Existe-t-il un moyen de corriger l'interaction de l'écran de démarrage avec le code et d'éviter de planter?

Je configure cette application Bluetooth Android à l'aide du studio Android et j'ai du mal à afficher correctement l'écran de démarrage, puis à effectuer la transition avec le programme. Que dois-je faire pour que mon écran principal et mon écran de démarrage fonctionnent ensemble sans que le programme ne plante?

J'ai essayé de manipuler le manifeste pour que l'interface graphique principale et l'écran de démarrage fonctionnent ensemble, mais en général, un seul d'entre eux fonctionne , suivi d'un crash de l'application. J'utilise actuellement la dernière version d'Android Studio et j'ai révisé l'écran de démarrage plusieurs fois, mais je pense que le problème principal est lié au manifeste.

AndroidManifest

package com.example.harbit;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Handler;

import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

public class BTGU extends AppCompatActivity {

    //1)
    ImageButton IdListen, IdRecord,IdFiles,IdDisconect;
    TextView IdBPM;
    //-------------------------------------------
    Handler bluetoothIn;
    final int handlerState = 0;
    private BluetoothAdapter btAdapter = null;
    private BluetoothSocket btSocket = null;
    private StringBuilder DataStringIN = new StringBuilder();
    private ConnectedThread MyConexionBT;
    // Unique identifier of service - SPP UUID
    private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    // String for MAC address
    private static String address = null;
    //-------------------------------------------

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_btgu);
        //Link buttons to on click listeners
        IdListen = (ImageButton) findViewById(R.id.IdListen);
        IdRecord = (ImageButton) findViewById(R.id.IdRecord);
        IdFiles = (ImageButton) findViewById(R.id.IdFiles);
        IdDisconect = (ImageButton) findViewById(R.id.IdDisconect);
        IdBPM = (TextView) findViewById(R.id.IdBPM);

        bluetoothIn = new Handler() {
            public void handleMessage(android.os.Message msg) {
                if (msg.what == handlerState) {
                    String readMessage = (String) msg.obj;
                    DataStringIN.append(readMessage);

                    int endOfLineIndex = DataStringIN.indexOf("#");

                    if (endOfLineIndex > 0) {
                        String dataInPrint = DataStringIN.substring(0, endOfLineIndex);
                        IdBPM.setText("BPM: " + dataInPrint);
                        DataStringIN.delete(0, DataStringIN.length());
                    }
                }
            }
        };

        btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
        VerifyBT();

        // setup onClick listeners for the buttons
        // to indicate the following active after activation
        // of the onclick event
        // as an RXTX event
        IdListen.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v)
            {
                MyConexionBT.write("1");
            }
        });

        IdRecord.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                MyConexionBT.write("2");
            }
        });

        IdFiles.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v)
            {
              //----------------------------------------------------------------------------------------------------->>>>>>
            }
        });

        IdDisconect.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (btSocket!=null)
                {
                    try {btSocket.close();}
                    catch (IOException e)
                    { Toast.makeText(getBaseContext(), "Error", Toast.LENGTH_SHORT).show();;}
                }
                finish();
            }
        });
    }

    private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException
    {
        //Safe exit removal of the device
        //using service UUID
        return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
    }

    @Override
    public void onResume()
    {
        super.onResume();
        //get the MAC address from DeviceListActivity via intent
        Intent intent = getIntent();
        //get the MAC address from DeviceListActivity via EXTRA
        address = intent.getStringExtra(BT.EXTRA_DEVICE_ADDRESS);
        //Set the MAC address
        BluetoothDevice device = btAdapter.getRemoteDevice(address);

        try
        {
            btSocket = createBluetoothSocket(device);
        } catch (IOException e) {
            Toast.makeText(getBaseContext(), "Socket creation failed", Toast.LENGTH_LONG).show();
        }
        // establish connection with Bluetooth socket.
        try
        {
            btSocket.connect();
        } catch (IOException e) {
            try {
                btSocket.close();
            } catch (IOException e2) {}
        }
        MyConexionBT = new ConnectedThread(btSocket);
        MyConexionBT.start();
    }

    @Override
    public void onPause()
    {
        super.onPause();
        try
        { // when out of the app this allows for the closing of the socket
            btSocket.close();
        } catch (IOException e2) {}
    }

    //check the device bluetooth and if off pop a message to turn it on
    private void VerifyBT() {

        if(btAdapter==null) {
            Toast.makeText(getBaseContext(), "Device does not support Bluetooth", Toast.LENGTH_LONG).show();
        } else {
            if (btAdapter.isEnabled()) {
            } else {
                Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBtIntent, 1);
            }
        }
    }

    //Create the class that enables the event of connectivity
    private class ConnectedThread extends Thread
    {
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket)
        {
            InputStream tmpIn = null;
            OutputStream tmpOut = null;
            try
            {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) { }
            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }
// set up Rx for incoming data
        public void run()
        {
            byte[] buffer = new byte[256];
            int bytes;

            // Begin listen mode to determine the incoming data
            while (true) {
                try {
                    bytes = mmInStream.read(buffer);
                    String readMessage = new String(buffer, 0, bytes);
                    // Send the obtained data to the event via handler
                    bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
                } catch (IOException e) {
                    break;
                }
            }
        }
        //String TX to the receiving device
        public void write(String input)
        {
            try {
                mmOutStream.write(input.getBytes());
            }
            catch (IOException e)
            {
                //If TX not available close connectivity
                Toast.makeText(getBaseContext(), "Connection failed", Toast.LENGTH_LONG).show();
                finish();
            }
        }
    }
}