Uygulama üzerinde 1 actvitye bağlı birden fazla fragment oluşturduğumuzu varsayarsak bu fragmentler içerisinde 1 tanesinde bluetooth bağlantısı yapıp (listeleyip, bağlanıp) diğer fragmentlarda bu bağlantıyı kullanarak bağlı olduğum cihaza bluetoothla veri gönderebilir miyim?

Yani sormak istediğim bir fragment üzerindeki bilgi diğerine aktarılabilir mi ?

Merhaba, activity geçişlerinde büyük sorun yaşıyorum. İlk sayfada bluetooth bağlantısını yapıp ilk sayfadaki listeleme işlemi için gerekli butona bastığımda diğer açılan sayfada bluetooth cihazlarını listeleyip bağlanmak istiyorum. Geçişte sorun yok ama bluetooth cihazlarının listesini çekemiyorum nerede hata var acaba yardımcı olursanız sevinirim.

MainActivity.java:

package com.example.duygu.mybluetoothapp;


import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.UUID;


public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{
    private static final String TAG = "MainActivity";

    BluetoothAdapter mBluetoothAdapter;
    Button btnEnableDisable_Discoverable;

    BluetoothConnectionService mBluetoothConnection;
    public static String EXTRA_ADDRESS = "device_address";

   // Button btnStartConnection;
    Button btnSend;

    EditText etSend;
    TextView textview;

    TextView   incomingMessages;
    StringBuilder messages;

    private static final UUID MY_UUID_INSECURE =
            UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    BluetoothDevice mBTDevice;

    public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();

    public DeviceListAdapter mDeviceListAdapter;

   ListView lvNewDevices;


    // Create a BroadcastReceiver for ACTION_FOUND
    private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            // When discovery finds a device
            if (action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED)) {
                final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, mBluetoothAdapter.ERROR);

                switch(state){
                    case BluetoothAdapter.STATE_OFF:
                        textview.setText("OFF");
                        Log.d(TAG, "onReceive: STATE OFF");

                        break;
                    case BluetoothAdapter.STATE_TURNING_OFF:
                        textview.setText("TURNING OFF");

                        Log.d(TAG, "mBroadcastReceiver1: STATE TURNING OFF");
                        break;
                    case BluetoothAdapter.STATE_ON:
                        textview.setText("ON");

                        Log.d(TAG, "mBroadcastReceiver1: STATE ON");
                        break;
                    case BluetoothAdapter.STATE_TURNING_ON:
                        textview.setText("TURNING ON");

                        Log.d(TAG, "mBroadcastReceiver1: STATE TURNING ON");
                        break;
                }
            }
        }
    };



    /**
     * Broadcast Receiver for changes made to bluetooth states such as:
     * 1) Discoverability mode on/off or expire.
     */
    private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if (action.equals(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) {

                int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);

                switch (mode) {
                    //Device is in Discoverable Mode
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
                        textview.setText("ENABLED");

                        Log.d(TAG, "mBroadcastReceiver2: Discoverability Enabled.");
                        break;
                    //Device not in discoverable mode
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
                        textview.setText("DISABLED");

                        Log.d(TAG, "mBroadcastReceiver2: Discoverability Disabled. Able to receive connections.");
                        break;
                    case BluetoothAdapter.SCAN_MODE_NONE:
                        Log.d(TAG, "mBroadcastReceiver2: Discoverability Disabled. Not able to receive connections.");
                        break;
                    case BluetoothAdapter.STATE_CONNECTING:
                        Log.d(TAG, "mBroadcastReceiver2: Connecting....");
                        break;
                    case BluetoothAdapter.STATE_CONNECTED:
                        Log.d(TAG, "mBroadcastReceiver2: Connected.");
                        break;
                }

            }
        }
    };




    /**
     * Broadcast Receiver for listing devices that are not yet paired
     * -Executed by btnDiscover() method.
     */
    private BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            Log.d(TAG, "onReceive: ACTION FOUND.");

            if (action.equals(BluetoothDevice.ACTION_FOUND)){
                BluetoothDevice device = intent.getParcelableExtra (BluetoothDevice.EXTRA_DEVICE);

                mBTDevices.add(device);
                Log.d(TAG, "onReceive: " + device.getName() + ": " + device.getAddress());
                mDeviceListAdapter = new DeviceListAdapter(context, R.layout.device_adapter_layout, mBTDevices);
                lvNewDevices.setAdapter(mDeviceListAdapter);

                Intent i = new Intent(MainActivity.this, DeviceListPage.class);
                //Change the activity.
                i.setPackage("com.android.bluetooth");

                i.putExtra(EXTRA_ADDRESS, device.getAddress()); //this will be received at ledControl (class) Activity
                startActivity(i);
            }
        }
    };

    /**
     * Broadcast Receiver that detects bond state changes (Pairing status changes)
     */
    private final BroadcastReceiver mBroadcastReceiver4 = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if(action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)){
                BluetoothDevice mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                //3 cases:
                //case1: bonded already
                if (mDevice.getBondState() == BluetoothDevice.BOND_BONDED){
                    Log.d(TAG, "BroadcastReceiver: BOND_BONDED.");
                    //inside BroadcastReceiver4
                    mBTDevice = mDevice;
                }
                //case2: creating a bone
                if (mDevice.getBondState() == BluetoothDevice.BOND_BONDING) {
                    Log.d(TAG, "BroadcastReceiver: BOND_BONDING.");
                }
                //case3: breaking a bond
                if (mDevice.getBondState() == BluetoothDevice.BOND_NONE) {
                    Log.d(TAG, "BroadcastReceiver: BOND_NONE.");
                }
            }
        }
    };



    @Override
    protected void onDestroy() {
        Log.d(TAG, "onDestroy: called.");
        super.onDestroy();
        unregisterReceiver(mBroadcastReceiver1);
        unregisterReceiver(mBroadcastReceiver2);
        unregisterReceiver(mBroadcastReceiver3);
        unregisterReceiver(mBroadcastReceiver4);
        //mBluetoothAdapter.cancelDiscovery();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnONOFF = (Button) findViewById(R.id.btnONOFF);
        btnEnableDisable_Discoverable = (Button) findViewById(R.id.btnDiscoverable_on_off);
        lvNewDevices = (ListView) findViewById(R.id.lvNewDevices);
        mBTDevices = new ArrayList<>();

        //btnStartConnection = (Button) findViewById(R.id.btnStartConnection);
        btnSend = (Button) findViewById(R.id.btnSend);
        etSend = (EditText) findViewById(R.id.editText);
        textview = (TextView) findViewById(R.id.textview);
        incomingMessages=(TextView) findViewById(R.id.incomingMessages);
        messages =new StringBuilder();
        LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver, new IntentFilter("incomingMessage"));



        //Broadcasts when bond state changes (ie:pairing)
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
        registerReceiver(mBroadcastReceiver4, filter);

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        lvNewDevices.setOnItemClickListener(MainActivity.this);


        btnONOFF.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d(TAG, "onClick: enabling/disabling bluetooth.");
                enableDisableBT();
            }
        });


        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                byte[] bytes = etSend.getText().toString().getBytes(Charset.defaultCharset());
                mBluetoothConnection.write(bytes);
                etSend.setText("");

            }
        });

    }

    BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String text=intent.getStringExtra("theMessage");
            messages.append(text+"\n");
            incomingMessages.setText(messages);

        }
    };

    //create method for starting connection
//***remember the conncction will fail and app will crash if you haven't paired first




    public void enableDisableBT(){
        if(mBluetoothAdapter == null){
            Log.d(TAG, "enableDisableBT: Does not have BT capabilities.");
        }
        if(!mBluetoothAdapter.isEnabled()){
            Log.d(TAG, "enableDisableBT: enabling BT.");
            Intent enableBTIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivity(enableBTIntent);

            IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
            registerReceiver(mBroadcastReceiver1, BTIntent);
        }
        if(mBluetoothAdapter.isEnabled()){
            Log.d(TAG, "enableDisableBT: disabling BT.");
            mBluetoothAdapter.disable();

            IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
            registerReceiver(mBroadcastReceiver1, BTIntent);
        }

    }


    public void btnEnableDisable_Discoverable(View view) {
        Log.d(TAG, "btnEnableDisable_Discoverable: Making device discoverable for 300 seconds.");

        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
        startActivity(discoverableIntent);

        IntentFilter intentFilter = new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
        registerReceiver(mBroadcastReceiver2,intentFilter);

    }

    @RequiresApi(api = Build.VERSION_CODES.M)
    public void btnDiscover(View view) {
        Log.d(TAG, "btnDiscover: Looking for unpaired devices.");

        if(mBluetoothAdapter.isDiscovering()){
            mBluetoothAdapter.cancelDiscovery();
            Log.d(TAG, "btnDiscover: Canceling discovery.");

            //check BT permissions in manifest
            checkBTPermissions();

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
        }
        if(!mBluetoothAdapter.isDiscovering()){

            //check BT permissions in manifest
            checkBTPermissions();

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
        }


    }

    /**
     * This method is required for all devices running API23+
     * Android must programmatically check the permissions for bluetooth. Putting the proper permissions
     * in the manifest is not enough.
     *
     * NOTE: This will only execute on versions > LOLLIPOP because it is not needed otherwise.
     */
    @RequiresApi(api = Build.VERSION_CODES.M)
    private void checkBTPermissions() {
        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
            int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
            permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_COARSE_LOCATION");
            if (permissionCheck != 0) {

                this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1001); //Any number
            }
        }else{
            Log.d(TAG, "checkBTPermissions: No need to check permissions. SDK version < LOLLIPOP.");
        }
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

        //first cancel discovery because its very memory intensive.
        mBluetoothAdapter.cancelDiscovery();

        Log.d(TAG, "onItemClick: You Clicked on a device.");
        String deviceName = mBTDevices.get(i).getName();
        String deviceAddress = mBTDevices.get(i).getAddress();

        Log.d(TAG, "onItemClick: deviceName = " + deviceName);
        Log.d(TAG, "onItemClick: deviceAddress = " + deviceAddress);

        //create the bond.
        //NOTE: Requires API 17+? I think this is JellyBean
        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2){
            Log.d(TAG, "Trying to pair with " + deviceName);
            mBTDevices.get(i).createBond();

            mBTDevice = mBTDevices.get(i);
            mBluetoothConnection = new BluetoothConnectionService(MainActivity.this);
        }




    }
}

DevicListPAge.java: (2.activity)

package com.example.duygu.mybluetoothapp;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.UUID;

public class DeviceListPage extends Activity {
    private static final String TAG = "MainActivity";

    Button btnStartConnection;
    BluetoothAdapter mBluetoothAdapter;

    BluetoothDevice mBTDevice;
    ListView lvNewDevices;
    BluetoothConnectionService mBluetoothConnection;
    public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();

    public DeviceListAdapter mDeviceListAdapter;
    private static final UUID MY_UUID_INSECURE =
            UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent newint = getIntent();
      String deviceAddress = newint.getStringExtra(MainActivity.EXTRA_ADDRESS);
        setContentView(R.layout.activity_device_list_page);
        btnStartConnection = (Button) findViewById(R.id.btnStartConnection);
        lvNewDevices = (ListView) findViewById(R.id.lvNewDevices);

        lvNewDevices.setAdapter(mDeviceListAdapter);

        btnStartConnection.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startConnection();
            }
        });

    }

    public void startConnection(){
        startBTConnection(mBTDevice,MY_UUID_INSECURE);
    }

    /**
     * starting chat service method
     */
    public void startBTConnection(BluetoothDevice device, UUID uuid){
        Log.d(TAG, "startBTConnection: Initializing RFCOM Bluetooth Connection.");

        mBluetoothConnection.startClient(device,uuid);
    }

}