Android through intent using bundle delivery object Details _android

Android uses bundle to pass objects through intent

In Android development, you sometimes need to pass objects between applications or between processes, and here's a detailed description of how intent uses bundle to pass objects.

The object being passed needs to be serialized first, and there are two ways to serialize the object:java.io.Serializable and Android.os.Parcelable

Serializable is used in Java, and Google uses a custom parcelable on Android.

The difference between the two serialization modes:

1. In the use of memory, parcelable than serializable performance, recommended the use of parcelable class;
2.Serializable produces a large number of temporary variables when serializing, resulting in frequent GC;
3.Parcelable cannot be used in situations where you want to store data on disk because Parcelable does not guarantee the continuity of the data in the event of a change in the environment,

This situation suggests the use of serializable.

The first step: Define the serialized entity class;

Serializable way:

/** 
 * Personser * * 
 @author http://blog.csdn.net/zuolongsnail/public 
class Personser Implements Serializable { 
 
 /** 
  * serialversionuid role is to modify the entity class, can be normal serialization and deserialization, in this not to say, we can Google Baidu under. 
  * 
 private static final long serialversionuid = -7620435178023928252l; 
 
 private String name; 
 
 private int age; 
 
 Public String GetName () {return 
  name; 
 } 
 
 public void SetName (String name) { 
  this.name = name; 
 } 
 
 public int getage () {return age 
  ; 
 } 
 
 public void Setage (int age) { 
  this.age = age; 
 } 
 
} 

Parcelable Way:

/** * Personpar * * @author http://blog.csdn.net/zuolongsnail/public class Personpar implements Parcelable { 
 
 private String name; 
 
 private int age; 
 Public String GetName () {return name; 
 public void SetName (String name) {this.name = name; 
 public int getage () {return age; 
 public void Setage (int age) {this.age = age; /** * Serialization Entity class * * public static final parcelable.creator<personpar> Creator = new CREATOR&LT;PERSONPAR&G 
   t; () {Public Personpar createfromparcel (Parcel source) {Personpar Personpar = new Personpar (); 
   Personpar.name = Source.readstring (); 
   Personpar.age = Source.readint (); 
  return personpar; 
  Personpar[] NewArray (int size) {return new personpar[size]; 
 
 } 
 }; 
 @Override public int describecontents () {return 0; /** * Writes entity class data to Parcel */@Override public void Writetoparcel (Parcel Parcel, int flags) {PARCEL.WRITESTR 
ing (name);  Parcel.writeint (age); 
 } 
 
}

Step Two: Pass the serialized object;

Intent Intent = new Intent (mainactivity.this, destactivity.class); 
Bundle Bundle = new Bundle (); 
Switch (V.getid ()) {case 
r.id.serializable_btn: 
 //Serializable Delivery object 
 personser Personser = new Personser () ; 
 Personser.setname ("Zuolong"); 
 Personser.setage (); 
 Bundle.putserializable (Ser_key, personser); 
 Intent.putextra ("type", Ser_type); 
 Intent.putextras (bundle); 
 StartActivity (intent); 
 break; 
Case R.ID.PARCELABLE_BTN: 
 //Parcelable Transfer object 
 personpar personpar = new Personpar (); 
 Personpar.setname ("snail"); 
 Personpar.setage (a); 
 Bundle has Putparcelablearray and Putparcelablearraylist methods, and can also pass arrays and lists 
 bundle.putparcelable (Par_key, personpar); 
 Intent.putextra ("type", Par_type); 
 Intent also has the Putparcelablearraylistextra method, which can pass the list of objects that implements the Parcelable interface 
 Intent.putextras (bundle); 
 StartActivity (intent); 
 break; 
 

The third step: Obtain the object;

StringBuffer sb = new StringBuffer (); 
String type = Getintent (). Getstringextra ("type"); 
According to type, what kind of 
if (Type.equals (Mainactivity.ser_type)) { 
 //Get serializable object 
 personser Personser = ( Personser) getintent (). Getserializableextra ( 
   mainactivity.ser_key); 
 Sb.append ("----from Serializable----"). Append ("\ n"); 
 Sb.append ("Name:"). Append (Personser.getname ()). Append ("\ n"); 
 Sb.append ("Age:"). Append (Personser.getage ()). Append ("\ n"); 
else if (type.equals (Mainactivity.par_type)) { 
 //Get Parcelable object 
 personpar personpar = (personpar) getintent (). Getparcelableextra ( 
   mainactivity.par_key); 
 Sb.append ("----from parcelable----"). Append ("\ n"); 
 Sb.append ("Name:"). Append (Personpar.getname ()). Append ("\ n"); 
 Sb.append ("Age:"). Append (Personpar.getage ()). Append ("\ n"); 
 

Attached Source: Download the Address

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