Notes App by Sudip

Notes App/Notes App/.gitignore

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+*.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
+local.properties

Notes App/Notes App/app/.gitignore

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+/build

Notes App/Notes App/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'kotlin-kapt'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.0"
+
+    defaultConfig {
+        applicationId "com.example.coroutineslesson"
+        minSdkVersion 24
+        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'
+        }
+        buildFeatures {
+            dataBinding true
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.5.21"
+    implementation 'androidx.core:core-ktx:1.6.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+    implementation 'androidx.room:room-runtime:2.3.0'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    // ViewModel
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1")
+    // LiveData
+    implementation("androidx.lifecycle:lifecycle-livedata-ktx:2.3.1")
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0")
+    implementation 'androidx.room:room-ktx:2.3.0'
+    kapt 'androidx.room:room-compiler:2.3.0'
+}

Notes App/Notes App/app/proguard-rules.pro

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+# 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

Notes App/Notes App/app/src/androidTest/java/com/example/notesapp/ExampleInstrumentedTest.kt

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+package com.example.notesapp
+
+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.notesapp", appContext.packageName)
+    }
+}

Notes App/Notes App/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.notesapp">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/notes"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.NotesApp">
+        <activity
+            android:name=".SlashScreenActivity"
+            android:configChanges="orientation|keyboardHidden|screenSize"
+            >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name=".MainActivity">
+        </activity>
+
+        <meta-data
+            android:name="preloaded_fonts"
+            android:resource="@array/preloaded_fonts" />
+    </application>
+
+</manifest>

Notes App/Notes App/app/src/main/java/com/example/notesapp/Event.kt

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+package com.example.notesapp
+
+/**
+ * Used as a wrapper for data that is exposed via a LiveData that represents an event.
+ */
+open class Event<out T>(private val content: T) {
+
+    var hasBeenHandled = false
+        private set // Allow external read but not write
+
+    /**
+     * Returns the content and prevents its use again.
+     */
+    fun getContentIfNotHandled(): T? {
+        return if (hasBeenHandled) {
+            null
+        } else {
+            hasBeenHandled = true
+            content
+        }
+    }
+
+    /**
+     * Returns the content, even if it's already been handled.
+     */
+    fun peekContent(): T = content
+}

Notes App/Notes App/app/src/main/java/com/example/notesapp/MainActivity.kt

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+package com.example.notesapp
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.util.Log
+import android.widget.Toast
+import androidx.databinding.DataBindingUtil
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProvider
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.notesapp.databinding.ActivityMainBinding
+
+class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+    lateinit var notesViewModel: NotesViewModel
+    lateinit var adapter: NotesRecyclerViewAdapter
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = DataBindingUtil.setContentView(this,R.layout.activity_main)
+        val notesDAO = NotesDatabase.getInstance(this).notesDAO
+        val repository = NotesRepository(notesDAO)
+        val factory = NotesViewModelFactory(repository)
+        notesViewModel = ViewModelProvider(this,factory)[NotesViewModel :: class.java]
+        binding.viewModel = notesViewModel
+        binding.lifecycleOwner = this
+        recyclerViewInit()
+        notesViewModel.message.observe(this, Observer {
+            it.getContentIfNotHandled()?.let {
+                Toast.makeText(this,it,Toast.LENGTH_SHORT).show()
+            }
+        })
+    }
+    private fun recyclerViewInit() {
+        binding.recyclerView.layoutManager = LinearLayoutManager(this)
+        adapter = NotesRecyclerViewAdapter(this,
+            {selectedItem : NotesEntity -> listItemClicked(selectedItem)})
+        binding.recyclerView.adapter = adapter
+        displayNotesList()
+
+    }
+    private fun displayNotesList() {
+        notesViewModel.notes.observe(this, Observer {
+            Log.i("MyTag",it.toString() )
+            adapter.setList(it)
+            adapter.notifyDataSetChanged()
+        })
+    }
+    private fun listItemClicked(notesEntity: NotesEntity) {
+//        Toast.makeText(this,"Selected name is ${notesEntity.name}",Toast.LENGTH_SHORT).show()
+        notesViewModel.initUpdateOrDelete(notesEntity)
+    }
+}

Notes App/Notes App/app/src/main/java/com/example/notesapp/NotesDAO.kt

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+package com.example.notesapp
+
+import androidx.lifecycle.LiveData
+import androidx.room.*
+
+@Dao
+interface NotesDAO  {
+
+    @Insert
+    suspend fun insertNotesDAO(notesEntity : NotesEntity) : Long
+
+    @Update
+    suspend fun updateNotesDAO(notesEntity : NotesEntity) :Int
+
+    @Delete
+    suspend fun deleteNotesDAO(notesEntity : NotesEntity):Int
+
+    @Query("DELETE FROM NOTES")
+    suspend fun deleteAll(): Int
+
+    @Query("SELECT * FROM notes")
+    fun getAllNotes() : LiveData<List<NotesEntity>>
+
+}

Notes App/Notes App/app/src/main/java/com/example/notesapp/NotesDatabase.kt

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+package com.example.notesapp
+
+import android.content.Context
+import androidx.room.*
+
+@Database(entities = [NotesEntity::class],version = 2)
+abstract class NotesDatabase : RoomDatabase() {
+
+    abstract val notesDAO : NotesDAO
+
+    companion object {
+        @Volatile
+        private var notesDatabaseInstance : NotesDatabase? = null
+        fun getInstance(context: Context) : NotesDatabase {
+            if (notesDatabaseInstance == null) {
+                synchronized(this) {
+                    notesDatabaseInstance = Room.databaseBuilder(
+                                                    context,
+                                                    NotesDatabase :: class.java,
+                                                    "notesDatabase").build()
+                }
+            }
+            return notesDatabaseInstance!!
+        }
+
+
+    }
+}