本文实例讲述了android改变手机屏幕朝向的方法。分享给大家供大家参考。具体如下:
模拟当点击按钮时,使手机朝向发生改变。
main.xml布局文件:
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<?xml version= "1.0" encoding= "utf-8" ?> <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/btn" android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:text= "点击更改屏幕朝向" /> <!-- android:hint: 当文本为空时显示该文本 --> <edittext android:id= "@+id/edittext" android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:cursorvisible= "false" android:hint= "显示当前屏幕朝向" /> </linearlayout> |
清单文件:
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<?xml version= "1.0" encoding= "utf-8" ?> <manifest xmlns:android= "http://schemas.android.com/apk/res/android" package = "com.ljq.activity" android:versioncode= "1" android:versionname= "1.0" > <!-- 设置手机的朝向,不然无法获取手机的朝向 android:screenorientation= "portrait" android:configchanges= "orientation" --> <application android:icon= "@drawable/icon" android:label= "@string/app_name" > <activity android:name= ".orientationactivity" android:label= "@string/app_name" android:screenorientation= "portrait" android:configchanges= "orientation" > <intent-filter> <action android:name= "android.intent.action.main" /> <category android:name= "android.intent.category.launcher" /> </intent-filter> </activity> </application> <uses-sdk android:minsdkversion= "7" /> <!-- 改变手机配置权限 --> <uses-permission android:name= "android.permission.change_configuration" /> </manifest> |
orientationactivity类:
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package com.ljq.activity; import android.app.activity; import android.content.pm.activityinfo; import android.content.res.configuration; import android.os.bundle; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.toast; public class orientationactivity extends activity { private edittext edittext= null ; @override public void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); setcontentview(r.layout.main); edittext=(edittext)findviewbyid(r.id.edittext); button btn=(button)findviewbyid(r.id.btn); btn.setonclicklistener( new view.onclicklistener(){ public void onclick(view v) { //判断是否可以获得requestedorientation属性 if (orientationactivity. this .getrequestedorientation()==- 1 ){ toast.maketext(orientationactivity. this , "系统的朝向无法获取" , toast.length_long).show(); } else { //手机屏幕的朝向有7个可选值,分别如下 //screen_orientation_behind: 继承activity堆栈中当前activity下面的那个activity的方向 //screen_orientation_landscape: 横屏(风景照) ,显示时宽度大于高度 //screen_orientation_portrait: 竖屏 (肖像照) , 显示时高度大于宽度 //screen_orientation_nosensor: 忽略物理感应器——即显示方向与物理感应器无关, //不管用户如何旋转设备显示方向都不会随着改变("unspecified"设置除外) //screen_orientation_sensor: 由物理感应器决定显示方向,它取决于用户如何持有设备, //当设备被旋转时方向会随之变化——在横屏与竖屏之间 //screen_orientation_unspecified: 未指定,此为默认值,由android系统自己选择适当的方向, //选择策略视具体设备的配置情况而定,因此不同的设备会有不同的方向选择 //screen_orientation_user: 用户当前的首选方向 if (orientationactivity. this .getrequestedorientation()==activityinfo.screen_orientation_landscape){ orientationactivity. this .setrequestedorientation(activityinfo.screen_orientation_portrait); } else if (orientationactivity. this .getrequestedorientation()==activityinfo.screen_orientation_portrait){ orientationactivity. this .setrequestedorientation(activityinfo.screen_orientation_landscape); } } } }); } /** * 配置信息发生改变时触发 */ @override public void onconfigurationchanged(configuration newconfig) { toast.maketext( this , "系统的屏幕方向发生改变" , toast.length_long).show(); int o=getrequestedorientation(); //获取手机的朝向 switch (o) { case activityinfo.screen_orientation_landscape: edittext.settext( "当前屏幕朝向为: 横屏" ); break ; case activityinfo.screen_orientation_portrait: edittext.settext( "当前屏幕朝向为: 竖屏" ); break ; } //不能省略,否则会报android.app.supernotcalledexception: activity orientationactivity did not //call through to super.onconfigurationchanged()异常 super .onconfigurationchanged(newconfig); } } |
运行结果:
希望本文所述对大家的android程序设计有所帮助。