Android Bundle Class

Today I found that I didn't even know the bundle, so I took the time to study it.

According to Google's official documentation (HTTP://DEVELOPER.ANDROID.COM/REFERENCE/ANDROID/OS/BUNDLE.HTML)

The bundle class is a key-value pair, "a mapping from String values to various parcelable types."

Class inheritance Relationships:

Java.lang.Object
Android.os.Bundle

The bundle class is a final class:
Public final class
Bundle
Extends Objectimplements parcelable cloneable

Communication between the two activity can be achieved through the bundle class, which is:

(1) Create a new bundle class

(2) Add data to the bundle class (the form of key-value, there is a activity inside the data, it is necessary to use key, find the corresponding value)

Mbundle.putstring ("Data", "Data from Testbundle");

(3) Create a new intent object and add the bundle to this intent object

Intent Intent = new Intent ();  Intent.setclass (Testbundle.this, target.class);  Intent.putextras (Mbundle);

Complete code such as the following:

Android Mainfest.xml such as the following:

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "http://schemas.android.com/apk/res/ Android "      package=" com.tencent.test "      android:versioncode=" 1 "      android:versionname=" 1.0 ">    < Application android:icon= "@drawable/icon" android:label= "@string/app_name" >        <activity android:name= ". Testbundle "                  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= ". Target "></activity>    </application>    

Two classes such as the following: Intent from the Testbundle class, to the target class.

Class 1:testbundle class:

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 Testbundle extends Activity {  private Button button1;private Onclicklistener cl;     public void OnCreate (Bundle savedinstancestate) {      super.oncreate (savedinstancestate);      Setcontentview (r.layout.main);            Button1 = (Button) Findviewbyid (r.id.button1);    CL = new Onclicklistener () {    @Override public    void OnClick (View arg0) {//TODO auto-generated method Stubintent in Tent = new Intent ();  Intent.setclass (Testbundle.this, target.class);  Bundle Mbundle = new bundle ();  Mbundle.putstring ("Data", "Data from Testbundle"), or//press-in  Intent.putextras (mbundle);  StartActivity (intent);}        };        Button1.setonclicklistener (CL);}    }  

Class 2:target

Import android.app.Activity;  Import Android.os.Bundle;  public class Target extends activity{public      void OnCreate (Bundle savedinstancestate) {              super.oncreate ( Savedinstancestate);          Setcontentview (r.layout.target);          Bundle bundle = Getintent (). Getextras ();    Get the bundle        String data = bundle.getstring ("data");//read out data          settitle;      }  }  

Layout file:

Main.xml

<?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=" @string/hello "    /><button      android:layout_width=" Fill_parent "     android:layout_height= "Wrap_content"     android:text= "@string/button"    android:id = "@+id/button1"    / > </LinearLayout>

Target.xml

<?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=" @string/target "    /></linearlayout>

String.xml

<?xml version= "1.0" encoding= "Utf-8"?><resources> <string    name= "Hello" >hello world, testbundle!</string>    <string name= "app_name" > Test bundle Usage </string>    <string name= " Button "> Click Jump </string>    <string name=" target "> Come to target activity</string></resources >

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