Add source code

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'kotlin-android-extensions'
+    id 'kotlin-kapt'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "pl.edu.pjwstk.s999844.shoppinglist"
+        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'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    buildFeatures {
+        viewBinding = true
+    }
+}
+
+dependencies {
+    implementation 'androidx.lifecycle:lifecycle-process:2.2.0'
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.3.3'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.3.3'
+    def room_version = "2.2.6"
+    implementation "androidx.room:room-runtime:$room_version"
+    kapt "androidx.room:room-compiler:$room_version"
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.3.2'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    testImplementation 'junit:junit:4.13.1'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+}

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

app/release/output-metadata.json

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+{
+  "version": 2,
+  "artifactType": {
+    "type": "APK",
+    "kind": "Directory"
+  },
+  "applicationId": "pl.edu.pjwstk.s999844.shoppinglist",
+  "variantName": "processReleaseResources",
+  "elements": [
+    {
+      "type": "SINGLE",
+      "filters": [],
+      "versionCode": 1,
+      "versionName": "1.0",
+      "outputFile": "app-release.apk"
+    }
+  ]
+}

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="pl.edu.pjwstk.s999844.shoppinglist">
+
+    <application
+        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/appName"
+        android:logo="@mipmap/ic_launcher"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.ShoppingList">
+        <activity
+            android:name=".AddItemActivity"
+            android:parentActivityName=".MainActivity" />
+        <activity
+            android:name=".OptionsActivity"
+            android:parentActivityName=".MainActivity" />
+        <activity
+            android:name=".MainActivity"
+            android:logo="@drawable/ic_trash"
+            android:theme="@style/Theme.ShoppingList.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/pl/edu/pjwstk/s999844/shoppinglist/AddItemActivity.kt

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+package pl.edu.pjwstk.s999844.shoppinglist
+
+import android.os.Bundle
+import android.view.View
+import android.view.inputmethod.InputMethodManager
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.snackbar.Snackbar
+import kotlinx.android.synthetic.main.activity_add_item.*
+import pl.edu.pjwstk.s999844.shoppinglist.dal.ShoppingListDao
+import pl.edu.pjwstk.s999844.shoppinglist.dal.ShoppingListDatabase
+import pl.edu.pjwstk.s999844.shoppinglist.models.RequiredItem
+
+
+class AddItemActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_add_item)
+    }
+
+    override fun onStart() {
+        super.onStart()
+
+        title = getString(R.string.addTitleBarText)
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    fun addItem(view: View) {
+        val name: String = addItemNameInput.text.toString().trim()
+        if (name.isEmpty()) {
+            warnError(getString(R.string.addNameIsEmptyMessage))
+            return
+        }
+
+        val amountString = addItemAmountInput.text.toString().trim()
+        val amount: Int = if (amountString.isEmpty() || amountString.isBlank()) {
+            1
+        } else {
+            try {
+                amountString.toInt()
+            } catch (e: NumberFormatException) {
+                warnError(getString(R.string.addAmountNotANumberMessage))
+                return
+            }
+        }
+
+        if (amount <= 0) {
+            warnError(getString(R.string.addAmountTooSmallMessage))
+            return
+        }
+
+        val shoppingListDao: ShoppingListDao =
+            ShoppingListDatabase.getInstance(applicationContext).getShoppingListDao();
+
+        if (shoppingListDao.findByNameLike(name).isNotEmpty()) {
+            warnError(getString(R.string.addItemAlreadyExistsMessage))
+            return
+        }
+
+        val item = RequiredItem(name, amount)
+        shoppingListDao.add(item)
+
+        finish()
+    }
+
+    private fun warnError(message: String) =
+        Snackbar.make(saveButton, message, Snackbar.LENGTH_SHORT).show()
+}

app/src/main/java/pl/edu/pjwstk/s999844/shoppinglist/MainActivity.kt

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+package pl.edu.pjwstk.s999844.shoppinglist
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
+import kotlinx.android.synthetic.main.activity_main.*
+import pl.edu.pjwstk.s999844.shoppinglist.dal.ShoppingListDao
+import pl.edu.pjwstk.s999844.shoppinglist.dal.ShoppingListDatabase
+import pl.edu.pjwstk.s999844.shoppinglist.models.RequiredItem
+import pl.edu.pjwstk.s999844.shoppinglist.recyclerviewadapters.ShoppingListAdapter
+import pl.edu.pjwstk.s999844.shoppinglist.settings.Settings
+
+
+class MainActivity : AppCompatActivity() {
+    private val settings: Settings by lazy { Settings(this) }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        initItemList()
+    }
+
+    private fun initItemList() {
+        mainListRecyclerView.layoutManager = LinearLayoutManager(this)
+        mainListRecyclerView.addItemDecoration(
+            DividerItemDecoration(
+                this,
+                DividerItemDecoration.VERTICAL
+            )
+        )
+
+        val shoppingListDao: ShoppingListDao =
+            ShoppingListDatabase.getInstance(applicationContext).getShoppingListDao();
+        shoppingListDao.findAllItems().observe(this, {
+            it.let {
+                (mainListRecyclerView.adapter as ShoppingListAdapter).setItems(it)
+                if (it.isEmpty()) {
+                    mainListRecyclerView.visibility = View.GONE
+                    mainEmptyTextView.visibility = View.VISIBLE
+                } else {
+                    mainListRecyclerView.visibility = View.VISIBLE
+                    mainEmptyTextView.visibility = View.GONE
+                }
+            }
+        })
+        mainListRecyclerView.adapter = ShoppingListAdapter { item, change ->
+            val dbItem: RequiredItem = shoppingListDao.findById(item.id)
+                ?: return@ShoppingListAdapter
+
+            val newAmount: Int = dbItem.amount + change
+            if (newAmount <= 0) {
+                shoppingListDao.delete(item)
+            } else {
+                item.amount = newAmount
+                shoppingListDao.update(item)
+            }
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_main, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.actionBarMenuOptionsEntry -> {
+                openActivity(OptionsActivity::class.java)
+                return true
+            }
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    fun onClickFloatingButton(view: View) = openActivity(AddItemActivity::class.java)
+
+    private fun <T : Activity> openActivity(clazz: Class<T>) =
+        startActivity(Intent(baseContext, clazz))
+
+    override fun onStart() {
+        super.onStart()
+
+        ThemeManager.set(settings.darkThemeActive)
+    }
+}

app/src/main/java/pl/edu/pjwstk/s999844/shoppinglist/OptionsActivity.kt

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+package pl.edu.pjwstk.s999844.shoppinglist
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.SwitchCompat
+import kotlinx.android.synthetic.main.activity_options.*
+import pl.edu.pjwstk.s999844.shoppinglist.settings.Settings
+
+
+class OptionsActivity : AppCompatActivity() {
+    private val settings: Settings by lazy { Settings(this) }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_options)
+    }
+
+    override fun onStart() {
+        super.onStart()
+
+        optionsThemeSwitch.isChecked = settings.darkThemeActive
+        optionsThemeSwitch.setOnClickListener {
+            it as SwitchCompat
+            onThemeSwitched(it.isChecked)
+        }
+
+        title = getString(R.string.optionsTitleBarText)
+    }
+
+    private fun onThemeSwitched(isDark: Boolean) {
+        settings.darkThemeActive = isDark
+        ThemeManager.set(isDark)
+    }
+}

app/src/main/java/pl/edu/pjwstk/s999844/shoppinglist/ThemeManager.kt

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+package pl.edu.pjwstk.s999844.shoppinglist
+
+import androidx.appcompat.app.AppCompatDelegate
+
+object ThemeManager {
+    fun set(dark: Boolean) {
+        AppCompatDelegate.setDefaultNightMode(if (dark) AppCompatDelegate.MODE_NIGHT_YES else AppCompatDelegate.MODE_NIGHT_NO)
+    }
+}

app/src/main/java/pl/edu/pjwstk/s999844/shoppinglist/dal/ShoppingListDao.kt

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+package pl.edu.pjwstk.s999844.shoppinglist.dal
+
+import androidx.lifecycle.LiveData
+import androidx.room.*
+import pl.edu.pjwstk.s999844.shoppinglist.models.RequiredItem
+
+@Dao
+interface ShoppingListDao {
+    @Query("SELECT * FROM RequiredItem")
+    fun findAllItems(): LiveData<List<RequiredItem>>
+
+    @Query("SELECT * FROM RequiredItem WHERE name LIKE :name")
+    fun findByNameLike(name: String): List<RequiredItem>
+
+    @Query("SELECT * FROM RequiredItem WHERE id LIKE :id")
+    fun findById(id: Long): RequiredItem?
+
+    @Insert
+    fun add(item: RequiredItem)
+
+    @Update
+    fun update(item: RequiredItem)
+
+    @Delete
+    fun delete(item: RequiredItem)
+}