android SharedPreferences简单应用 插入数据 读取数据

package com.sharedpreference;  

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.Toast;  

public class SharedPreferenceActivity extends Activity {  

    SharedPreferences preferences;  

    //Editor放入值
    SharedPreferences.Editor editor;
    private Button btnWrite;
    private Button btnRead;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnRead = (Button)findViewById(R.id.read);
        btnWrite = (Button)findViewById(R.id.write);
        //context提供的getSharedPreferences获得sharedPreferences实例
        preferences = getSharedPreferences("bang", MODE_PRIVATE);
        editor = preferences.edit();
        btnRead.setOnClickListener(new OnClickListener() {  

            @Override
            public void onClick(View arg0) {
                //读取字符串数据类型
                String time = preferences.getString("time",null);  

                //读取int数据类型
                int randNum = preferences.getInt("randrom", 0);  

                String result = time == null ? "您暂时还没写入数据" : "写入时间为："+time+"\n上次生成的随机数为："+randNum;  

                Toast.makeText(SharedPreferenceActivity.this, result,5000).show();
            }
        });  

        btnWrite.setOnClickListener(new OnClickListener() {  

            @Override
            public void onClick(View arg0) {  

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

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

                editor.putInt("randrom", (int)(Math.random()*100));
                //提交保存的数据
                editor.commit();
            }
        });  

    }  

    @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;
    }  

}  

生成的shared_prefs下的xml文件为

<?xml version=‘1.0‘ encoding=‘utf-8‘ standalone=‘yes‘ ?>
<map>
    <string name="time">2014年04月14日01:10:21</string>
    <int name="randrom" value="20" />
</map>  

SharedPreferences 存储简单数据 保存键值对类型数据

android SharedPreferences简单应用 插入数据 读取数据