lab7

app/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
-    id("org.jetbrains.kotlin.kapt")
+    id("com.google.gms.google-services")
 }
 
 android {
@@ -47,9 +47,6 @@ dependencies {
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
 
-    // Room
-    val room_version = "2.8.0"
-    implementation("androidx.room:room-runtime:$room_version")
-    kapt("androidx.room:room-compiler:$room_version")
-    implementation("androidx.room:room-ktx:$room_version")
+    implementation(platform("com.google.firebase:firebase-bom:34.3.0"))
+    implementation("com.google.firebase:firebase-database")
 }

app/src/main/java/com/example/myapplication/AppDatabase.kt

@@ -1,25 +0,0 @@
-package com.example.myapplication
-
-import androidx.room.Database
-import androidx.room.Room
-import androidx.room.RoomDatabase
-import android.content.Context
-
-@Database(entities = [NoteEntity::class], version = 1)
-abstract class AppDatabase : RoomDatabase() {
-    abstract fun noteDao(): NoteDao
-
-    companion object {
-        @Volatile private var INSTANCE: AppDatabase? = null
-
-        fun getDatabase(context: Context): AppDatabase {
-            return INSTANCE ?: synchronized(this) {
-                Room.databaseBuilder(
-                    context.applicationContext,
-                    AppDatabase::class.java,
-                    "my_database"
-                ).build().also { INSTANCE = it }
-            }
-        }
-    }
-}

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

@@ -3,50 +3,47 @@ package com.example.myapplication
 import android.os.Bundle
 import android.widget.Button
 import android.widget.EditText
+import android.widget.TextView
+import android.widget.Toast
 import androidx.activity.ComponentActivity
-import androidx.lifecycle.lifecycleScope
-import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
-import kotlinx.coroutines.launch
+import com.google.firebase.database.FirebaseDatabase
 
 class MainActivity : ComponentActivity() {
 
     private lateinit var etInput: EditText
-    private lateinit var btnAdd: Button
-    private lateinit var recyclerView: RecyclerView
-    private lateinit var adapter: NoteAdapter
+    private lateinit var btnSave: Button
+    private lateinit var btnLoad: Button
+    private lateinit var tvResult: TextView
 
-    private lateinit var db: AppDatabase
+    private val db = FirebaseDatabase.getInstance().reference
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
         etInput = findViewById(R.id.etInput)
-        btnAdd = findViewById(R.id.btnAdd)
-        recyclerView = findViewById(R.id.recyclerView)
+        btnSave = findViewById(R.id.btnSave)
+        btnLoad = findViewById(R.id.btnLoad)
+        tvResult = findViewById(R.id.tvResult)
 
-        adapter = NoteAdapter(emptyList())
-        recyclerView.layoutManager = LinearLayoutManager(this)
-        recyclerView.adapter = adapter
-
-        db = AppDatabase.getDatabase(this)
-
-        // Добавляем заметку
-        btnAdd.setOnClickListener {
+        // Сохранение данных
+        btnSave.setOnClickListener {
             val text = etInput.text.toString()
             if (text.isNotEmpty()) {
-                lifecycleScope.launch {
-                    db.noteDao().insert(NoteEntity(text = text))
-                }
+                val noteId = db.push().key!!    // генерируем уникальный id
+                db.child("notes").child(noteId).setValue(text)
+                Toast.makeText(this, "Сохранено", Toast.LENGTH_SHORT).show()
                 etInput.text.clear()
             }
         }
 
-        // Подписываемся на изменения
-        lifecycleScope.launch {
-            db.noteDao().getAll().collect { notes ->
-                adapter.update(notes)
+        // Загрузка данных
+        btnLoad.setOnClickListener {
+            db.child("notes").get().addOnSuccessListener { snapshot ->
+                val list = snapshot.children.mapNotNull { it.getValue(String::class.java) }
+                tvResult.text = list.joinToString("\n")
+            }.addOnFailureListener {
+                Toast.makeText(this, "Ошибка загрузки", Toast.LENGTH_SHORT).show()
             }
         }
     }

app/src/main/java/com/example/myapplication/Note.kt

@@ -1,10 +0,0 @@
-package com.example.myapplication
-
-import androidx.room.Entity
-import androidx.room.PrimaryKey
-
-@Entity(tableName = "notes")
-data class NoteEntity(
-    @PrimaryKey(autoGenerate = true) val id: Int = 0,
-    val text: String
-)

app/src/main/java/com/example/myapplication/NoteAdapter.kt

@@ -1,29 +0,0 @@
-package com.example.myapplication
-
-import android.view.LayoutInflater
-import android.view.ViewGroup
-import android.widget.TextView
-import androidx.recyclerview.widget.RecyclerView
-
-class NoteAdapter(private var notes: List<NoteEntity>) :
-    RecyclerView.Adapter<NoteAdapter.NoteViewHolder>() {
-
-    class NoteViewHolder(val textView: TextView) : RecyclerView.ViewHolder(textView)
-
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NoteViewHolder {
-        val textView = LayoutInflater.from(parent.context)
-            .inflate(android.R.layout.simple_list_item_1, parent, false) as TextView
-        return NoteViewHolder(textView)
-    }
-
-    override fun onBindViewHolder(holder: NoteViewHolder, position: Int) {
-        holder.textView.text = notes[position].text
-    }
-
-    override fun getItemCount() = notes.size
-
-    fun update(newNotes: List<NoteEntity>) {
-        notes = newNotes
-        notifyDataSetChanged()
-    }
-}

app/src/main/java/com/example/myapplication/NoteDao.kt

@@ -1,15 +0,0 @@
-package com.example.myapplication
-
-import androidx.room.Dao
-import androidx.room.Insert
-import androidx.room.Query
-import kotlinx.coroutines.flow.Flow
-
-@Dao
-interface NoteDao {
-    @Insert
-    suspend fun insert(note: NoteEntity)
-
-    @Query("SELECT * FROM notes")
-    fun getAll(): Flow<List<NoteEntity>>
-}

app/src/main/res/layout/activity_main.xml

@@ -8,19 +8,34 @@
         android:id="@+id/etInput"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:hint="Введите заметку" />
+        android:hint="Введите текст" />
 
-    <Button
-        android:id="@+id/btnAdd"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:text="Добавить" />
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recyclerView"
+    <LinearLayout
         android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_marginTop="16dp"
-        android:layout_weight="1" />
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:layout_marginTop="16dp">
+
+        <Button
+            android:id="@+id/btnSave"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Сохранить" />
+
+        <Button
+            android:id="@+id/btnLoad"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Загрузить" />
+    </LinearLayout>
+
+    <TextView
+        android:id="@+id/tvResult"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="24dp"
+        android:text="Здесь появятся данные"
+        android:textSize="18sp" />
 </LinearLayout>