6. MainActivity.Java

package com.example.laba13_2; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private Button btnTask1, btnTask2, btnTask3, btnTask4; private TextView tvStudentInfo; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Инициализация элементов tvStudentInfo = findViewById(R.id.tvStudentInfo); btnTask1 = findViewById(R.id.btnTask1); btnTask2 = findViewById(R.id.btnTask2); btnTask3 = findViewById(R.id.btnTask3); btnTask4 = findViewById(R.id.btnTask4); // Установка информации о студенте tvStudentInfo.setText("Фамилия: Кашина\nГруппа: ИПсп-"); btnTask1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(MainActivity.this, Task1Activity.class)); } }); btnTask2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(MainActivity.this, Task2Activity.class)); } }); btnTask3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(MainActivity.this, Task3Activity.class)); } }); btnTask4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(MainActivity.this, Task4Activity.class)); } }); } }

7. Task1Activity.Java

package com.example.laba13_2; import android.bluetooth.BluetoothAdapter; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; public class Task1Activity extends AppCompatActivity { private Button btnOn, btnOff, btnBack; private BluetoothAdapter bluetoothAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_task1); btnOn = findViewById(R.id.btnOn); btnOff = findViewById(R.id.btnOFF); btnBack = findViewById(R.id.btnBack); bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); btnOn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (bluetoothAdapter == null) { Toast.makeText(getApplicationContext(), "Bluetooth не поддерживается", Toast.LENGTH_SHORT).show(); } else { if (!bluetoothAdapter.isEnabled()) { bluetoothAdapter.enable(); Toast.makeText(getApplicationContext(), "Bluetooth включается...", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getApplicationContext(), "Bluetooth уже включен", Toast.LENGTH_SHORT).show(); } } } }); btnOff.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (bluetoothAdapter != null) { if (bluetoothAdapter.isEnabled()) { bluetoothAdapter.disable(); Toast.makeText(getApplicationContext(), "Bluetooth выключается...", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getApplicationContext(), "Bluetooth уже выключен", Toast.LENGTH_SHORT).show(); } } } }); btnBack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }