布局文件==》

<LinearLayout 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:orientation="horizontal"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/btnRead"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="read" />

    <Button

        android:id="@+id/btnWrite"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="write" />

</LinearLayout>

代码实现==>

package com.example.mysharedpreferences;

import java.text.SimpleDateFormat;

import java.util.Date;

import android.os.Bundle;

import android.app.Activity;

import android.content.SharedPreferences;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity

{

	SharedPreferences preferences;

	SharedPreferences.Editor editor;

	@Override

	protected void onCreate(Bundle savedInstanceState)

	{

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		// 获取只能被本地应用程序读写的SharedPreferences 对象

		preferences = getSharedPreferences("crazyit", MODE_PRIVATE);

		editor = preferences.edit();

		Button btnRead = (Button) this.findViewById(R.id.btnRead);

		Button btnWrite = (Button) this.findViewById(R.id.btnWrite);

		btnRead.setOnClickListener(new MyButtonClick());

		btnWrite.setOnClickListener(new MyButtonClick());

	}

	private class MyButtonClick implements OnClickListener

	{

		@Override

		public void onClick(View v)

		{

			switch (v.getId())

			{

			case R.id.btnRead:

				// 读取字符串数据

				String time = preferences.getString("time", null);

				// 读取int数据

				int num = preferences.getInt("num", 0);

				String result = time == null ? "您暂时还未写入数据" : "写入时间为：" + time + "\n上次随机产生的数字为" + num;

				Toast.makeText(MainActivity.this, result, 5000).show();

				break;

			case R.id.btnWrite:

				SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");

				// 存入当前时

				editor.putString("time", sdf.format(new Date()));

				editor.putInt("num", (int) (Math.random() * 100));

				// 提交所有存入的数据

				editor.commit();

				break;

			}

		}

	}

	@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;

	}

}