Android(安卓)savedInstanceState的作用和用法

http://hi.baidu.com/guoxiaoming/item/d38f1303e9e1b2d21ff046ce

代码如下：

好多博客和帖子都会有下面这个例子，这个是用savedInstanceState保存的一个例子，但是仅仅这一个Activity是不是看不到效果，因为我在模拟器里面运行，按home键返回，是可以通过log看到onSaveInstanceState调用的，但是再进入应用程序是不会调用onCreate（），因为按home键失去焦点，应该是到onStop（）的阶段。那么通过这个程序如何看出savedInstanceState是保存值了呢。onCreat中的if条件是进不去的。还有onRestoreInstanceState怎么才能被调用呢

package com.myandroid.test;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

public class AndroidTest extends Activity {

private static final String TAG = "MyNewLog";

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// If an instance of this activity had previously stopped, we can

// get the original text it started with.

if(null != savedInstanceState)

{

int IntTest = savedInstanceState.getInt("IntTest");

String StrTest = savedInstanceState.getString("StrTest");

Log.e(TAG, "onCreate get the savedInstanceState+IntTest="+IntTest+"+StrTest="+StrTest);

}

setContentView(R.layout.main);

Log.e(TAG, "onCreate");

}

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

// Save away the original text, so we still have it if the activity

// needs to be killed while paused.

savedInstanceState.putInt("IntTest", 0);

savedInstanceState.putString("StrTest", "savedInstanceState test");

super.onSaveInstanceState(savedInstanceState);

Log.e(TAG, "onSaveInstanceState");

}

@Override

public void onRestoreInstanceState(Bundle savedInstanceState) {

super.onRestoreInstanceState(savedInstanceState);

int IntTest = savedInstanceState.getInt("IntTest");

String StrTest = savedInstanceState.getString("StrTest");

Log.e(TAG, "onRestoreInstanceState+IntTest="+IntTest+"+StrTest="+StrTest);

}

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