Android——例子：屏幕切换

效果图如下：

Android——例子：屏幕切换

Xml文件代码：

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <Button

        android:id="@+id/myBtn"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="点击切换到竖屏"

        />

    <ImageView

        android:id="@+id/showImage"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/aaa"

        />

</LinearLayout>

Java代码

package com.example.clickproject;

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.ImageView;

public class ScreenActivity extends Activity {

    private Button myBtn = null;

    private ImageView showImage = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.screen);

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

        showImage = (ImageView) findViewById(R.id.showImage);

        myBtn.setOnClickListener(new MyOnClickListenerImpl());

    }

    private class MyOnClickListenerImpl implements OnClickListener { // 单击事件

        public void onClick(View v) {

            if (ScreenActivity.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {// 无法进行画面的旋转

                ScreenActivity.this.myBtn.setText("错误：无法改变屏幕方向。");

            } else {

                if (ScreenActivity.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) { // 现在的方向是横屏显示

                    ScreenActivity.this

                            .setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // 变为竖屏显示

                } else if (ScreenActivity.this.getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { // 如果为竖屏显示

                    ScreenActivity.this

                            .setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); // 变为横屏显示

                }

            }

        }

    }

    @Override

    public void onConfigurationChanged(Configuration newConfig) { // 表示的是系统设置修改的时候触发

        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { // 现在的屏幕方向是横屏

            ScreenActivity.this.myBtn.setText("改变屏幕方向为竖屏显示（当前为横屏显示）");

            ScreenActivity.this.showImage.setImageResource(R.drawable.aaa);// 显示横屏图片

        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) { // 现在竖屏

            ScreenActivity.this.myBtn.setText("改变屏幕方向为竖屏显示（当前为横屏显示）");

            ScreenActivity.this.showImage.setImageResource(R.drawable.aaa);// 显示竖屏图片

        }

        super.onConfigurationChanged(newConfig);

    }

}

AndroidMainifest.xml文件中写入以下代码：

<activity

            android:name="com.example.clickproject.ScreenActivity"

            android:label="@string/app_name"

            android:screenOrientation="portrait"

            android:configChanges="orientation|keyboard"

             >

            <intent-filter>

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

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

            </intent-filter>

        </activity>

    </application>

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

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Android——例子：屏幕切换

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