lab6

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

@@ -0,0 +1,25 @@
+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

@@ -1,57 +1,52 @@
 package com.example.myapplication
 
-import android.Manifest
-import android.content.pm.PackageManager
-import android.graphics.Bitmap
 import android.os.Bundle
 import android.widget.Button
-import android.widget.ImageView
-import android.widget.Toast
+import android.widget.EditText
 import androidx.activity.ComponentActivity
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.core.content.ContextCompat
+import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import kotlinx.coroutines.launch
 
 class MainActivity : ComponentActivity() {
 
-    private lateinit var btnCamera: Button
-    private lateinit var imageView: ImageView
+    private lateinit var etInput: EditText
+    private lateinit var btnAdd: Button
+    private lateinit var recyclerView: RecyclerView
+    private lateinit var adapter: NoteAdapter
 
-    // Новый контракт
-    private val takePicturePreview = registerForActivityResult(
-        ActivityResultContracts.TakePicturePreview()
-    ) { bitmap: Bitmap? ->
-        if (bitmap != null) {
-            imageView.setImageBitmap(bitmap)
-        } else {
-            Toast.makeText(this, "Фото не получено", Toast.LENGTH_SHORT).show()
-        }
-    }
-
-    // Запрос разрешения на камеру
-    private val requestCameraPermission = registerForActivityResult(
-        ActivityResultContracts.RequestPermission()
-    ) { granted ->
-        if (granted) {
-            takePicturePreview.launch(null)
-        } else {
-            Toast.makeText(this, "Разрешение на камеру не выдано", Toast.LENGTH_SHORT).show()
-        }
-    }
+    private lateinit var db: AppDatabase
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        btnCamera = findViewById(R.id.btnCamera)
-        imageView = findViewById(R.id.imageView)
+        etInput = findViewById(R.id.etInput)
+        btnAdd = findViewById(R.id.btnAdd)
+        recyclerView = findViewById(R.id.recyclerView)
 
-        btnCamera.setOnClickListener {
-            if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
-                == PackageManager.PERMISSION_GRANTED
-            ) {
-                takePicturePreview.launch(null)
-            } else {
-                requestCameraPermission.launch(Manifest.permission.CAMERA)
+        adapter = NoteAdapter(emptyList())
+        recyclerView.layoutManager = LinearLayoutManager(this)
+        recyclerView.adapter = adapter
+
+        db = AppDatabase.getDatabase(this)
+
+        // Добавляем заметку
+        btnAdd.setOnClickListener {
+            val text = etInput.text.toString()
+            if (text.isNotEmpty()) {
+                lifecycleScope.launch {
+                    db.noteDao().insert(NoteEntity(text = text))
+                }
+                etInput.text.clear()
+            }
+        }
+
+        // Подписываемся на изменения
+        lifecycleScope.launch {
+            db.noteDao().getAll().collect { notes ->
+                adapter.update(notes)
             }
         }
     }

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

@@ -0,0 +1,10 @@
+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

@@ -0,0 +1,29 @@
+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

@@ -0,0 +1,15 @@
+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>>
+}