Page 384 - MDP2022-2

bluetooth -
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
import static android.text.TextUtils.expandTemplate;
import static android.text.TextUtils.split;
public class MainActivity extends AppCompatActivity {
// GUI Components
private TextView mBluetoothStatus;
private TextView mReadBuffer;
private Button mScanBtn;
private Button mOffBtn;
private Button mListPairedDevicesBtn;
private Button mDiscoverBtn;
private BluetoothAdapter mBTAdapter;
private Set<BluetoothDevice> mPairedDevices;
private ArrayAdapter<String> mBTArrayAdapter;
private ListView mDevicesListView;
private CheckBox mLED1;
private Handler mHandler;
private ConnectedThread mConnectedThread;
private BluetoothSocket mBTSocket = null;
Set<BluetoothDevice> pairedDevices;
ArrayAdapter<String> btArrayAdapter;
ArrayList<String> deviceAddressArray;
private String TAG = MainActivity.class.getSimpleName();
private WebView webView = null;
WebSettings webSettings;
boolean request = false;
private WebView yame = null;
WebSettings yameSettings;
private int coinCheck = 0;

//private OutputStream outputStream = null;
private static final UUID BTMODULEUUID =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private final static int REQUEST_ENABLE_BT = 1;