Usage of configchanges attribute in activity

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By setting this property, the activity captures the state of the device, and the following is what can be identified:??



Config_font_scale

Config_mcc

Config_mnc

Config_locale

Config_touchscreen

Config_keyboard

Config_navigation

Config_orientation



Set method: Use the following fields with the "|" Symbols separated, for example: "Locale|navigation|orientation"

Value	:	Description
Mcc	:	The IMSI Mobile Country Code (MCC) has Changed-that are, a SIM hasbeen detected and updated the MCC. Mobile country number, consisting of three digits, each country has Their own independent MCC, can identify the mobile phone users of the country.
on!	:	The IMSI Mobile Network Code (MNC) has Changed-that is, a SIM hasbeen detected and updated the MNC. Mobile network number, in a country or region, used for district breakup Service Provider for machine users
Locale	:	The locale has changed-for example, the user have selected a new language that text should is displayed in. The user's area is changed.
Touchscreen	:	The touchscreen has changed. (This should never normally happen.)
Keyboard	:	The keyboard type has changed-for example, the user have plugged in an external keyboard. The keyboard mode changes, for example: User access to external keyboard input.
Keyboardhidden	:	The keyboard accessibility has changed-for example, the user have slid the keyboard out to expose it. User opens the phone hardware keyboard
Navigation	:	The navigation type has changed. (This should never normally happen.)
Orientation	:	The screen orientation have changed-that is and the user has rotated the device. Equipment rotation, landscape display and vertical display mode switching.
Fontscale	:	The font scaling factor has changed-that are, the user has selected a new global font size. Global Font Size scaling changes

The use of this property is explained by an example: first you need to modify the manifest of the project:

1. <manifest xmlns:android= "Http://schemas.android.com/apk/res/android"
2. ? ?? ? package= "Com.androidres.ConfigChangedTesting"
3. ? ?? ? android:versioncode= "1"
4. ? ?? ? android:versionname= "1.0.0" >
5. ? ? <application android:icon= "@drawable/icon" android:label= "@string/app_name" >
6. ? ?? ??? <activity android:name= ". Configchangedtesting "
7. ? ?? ?? ?? ?? ?? ? android:label= "@string/app_name"
8. ? ?? ?? ?? ?? ?? ? android:configchanges= "Keyboardhidden|orientation" >
9. ? ?? ?? ?? ?<intent-filter>
10. ? ?? ?? ?? ?? ? <action android:name= "Android.intent.action.MAIN"/>
11. ? ?? ?? ?? ?? ? <category android:name= "Android.intent.category.LAUNCHER"/>
12. ? ?? ?? ?? ?</intent-filter>
13. ? ?? ??? </activity>
14. ? ? </application>
15. </manifest>

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1. <manifest xmlns:android= "Http://schemas.android.com/apk/res/android"
2. ? ?? ? package= "Com.androidres.ConfigChangedTesting"
3. ? ?? ? android:versioncode= "1"
4. ? ?? ? android:versionname= "1.0.0" >
5. ? ? <application android:icon= "@drawable/icon" android:label= "@string/app_name" >
6. ? ?? ??? <activity android:name= ". Configchangedtesting "
7. ? ?? ?? ?? ?? ?? ? android:label= "@string/app_name"
8. ? ?? ?? ?? ?? ?? ? android:configchanges= "Keyboardhidden|orientation" >
9. ? ?? ?? ?? ?<intent-filter>
10. ? ?? ?? ?? ?? ? <action android:name= "Android.intent.action.MAIN"/>
11. ? ?? ?? ?? ?? ? <category android:name= "Android.intent.category.LAUNCHER"/>
12. ? ?? ?? ?? ?</intent-filter>
13. ? ?? ??? </activity>
14. ? ? </application>
15. </manifest>

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The Android:configchanges attribute is added to the activity to notify the program to call the Onconfigurationchanged () function when the specified attribute (Configuration changes) has changed. Create a layout UI:

1. <linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
2. ? ? android:orientation= "Vertical"
3. ? ? Android:layout_width= "Fill_parent"
4. ? ? android:layout_height= "Fill_parent"
5. ? ? >
6. <button
7. ? ?? ??? Android:id= "@+id/pick"
8. ? ? Android:layout_width= "Fill_parent"
9. ? ? android:layout_height= "Wrap_content"
10. ? ? android:text= "Pick"
11. ? ? />
12. <button
13. ? ?? ??? Android:id= "@+id/view"
14. ? ? Android:layout_width= "Fill_parent"
15. ? ? android:layout_height= "Wrap_content"
16. ? ? android:text= "View"
17. ? ? />
18. </LinearLayout>

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1. <linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
2. ? ? android:orientation= "Vertical"
3. ? ? Android:layout_width= "Fill_parent"
4. ? ? android:layout_height= "Fill_parent"
5. ? ? >
6. <button
7. ? ?? ??? Android:id= "@+id/pick"
8. ? ? Android:layout_width= "Fill_parent"
9. ? ? android:layout_height= "Wrap_content"
10. ? ? android:text= "Pick"
11. ? ? />
12. <button
13. ? ?? ??? Android:id= "@+id/view"
14. ? ? Android:layout_width= "Fill_parent"
15. ? ? android:layout_height= "Wrap_content"
16. ? ? android:text= "View"
17. ? ? />
18. </LinearLayout>

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This simple UI contains two buttons, one of which is to select a contact from the Contacts list, and the other is to view the details of the currently selected contact.

<ignore_js_op>

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Java source code for the project:

2. Import android.app.Activity;??
4. Import android.content.Intent;??
6. Import android.content.res.Configuration;??
8. Import Android.net.Uri;??
10. Import Android.os.Bundle;??
12. Import android.provider.Contacts.People;??
14. Import Android.view.View;??
16. Import Android.widget.Button;??
22. public class Configchangedtesting extends Activity {??
24. ? ? /** called when the activity is first created. */
26. ? ? static final int pick_request = 1337;??
28. ? ? Button viewbutton=null;??
30. ? ? Uri contact = null;??
32. ? ? @Override
34. ? ? public void OnCreate (Bundle savedinstancestate) {??
36. ? ?? ??? Super.oncreate (savedinstancestate);??
38. ? ?? ??? Setcontentview (R.layout.main);??
44. ? ?? ??? Setupviews ();??
46. ? ? }??
50. ? ? public void onconfigurationchanged (Configuration newconfig) {??
52. ? ?? ?? ?? ?? ??? Super.onconfigurationchanged (newconfig);? ?
58. ? ?? ?? ?? ?? ??? Setupviews ();??
60. ? ? }? ?
66. ? ? /* (Non-javadoc)
68. ? ??? * @see android.app.activity#onactivityresult (int, int, android.content.Intent)
70. ? ??? */
72. ? ? @Override
74. ? ? protected void Onactivityresult (int requestcode, int resultcode, Intent data) {??
76. ? ?? ??? TODO auto-generated method stub??
78. ? ?? ??? Super.onactivityresult (Requestcode, ResultCode, data);??
84. ? ?? ??? if (Requestcode = = pick_request) {??
90. ? ?? ?? ?? ? if (RESULTCODE==RESULT_OK) {??
94. ? ?? ?? ?? ?? ? Contact = Data.getdata ();??
96. ? ?? ?? ?? ?? ? Viewbutton.setenabled (true);??
98. ? ?? ?? ?? ?}??
100. ? ?? ???}??
102. ? ? }??
108. ? ? private void Setupviews () {??
112. ? ?? ??? Setcontentview (R.layout.main);??
118. ? ?? ??? Button pickbtn = (button) Findviewbyid (R.id.pick);??
122. ? ?? ??? Pickbtn.setonclicklistener (New View.onclicklistener () {??
126. ? ?? ?? ?? ? public void OnClick (View v) {??
128. ? ?? ?? ?? ?? ? TODO auto-generated method stub??
134. ? ?? ?? ?? ?? ? Intent i=new Intent (Intent.action_pick,people.content_uri);??
136. ? ?? ?? ?? ?? ? Startactivityforresult (i,pick_request);??
138. ? ?? ?? ?? ?}??
140. ? ?? ???});??
146. ? ?? ??? Viewbutton = (Button) Findviewbyid (R.id.view);? ?
152. ? ?? ??? Viewbutton.setonclicklistener (New View.onclicklistener () {??
154. ? ?? ?? ?? ?? ?? ??? public void OnClick (view view) {??
156. ? ?? ?? ?? ?? ?? ?? ?? ? startactivity (New Intent (Intent.action_view, contact));??
158. ? ?? ?? ?? ?? ?? ???}??
160. ? ?? ???});? ?
166. ? ?? ??? Viewbutton.setenabled (contact!=null);??
168. ? ? }??
170. }

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Usage of configchanges attribute in activity