1. 存储单个JavaBean

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE",Activity.MODE_PRIVATE);//创建sp对象,如果有key为"SP_PEOPLE"的sp就取出，否则就创建一个此key的sp对象
People people= new People() ;//创建javabean对象
people.setId(1);  
people.setName("小邵");
Gson gson = new Gson();  
String jsonStr=gson.toJson(people); //将对象转换成Json
editor = sp.edit() ;
editor.putString("KEY_PEOPLE_DATA", jsonStr) ; //存入json串
editor.commit() ; //提交
ShowDialog("您已经保存成功");

2. 存储JavBean的List集合

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE_List",Activity.MODE_PRIVATE);//创建sp对象
List<People> peopleList = new ArrayList<People>() ; //创建List集合对象
People people1= new People() ;//创建javabean对象
people1.setId(1);  
people1.setName("小邵"); 
People people2= new People() ;//创建javabean对象
people2.setId(2);  
people2.setName("小林"); 
peopleList.add(people1);
peopleList.add(people2);

Gson gson = new Gson();  
String jsonStr=gson.toJson(peopleList); //将List转换成Json
SharedPreferences.Editor editor = sp.edit() ;
editor.putString("KEY_PEOPLE_LIST_DATA", jsonStr) ; //存入json串
editor.commit() ;  //提交
ShowDialog("您已经保存成功");

3. 从SP中查询一个JavaBean

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE",Activity.MODE_PRIVATE);//创建sp对象,如果有key为"SP_PEOPLE"的sp就取出
peopleJson = sp.getString("KEY_PEOPLE_DATA","");  //取出key为"KEY_PEOPLE_DATA"的值，如果值为空，则将第二个参数作为默认值赋值
if(peopleJson!="")  //防空判断
{
Gson gson = new Gson();  
People people = gson.fromJson(peopleJson, People.class); //将json字符串转换成 people对象
}

4. 从SP中查询javaBean集合

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE_LIST",Activity.MODE_PRIVATE);//创建sp对象,如果有key为"SP_PEOPLE"的sp就取出
peopleListJson = sp.getString("KEY_PEOPLE_LIST_DATA","");  //取出key为"KEY_PEOPLE_DATA"的值，如果值为空，则将第二个参数作为默认值赋值
if(peopleJson!="")  //防空判断
{
Gson gson = new Gson();  
List<People> peopleList = gson.fromJson(peopleListJson, new TypeToken<List<People>>() {}.getType()); //将json字符串转换成List集合
}

5. 删除一个JavaBean

直接把sp干掉。

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE",Activity.MODE_PRIVATE);//创建sp对象,如果有key为"SP_PEOPLE"的sp就取出
peopleJson = sp.getString("KEY_PEOPLE_DATA","");  
SharedPreferences.Editor editor = sp.edit() ;
editor.clear();
editor.commit();

6. 删除List中的某个javaBean

1.先取，
2.转换成List，
3.从List中删掉，
4.转换成新List,
5.存入新json串将原先的替换掉。

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE_LIST",Activity.MODE_PRIVATE);
peopleListJson = sp.getString("KEY_PEOPLE_LIST_DATA","");  
if(peopleJson!="")  //防空判断
{
Gson gson = new Gson();  
 List<People> peopleList = gson.fromJson(peopleListJson, new TypeToken<List<People>>() {
}.getType()); //1.2\. 取出并转换成List

peopleList.remove(position) ; //3.移除第position个的javabean
String jsonStr=gson.toJson(peopleList); //4.将删除完的List转换成Json
SharedPreferences.Editor editor = sp.edit() ;
editor.putString("KEY_PEOPLE_LIST_DATA", jsonStr) ; //存入json串
editor.commit() ;  //提交
}

7. 更新

先取，将要改变的bean更新了 ，转换成List，存入新json串将原先的替换掉。

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SharedPreferences sp = getSharedPreferences("SP_PEOPLE_LIST",Activity.MODE_PRIVATE);
peopleListJson = sp.getString("KEY_PEOPLE_LIST_DATA","");  
if(peopleJson!="")  //防空判断
{
Gson gson = new Gson();  
     List<People> peopleList = gson.fromJson(peopleListJson, new TypeToken<List<People>>() {
}.getType()); //取出

**// 省略的操作：取出，更新bean的操作，添加到List,将新List转换成json**

SharedPreferences.Editor editor = sp.edit() ;
editor.putString("KEY_PEOPLE_LIST_DATA", jsonStr) ; //存入json串
editor.commit() ;  //提交
}