[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" |
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" |
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.}