos.close();
}
catch(Exception ex)
{
Log.v("Serialize write: ", ex.getMessage());
ex.printStackTrace();
}
}
public Object loadSerializedObject(File f)
{
try
{
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(f));
Object o = ois.readObject();
return o;
}
catch(Exception ex)
{
Log.v("Serialize Read: ",ex.getMessage());
ex.printStackTrace();
}
return null;
}
}
在AndroidManifest.xml中
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
参考:
Java –Serialization
http://www.tutorialspoint.com/java/java_serialization.htm
Java 序列化的高级认识
http://www.ibm.com/developerworks/cn/java/j-lo-serial/index.html?ca=drs-#icomments
(序列化ID的问题,静态变量序列化,父类的序列化与Transient关键字,对敏感字段加密,序列化存储规则)