SharedPreferences（共享参数）

public class sharp {
    Context context;                 //接收上下文对象

    public sharp(Context context) { //构造函数
        this.context = context;
    }
//存储数据
    public void read(User user){
        SharedPreferences pre=context.getSharedPreferences("pp",Context.MODE_PRIVATE);          //“pp”为共享文件名
        SharedPreferences.Editor editor=pre.edit();//创建Editor
        editor.putString("id",user.getId());        //把用户名刺入到共享文件里
        editor.putString("pwd",user.getPwd());
        editor.putString("qx",user.getQx());
        editor.commit();
    }
//读取数据
    public User write(){
        SharedPreferences shp=context.getSharedPreferences("pp",Context.MODE_PRIVATE);
        String id=shp.getString("name","no");//“no”为默认值
        String pwd=shp.getString("pwd","no");
        String qx=shp.getString("qx","no");
        User user=new User(id,pwd,qx);
        return user;
    }
}