Android Serialization序列化
阿新 • • 發佈:2018-12-19
Android Serialization
目的:
為了方便測試感測器資料處理演算法,Android程式的採集資料,序列化儲存為檔案;pc程式再通過反序列化讀入物件,在PC上測試演算法。
Java 序列化:
將Java物件序列化為二進位制檔案的Java序列化技術是Java系列技術中一個較為重要的技術點,在大部分情況下,開發人員只需要瞭解被序列化的類需要實現Serializable介面,使用ObjectInputStream和ObjectOutputStream進行物件的讀寫。
注意事項:
要序列化的物件的類要滿足以下條件:
1.類要實現Serializable 介面
2. serialize 和deserialize程式要保證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"/>
參考:
Java –Serialization
http://www.tutorialspoint.com/java/java_serialization.htm
Java 序列化的高階認識
http://www.ibm.com/developerworks/cn/java/j-lo-serial/index.html?ca=drs-#icomments
(序列化ID的問題,靜態變數序列化,父類的序列化與Transient關鍵字,對敏感欄位加密,序列化儲存規則)