Android Bundle Class

Source: http://blog.csdn.net/randyjiawenjie/article/details/6651437

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

[Java]View Plaincopy

1. Bundle Mbundle = new Bundle ();

(2) The bundle class to add data (key-value form, the other activity inside the data, it is necessary to use key, to find the corresponding value)

[Java]View Plaincopy

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

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

[CPP]View Plaincopy

1. Intent Intent = new Intent ();
2. Intent.setclass (Testbundle. This, Target.    class);
3. Intent.putextras (Mbundle);

The complete code is as follows:

Android Mainfest.xml are as follows:

[Java]View Plaincopy

2. <?xml version="1.0" encoding="Utf-8"?>
4. <manifest xmlns:android="Http://schemas.android.com/apk/res/android"
6. package="Com.tencent.test"
8. android:versioncode="1"
10. Android:versionname="1.0" >
12. <application android:icon="@drawable/icon" android:label="@string/app_name" >
14. <activity android:name=". Testbundle "
16. Android:label="@string/app_name" >
18. <intent-filter>
20. <action android:name="Android.intent.action.MAIN"/>
22. <category android:name="Android.intent.category.LAUNCHER"/>
24. </intent-filter>
26. </activity>
28. <activity android:name=". Target "></activity>
30. </application>
32. <USES-SDK android:minsdkversion="7"/>
34. </manifest>

The two classes are as follows: Intent from the Testbundle class to the target class.

Class 1:testbundle class:

[Java]View Plaincopy

2. Import android.app.Activity;
4. Import android.content.Intent;
6. Import Android.os.Bundle;
8. Import Android.view.View;
10. Import Android.view.View.OnClickListener;
12. Import Android.widget.Button;
16. Public class Testbundle extends Activity {
20. private Button button1;
22. private Onclicklistener cl;
24. public void OnCreate (Bundle savedinstancestate) {
26. super.oncreate (savedinstancestate);
28. Setcontentview (R.layout.main);
32. Button1 = (Button) Findviewbyid (R.id.button1);
34. CL = New Onclicklistener () {
36. @Override
38. public void OnClick (View arg0) {
40. //TODO auto-generated method stub
42. Intent Intent = new Intent ();
44. Intent.setclass (Testbundle. This, Target.    class);
46. Bundle Mbundle = new Bundle ();
48. Mbundle.putstring ("Data", "data from Testbundle"); Press-in data
50. Intent.putextras (Mbundle);
52. StartActivity (Intent);
54. }
56. };
58. Button1.setonclicklistener (CL);
60. }
62. }

Class 2:target

[Java]View Plaincopy

2. Import android.app.Activity;
4. Import Android.os.Bundle;
8. Public class Target extends activity{
12. public void OnCreate (Bundle savedinstancestate) {
16. super.oncreate (savedinstancestate);
18. Setcontentview (R.layout.target);
20. <span style="color: #ff6600;"   >bundle Bundle = Getintent (). Getextras (); </span> //Get bundles sent
22. String data = bundle.getstring ("data"); Read the data
24. Settitle (data);
28. }
30. }

Layout file:

Main.xml

[Java]View Plaincopy

2. <?xml version="1.0" encoding="Utf-8"?>
4. <linearlayout xmlns:android="Http://schemas.android.com/apk/res/android"
6. android:orientation="Vertical"
8. Android:layout_width="Fill_parent"
10. android:layout_height="Fill_parent"
12. >
14. <textview
16. Android:layout_width="Fill_parent"
18. android:layout_height="Wrap_content"
20. android:text="@string/hello"
22. />
24. <button
26. Android:layout_width="Fill_parent"
28. android:layout_height="Wrap_content"
30. android:text="@string/button"
32. Android:id = "@+id/button1"
34. />
36. </LinearLayout>

Target.xml

[Java]View Plaincopy

2. <?xml version="1.0" encoding="Utf-8"?>
4. <linearlayout xmlns:android="Http://schemas.android.com/apk/res/android"
6. android:orientation="Vertical"
8. Android:layout_width="Fill_parent"
10. android:layout_height="Fill_parent"
12. >
14. <textview
16. Android:layout_width="Fill_parent"
18. android:layout_height="Wrap_content"
20. android:text="@string/target"
22. />
24. </LinearLayout>

String.xml

[Java]View Plaincopy

1. <?xml version="1.0" encoding="Utf-8"?>
2. <resources>
3. <string name="Hello" >hello world, testbundle!</string>
4. <string name="app_name" > Test bundle Usage </string>
5. <string name="button" > click to jump </string>
6. <string name="target" > came to target activity</string>
7. </resources>

Results:

Jump results:

Android Bundle Class