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在错误的道路上浸泡了将近两个月后，我发现了我的错误是什么。现在我正在解决一个我找不到答案的新问题：尝试连接耳机时使用此功能：

   mBluetoothAdapter.getProfileProxy(context, mProfileListener, BluetoothProfile.HEADSET);
    final BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener() {
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            if (profile == BluetoothProfile.HEADSET) {
                mBluetoothHeadset = (BluetoothHeadset) proxy;
            }
        }
        public void onServiceDisconnected(int profile) {
             if (profile == BluetoothProfile.HEADSET) {
                  mBluetoothHeadset = null;
             }
       }
    };

我无法初始化 mBluetoothHeadset 对象，由于某种原因，调试器不会进入 onServiceConnected 函数。

任何帮助将不胜感激......真的需要一个shai

更多信息： Inded 是在 android 重新启动后需要启用蓝牙'在代码中解决：这是功能代码：Log("PM.CheckForHeadSet","In"); 

    if (mBluetoothAdapter == null) {
        Log("PM.CheckForHeadSet","BlueTooth adapter not found");
        return "Error Bluetooth adapter";
    }
    switch (mBluetoothAdapter.getState()){
        case BluetoothAdapter.STATE_OFF: 
            Log("PM.CheckForHeadSet.getState"," STATE_OFF");
            mBluetoothAdapter.enable();
            break;
        case BluetoothAdapter.STATE_TURNING_ON:
            Log("PM.CheckForHeadSet.getState","STATE_TURNING_ON");
            break;
        case BluetoothAdapter.STATE_ON:
            Log("PM.CheckForHeadSet.getState","STATE_ON");
            break;
        case BluetoothAdapter.STATE_TURNING_OFF:
            Log("PM.CheckForHeadSet.getState","STATE_TURNING_OFF");
            break;
    }
    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

    // If there are paired devices, add each one to the ArrayAdapter
    if (pairedDevices.size() == 1) {
        for (BluetoothDevice device : pairedDevices) 
            if(device.getBondState() == BluetoothDevice.BOND_BONDED){
                Log("PM.CheckForHeadSet Connected to:",device.getName());
            }
    }
    Log("PM.CheckForHeadSet ServiceListener:","In");
    final BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener() {

        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            if (profile == BluetoothProfile.HEADSET) {
                mBluetoothHeadset = (BluetoothHeadset) proxy;
                }
            }
        public void onServiceDisconnected(int profile) {
            if (profile == BluetoothProfile.HEADSET) {
                mBluetoothHeadset = null;        }
            }};
    if(mBluetoothHeadset == null)
        Log("PM.CheckForHeadSet","mBluetoothHeadset = null");
    else
        Log("PM.CheckForHeadSet","mBluetoothHeadset = " + mBluetoothHeadset.toString());
    if(context == null)
        Log("PM.CheckForHeadSet","context = null");
    else
        Log("PM.CheckForHeadSet","context = " + context.toString());

    if(mProfileListener == null)
        Log("PM.CheckForHeadSet","mProfileListener = null");
    else
        Log("PM.CheckForHeadSet","mProfileListener = " + mProfileListener.toString());

    if(mBluetoothAdapter.getProfileProxy(context, mProfileListener, BluetoothProfile.HEADSET) == true)
         Log("PM.CheckForHeadSet.getProfileProxy","true");
    else        
        Log("PM.CheckForHeadSet.getProfileProxy","false"); 
    Log("PM.CheckForHeadSet","Out");
    return "Set Headset";

如果我将 GetProfileProxy 放在新的 ProfileListener 上方（如在 docomantaion 示例中|），mProfileListener var 仍然为 null 并且 getProfileProxy 返回 false

这是logcat：

03-12 10:09:49.906: D/SpySitter(4205): PM.CheckForHeadSet-In
03-12 10:09:50.968: D/dalvikvm(4205): threadid=1: still suspended after undo (sc=1 dc=1)
03-12 10:09:59.453: D/SpySitter(4205): PM.CheckForHeadSet.getState-STATE_ON
03-12 10:10:02.640: D/SpySitter(4205): PM.CheckForHeadSet Connected to:-Motorola H790
03-12 10:10:04.226: D/SpySitter(4205): PM.CheckForHeadSet ServiceListener:-In
03-12 10:10:13.945: D/SpySitter(4205): PM.CheckForHeadSet-mBluetoothHeadset = null
03-12 10:10:17.984: D/SpySitter(4205): PM.CheckForHeadSet-context = android.app.Application@408472a0
03-12 10:10:21.820: D/SpySitter(4205): PM.CheckForHeadSet-mProfileListener = com.example.HelloForm.Tools$1@40894d00
03-12 10:10:28.796: D/SpySitter(4205): PM.CheckForHeadSet.getProfileProxy-true
03-12 10:10:31.226: D/SpySitter(4205): PM.CheckForHeadSet-Out
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1 回答 1

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getProxyProfile 在三种情况下返回 false （这是根据 android-15 源，因此在 android-11 中可能略有不同）：

  • 传入的上下文为空
  • 传入的 BluetoothProfile.ServiceListener 为 null
  • 传入的 int 不是 BluetoothProfile.HEADSET、BluetoothProfile.A2DP、BluetoothProfile.INPUT_DEVICE、BluetoothProfile.PAN 或 BluetoothProfile.HEALTH 之一

我建议您在调用 getProxyProfile 时设置一个断点，以确定哪些情况导致false返回值。

编辑：更多信息

必须支持并启用蓝牙才能调用接口方法。如果不支持蓝牙，getDefaultAdapter()将返回null。如果您有适配器，您可以通过调用适配器检查蓝牙是否启用isEnabled()。这很简单，所以你可能已经这样做了。

onServiceConnected由类中的android.content.ServiceConnection成员 ( mServiceConnection)调用，而 Android OS在创建对象时BluetoothHeadset通过调用依次调用该成员 如果此服务的绑定失败，logcat 消息日志中应该会出现错误，例如：bindServiceBluetoothHeadset

       "Could not bind to Bluetooth Headset Service"

带有“蓝牙耳机”标签。如果您没有看到此错误，则说明事情可能在后台正常运行。

最后一点是，Android 一次只支持一个连接的耳机。确保在运行此代码时未连接耳机。同样，许多设备一次只支持一个蓝牙连接。如果这适用于您的设备，您需要确保在运行此代码时它尚未连接。

这几乎耗尽了我所知道的并且可以轻松确定蓝牙连接。希望它可以帮助您解决您的问题。

于 2012-03-07T14:38:16.127 回答