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>

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();

}

}

<?

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>