android:configChanges

一般在AndroidManifest.xml文件中都没有使用到android:configChanges="keyboardHidden|orientation"配置，当然还是很有用的哈

就是如果配置了这个属性，当我们横竖屏切换的时候会直接调用onCreate方法中的onConfigurationChanged方法，而不会重新执行onCreate方法，那当然如果不配置这个属性的话就会重新调用onCreate方法了，下面是测试

                    <?xmlversion="1.0"encoding="utf-8"?>
            <manifestxmlns:android="http://schemas.android.com/apk/res/android"
            package="com.test"
            android:versionCode="1"
            android:versionName="1.0">
            <uses-sdkandroid:minSdkVersion="8"/>
            
            <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
            <activityandroid:name=".TestActivity"
            android:label="@string/app_name"
            android:configChanges="keyboardHidden|orientation">
            <intent-filter>
            <actionandroid:name="android.intent.action.MAIN"/>
            <categoryandroid:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            </activity>
            
            </application>
            </manifest>

MainActivtiy.java

                    packagecom.example.testforshape;
            
            importandroid.os.Bundle;
            importandroid.app.Activity;
            importandroid.content.res.Configuration;
            importandroid.graphics.Bitmap;
            importandroid.graphics.BitmapFactory;
            importandroid.graphics.drawable.BitmapDrawable;
            importandroid.graphics.drawable.Drawable;
            importandroid.view.Menu;
            importandroid.view.MenuItem;
            importandroid.view.Window;
            importandroid.widget.TextView;
            importandroid.support.v4.app.NavUtils;
            
            publicclassMainActivityextendsActivity{
            
            @Override
            publicvoidonCreate(BundlesavedInstanceState){
            super.onCreate(savedInstanceState);
            
            setContentView(R.layout.activity_main);
            
            System.out.println("oncreadtes");
            }
            @Override
            publicvoidonConfigurationChanged(ConfigurationnewConfig){
            System.out.println("config改变");
            if(newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE)
            {
            System.out.println("横");
            }
            elseif(newConfig.orientation==Configuration.ORIENTATION_PORTRAIT)
            {
            System.out.println("竖");
            }
            super.onConfigurationChanged(newConfig);
            }
            
            @Override
            publicbooleanonCreateOptionsMenu(Menumenu){
            getMenuInflater().inflate(R.menu.activity_main,menu);
            returntrue;
            }
            
            
            }

运行截图:

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