切换A2DP设备（安卓） [英] Toggling A2DP Device (Android)

问题描述

我有两个配对的蓝牙设备（我的车头上，单位电话音频和一个独立的蓝牙接收器支持A2DP）。我的手机上有一个为用于媒体音频，我必须手动切换为我A2DP输出去我的车的喇叭复选框。我的目标是通过编程方式切换此。

I have two paired bluetooth devices (my car's head-unit for phone audio and a separate bluetooth receiver for A2DP). On my phone there's a checkbox for "Use for media audio" that I have to manually toggle for my A2DP output to go to my car's speakers. My goal is to toggle this programmatically.

我试图同时使用AudioManager类去precated setBluetoothA2dpOn和setBluetoothScoOn但是他们俩谁也没有任何效果。我能得到的蓝牙配对设备列表，并得到一个处理我想切换连接，但我似乎无法得到它完全正确。我也尝试获取默认的蓝牙适配器，然后使用getProfileProxy，但我觉得我找错了树那里。

I tried using both the AudioManager class with the deprecated setBluetoothA2dpOn and the setBluetoothScoOn but neither seemed to have any effect. I was able to get a list of the bluetooth paired devices and get a handle to the connection I want to toggle but I couldn't seem to get it quite right. I also tried getting the default bluetooth adapter and then using getProfileProxy but I feel like I'm barking up the wrong tree there.

任何人都可以点我在正确的方向？基本上所有我想要做的是检查用于媒体音频中的等价物。

Can anyone point me in the right direction? Basically all I want to do is the equivalent of checking that "Use for media audio" box.

推荐答案

一个很短的时间以前，我也有类似的问题，试图蓝牙设备连接到Android手机。虽然你的设备配置文件是不同的，我认为解决的办法是一样的。

A short time ago I had a similar problem trying connect a bluetooth device to android phone. Although your device profile being different, I think the solution is the same.

首先，你需要创建一个包在你的项目名为 android.bluetooth ，把下面的 IBluetoothA2dp.aidl 在那里：

First you need create a package in your project named android.bluetooth and put the following IBluetoothA2dp.aidl in there:

package android.bluetooth;

import android.bluetooth.BluetoothDevice;

/**
 * System private API for Bluetooth A2DP service
 *
 * {@hide}
 */
interface IBluetoothA2dp {
    boolean connectSink(in BluetoothDevice device);
    boolean disconnectSink(in BluetoothDevice device);
    boolean suspendSink(in BluetoothDevice device);
    boolean resumeSink(in BluetoothDevice device);
    BluetoothDevice[] getConnectedSinks(); 
    BluetoothDevice[] getNonDisconnectedSinks();
    int getSinkState(in BluetoothDevice device);
    boolean setSinkPriority(in BluetoothDevice device, int priority);
    int getSinkPriority(in BluetoothDevice device);

    boolean connectSinkInternal(in BluetoothDevice device);
    boolean disconnectSinkInternal(in BluetoothDevice device);
}

然后，要访问这些功能，把下面的类项目中的：

Then, to access those functionalities, put the following class in your project:

public class BluetoothA2dpConnection {

private IBluetoothA2dp mService = null;

public BluetoothA2dpConnection() {

    try {
        Class<?>  classServiceManager = Class.forName("android.os.ServiceManager");
        Method methodGetService = classServiceManager.getMethod("getService", String.class);
        IBinder binder = (IBinder) methodGetService.invoke(null, "bluetooth_a2dp");
        mService = IBluetoothA2dp.Stub.asInterface(binder); 
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }
}

public boolean connect(BluetoothDevice device) {
    if (mService == null || device == null) {
        return false;
    }
    try {
        mService.connectSink(device);
    } catch (RemoteException e) {
        e.printStackTrace();
        return false;
    }
    return true;
}

public boolean disconnect(BluetoothDevice device) {
    if (mService == null || device == null) {
        return false;
    }
    try {
        mService.disconnectSink(device);
    } catch (RemoteException e) {
        e.printStackTrace();
        return false;
    }
    return true;
}

}

最后，连接您的A2DP设备，选择一个BluetoothDevice类从配对设备列表，并将其作为的参数连接方法来发送。一定要选择一个设备与正确的配置文件，否则就会产生异常。

Finally, to connect your A2dp device, pick one BluetoothDevice from a list of paired devices and send it as parameter of connect method. Be sure to pick a device with the correct profile, otherwise you will have an exception.

我已经测试了这种解决方案在手机中采用Android 2.3版本，它工作得很好。

I have tested this solution in a phone with android version 2.3 and it worked fine.

对不起任何英语的错误。我希望这可以帮助你。

Sorry any English mistake. I hope this can help you.

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