lab4

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

@@ -1,53 +1,55 @@
 package com.example.myapplication
 
-import android.net.ConnectivityManager
-import android.net.Network
-import android.net.NetworkCapabilities
 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.core.content.getSystemService
+import java.io.File
 
 class MainActivity : ComponentActivity() {
 
-    private lateinit var tvStatus: TextView
+    private lateinit var etInput: EditText
-    private lateinit var connectivityManager: ConnectivityManager
+    private lateinit var btnSave: Button
+    private lateinit var btnLoad: Button
+    private lateinit var tvResult: TextView
+
+    private val fileName = "myfile.txt"
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        tvStatus = findViewById(R.id.tvNetworkStatus)
+        etInput = findViewById(R.id.etInput)
-        connectivityManager = getSystemService()!!
+        btnSave = findViewById(R.id.btnSave)
+        btnLoad = findViewById(R.id.btnLoad)
+        tvResult = findViewById(R.id.tvResult)
 
-        // Проверяем сеть при старте
+        btnSave.setOnClickListener { saveToFile() }
-        updateNetworkStatus()
+        btnLoad.setOnClickListener { loadFromFile() }
-
-        // Подписываемся на изменения сети
-        connectivityManager.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {
-            override fun onAvailable(network: Network) {
-                runOnUiThread {
-                    tvStatus.text = "Сеть доступна"
-                    Toast.makeText(this@MainActivity, "Подключение появилось", Toast.LENGTH_SHORT).show()
-                }
-            }
-
-            override fun onLost(network: Network) {
-                runOnUiThread {
-                    tvStatus.text = "Сеть недоступна"
-                    Toast.makeText(this@MainActivity, "Подключение потеряно", Toast.LENGTH_SHORT).show()
-                }
-            }
-        })
     }
 
-    // Проверка текущего состояния сети
+    private fun saveToFile() {
-    private fun updateNetworkStatus() {
+        val text = etInput.text.toString()
-        val network = connectivityManager.activeNetwork
+        if (text.isEmpty()) {
-        val caps = connectivityManager.getNetworkCapabilities(network)
+            Toast.makeText(this, "Введите текст", Toast.LENGTH_SHORT).show()
-        val connected = caps?.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) == true
+            return
+        }
 
-        tvStatus.text = if (connected) "Сеть доступна" else "Сеть недоступна"
+        val file = File(filesDir, fileName)
+        file.writeText(text)
+
+        Toast.makeText(this, "Файл сохранён", Toast.LENGTH_SHORT).show()
+    }
+
+    private fun loadFromFile() {
+        val file = File(filesDir, fileName)
+        if (file.exists()) {
+            val content = file.readText()
+            tvResult.text = "Содержимое файла: $content"
+        } else {
+            tvResult.text = "Файл не найден"
+        }
     }
 }

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

@@ -4,10 +4,39 @@
     android:orientation="vertical"
     android:padding="16dp">
 
-    <TextView
+    <EditText
-        android:id="@+id/tvNetworkStatus"
+        android:id="@+id/etInput"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Проверка сети..."
+        android:hint="Введите текст"
+        android:inputType="text" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        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 появится содержимое файла"
         android:textSize="18sp" />
 </LinearLayout>