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[转载]Activity中ConfigChanges属性的用法

2012-05-12 11:28 381 查看
[转载]Activity中ConfigChanges属性的用法

通过设置这个属性可以使Activity捕捉设备状态变化,以下是可以被识别的内容:

CONFIG_FONT_SCALE

CONFIG_MCC

CONFIG_MNC

CONFIG_LOCALE

CONFIG_TOUCHSCREEN

CONFIG_KEYBOARD

CONFIG_NAVIGATION

CONFIG_ORIENTATION

设置方法:将下列字段用“|”符号分隔开,例如:“locale|navigation|orientation



Value

Description

“mcc“

The IMSI mobile country code (MCC) has changed — that
is, a SIM hasbeen detected and updated the MCC.移动国家号码,由三位数字组成,每个国家都有自己独立的MCC,可以识别手机用户所属国家。

“mnc“

The IMSI mobile network code (MNC) has changed — that
is, a SIM hasbeen detected and updated the MNC.移动网号,在一个国家或者地区中,用于区分手机用户的服务商。

“locale“

The locale has changed — for example, the user has
selected a new language that text should be displayed in.用户所在地区发生变化。

“touchscreen“

The touchscreen has changed. (This should never
normally happen.)

“keyboard“

The keyboard type has changed — for example, the user
has plugged in an external keyboard.键盘模式发生变化,例如:用户接入外部键盘输入。

“keyboardHidden“

The keyboard accessibility has changed — for example,
the user has slid the keyboard out to expose it.用户打开手机硬件键盘

“navigation“

The navigation type has changed. (This should never
normally happen.)

“orientation“

The screen orientation has changed — that is, the user
has rotated the device.设备旋转,横向显示和竖向显示模式切换。

“fontScale“

The font scaling factor has changed — that is, the user
has selected a new global font size.全局字体大小缩放发生改变

通过一个例子介绍这个属性的用法: 首先需要修改项目的manifest:

?View Code XML

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.androidres.ConfigChangedTesting"

android:versionCode="1"

android:versionName="1.0.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity
android:name=".ConfigChangedTesting"

android:label="@string/app_name"

android:configChanges="keyboardHidden|orientation">

<intent-filter>

<action
android:name="android.intent.action.MAIN" />

<category
android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

</manifest>

在Activity中添加了
android:configChanges属性,目的是当所指定属性(Configuration
Changes)发生改变时,通知程序调用 onConfigurationChanged()函数。
创建一个Layout UI:

?View Code XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<Button

android:id="@+id/pick"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Pick"

/>

<Button

android:id="@+id/view"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="View"

/>

</LinearLayout>

这个简单的UI包含两个按钮,其中一个是通过Contact列表选择一个联系人,另外一个是查看当前选择联系人的详细内容。

项目的Java源代码:

01.import android.app.Activity;

02.import android.content.Intent;

03.import android.content.res.Configuration;

04.import android.net.Uri;

05.import android.os.Bundle;

06.import android.provider.Contacts.People;

07.import android.view.View;

08.import android.widget.Button;

09.

10.public class ConfigChangedTesting extends Activity {

11. /** Called when the activity is first created. */

12. static final int PICK_REQUEST = 1337;

13. Button viewButton=null;

14. Uri contact = null;

15. @Override

16. public void onCreate(Bundle savedInstanceState) {

17. super.onCreate(savedInstanceState);

18. //setContentView(R.layout.main);

19.

20. setupViews();

21. }

22.

23. public void onConfigurationChanged(Configuration newConfig) {

24.
super.onConfigurationChanged(newConfig);

25.

26.
setupViews();

27. }

28.

29. /* (non-Javadoc)

30. * @see android.app.Activity#onActivityResult(int,
int, android.content.Intent)

31. */

32. @Override

33. protected void onActivityResult(int requestCode, int
resultCode, Intent data) {

34. // TODO Auto-generated method stub

35. //super.onActivityResult(requestCode,
resultCode, data);

36.

37. if(requestCode == PICK_REQUEST){

38.

39.
if(resultCode==RESULT_OK){

40.

41. contact =
data.getData();

42.
viewButton.setEnabled(true);

43. }

44.

45. }

46.

47. }

48.

49. private void setupViews(){

50.

51. setContentView(R.layout.main);

52.

53. Button pickBtn =
(Button)findViewById(R.id.pick);

54.

55. pickBtn.setOnClickListener(new
View.OnClickListener(){

56.

57. public void onClick(View
v) {

58. // TODO
Auto-generated method stub

59.

60. Intent
i=new Intent(Intent.ACTION_PICK,People.CONTENT_URI);

61.
startActivityForResult(i,PICK_REQUEST);

62. }

63. });

64.

65. viewButton
=(Button)findViewById(R.id.view);

66.

67. viewButton.setOnClickListener(new
View.OnClickListener() {

68.
public void onClick(View view) {

69.
startActivity(new Intent(Intent.ACTION_VIEW,
contact));

70.
}

71. });

72.

73. viewButton.setEnabled(contact!=null);

74. }

75.}
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