如何將多個藍牙音頻設備與Android手機連接，一個設備應錄音而另一設備應播放？

Question

我正在嘗試使用我需要滿足以下情況的藍牙設備開發一個音頻記錄播放應用程序。

• 如果連接了多個音頻設備，則其中一個正在錄制音頻，則另一台設備應同時播放音頻。

我可以在下面的MainActivity類中連接藍牙設備，但是音頻無法在藍牙設備上播放。

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;
import java.util.Set;
import java.util.TimeZone;
import java.util.UUID;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends Activity implements Runnable 
{
    protected static final String TAG = "TAG";
    private static final int REQUEST_CONNECT_DEVICE = 1;
    private static final int REQUEST_ENABLE_BT = 2;
    Button mScan;
    BluetoothAdapter mBluetoothAdapter;
    private UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    private ProgressDialog mBluetoothConnectProgressDialog;
    private BluetoothSocket mBluetoothSocket;
    BluetoothDevice mBluetoothDevice;

    @Override
    public void onCreate(Bundle mSavedInstanceState) 
    {
        super.onCreate(mSavedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
        mScan = (Button) findViewById(R.id.Scan);
        mScan.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View mView) 
            {
                mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
                if (mBluetoothAdapter == null) 
                {
                    Toast.makeText(Main.this, "Message1", 2000).show();
                } 
                else 
                {
                    if (!mBluetoothAdapter.isEnabled()) 
                    {
                        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
                    } 
                    else 
                    {
                        ListPairedDevices();
                        Intent connectIntent = new Intent(Main.this, DeviceListActivity.class);
                        startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
                    }
                }
            }
        });

        mTune.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View mView) 
            {
                mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
                if (mBluetoothAdapter == null) 
                {
                    Toast.makeText(Main.this, "Message2", 2000).show();
                } 
                else 
                {
                    if (!mBluetoothAdapter.isEnabled()) 
                    {
                        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
                    } 
                    else 
                    {
                        ListPairedDevices();
                        Intent connectIntent = new Intent(Main.this, DeviceListActivity.class);
                        startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
                    }
                }
            }
        });
    }// onCreate

    public void onActivityResult(int mRequestCode, int mResultCode, Intent mDataIntent) 
    {
        super.onActivityResult(mRequestCode, mResultCode, mDataIntent);

        switch (mRequestCode) 
        {
            case REQUEST_CONNECT_DEVICE:
                if (mResultCode == Activity.RESULT_OK) 
                {
                    Bundle mExtra = mDataIntent.getExtras();
                    String mDeviceAddress = mExtra.getString("DeviceAddress");
                    Log.v(TAG, "Coming incoming address " + mDeviceAddress);
                    mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(mDeviceAddress);
                    mBluetoothConnectProgressDialog = ProgressDialog.show(this, "Connecting...", mBluetoothDevice.getName() + " : " + mBluetoothDevice.getAddress(), true, false);
                    Thread mBlutoothConnectThread = new Thread(this);
                    mBlutoothConnectThread.start();
                    //pairToDevice(mBluetoothDevice); This method is replaced by progress dialog with thread
                }
                break;

            case REQUEST_ENABLE_BT:
                if (mResultCode == Activity.RESULT_OK) 
                {
                    ListPairedDevices();
                    Intent connectIntent = new Intent(Main.this, DeviceListActivity.class);
                    startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
                } 
                else 
                {
                    Toast.makeText(Main.this, "Message", 2000).show();
                }
                break;
        }
    }

    private void ListPairedDevices() 
    {
        Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter.getBondedDevices();
        if (mPairedDevices.size() > 0) 
        {
            for (BluetoothDevice mDevice : mPairedDevices) 
            {
                Log.v(TAG, "PairedDevices: " + mDevice.getName() + " " + mDevice.getAddress());
            }
        }
    }

    public void run() 
    {
        try 
        {
            mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(applicationUUID);
            mBluetoothAdapter.cancelDiscovery();
            mBluetoothSocket.connect();
            mHandler.sendEmptyMessage(0);
        }
        catch (IOException eConnectException) 
        {
            Log.d(TAG, "CouldNotConnectToSocket", eConnectException);
             closeSocket(mBluetoothSocket);
             return;
        }
    }

    private void closeSocket(BluetoothSocket nOpenSocket) 
    {
        try 
        {
            nOpenSocket.close();
            Log.d(TAG, "SocketClosed");
        } 
        catch (IOException ex) 
        {
            Log.d(TAG, "CouldNotCloseSocket");
        }
    }

    private Handler mHandler = new Handler() 
    {
        @Override
        public void handleMessage(Message msg) 
        {
            mBluetoothConnectProgressDialog.dismiss();
            Toast.makeText(Main.this, "DeviceConnected", 5000).show();
        }
    };
} 

Answer 1

根據我所做的所有研究，答案是否定的。 除非您的電話/平板電腦/ mp3播放器中有多個藍牙芯片（極不可能的情況），或者某種集線器/接收器已與房屋內的揚聲器連接，否則您將只能使用一個藍牙揚聲器。 但是，與簡單的藍牙連接相比，可以創建更多復雜的設置。 有藍牙音頻接收器可以插入揚聲器的音頻輸入電纜。 這些與長電線和分離器相結合，可以完成您的工作。 如果您想使其無線化，FM發射器就是一回事。 藍牙接收器將連接到調頻發射器，並且每個揚聲器都可以與調頻接收器配對，您可以使用了。

如果您確實找到了解決方案，我將非常感興趣。