Android开发之改动屏幕方向

有的场景下，我们须要把手机屏幕方向改变，以下是我写的一个样例。

xml页面文件：

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

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity"
>

<Button

android:id="@+id/btn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentTop="true"

android:text="改动屏幕方向"
/>

</RelativeLayout>

页面java文件：

package com.example.chcfg;

import android.os.Bundle;

import android.app.Activity;

import android.content.pm.ActivityInfo;

import android.content.res.Configuration;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity
extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btn = (Button)findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener()

{

public
void onClick(View source) {

//
TODO Auto-generated method stub

Configuration config = getResources().getConfiguration();

if(config.orientation == Configuration.ORIENTATION_LANDSCAPE)

{

//设置为竖屏

MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

}

//假设当前是竖屏

if(config.orientation == Configuration.ORIENTATION_PORTRAIT)

{

MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

}

}

});

}

@Override

public void onConfigurationChanged(Configuration newConfig) {

//
TODO Auto-generated method stub

super.onConfigurationChanged(newConfig);

String screen = newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE ?
"横向屏幕" : "纵向屏幕";

Toast.makeText(this,
"系统屏幕方向发生改变\n改动后的方向为：" + screen , Toast.LENGTH_LONG).show();

}

}

MainFest xml文件：

<?xml
version="1.0"
encoding="utf-8"?

>

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

package="com.example.chcfg"

android:versionCode="1"

android:versionName="1.0"
>

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="18"
/>

<uses-permission
android:name="android.permission.CHANGE_CONFIGURATION"/>

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme"
>

<activity

android:name="com.example.chcfg.MainActivity"

android:label="@string/app_name"

android:configChanges="orientation">

<intent-filter>

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

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

</intent-filter>

</activity>

</application>

</manifest>

个人辛勤劳动成果，如有转载。请注明出处。谢谢。