Serializable and Parcelable)

 

In Android, how does one transmit objects in Intent? As far as I know, there are two methods: Bundle. putSerializable (Key, Object); Bundle. putParcelable (Key, Object); of course, these objects have certain conditions. The former implements the Serializable interface, and the latter implements the Parcelable interface, to make it easier for everyone to understand, I wrote a simple Demo as usual. Let's come with me step by step!

Step 1: Create an Android project named ObjectTranDemo (many classes !) The directory structure is as follows:

 

Step 2: Modify the main. xml layout file (here I have added two buttons). The Code is as follows:

To clipboardprint? <? Xml version = "1.0" encoding = "UTF-8"?>
<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"
Android: orientation = "vertical"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
>
<TextView
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: text = "Welcome to Mr wei's blog ."
/>
<Button
Android: id = "@ + id/button1"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: text = "Serializable"
/>
<Button
Android: id = "@ + id/button2"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: text = "Parcelable"
/>
</LinearLayout>

 

Step 3: create two classes: one is the Person. java Serializable interface, and the other Book. java implements the Parcelable interface. The Code is as follows:

Person. java:

 

To clipboardprint? Package com. tutor. objecttran;
Import java. io. Serializable;
Public class Person implements Serializable {
Private static final long serialVersionUID =-7060210544600464481L;
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;
}

}

 

Book. java:

 

To clipboardprint? Package com. tutor. objecttran;
Import android. OS. Parcel;
Import android. OS. Parcelable;
Public class Book implements Parcelable {
Private String bookName;
Private String author;
Private int publishTime;

Public String getBookName (){
Return bookName;
}
Public void setBookName (String bookName ){
This. bookName = bookName;
}
Public String getAuthor (){
Return author;
}
Public void setAuthor (String author ){
This. author = author;
}
Public int getPublishTime (){
Return publishTime;
}
Public void setPublishTime (int publishTime ){
This. publishTime = publishTime;
}

Public static final Parcelable. Creator <Book> CREATOR = new Creator <Book> (){
Public Book createFromParcel (Parcel source ){
Book mBook = new Book ();
MBook. bookName = source. readString ();
MBook. author = source. readString ();
MBook. publishTime = source. readInt ();
Return mBook;
}
Public Book [] newArray (int size ){
Return new Book [size];
}
};

Public int describeContents (){
Return 0;
}
Public void writeToParcel (Parcel parcel, int flags ){
Parcel. writeString (bookName );
Parcel. writeString (author );
Parcel. writeInt (publishTime );
}
}

 

Step 4: Modify ObjectTranDemo. java and create two new activities, ObjectTranDemo1.java and ObjectTranDemo2.java, to display the Person object data and Book object data respectively. The Code is as follows:

ObjectTranDemo. java:

 
To clipboardprint? Package com. tutor. objecttran;
Import android. app. Activity;
Import android. content. Intent;
Import android. OS. Bundle;
Import android. view. View;
Import android. view. View. OnClickListener;
Import android. widget. Button;
Public class ObjectTranDemo extends Activity implements OnClickListener {

Private Button sButton, pButton;
Public final static String SER_KEY = "com. tutor. objecttran. ser ";
Public final static String PAR_KEY = "com. tutor. objecttran. par ";
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. main );
SetupViews ();

}

// My consistent style
Public void setupViews (){
SButton = (Button) findViewById (R. id. button1 );
PButton = (Button) findViewById (R. id. button2 );
SButton. setOnClickListener (this );
PButton. setOnClickListener (this );
}
// Serializeable Method for passing objects
Public void SerializeMethod (){
Person mPerson = new Person ();
MPerson. setName ("frankie ");
MPerson. setAge (25 );
Intent mIntent = new Intent (this, ObjectTranDemo1.class );
Bundle mBundle = new Bundle ();
MBundle. putSerializable (SER_KEY, mPerson );
MIntent. putExtras (mBundle );

StartActivity (mIntent );
}
// Pacelable object transfer method
Public void PacelableMethod (){
Book mBook = new Book ();
MBook. setBookName ("Android Tutor ");
MBook. setAuthor ("Frankie ");
MBook. setPublishTime (2010 );
Intent mIntent = new Intent (this, ObjectTranDemo2.class );
Bundle mBundle = new Bundle ();
MBundle. putParcelable (PAR_KEY, mBook );
MIntent. putExtras (mBundle );

StartActivity (mIntent );
}
// Click the button to respond to the event
Public void onClick (View v ){
If (v = sButton ){
SerializeMethod ();
} Else {
PacelableMethod ();
}
}
}

 

ObjectTranDemo1.java:

 

To clipboardprint? Package com. tutor. objecttran;
Import android. app. Activity;
Import android. OS. Bundle;
Import android. widget. TextView;
Public class ObjectTranDemo1 extends Activity {
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );

TextView mTextView = new TextView (this );
Person mPerson = (Person) getIntent (). getSerializableExtra (ObjectTranDemo. SER_KEY );
MTextView. setText ("You name is:" + mPerson. getName () + "/n" +
"You age is:" + mPerson. getAge ());

SetContentView (mTextView );
}
}

 

ObjectTranDemo2.java:

 

To clipboardprint? Package com. tutor. objecttran;
Import android. app. Activity;
Import android. OS. Bundle;
Import android. widget. TextView;
Public class ObjectTranDemo2 extends Activity {

Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
TextView mTextView = new TextView (this );
Book mBook = (Book) getIntent (). getParcelableExtra (ObjectTranDemo. PAR_KEY );
MTextView. setText ("Book name is:" + mBook. getBookName () + "/n" +
"Author is:" + mBook. getAuthor () + "/n" +
"PublishTime is:" + mBook. getPublishTime ());
SetContentView (mTextView );
}
}

 

Step 5: Next, modify the AndroidManifest. xml file (declare the code of the two newly added activities, ObjectTranDemo1 and ObjectTranDemo2) as follows (lines 14th and 15 ):

 

To clipboardprint? <? Xml version = "1.0" encoding = "UTF-8"?>
<Manifest xmlns: android = "http://schemas.android.com/apk/res/android"
Package = "com. tutor. objecttran"
Android: versionCode = "1"
Android: versionName = "1.0" type = "codeph" text = "/codeph">
<Application android: icon = "@ drawable/icon" android: label = "@ string/app_name">
<Activity android: name = ". ObjectTranDemo"
Android: label = "@ string/app_name">
<Intent-filter>
<Action android: name = "android. intent. action. MAIN"/>
<Category android: name = "android. intent. category. LAUNCHER"/>
</Intent-filter>
</Activity>
<Activity android: name = ". ObjectTranDemo1"> </activity>
<Activity android: name = ". ObjectTranDemo2"> </activity>
</Application>
<Uses-sdk android: minSdkVersion = "7"/>
</Manifest>

 

Step 6: run the above project to view it:

Effect 1: First interface:

 

Result 2: Click Serializable.

 

Effect 3: Click Parcelable: