前两篇介绍了主页面和Student，这一篇来讲Book类和工作人员。
Book是图书管理系统的核心，查书，借书，还书，增加书都与Book类息息相关。Book类的设计很简单：包含信息：名称、作者、页数、价钱、出版日期、数量、在架数量。
Book类的代码：
1 package com.example.administrator.library1;
2
3 import org.litepal.annotation.Column;
4 import org.litepal.crud.LitePalSupport;
5
6 public class Book extends LitePalSupport{
7 int id;
8 private String name;
9 private String writer,page,price,time;
10 private int amount,in_shelf;
11 public Book(String name,String writer,String page,String price,String time,int amount)
12 {
13 this.name=name;
14 this.writer=writer;
15 this.page=page;
16 this.price=price;
17 this.time=time;
18 this.amount=amount;
19 in_shelf=amount;
20 }
21 public void setAmount(int amount) {
22 this.amount = amount;
23 }
24 public int getAmount() {
25 return amount;
26 }
27 public void setIn_shelf(int in_shelf) {
28 this.in_shelf = in_shelf;
29 }
30 public int getIn_shelf() {
31 return in_shelf;
32 }
33 public void setId(int id) {
34 this.id = id;
35 }
36 public int getId() {
37 return id;
38 }
39 public void setName(String name) {
40 this.name = name;
41 }
42 public void setPrice(String price) {
43 this.price = price;
44 }
45 public void setPage(String page) {
46 this.page = page;
47 }
48 public void setTime(String time) {
49 this.time = time;
50 }
51 public void setWriter(String writer) {
52 this.writer = writer;
53 }
54 public String getName() {
55 return name;
56 }
57 public String getPage() {
58 return page;
59 }
60 public String getPrice() {
61 return price;
62 }
63 public String getTime() {
64 return time;
65 }
66 public String getWriter() {
67 return writer;
68 }
69
70 }
Book
Staff的类也很简单，包含职员的一些个人信息。
1 package com.example.administrator.library1;
2
3 import org.litepal.LitePal;
4 import org.litepal.crud.LitePalSupport;
5
6 public class Staff extends LitePalSupport {
7 private int id;
8 private String account,password,name,staff_number,mail_box;
9 int age;
10 public Staff(String account,String password,String name,String staff_number,String mail_box,int age)
11 {
12 this.account=account;
13 this.age=age;
14 this.staff_number=staff_number;
15 this.mail_box=mail_box;
16 this.password=password;
17 this.name=name;
18 }
19
20 public int getId() {
21 return id;
22 }
23 public String getName() {
24 return name;
25 }
26 public String getPassword() {
27 return password;
28 }
29 public int getAge() {
30 return age;
31 }
32 public String getStaff_number() {
33 return staff_number;
34 }
35 public String getMail_box() {
36 return mail_box;
37 }
38 public String getAccount() {
39 return account;
40 }
41 public void setName(String name) {
42 this.name = name;
43 }
44 public void setId(int id) {
45 this.id = id;
46 }
47 public void setPassword(String password) {
48 this.password = password;
49 }
50 public void setAge(int age) {
51 this.age = age;
52 }
53 public void setAccount(String account) {
54 this.account = account;
55 }
56 public void setMail_box(String mail_box) {
57 this.mail_box = mail_box;
58 }
59 public void setStaff_number(String staff_number) {
60 this.staff_number = staff_number;
61 }
62 }
Staff
职员的登录界面，大致与Student的登录界面相同这里只将代码贴出：
1 package com.example.administrator.library1;
2
3 import android.content.Intent;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.view.View;
7 import android.widget.Button;
8 import android.widget.CheckBox;
9 import android.widget.EditText;
10 import android.widget.Toast;
11
12 import org.litepal.LitePal;
13
14 import java.util.List;
15
16 public class Login_staff extends AppCompatActivity {
17
18 private EditText staff_editAccount,staff_editPassword;
19 private CheckBox staff_checkBox;
20 private Button staff_button_commit;
21 @Override
22 protected void onCreate(Bundle savedInstanceState) {
23 super.onCreate(savedInstanceState);
24 setContentView(R.layout.activity_login_staff);
25 staff_editAccount=findViewById(R.id.accountStaff_id);
26 staff_editPassword=findViewById(R.id.passwordStaff_id);
27 staff_checkBox=findViewById(R.id.rememberPassStaff_id);
28 staff_button_commit=findViewById(R.id.commitStaff_id);
29 Simple simple=LitePal.find(Simple.class,3);
30 staff_editAccount.setText(simple.getAccount());
31 staff_editPassword.setText(simple.getPassword());
32
33 staff_button_commit.setOnClickListener(new View.OnClickListener() {
34 @Override
35 public void onClick(View view) { //在这里之前已经出错
36 List<Staff> staffs_account = LitePal.findAll(Staff.class);
37 boolean is_account_available = false;
38 String st_account = staff_editAccount.getText().toString();
39 String st_password = staff_editPassword.getText().toString();
40 for (int i = 0; i < staffs_account.size(); ++i) {
41 if (st_account.equals(staffs_account.get(i).getAccount())) { //get（i）这里的查询是从0开始的，即是get（0）查询的是id为1的员工
42 is_account_available = true;
43 if (st_password.equals(staffs_account.get(i).getPassword())) {
44 if(staff_checkBox.isChecked())
45 {
46 Simple simple= LitePal.find(Simple.class,3);
47 simple.setAccount(staff_editAccount.getText().toString());
48 simple.setPassword(staff_editPassword.getText().toString());
49 simple.save();
50 }
51 else
52 {
53 Simple simple1=LitePal.find(Simple.class,3);
54 simple1.setAccount("");
55 simple1.setPassword("");
56 simple1.save();
57 }
58 Intent intent = new Intent(Login_staff.this, Staff_homepage.class);
59 intent.putExtra("extra_data", i+1);
60 startActivity(intent);
61 finish();
62 } else {
63 Toast.makeText(Login_staff.this, "密码错误", Toast.LENGTH_SHORT).show();
64 break; //记住密码还没有用上
65 }
66 }
67 }
68 if (is_account_available == false) {
69 Toast.makeText(Login_staff.this, "账号不存在", Toast.LENGTH_SHORT).show();
70 }
71 }
72 });
73 }
74 }
Login_Staff
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:app="http://schemas.android.com/apk/res-auto"
4 android:orientation="vertical"
5 xmlns:tools="http://schemas.android.com/tools"
6 android:layout_width="match_parent"
7 android:layout_height="match_parent"
8 tools:context=".Login_student">
9
10 <ImageView
11 android:layout_width="match_parent"
12 android:layout_height="211dp"
13 android:src="@drawable/img_login" />
14 <LinearLayout
15 android:layout_width="match_parent"
16 android:layout_height="wrap_content"
17 android:layout_marginTop="20dp"
18 android:layout_marginLeft="20dp"
19 android:layout_marginRight="20dp"
20 android:orientation="horizontal">
21 <TextView
22 android:layout_width="0dp"
23 android:layout_height="match_parent"
24 android:layout_weight="1"
25 android:textSize="21sp"
26 android:text="账号： "/>
27 <EditText
28 android:id="@+id/accountStaff_id"
29 android:layout_width="0dp"
30 android:layout_height="match_parent"
31 android:layout_weight="5"
32 android:hint="type here"/>
33 </LinearLayout>
34 <LinearLayout
35 android:orientation="horizontal"
36 android:layout_width="match_parent"
37 android:layout_marginLeft="20dp"
38 android:layout_marginRight="20dp"
39 android:layout_height="wrap_content">
40 <TextView
41 android:layout_width="0dp"
42 android:layout_height="match_parent"
43 android:layout_weight="1"
44 android:textSize="21sp"
45 android:text="密码 :"/>
46 <EditText
47 android:id="@+id/passwordStaff_id"
48 android:layout_width="0dp"
49 android:layout_height="match_parent"
50 android:layout_weight="5"
51 android:hint="type here"/>
52 </LinearLayout>
53 <LinearLayout
54 android:layout_marginLeft="20dp"
55 android:layout_marginRight="20dp"
56 android:layout_width="match_parent"
57 android:layout_height="wrap_content">
58 <CheckBox
59 android:id="@+id/rememberPassStaff_id"
60 android:layout_width="wrap_content"
61 android:layout_height="wrap_content"
62 android:checked="true"/>
63 <TextView
64 android:layout_width="wrap_content"
65 android:layout_height="wrap_content"
66 android:textSize="18sp"
67 android:text="记住密码"/>
68 </LinearLayout>
69 <Button
70 android:id="@+id/commitStaff_id"
71 android:layout_width="150dp"
72 android:layout_height="wrap_content"
73 android:layout_gravity="center"
74 android:textSize="20sp"
75 android:text="登录"/>
76 </LinearLayout>
Staff_login_xml
下面讲述staff职员的个人主页，中间有两个Button，分别是添加书籍和返回。
点击添加书籍会进入另一个界面填写新入库的书籍信息，提交后将返回职员的主页。
由于进入填写信息的界面再次返回职员主页后，此时想要返回MainActivity需要点击三下手机自带的返回键，于是在职员主页中添加了一个返回按钮。
下面使用了listview，展示当前图书馆所有书籍的名称、作者与各本书的数量。
代码贴出来如下：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:app="http://schemas.android.com/apk/res-auto"
4 xmlns:tools="http://schemas.android.com/tools"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 android:orientation="vertical"
8 tools:context=".Staff_homepage">
9 <ImageView
10 android:layout_width="match_parent"
11 android:layout_height="wrap_content"
12 android:src="@drawable/img_login"/>
13 <TextView
14 android:id="@+id/sta_home_infor_id"
15 android:layout_width="match_parent"
16 android:layout_height="wrap_content"
17 android:layout_gravity="center"
18 android:gravity="center"
19 android:textSize="20sp"/>
20 <Button
21 android:id="@+id/sta_input_book_id"
22 android:layout_width="match_parent"
23 android:layout_height="wrap_content"
24 android:text="增加书籍"/>
25 <Button
26 android:id="@+id/sta_return_id"
27 android:layout_width="match_parent"
28 android:layout_height="wrap_content"
29 android:text="返回主菜单"/>
30 <ListView
31 android:id="@+id/staff_home_list_id"
32 android:layout_width="match_parent"
33 android:layout_height="wrap_content">
34 </ListView>
35 </LinearLayout>
Staff_homepage_xml
1 package com.example.administrator.library1;
2
3 import android.content.Intent;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.view.View;
7 import android.widget.ArrayAdapter;
8 import android.widget.Button;
9 import android.widget.ListView;
10 import android.widget.TextView;
11
12 import org.litepal.LitePal;
13
14 import java.util.ArrayList;
15 import java.util.List;
16
17 public class Staff_homepage extends AppCompatActivity {
18 private int staff_id;
19 Staff staff;
20 private TextView textView_name;
21 private Button button_add,button_return;
22 private List<Book> totalbooks=new ArrayList<>();
23 private List<String> booknames=new ArrayList<>();
24 @Override
25 protected void onCreate(Bundle savedInstanceState) {
26 super.onCreate(savedInstanceState);
27 setContentView(R.layout.activity_staff_homepage);
28 textView_name = (TextView) findViewById(R.id.sta_home_infor_id);
29 button_add = (Button) findViewById(R.id.sta_input_book_id);
30 button_return = (Button) findViewById(R.id.sta_return_id);
31 totalbooks = LitePal.findAll(Book.class);
32
33 final Intent intent = getIntent();
34 staff_id = intent.getIntExtra("extra_data", 1);
35 staff = LitePal.find(Staff.class, staff_id);
36 textView_name.setText("员工编号: " + staff.getId() + " " + "姓名: " + staff.getName());
37
38 button_add.setOnClickListener(new View.OnClickListener() {
39 @Override
40 public void onClick(View view) {
41 Intent intent1 = new Intent(Staff_homepage.this, staff_input.class);
42 startActivity(intent1);
43 }
44 });
45
46 button_return.setOnClickListener(new View.OnClickListener() {
47 @Override
48 public void onClick(View view) {
49 Intent intent = new Intent(Staff_homepage.this, MainActivity.class);
50 startActivity(intent);
51 }
52 });
53
54 for (int i = 0; i < totalbooks.size(); ++i) {
55 booknames.add("名称:" + totalbooks.get(i).getName() + " " + "作者:" + totalbooks.get(i).getWriter() + " " + "数量:" + totalbooks.get(i).getAmount());
56 }
57 ArrayAdapter<String> adapter = new ArrayAdapter<String>(Staff_homepage.this, android.R.layout.simple_list_item_1, booknames);
58 ListView listView = (ListView) findViewById(R.id.staff_home_list_id);
59 listView.setAdapter(adapter);
60 }
61 }
Staff_homepage
运行是界面如图：
关于职员的功能介绍完毕，下一篇来讲述图书馆app的新书上架、借阅排行、黑名单、图书馆介绍、图书馆新闻模块。