Initial commit

.gitignore

+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

.idea/codeStyles/Project.xml

+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file

.idea/codeStyles/codeStyleConfig.xml

+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>
\ No newline at end of file

.idea/gradle.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="PLATFORM" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="1.8" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+        <option name="resolveModulePerSourceSet" value="false" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file

.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="BintrayJCenter" />
+      <option name="name" value="BintrayJCenter" />
+      <option name="url" value="https://jcenter.bintray.com/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="Google" />
+      <option name="name" value="Google" />
+      <option name="url" value="https://dl.google.com/dl/android/maven2/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>
\ No newline at end of file

.idea/runConfigurations.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
+        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file

app/.gitignore

+/build
\ No newline at end of file

app/build.gradle

+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "com.example.room"
+        minSdkVersion 16
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    packagingOptions {
+        exclude 'META-INF/atomicfu.kotlin_module'
+    }
+
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+
+    compileOptions {
+        sourceCompatibility 1.8
+        targetCompatibility 1.8
+    }
+}
+
+dependencies {
+    implementation "androidx.appcompat:appcompat:$rootProject.appCompatVersion"
+    implementation "androidx.activity:activity-ktx:$rootProject.activityVersion"
+
+    // Dependencies for working with Architecture components
+    // You'll probably have to update the version numbers in build.gradle (Project)
+
+    // Room components
+    implementation "androidx.room:room-ktx:$rootProject.roomVersion"
+    kapt "androidx.room:room-compiler:$rootProject.roomVersion"
+    androidTestImplementation "androidx.room:room-testing:$rootProject.roomVersion"
+
+    // Lifecycle components
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$rootProject.lifecycleVersion"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$rootProject.lifecycleVersion"
+    implementation "androidx.lifecycle:lifecycle-common-java8:$rootProject.lifecycleVersion"
+
+    // Kotlin components
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-core:$rootProject.coroutines"
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-android:$rootProject.coroutines"
+
+    // UI
+    implementation "androidx.constraintlayout:constraintlayout:$rootProject.constraintLayoutVersion"
+    implementation "com.google.android.material:material:$rootProject.materialVersion"
+
+    // Testing
+    testImplementation "junit:junit:$rootProject.junitVersion"
+    androidTestImplementation "androidx.arch.core:core-testing:$rootProject.coreTestingVersion"
+    androidTestImplementation ("androidx.test.espresso:espresso-core:$rootProject.espressoVersion", {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    androidTestImplementation "androidx.test.ext:junit:$rootProject.androidxJunitVersion"
+}
\ No newline at end of file

app/proguard-rules.pro

+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file

app/src/androidTest/java/com/example/room/ExampleInstrumentedTest.kt

+package com.example.room
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.room", appContext.packageName)
+    }
+}
\ No newline at end of file

app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.room">
+
+    <application
+        android:name=".WordsApplication"
+        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=".NewWordActivity"></activity>
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file

app/src/main/java/com/example/room/MainActivity.kt

+package com.example.room
+
+import android.app.Activity
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.widget.Toast
+import androidx.activity.viewModels
+import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val recyclerView = findViewById<RecyclerView>(R.id.recyclerview)
+        val adapter = WordListAdapter()
+        recyclerView.adapter = adapter
+        recyclerView.layoutManager = LinearLayoutManager(this)
+
+        wordViewModel.allWords.observe(this, Observer { words -> words?.let { adapter.submitList(it) } })
+
+        val fab = findViewById<FloatingActionButton>(R.id.fab)
+        fab.setOnClickListener {
+            val intent = Intent(this@MainActivity, NewWordActivity::class.java)
+            startActivityForResult(intent, newWordActivityRequestCode)
+        }
+    }
+
+    private val newWordActivityRequestCode = 1
+    private val wordViewModel: WordViewModel by viewModels { WordViewModelFactory((application as WordsApplication).repository) }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if (requestCode == newWordActivityRequestCode && resultCode == Activity.RESULT_OK) {
+            data?.getStringExtra(NewWordActivity.EXTRA_REPLY)?.let {
+                val word = Word(it)
+                wordViewModel.insert(word)
+            }
+        } else {
+            Toast.makeText(
+                applicationContext,
+                R.string.empty_not_saved,
+                Toast.LENGTH_LONG).show()
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/room/NewWordActivity.kt

+package com.example.room
+
+import android.app.Activity
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.text.TextUtils
+import android.widget.Button
+import android.widget.EditText
+
+class NewWordActivity : AppCompatActivity() {
+    private lateinit var editWordView: EditText
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_new_word)
+        editWordView = findViewById(R.id.edit_word)
+
+        val button = findViewById<Button>(R.id.button_save)
+        button.setOnClickListener {
+            val replyIntent = Intent()
+            if (TextUtils.isEmpty(editWordView.text)) {
+                setResult(Activity.RESULT_CANCELED, replyIntent)
+            } else {
+                val word = editWordView.text.toString()
+                replyIntent.putExtra(EXTRA_REPLY, word)
+                setResult(Activity.RESULT_OK, replyIntent)
+            }
+            finish()
+        }
+    }
+
+    companion object { const val EXTRA_REPLY = "com.example.android.wordlistsql.REPLY" }
+}

app/src/main/java/com/example/room/Word.kt

+package com.example.room
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+/*@Entity(tableName = "word_table")
+class Word(@PrimaryKey(autoGenerate = true) val id: Int, @ColumnInfo(name = "word") val word: String)*/
+@Entity(tableName = "word_table")
+data class Word(@PrimaryKey @ColumnInfo(name = "word") val word: String)

app/src/main/java/com/example/room/WordDao.kt

+package com.example.room
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface WordDao {
+    @Query("SELECT * FROM word_table ORDER BY word ASC")
+    fun getAlphabetizedWords(): Flow<List<Word>>
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun insert(word: Word)
+    @Query("DELETE FROM word_table")
+    suspend fun deleteAll()
+}

app/src/main/java/com/example/room/WordListAdapter.kt

+package com.example.room
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+
+class WordListAdapter : ListAdapter<Word, WordListAdapter.WordViewHolder>(WordsComparator()) {
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WordViewHolder {
+        return WordViewHolder.create(parent)
+    }
+    override fun onBindViewHolder(holder: WordViewHolder, position: Int) {
+        val current = getItem(position)
+        holder.bind(current.word)
+    }
+
+    class WordViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val wordItemView: TextView = itemView.findViewById(R.id.textView)
+        fun bind(text: String?) {
+            wordItemView.text = text
+        }
+        companion object {
+            fun create(parent: ViewGroup): WordViewHolder {
+                val view: View = LayoutInflater.from(parent.context)
+                    .inflate(R.layout.recyclerview_item, parent, false)
+                return WordViewHolder(view)
+            }
+        }
+    }
+
+    class WordsComparator : DiffUtil.ItemCallback<Word>() {
+        override fun areItemsTheSame(oldItem: Word, newItem: Word): Boolean {
+            return oldItem === newItem
+        }
+        override fun areContentsTheSame(oldItem: Word, newItem: Word): Boolean {
+            return oldItem.word == newItem.word
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/room/WordRepository.kt

+package com.example.room
+
+import androidx.annotation.WorkerThread
+import kotlinx.coroutines.flow.Flow
+
+class WordRepository(private val wordDao: WordDao) {
+    val allWords: Flow<List<Word>> = wordDao.getAlphabetizedWords()
+    @Suppress("RedundantSuspendModifier")
+    @WorkerThread
+    suspend fun insert(word: Word) {
+        wordDao.insert(word)
+    }
+}
\ No newline at end of file

app/src/main/java/com/example/room/WordRoomDatabase.kt

+package com.example.room
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import androidx.sqlite.db.SupportSQLiteDatabase
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+@Database(entities = arrayOf(Word::class), version = 1, exportSchema = false)
+public abstract class WordRoomDatabase : RoomDatabase() {
+    abstract fun wordDao(): WordDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: WordRoomDatabase? = null
+        fun getDatabase(context: Context, scope: CoroutineScope): WordRoomDatabase {
+            // if the INSTANCE is not null, then return it,
+            // if it is, then create the database
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    WordRoomDatabase::class.java,
+                    "word_database"
+                ).addCallback(WordDatabaseCallback(scope)).build()
+                INSTANCE = instance
+                // return instance
+                instance
+            }
+        }
+    }
+
+    private class WordDatabaseCallback(private val scope: CoroutineScope) : RoomDatabase.Callback() {
+        override fun onCreate(db: SupportSQLiteDatabase) {
+            super.onCreate(db)
+            INSTANCE?.let { database -> scope.launch {
+                    populateDatabase(database.wordDao())
+                }
+            }
+        }
+        suspend fun populateDatabase(wordDao: WordDao) {
+            // Delete all content here.
+            wordDao.deleteAll()
+            // Add sample words.
+            var word = Word("Hello")
+            wordDao.insert(word)
+            word = Word("World!")
+            wordDao.insert(word)
+            // TODO: Add your own words!
+            word = Word("Some Word!")
+            wordDao.insert(word)
+        }
+    }
+}
+

app/src/main/java/com/example/room/WordViewModel.kt

+package com.example.room
+
+import androidx.lifecycle.*
+import kotlinx.coroutines.launch
+
+class WordViewModel(private val repository: WordRepository) : ViewModel() {
+    val allWords: LiveData<List<Word>> = repository.allWords.asLiveData()
+    fun insert(word: Word) = viewModelScope.launch {
+        repository.insert(word)
+    }
+}
+
+class WordViewModelFactory(private val repository: WordRepository) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(WordViewModel::class.java)) {
+            @Suppress("UNCHECKED_CAST")
+            return WordViewModel(repository) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}
\ No newline at end of file