Android Program Development: (2) use intent -- 2.7 use intent-Filter

We already know that an activity calls another activity by using an intent object. To allow other activities to respond, you also need to configure the <intent-filter> element in androidmanifest. xml and specify action and category. For example:

[Java]View plaincopy

1. <Intent-filter>
2. <Action Android: Name = "com. Manoel. secondactivity"/>
3. <Category Android: Name = "android. Intent. Category. Default"/>
4. </Intent-filter>

1. Create a project and create a class: mybrowseractivity. java. Create an XML file brwoser. XML in RES/layout.

2. androidmanifest. xml

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1. <? XML version = "1.0" encoding = "UTF-8"?>
2. <Manifest xmlns: Android = "http://schemas.android.com/apk/res/android"
3. Package = "com. Manoel. intents"
4. Android: versioncode = "1"
5. Android: versionname = "1.0" type = "codeph" text = "/codeph">
7. <Uses-SDK Android: minsdkversion = "14"/>
8. <Uses-Permission Android: Name = "android. Permission. call_phone"/>
9. <Uses-Permission Android: Name = "android. Permission. Internet"/>
10. <Application
11. Android: icon = "@ drawable/ic_launcher"
12. Android: Label = "@ string/app_name">
13. <Activity
14. Android: Label = "@ string/app_name"
15. Android: Name = ". intentsactivity">
16. <Intent-filter>
17. <Action Android: Name = "android. Intent. Action. Main"/>
18. <Category Android: Name = "android. Intent. Category. launcher"/>
19. </Intent-filter>
20. </Activity>
23. <Activity Android: Name = ". mybrowseractivity"
24. Android: Label = "@ string/app_name">
25. <Intent-filter>
26. <Action Android: Name = "android. Intent. Action. View"/>
27. <Action Android: Name = "com. Manoel. mybrowser"/>
28. <Category Android: Name = "android. Intent. Category. Default"/>
29. <Data Android: Scheme = "HTTP"/>
30. </Intent-filter>
31. </Activity>
34. </Application>
36. </Manifest>

3. Add a button element to main. xml.[Java]View plaincopy

1. <? XML version = "1.0" encoding = "UTF-8"?>
2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
3. Android: layout_width = "fill_parent"
4. Android: layout_height = "fill_parent"
5. Android: Orientation = "vertical">
7. <Button
8. Android: Id = "@ + ID/btn_launchmybrowser"
9. Android: layout_width = "fill_parent"
10. Android: layout_height = "wrap_content"
11. Android: onclick = "onclicklaunchmybrowser"
12. Android: text = "launch my browser"/>
14. </Linearlayout>

4. intentsactivity. Java[Java]View plaincopy

1. Public class intentsactivity extends activity {
3. /** Called when the activity is first created .*/
4. @ Override
5. Public void oncreate (bundle savedinstancestate ){
6. Super. oncreate (savedinstancestate );
7. Setcontentview (R. layout. Main );
8. }
10. Public void onclicklaunchmybrowser (view ){
11. Intent I = new intent ("com. Manoel. mybrowser ");
12. I. setdata (URI. parse ("http://www.amazon.com "));
13. Startactivity (I );
14. }
16. }

5. browser. xml[Java]View plaincopy

1. <? XML version = "1.0" encoding = "UTF-8"?>
2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
3. Android: layout_width = "fill_parent"
4. Android: layout_height = "fill_parent"
5. Android: Orientation = "vertical">
7. <Webview
8. Android: Id = "@ + ID/webview01"
9. Android: layout_width = "wrap_content"
10. Android: layout_height = "wrap_content"/>
12. </Linearlayout>

6. myborwseractivity. Java[Java]View plaincopy

1. Public class mybrowseractivity extends activity {
2. /** Called when the activity is first created .*/
3. @ Override
4. Public void oncreate (bundle savedinstancestate ){
5. Super. oncreate (savedinstancestate );
6. Setcontentview (R. layout. browser );
8. Uri url = getintent (). getdata ();
9. Webview = (webview) findviewbyid (R. Id. webview01 );
10. Webview. setwebviewclient (New callback ());
11. Webview. loadurl (URL. tostring ());
12. }
14. Private class callback extends webviewclient {
15. @ Override
16. Public Boolean shouldoverrideurlloading (webview view, string URL ){
17. Return (false );
18. }
19. }
20. }

7. debugging.

8. Click the "launch my browser" button to view a new activity and display the webpage of the Amazon.com website.