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 |
?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:
import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.view.View;
import android.widget.Button;
public class ConfigChangedTesting extends Activity {
/** Called when the activity is first created. */
static final int PICK_REQUEST = 1337;
Button viewButton=null;
Uri contact = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setupViews();
}
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setupViews();
}
/* (non-Javadoc)
* @see android.app.Activity#onActivityResult(int, int, android.content.Intent)
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
//super.onActivityResult(requestCode, resultCode, data);
if(requestCode == PICK_REQUEST){
if(resultCode==RESULT_OK){
contact = data.getData();
viewButton.setEnabled(true);
}
}
}
private void setupViews(){
setContentView(R.layout.main);
Button pickBtn = (Button)findViewById(R.id.pick);
pickBtn.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(Intent.ACTION_PICK,People.CONTENT_URI);
startActivityForResult(i,PICK_REQUEST);
}
});
viewButton =(Button)findViewById(R.id.view);
viewButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivity(new Intent(Intent.ACTION_VIEW, contact));
}
});
viewButton.setEnabled(contact!=null);
}
}