SharedPreferences

SharedPreferences是Android平台上一个轻量级的存储类，主要是保存一些常用的配置比如窗口状态，一般在Activity中重载窗口状态onSaveInstanceState保存一般使用SharedPreferences完成，它提供了Android平台常规的Long长整形、Int整形、String字符串型的保存，它是什么样的处理方式呢?下面就是了，不多说了 里面很详细：

界面：

新建类Preferences：

package lk.service;

import java.util.HashMap;

import java.util.Map;

import android.content.Context;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

 

public class Preferences {

      private Context context;    

      public Preferences(Context context) {

                   super();

                   this.context = context;

         }

    /**

     * 保持参数

     * @param name姓名

     * @param valueOf年龄

     */

         public void save(String name, Integer valueOf) {

                   // TODO Auto-generated method stub

                   //1.文件名称2.操作模式

                   //检索和保存参数文件的内容的“名字”,返回一个SharedPreferences通过它可以检索和修改它的值。

                   SharedPreferences preferences=context.getSharedPreferences("xxxx", Context.MODE_PRIVATE);

                   //通过编辑器存放数据

                   Editor editor=preferences.edit();

                   editor.putString("name", name);

                   editor.putInt("age", valueOf);

                   //提交方法

                   editor.commit();

         }

    /**

     * 获取各项配置参数

     * @return

     */

         public Map<String, String> getPreferences(){

                   Map<String, String> params=new HashMap<String, String>();

                   SharedPreferences preferences=context.getSharedPreferences("xxxx", Context.MODE_PRIVATE);

                   params.put("name", preferences.getString("name", ""));

                   params.put("age",String.valueOf(preferences.getInt("age",0)));

                   return params;

         }      

}

SharedPreferencesActivity.java 

package lk.n;

 

import java.util.Map;

 

import lk.service.Preferences;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

 

public class SharedPreferencesActivity extends Activity {

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

         private EditText nametext;

         private EditText agetext;

         private Preferences servie;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        //EditText nametext=(EditText) findViewById(R.id.name);

        nametext=(EditText) this.findViewById(R.id.name);

        //EditText agetext=(EditText) findViewById(R.id.age);

        agetext=(EditText) this.findViewById(R.id.age);

        servie=new Preferences(this);

        Map<String, String> params=servie.getPreferences();

        nametext.setText(params.get("name"));

        agetext.setText(params.get("age"));

    }

    public void save(View v){

             String name=nametext.getText().toString();

             String age=agetext.getText().toString();

            

             servie.save(name,Integer.valueOf(age));

             Toast.makeText(getApplicationContext(), R.string.success, 1).show();

    }

}