android 转屏 onConfigurationChanged 不会执行的问题

package com.example.configchangesample;

 
import android.os.Bundle;
import android.app.Activity;
import android.content.res.Configuration;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
    
    TextView textView1;
    String TAG = "configchangesample";
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        textView1 = (TextView)this.findViewById(com.example.configchangesample.R.id.textView1);
        textView1.setText("init");
        Log.i(TAG, "onCreate");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        textView1.setText("onConfigurationChanged");
        Log.i(TAG, "onConfigurationChanged:" + newConfig.orientation);
        
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){
            textView1.setText("ORIENTATION_LANDSCAPE");
        } else {
             
            textView1.setText("ORIENTATION_PORTRAIT");
        }
        
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.configchangesample"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.configchangesample.MainActivity"
            android:label="@string/app_name"
            android:configChanges="orientation|screenSize" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>