Realm 이용한 Database 사용 예제

06 May 2019 | Android

프로젝트 build.gradle

buildscript {
    ext.kotlin_version = '1.3.31'
    repositories {
        google()
        jcenter()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "io.realm:realm-gradle-plugin:5.2.0"
    }
}

모듈 build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: 'realm-android'

...

dependencies {
    ...
    implementation 'io.realm:android-adapters:2.1.1'
}

SnowApplication.kt

import android.app.Application
import android.content.Context
import io.realm.Realm
import io.realm.RealmConfiguration

class SnowApplication : Application() {

    companion object {
        private var instance: SnowApplication? = null

        fun context(): Context {
            return instance!!.applicationContext
        }
    }

    init {
        instance = this
    }

    override fun onCreate() {
        super.onCreate()

        Realm.init(this)
        Realm.setDefaultConfiguration(getRealmConfig())
    }

    private fun getRealmConfig(): RealmConfiguration {
        return RealmConfiguration.Builder()
                .deleteRealmIfMigrationNeeded()
                .build()
    }
}

데이터 레코드 정의

open 키워드를 이용해서 상속을 가능하게 해야 하며, RealmObject()를 상속받아야 합니다.

import android.os.Parcel
import android.os.Parcelable
import io.realm.RealmObject
import io.realm.annotations.PrimaryKey

open class RewardDto(
        var habitId: Long = 0,
        var year: Int = 0, var month: Int = 0, var day: Int = 0,
        var percent: Int = 0, var stampType: Int = 0) : RealmObject()

open class HabitDto(
        @PrimaryKey var id: Long = 0,
        var name: String = "", var seq: Long = 0) : RealmObject()

데이터 생성, 조회, 수정, 삭제

import com.snowdeer.htracker.model.data.HabitDto
import io.realm.Realm
import io.realm.Sort
import io.realm.kotlin.createObject
import io.realm.kotlin.where

interface OnDatabaseEventListener {
    fun onDatabaseUpdated()
}

class HabitModelManager {

    companion object {
        val instance = HabitModelManager()
    }

    private constructor()

    private val realm = Realm.getDefaultInstance()

    private var onDatabaseEventListener: OnDatabaseEventListener? = null

    fun setOnDatabaseEventListener(l: OnDatabaseEventListener) {
        onDatabaseEventListener = l
    }

    fun notifyDatabaseUpdated() {
        onDatabaseEventListener?.onDatabaseUpdated()
    }

    private fun nextId(): Long {
        val maxId = realm.where<HabitDto>().max("id")
        if (maxId != null) {
            return maxId.toLong() + 1
        }
        return 0
    }

    private fun nextSeq(): Long {
        val maxSeq = realm.where<HabitDto>().max("seq")
        return maxSeq?.toLong()?.plus(1) ?: 0
    }


    fun getList(): ArrayList<HabitDto> {
        val realmResult = realm.where<HabitDto>()
                .findAll()
                .sort("seq", Sort.DESCENDING)

        val list = ArrayList<HabitDto>()
        for (item in realmResult) {
            list.add(item)
        }

        return list
    }

    fun create(name: String) {
        realm.beginTransaction()

        val item = realm.createObject<HabitDto>(nextId())

        item.name = name
        item.seq = nextSeq()

        realm.commitTransaction()

        notifyDatabaseUpdated()
    }

    fun update(id: Long, name: String, seq: Long) {
        realm.beginTransaction()

        val item = realm.where<HabitDto>().equalTo("id", id).findFirst()!!
        item.name = name
        item.seq = seq

        realm.commitTransaction()

        notifyDatabaseUpdated()
    }

    fun deleteWithReward(id: Long) {
        realm.beginTransaction()

        val item = realm.where<HabitDto>().equalTo("id", id).findFirst()!!
        item.deleteFromRealm()

        realm.commitTransaction()

        notifyDatabaseUpdated()
    }
}

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File에 텍스트(Text) 읽고 쓰기

04 May 2019 | Android

File에 텍스트 읽고 쓰는 예제

</pre class=”prettyprint”> import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileReader; import java.io.FileWriter;

public class FileUtil {

public synchronized static void writeTextToFile(String filepath, String text) { File file = new File(filepath); FileWriter fw = null; BufferedWriter bw = null;

try {
  fw = new FileWriter(file);
  bw = new BufferedWriter(fw);
  bw.write(text);
} catch (Exception e) {
  e.printStackTrace();
} finally {
  try {
    bw.close();
  } catch (Exception e) {
    e.printStackTrace();
  }

  try {
    fw.close();
  } catch (Exception e) {
    e.printStackTrace();
  }
}   }

public synchronized static String getTextFromFile(String filepath) { File file = new File(filepath);

StringBuilder sb = new StringBuilder();

try {
  BufferedReader br = new BufferedReader(new FileReader(file));
  String line;

  while ((line = br.readLine()) != null) {
    sb.append(line);
    sb.append('\n');
  }
  br.close();
} catch (Exception e) {
  e.printStackTrace();
}

return sb.toString();   } }

</pre>

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CollapsingToolbarLayout 예제

03 May 2019 | Android

styles.xml

</resources>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
  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=".MainActivity">

  <android.support.design.widget.AppBarLayout
    android:id="@+id/appBarLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.design.widget.CollapsingToolbarLayout
      android:id="@+id/collapsing_toolbar"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fitsSystemWindows="true"
      app:contentScrim="@color/colorPrimary"
      app:expandedTitleMarginEnd="0dp"
      app:expandedTitleMarginStart="0dp"
      app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed">

      <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="12dp"
        android:orientation="vertical"
        app:layout_collapseMode="parallax"
        app:layout_collapseParallaxMultiplier="0.7">

        <ImageView
          android:layout_width="64dp"
          android:layout_height="64dp"
          android:layout_gravity="center_horizontal"
          app:srcCompat="@drawable/ic_launcher"/>

        <TextView
          style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="center_horizontal"
          android:text="@string/app_name"/>

      </LinearLayout>

      <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:popupTheme="@style/SnowDeerTheme"
        android:title="@string/app_name"
        app:layout_collapseMode="parallax"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"/>

    </android.support.design.widget.CollapsingToolbarLayout>

    <RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content">

      <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:tabGravity="fill"
        app:tabMaxWidth="200dp"
        app:tabMode="scrollable"/>
    </RelativeLayout>
  </android.support.design.widget.AppBarLayout>

  <FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <android.support.v4.view.ViewPager
      android:id="@+id/viewpager"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>

  </FrameLayout>

</android.support.design.widget.CoordinatorLayout>

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Firebase 회원 가입, 로그인 예제

01 May 2019 | Android

회원 가입

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        create_userid_button.setOnClickListener {
            val email = email_input.text.toString()
            val password = password_input.text.toString()

            registerUser(email, password)
        }
    }

    private fun registerUser(email: String, password: String) {
        FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
            .addOnSuccessListener {
                val userId = FirebaseAuth.getInstance().currentUser
                Toast.makeText(applicationContext, "UserId(${userId?.email}) 생성 성공", Toast.LENGTH_SHORT).show()
            }
            .addOnFailureListener {
                it.printStackTrace()
                Toast.makeText(applicationContext, "UserId 생성 실패(${it.message})", Toast.LENGTH_SHORT).show()
            }
    }
}

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        login_button.setOnClickListener {
            val email = email_input.text.toString()
            val password = password_input.text.toString()

            login(email, password)
        }
    }

    private fun login(email: String, password: String) {
        FirebaseAuth.getInstance().signInWithEmailAndPassword(email, password)
            .addOnSuccessListener {
                val userId = FirebaseAuth.getInstance().currentUser
                Toast.makeText(applicationContext, "로그인 성공", Toast.LENGTH_SHORT).show()
            }
            .addOnFailureListener {
                it.printStackTrace()
                Toast.makeText(applicationContext, "로그인 실패(${it.message})", Toast.LENGTH_SHORT).show()
            }
    }
}

인증 메일 전송

인증 메일 양식은 Firebase Console에서 수정할 수 있습니다. 하지만 악용될 가능성이 있기 때문에 제목만 수정이 가능하며, 내요을 수정하지는 못합니다.

private fun verifyEmail() {
    val currentUser = FirebaseAuth.getInstance().currentUser
    currentUser?.let {
        it.sendEmailVerification()
            .addOnSuccessListener {
                Toast.makeText(applicationContext, "인증 메일을 전송했습니다.", Toast.LENGTH_SHORT).show()
            }
            .addOnFailureListener {
                it.printStackTrace()
                Toast.makeText(applicationContext, "인증 메일 전송 실패(${it.message})", Toast.LENGTH_SHORT).show()
            }
    }
}

Email 변경 및 패스워드 변경

Email 및 패스워드 변경은 다음 명령어를 이용해서 할 수 있습니다.

currentUser.updateEmail(newEmail: String)
currentUser.updatePassword(newPassword: String)

Comment Read more

Kotlin Firebase Google SignIn 예제

25 Apr 2019 | Android

build.gradle (프로젝트)

dependencies {
    classpath 'com.android.tools.build:gradle:3.4.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.google.gms:google-services:4.2.0'
}

build.gradle (모듈)

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.firebase:firebase-auth:16.0.5'
    implementation 'com.google.firebase:firebase-database:16.0.4'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.android.gms:play-services:12.0.1'
    implementation 'com.google.android.gms:play-services-auth:16.0.1'
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".MainActivity">

  <Button
    android:id="@+id/logout_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="logout"/>

</RelativeLayout>

activity_sign_in.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".MainActivity">

  <com.google.android.gms.common.SignInButton
    android:id="@+id/sign_in_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"/>

</RelativeLayout>

MainActivity.kt

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import com.google.android.gms.auth.api.Auth
import com.google.android.gms.common.ConnectionResult
import com.google.android.gms.common.api.GoogleApiClient
import com.google.firebase.auth.FirebaseAuth
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity(), GoogleApiClient.OnConnectionFailedListener {
    override fun onConnectionFailed(p0: ConnectionResult) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    lateinit var googleApiClient: GoogleApiClient

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        googleApiClient = GoogleApiClient.Builder(applicationContext)
                .enableAutoManage(this, this)
                .addApi(Auth.GOOGLE_SIGN_IN_API)
                .build()

        val currentUser = FirebaseAuth.getInstance().currentUser

        if (currentUser == null) {
            val intent = Intent(applicationContext, LoginActivity::class.java)
            startActivity(intent)
        } else {
            // TODO ...
        }

        logout_button.setOnClickListener {
            FirebaseAuth.getInstance().signOut()
            Auth.GoogleSignInApi.signOut(googleApiClient)

            val intent = Intent(applicationContext, LoginActivity::class.java)
            startActivity(intent)
        }
    }

    override fun onResume() {
        super.onResume()

        val currentUser = FirebaseAuth.getInstance().currentUser
        supportActionBar?.title = currentUser.toString()

    }
}

LoginActivity.kt

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import com.google.android.gms.auth.api.Auth
import com.google.android.gms.auth.api.signin.GoogleSignIn
import com.google.android.gms.auth.api.signin.GoogleSignInOptions
import com.google.android.gms.common.ConnectionResult
import com.google.android.gms.common.api.GoogleApiClient
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.GoogleAuthProvider
import kotlinx.android.synthetic.main.activity_login.*

class LoginActivity : AppCompatActivity(), GoogleApiClient.OnConnectionFailedListener {

    private val REQUEST_CODE_SIGN_IN = 1001

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)

        val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build()

        val googleSignInClient = GoogleSignIn.getClient(this, gso)

        login_button.setOnClickListener {
            val intent = googleSignInClient.signInIntent
            startActivityForResult(intent, REQUEST_CODE_SIGN_IN)
        }
    }

    override fun onConnectionFailed(result: ConnectionResult) {
        Toast.makeText(applicationContext, "연결 실패", Toast.LENGTH_SHORT).show()
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == REQUEST_CODE_SIGN_IN) {
            val result = Auth.GoogleSignInApi.getSignInResultFromIntent(data)
            if (result.isSuccess) {
                val account = result.signInAccount
                val credential = GoogleAuthProvider.getCredential(account?.idToken, null)
                FirebaseAuth.getInstance().signInWithCredential(credential)
                        .addOnSuccessListener {
                            Toast.makeText(applicationContext, "인증 성공", Toast.LENGTH_SHORT).show()
                            startActivity(Intent(applicationContext, MainActivity::class.java))
                            finish()
                        }
                        .addOnFailureListener {
                            Toast.makeText(applicationContext, "인증 실패(${it.message})", Toast.LENGTH_SHORT).show()
                        }
            } else {
                Toast.makeText(applicationContext, "로그인 실패", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

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Older Newer

snowdeer's Code Holic

Realm 이용한 Database 사용 예제

프로젝트 build.gradle

모듈 build.gradle

SnowApplication.kt

데이터 레코드 정의

데이터 생성, 조회, 수정, 삭제

File에 텍스트(Text) 읽고 쓰기

File에 텍스트 읽고 쓰는 예제

CollapsingToolbarLayout 예제

styles.xml

activity_main.xml

Firebase 회원 가입, 로그인 예제

회원 가입

로그인

인증 메일 전송

Email 변경 및 패스워드 변경

Kotlin Firebase Google SignIn 예제

build.gradle (프로젝트)

build.gradle (모듈)

activity_main.xml

activity_sign_in.xml

MainActivity.kt

LoginActivity.kt