实验目的：
分别使用sqlite3工具和Android代码的方式建立SQLite数据库。在完成建立数据库的工作后，编程实现基本的数据库操作功能，包括数据的添加、删除和更新。
实验要求：
- 创建一个学生管理的应用，基本信息包含学生姓名，班级，学号。采用数据库存储这些信息。
- 应用应该至少包含信息录入和删除功能。
- 数据显示考虑采用ListView。
(1) 使用sqlite3工具建库：
使用adb前，需要先把adb加入环境变量：C:\Users\Flyuz\AppData\Local\Android\Sdk\platform-tools
然后在cmd或android studio命令行中进入adb shell。
出现的问题：
Android 7无法获得root权限，不能进入data/data/com.example.flyuz.sqlite6文件夹，所以不能建库，
解决方法：1 在命令行中前后使用 adb root adb remount （我不管用）
2 使用Android 6的虚拟机即可获得root权限。
步骤：
进入adb shell
cd data/data/com.example.flyuz.sqlite6
建数据库文件夹 mkdir databases
建数据库 sqlite3 student.db
Create table studentinfo(num text PRIMARY KEY, name text not null, cla text not null);
添加数据 insert into studentinfo()
查看所有表 .tables
1 package com.example.flyuz.sqlite6;
2
3 import android.support.v7.app.AppCompatActivity;
4 import android.os.Bundle;
5 import android.view.View;
6 import android.view.MenuItem;
7 import android.widget.Button;
8 import android.widget.ListView;
9 import android.widget.ArrayAdapter;
10 import android.widget.EditText;
11 import android.widget.PopupMenu;
12 import android.widget.AdapterView;
13
14 import java.util.List;
15 import java.util.ArrayList;
16
17 public class MainActivity extends AppCompatActivity {
18 private Button bt_add;
19 private ListView lv;
20 private DBAdapter dbAdapter;
21
22 @Override
23 protected void onCreate(Bundle savedInstanceState) {
24 super.onCreate(savedInstanceState);
25 setContentView(R.layout.activity_main);
26 bt_add = (Button) findViewById(R.id.bt_add);
27 lv = (ListView) findViewById(R.id.lv);
28 dbAdapter = new DBAdapter(this);
29 dbAdapter.open();
30 init();
31 }
32
33 private void init() {
34 Student[] students = dbAdapter.queryAllData();
35
36 List<String> list = new ArrayList<String>();
37 if (students != null) {
38 for (Student stu : students) {
39 list.add(stu.toString());
40 }
41 }
42 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
43 lv.setAdapter(adapter);
44
45 //设置事件
46 bt_add.setOnClickListener(new View.OnClickListener() {
47 public void onClick(View v) {
48 EditText et_class = (EditText) findViewById(R.id.et_class);
49 EditText et_number = (EditText) findViewById(R.id.et_number);
50 EditText et_name = (EditText) findViewById(R.id.et_name);
51
52 String str_class = et_class.getText().toString();
53 String str_number = et_number.getText().toString();
54 String str_name = et_name.getText().toString();
55
56 Student student = new Student();
57 student.setNum(str_number);
58 student.setName(str_name);
59 student.setCla(str_class);
60 long colunm = dbAdapter.insert(student);
61
62 ArrayAdapter add_adp = (ArrayAdapter) lv.getAdapter();
63 add_adp.add(student.toString());
64 }
65 });
66 lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
67 @Override
68 public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
69 PopupMenu popup = new PopupMenu(MainActivity.this, view);
70 popup.getMenuInflater().inflate(R.menu.menu, popup.getMenu());
71 popup.show();
72 popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
73 @Override
74 public boolean onMenuItemClick(MenuItem item) {
75 switch (item.getItemId()) {
76 case R.id.menu_del:
77 ArrayAdapter temp_adp = (ArrayAdapter) lv.getAdapter();
78 String delStu = (String) temp_adp.getItem(position);
79 String[] num = delStu.split("\\s+");
80 String[] res = num[0].split(":");
81 long colunm = dbAdapter.deleteOneData(Integer.parseInt(res[1]));
82 temp_adp.remove(temp_adp.getItem(position));
83 return true;
84 default:
85 return false;
86 }
87 }
88 });
89 return true;
90 }
91 });
92 }
93 }
1 package com.example.flyuz.sqlite6;
2
3 import android.content.ContentValues;
4 import android.content.Context;
5 import android.database.Cursor;
6 import android.database.sqlite.SQLiteDatabase;
7 import android.database.sqlite.SQLiteException;
8 import android.database.sqlite.SQLiteOpenHelper;
9 import android.database.sqlite.SQLiteDatabase.CursorFactory;
10
11 /**
12 * Created by Administrator on 2018/10/29.
13 */
14
15 public class DBAdapter {
16 private static final String DB_NAME = "student.db";
17 private static final String DB_TABLE = "studentinfo";
18 private static final int DB_VERSION = 1;
19
20 //public static final String KEY_ID = "id";
21 public static final String KEY_NAME = "name";
22 public static final String KEY_NUM = "num";
23 public static final String KEY_CLA = "cla";
24
25 private SQLiteDatabase db;
26 private final Context context;
27
28 public DBAdapter(Context _context) {
29 context = _context;
30 }
31
32 /** Close the database */
33 public void close() {
34 if (db != null){
35 db.close();
36 db = null;
37 }
38 }
39
40 /** Open the database */
41 public void open() throws SQLiteException {
42 DBOpenHelper dbOpenHelper = new DBOpenHelper(context, DB_NAME, null, DB_VERSION);
43 try {
44 db = dbOpenHelper.getWritableDatabase();
45 }
46 catch (SQLiteException ex) {
47 db = dbOpenHelper.getReadableDatabase();
48 }
49 }
50
51 private static class DBOpenHelper extends SQLiteOpenHelper {
52
53 public DBOpenHelper(Context context, String name, CursorFactory factory, int version) {
54 super(context, name, factory, version);
55 }
56
57 private static final String DB_CREATE =
58 "create table " + DB_TABLE
59 + "("
60 + KEY_NUM + " text PRIMARY KEY,"
61 + KEY_NAME + " text not null, "
62 + KEY_CLA + " text not null" +" );";
63
64 @Override
65 public void onCreate(SQLiteDatabase _db) {
66 _db.execSQL(DB_CREATE);
67 }
68
69 @Override
70 public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion) {
71 _db.execSQL("DROP TABLE IF EXISTS " + DB_TABLE);
72 onCreate(_db);
73 }
74 }
75
76 public long insert(Student student) {
77 ContentValues newValues = new ContentValues();
78
79 newValues.put(KEY_NUM, student.getNum());
80 newValues.put(KEY_NAME, student.getName());
81 newValues.put(KEY_CLA, student.getCla());
82
83 return db.insert(DB_TABLE, null, newValues);
84 }
85
86 public Student[] queryAllData() {
87 Cursor results = db.query(DB_TABLE, new String[] { KEY_NUM, KEY_NAME, KEY_CLA},
88 null, null, null, null, null);
89 return ConvertToStudent(results);
90 }
91 public Student[] queryOneData(long id) {
92 Cursor results = db.query(DB_TABLE, new String[] { KEY_NUM, KEY_NAME, KEY_CLA},
93 KEY_NUM + "=" + id, null, null, null, null);
94 return ConvertToStudent(results);
95 }
96
97 private Student[] ConvertToStudent(Cursor cursor){
98 int resultCounts = cursor.getCount();
99 if (resultCounts == 0 || !cursor.moveToFirst()){
100 return null;
101 }
102
103 Student[] students = new Student[resultCounts];
104 for (int i = 0 ; i<resultCounts; i++){
105 students[i] = new Student();
106
107 students[i].setNum(cursor.getString(cursor.getColumnIndex(KEY_NUM)));
108 students[i].setName(cursor.getString(cursor.getColumnIndex(KEY_NAME)));
109 students[i].setCla( cursor.getString(cursor.getColumnIndex(KEY_CLA)));
110
111 cursor.moveToNext();
112 }
113 return students;
114 }
115
116
117 public long deleteAllData() {
118 return db.delete(DB_TABLE, null, null);
119 }
120
121 public long deleteOneData(long id) {
122 return db.delete(DB_TABLE, KEY_NUM + "=" + id, null);
123 }
124
125 public long updateOneData(long id , Student student){
126 ContentValues updateValues = new ContentValues();
127
128 updateValues.put(KEY_NUM, student.getNum());
129 updateValues.put(KEY_NAME, student.getName());
130 updateValues.put(KEY_CLA, student.getCla());
131
132 return db.update(DB_TABLE, updateValues, KEY_NUM+ "=" + id, null);
133 }
134 }
1 package com.example.flyuz.sqlite6;
2
3 /**
4 * Created by Administrator on 2018/10/29.
5 */
6
7 public class Student {
8 private String Num;
9 private String Name;
10 private String Cla;
11
12 public String toString(){
13 return "学号:" + Num + " 姓名:" + Name + " 班级:" + Cla;
14 }
15
16 public String getNum() {
17 return Num;
18 }
19
20 public String getName() {
21 return Name;
22 }
23
24 public String getCla() {
25 return Cla;
26 }
27
28 public void setNum(String num) {
29 Num = num;
30 }
31
32 public void setName(String name) {
33 Name = name;
34 }
35
36 public void setCla(String cla) {
37 Cla = cla;
38 }
39 }
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=".MainActivity"> 9 10 <LinearLayout 11 android:layout_width="match_parent" 12 android:layout_height="200dp" 13 android:gravity="center" 14 android:orientation="vertical"> 15 16 <LinearLayout 17 android:layout_width="match_parent" 18 android:layout_height="50dp" 19 android:gravity="center" 20 android:orientation="horizontal"> 21 22 <TextView 23 android:layout_width="50dp" 24 android:layout_height="40dp" 25 android:gravity="center" 26 android:text="学号:" /> 27 28 <EditText 29 android:id="@+id/et_number" 30 android:layout_width="150dp" 31 android:layout_height="40dp" /> 32 </LinearLayout> 33 34 <LinearLayout 35 android:layout_width="match_parent" 36 android:layout_height="50dp" 37 android:gravity="center" 38 android:orientation="horizontal"> 39 40 <TextView 41 android:layout_width="50dp" 42 android:layout_height="40dp" 43 android:gravity="center" 44 android:text="姓名:" /> 45 46 <EditText 47 android:id="@+id/et_name" 48 android:layout_width="150dp" 49 android:layout_height="40dp" /> 50 </LinearLayout> 51 52 <LinearLayout 53 android:layout_width="match_parent" 54 android:layout_height="50dp" 55 android:gravity="center" 56 android:orientation="horizontal"> 57 58 <TextView 59 android:layout_width="50dp" 60 android:layout_height="40dp" 61 android:gravity="center" 62 android:text="班级:" /> 63 64 <EditText 65 android:id="@+id/et_class" 66 android:layout_width="150dp" 67 android:layout_height="40dp" /> 68 </LinearLayout> 69 70 71 <Button 72 android:id="@+id/bt_add" 73 android:layout_width="180dp" 74 android:layout_height="40dp" 75 android:text="添加" /> 76 </LinearLayout> 77 78 <ListView 79 android:id="@+id/lv" 80 android:layout_width="match_parent" 81 android:layout_height="wrap_content" 82 android:longClickable="true" /> 83 84 </LinearLayout>
1 <?xml version="1.0" encoding="utf-8"?> 2 <menu xmlns:android="http://schemas.android.com/apk/res/android"> 3 <item 4 android:id="@+id/menu_del" 5 android:title="删除" /> 6 </menu>
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.example.flyuz.service5"> 4 5 <application 6 android:allowBackup="true" 7 android:icon="@mipmap/ic_launcher" 8 android:label="@string/app_name" 9 android:roundIcon="@mipmap/ic_launcher_round" 10 android:supportsRtl="true" 11 android:theme="@style/AppTheme"> 12 <activity android:name=".MainActivity"> 13 <intent-filter> 14 <action android:name="android.intent.action.MAIN" /> 15 16 <category android:name="android.intent.category.LAUNCHER" /> 17 </intent-filter> 18 </activity> 19 <service android:name=".chronometerService"/> 20 </application> 21 22 </manifest>
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.example.flyuz.sqlite6"> 4 5 <application 6 android:allowBackup="true" 7 android:icon="@mipmap/ic_launcher" 8 android:label="@string/app_name" 9 android:roundIcon="@mipmap/ic_launcher_round" 10 android:supportsRtl="true" 11 android:theme="@style/AppTheme"> 12 <activity android:name=".MainActivity"> 13 <intent-filter> 14 <action android:name="android.intent.action.MAIN" /> 15 16 <category android:name="android.intent.category.LAUNCHER" /> 17 </intent-filter> 18 </activity> 19 </application> 20 21 </manifest>
来源：https://www.cnblogs.com/flyuz/p/9904291.html