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不懂Android Studio如何連接SQLite數據庫？？其實想解決這個問題也不難，下面讓小編帶著大家一起學習怎么去解決，希望大家閱讀完這篇文章后大所收獲。
1、先看一下項目目錄：
2、新建一個AS項目，創建如上圖所示的目錄結構，然后添加內容：
（1）修改添加布局文件：
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".LoginActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="歡迎進入登錄界面!"
android:textSize="30dp"
android:textStyle="bold" />
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="1" >
<TableRow>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="用戶名：" />
<EditText
android:id="@+id/username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="請輸入用戶名！！！" />
</TableRow>
<TableRow>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="密碼：" />
<EditText
android:id="@+id/password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="請輸入密碼！！！" />
</TableRow>
<TableRow>
<TextView />
<LinearLayout>
<Button
android:id="@+id/login"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="登錄" />
<Button
android:id="@+id/register"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="注冊" />
</LinearLayout>
</TableRow>
</TableLayout>
</LinearLayout>
</android.support.constraint.ConstraintLayout>activity_register.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".RegisterActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="歡迎進入注冊界面!"
android:textSize="30dp"
android:textStyle="bold" />
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1" >
<TableRow >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="用戶名：" />
<EditText
android:id="@+id/usernameRegister"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="請輸入用戶名！！！" />
</TableRow>
<TableRow >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="密碼：" />
<EditText
android:id="@+id/passwordRegister"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="請輸入密碼！！！" />
</TableRow>
<TableRow >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="年齡：" />
<EditText
android:id="@+id/ageRegister"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="請輸入年齡！！！" />
</TableRow>
<TableRow >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="性別："
android:textSize="20dp" />
<RadioGroup
android:id="@+id/sexRegister"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:checkedButton="@+id/woman"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/nan"
android:text="男"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />
<RadioButton
android:id="@id/woman"
android:text="女"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
</RadioGroup>
</TableRow>
<TableRow >
<TextView />
<LinearLayout >
<Button
android:id="@+id/Register"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="注冊" />
</LinearLayout>
</TableRow>
</TableLayout>
</LinearLayout>
</android.support.constraint.ConstraintLayout>（2）在service包DatabaseHelper中添加鏈接AS自帶數據庫以及創建表的語句：
package com.example.sqlitelogin.service;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
static String name="user.db";
static int dbVersion=1;
public DatabaseHelper(Context context) {
super(context, name, null, dbVersion);
}
public void onCreate(SQLiteDatabase db) {
String sql="create table user(id integer primary key autoincrement,username varchar(20),password varchar(20),age integer,sex varchar(2))";
db.execSQL(sql);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}（3）在service包UserService中用sql語句寫登錄注冊功能的實現：
package com.example.sqlitelogin.service;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.example.sqlitelogin.User;
public class UserService {
private DatabaseHelper dbHelper;
public UserService(Context context){
dbHelper=new DatabaseHelper(context);
}
public boolean login(String username,String password){
SQLiteDatabase sdb=dbHelper.getReadableDatabase();
String sql="select * from user where username=? and password=?";
Cursor cursor=sdb.rawQuery(sql, new String[]{username,password});
if(cursor.moveToFirst()==true){
cursor.close();
return true;
}
return false;
}
public boolean register(User user){
SQLiteDatabase sdb=dbHelper.getReadableDatabase();
String sql="insert into user(username,password,age,sex) values(?,?,?,?)";
Object obj[]={user.getUsername(),user.getPassword(),user.getAge(),user.getSex()};
sdb.execSQL(sql, obj);
return true;
}
}（4）在User文件中聲明要用到的表列名的變量，并對其添加get&&set方法：
package com.example.sqlitelogin;
import java.io.Serializable;
public class User implements Serializable{
private int id;
private String username;
private String password;
private int age;
private String sex;
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(String username, String password, int age, String sex) {
super();
this.username = username;
this.password = password;
this.age = age;
this.sex = sex;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password="
+ password + ", age=" + age + ", sex=" + sex + "]";
}
}（5）為注冊功能添加activity組件：
package com.example.sqlitelogin;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import com.example.sqlitelogin.service.UserService;
public class RegisterActivity extends AppCompatActivity {
EditText username;
EditText password;
EditText age;
RadioGroup sex;
Button register;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
findViews();
register.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String name=username.getText().toString().trim();
String pass=password.getText().toString().trim();
String agestr=age.getText().toString().trim();
String sexstr=((RadioButton)RegisterActivity.this.findViewById(sex.getCheckedRadioButtonId())).getText().toString();
Log.i("TAG",name+"_"+pass+"_"+agestr+"_"+sexstr);
UserService uService=new UserService(RegisterActivity.this);
User user=new User();
user.setUsername(name);
user.setPassword(pass);
user.setAge(Integer.parseInt(agestr));
user.setSex(sexstr);
uService.register(user);
Toast.makeText(RegisterActivity.this, "注冊成功", Toast.LENGTH_LONG).show();
}
});
}
private void findViews() {
username=(EditText) findViewById(R.id.usernameRegister);
password=(EditText) findViewById(R.id.passwordRegister);
age=(EditText) findViewById(R.id.ageRegister);
sex=(RadioGroup) findViewById(R.id.sexRegister);
register=(Button) findViewById(R.id.Register);
}
}（6）為登錄功能添加activity組件：
package com.example.sqlitelogin;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.sqlitelogin.service.UserService;
public class LoginActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);//即activity_login.xml
findViews();
}
private EditText username;
private EditText password;
private Button login;
private Button register;
private void findViews() {
username=(EditText) findViewById(R.id.username);
password=(EditText) findViewById(R.id.password);
login=(Button) findViewById(R.id.login);
register=(Button) findViewById(R.id.register);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name=username.getText().toString();
System.out.println(name);
String pass=password.getText().toString();
System.out.println(pass);
Log.i("TAG",name+"_"+pass);
UserService uService=new UserService(LoginActivity.this);
boolean flag=uService.login(name, pass);
if(flag){
Log.i("TAG","登錄成功");
Toast.makeText(LoginActivity.this, "登錄成功", Toast.LENGTH_LONG).show();
Intent intent = new Intent(LoginActivity.this,RegisterActivity.class);
startActivity(intent);
}else{
Log.i("TAG","登錄失敗");
Toast.makeText(LoginActivity.this, "登錄失敗", Toast.LENGTH_LONG).show();
}
}
});
register.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent=new Intent(LoginActivity.this,RegisterActivity.class);
startActivity(intent);
}
});
}
}3、Androidmanifest.xml清單文件中，程序運行必備的內容一般都已經自動完成添加了。也可以進行修改：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sqlitelogin">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".RegisterActivity">
<!--<intent-filter>-->
<!--<action android:name="android.intent.action.MAIN" />-->
<!--<category android:name="android.intent.category.LAUNCHER" />-->
<!--</intent-filter>-->
</activity>
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<!--<uses-library android:name="android.test.runner"/>-->
</application>
</manifest>4、在模擬器或者真機運行程序，即可！一個連接數據庫的登錄注冊功能已經實現，效果如下：
感謝你能夠認真閱讀完這篇文章，希望小編分享Android Studio如何連接SQLite數據庫？內容對大家有幫助，同時也希望大家多多支持億速云，關注億速云行業資訊頻道，遇到問題就找億速云，詳細的解決方法等著你來學習!
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