Android之手机屏幕朝向
16lz
2021-12-04
模拟当点击按钮时，使手机朝向发生改变。
main.xml布局文件
<? 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
<? 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
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
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