学习了一阵子的Android开发技术，花了几天，把不懂的，懂的晚上实践了一下，使用常用的各种方法

过几天要考驾校理论了，得看书了

 

系统登录时会自动添加用户 admin admin 登录后添加新记录，删除记录，修改密码等操作

上图

系统登录

 

 

 

数据列表

 

 

信息添加

 

 

修改密码

 

 

系统登录代码：

 

     butlogin.setOnClickListener(

new OnClickListener() {

            

            @Override

            

public 

void onClick(View v) {

                

                String user=txtuser.getText().toString();

                String Pass=txtpass.getText().toString();

            

//

    showDialog(user+"aaaaaaaaaaaaaaaaaaa"+Pass);    

                

                DBHelper dbhelper=

new DBHelper(getApplicationContext());

                Cursor c=dbhelper.queryUser();

                  

if(c.getCount()>0)

                  {

                

                      

if(c.moveToFirst())

                     {

                          

                           c.move(0);

                           String id=c.getString(0);

                           String username=c.getString(1);

                           String userpass=c.getString(2);

                           

if(user.equals(username)&&Pass.equals(userpass))

                           {

                             

//

  showDialog("正确");

                               

                               Intent intent=

new Intent(Login.

this,manage.

class);

                                startActivity(intent);

                               

                           }

                           

else

                           {

                                                   

                               showDialog("用户名或密码错误");

                               

                             

                           }

                         

                          

                         

                    

                      }

                  }

                  

else

                  {

                        ContentValues values=

new ContentValues();

                        values.put("username", "admin");

                        values.put("userpass", "admin");

                        

                        DBHelper helper=

new DBHelper(getApplicationContext());

                        helper.insertUser(values);

                        

                        Intent intent=

new Intent(Login.

this,manage.

class);

                        startActivity(intent);

                      

                  }

                

                

                

            }    

        });

        

        

       

代码比较简单，不贴了，具体请看代码 

源代码下载