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Android蓝牙使能流程图(Android Bluetooth enable) -- java & jni层_config_hearing_aid_profile_supported

作者：很楠不爱3 | 2024-03-26 17:40:13

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config_hearing_aid_profile_supported

在介绍Android enable流程之前，我们首先来看下Android的流程图

以上图示是android8以上的，主要跟Android8之前的架构在于Bluetooth stack跟vendor层之间增加一层HIDL，主要是抽象硬件层的作用

OK，回归主题，我们来看下Android的enable流程，首先上一张架构图

另外声明下：我们做了一些列的蓝牙教程(包括视频)。我们会以连载的方式持续更新,内容如下：

本专栏文章我们会以连载的方式持续更新，本专栏计划更新内容如下：

第一篇:蓝牙综合介绍，主要介绍蓝牙的一些概念，产生背景，发展轨迹，市面蓝牙介绍，以及蓝牙开发板介绍。

第二篇:Transport层介绍,主要介绍蓝牙协议栈跟蓝牙芯片之前的硬件传输协议,比如基于UART的H4,H5,BCSP，基于USB的H2等

第三篇:传统蓝牙controller介绍，主要介绍传统蓝牙芯片的介绍，包括射频层（RF），基带层（baseband），链路管理层（LMP）等

第四篇:传统蓝牙host介绍，主要介绍传统蓝牙的协议栈，比如HCI,L2CAP,SDP,RFCOMM,HFP,SPP,HID,AVDTP,AVCTP,A2DP,AVRCP,OBEX,PBAP,MAP等等一系列的协议吧。

第五篇：低功耗蓝牙controller介绍，主要介绍低功耗蓝牙芯片，包括物理层（PHY），链路层（LL）

第六篇：低功耗蓝牙host介绍，低功耗蓝牙协议栈的介绍，包括HCI,L2CAP,ATT,GATT,SM等

第七篇：蓝牙芯片介绍，主要介绍一些蓝牙芯片的初始化流程，基于HCI vendor command的扩展

第八篇：附录，主要介绍以上常用名词的介绍以及一些特殊流程的介绍等。

另外，开发板如下所示，对于想学习蓝牙协议栈的最好人手一套。以便更好的学习蓝牙协议栈，相信我，学完这一套视频你将拥有修改任何协议栈的能力（比如Linux下的bluez，Android下的bluedroid）。

-------------------------------------------------------------------------------------------------------------------------

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蓝牙交流扣扣群：970324688

Github代码：GitHub - sj15712795029/bluetooth_stack: 这是一个开源的双模蓝牙协议栈(bluetooth.stack)(btstack),可以运行在STM32,Linux.，包含HCI,L2CAP,SDP,RFCOMM,HFP,SPP,A2DP,AVRCP,AVDTP,AVCTP,OBEX,PBAP等协议，后续会继续维护，以达到商用的目的

入手开发板：https://shop220811498.taobao.com/category-1542116976.htm?spm=a1z10.5-c-s.w4010-22329603913.7.39ca7dbe2EA0K3&search=y&catName=%C0%B6%D1%C0%BF%AA%B7%A2%B0%E5#bd

蓝牙学习目录：一篇文章足够你学习蓝牙技术，提供史上最全的蓝牙技术（传统蓝牙/低功耗蓝牙）文章总结，文档下载总结（2020/12/11更新）_Wireless_Link的博客-CSDN博客_蓝牙eir

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步骤1：开机会启动SystemServer类的main函数

在Android系统启动过程中，SystemServer是第一个被启动的进程。当Android设备被开机后，内核会创建一个名为init的进程，init进程会启动Zygote进程，Zygote进程会启动SystemServer进程。因此，SystemServer是整个Android系统启动的核心进程，它负责初始化并启动大部分系统服务和应用程序，是整个Android系统的主要启动入口。

具体来说，SystemServer主要完成以下几个任务：

启动和初始化系统服务：SystemServer会启动和初始化大部分系统服务，例如ActivityManagerService、WindowManagerService、PackageManagerService、PowerManagerService等等。这些服务会在启动过程中被创建并注册到系统服务中心，供其他应用程序和服务调用。

启动和初始化核心应用程序：SystemServer会启动和初始化Android系统中的核心应用程序，例如SystemUI、Settings等等。这些应用程序会在启动过程中被创建并运行，提供各种用户界面和功能。

加载和初始化系统属性：SystemServer会加载和初始化/system/build.prop文件中定义的系统属性，例如设备型号、厂商信息等等。这些属性可以在系统运行时被访问和修改。

启动Adb守护进程：SystemServer会启动Adb守护进程，使得开发者可以通过adb工具来访问设备。

总之，SystemServer是整个Android系统启动过程中的核心进程，负责启动和初始化大部分系统服务和应用程序，为整个系统的运行提供基础支持。SystemServer的启动时间通常在内核启动之后的几秒钟内，具体时间取决于设备的硬件性能和系统配置。


/**
* The main entry point from zygote.
*/
public static void main(String[] args) {
    new SystemServer().run();
}

SystemServer().run();执行startOtherServices(t);

然后startOtherServices(t);执行如下代码，开启Bluetooth service类


private void startOtherServices(@NonNull TimingsTraceAndSlog t) {
    ...
    if (mFactoryTestMode == FactoryTest.FACTORY_TEST_LOW_LEVEL) {
        Slog.i(TAG, "No Bluetooth Service (factory test)");
    } else if (!context.getPackageManager().hasSystemFeature
            (PackageManager.FEATURE_BLUETOOTH)) {
        Slog.i(TAG, "No Bluetooth Service (Bluetooth Hardware Not Present)");
    } else {
        t.traceBegin("StartBluetoothService");
        mSystemServiceManager.startService(BluetoothService.class);
        t.traceEnd();
    }
    ...
}

步骤2：BluetoothService构造函数中执行创建BluetoothManagerService

mBluetoothManagerService = new BluetoothManagerService(context);


BluetoothManagerService(Context context) {
 
        Slog.e(TAG, "new BluetoothManagerService");
 
        // BluetoothManagerService的私有类，主要用于处理一些message
        mHandler = new BluetoothHandler(IoThread.get().getLooper()); 
 
        mContext = context;
 
        mWirelessConsentRequired = context.getResources()
                .getBoolean(com.android.internal.R.bool.config_wirelessConsentRequired);
 
        mCrashes = 0;
        mBluetooth = null;
        mBluetoothBinder = null;
        mBluetoothGatt = null;
        mBinding = false;
        mUnbinding = false;
        mEnable = false;
        mState = BluetoothAdapter.STATE_OFF;
        mQuietEnableExternal = false;
        mEnableExternal = false;
        mAddress = null;
        mName = null;
        mErrorRecoveryRetryCounter = 0;
        mContentResolver = context.getContentResolver();
        // Observe BLE scan only mode settings change.
        registerForBleScanModeChange();
        mCallbacks = new RemoteCallbackList<IBluetoothManagerCallback>();
        mStateChangeCallbacks = new RemoteCallbackList<IBluetoothStateChangeCallback>();
 
        mIsHearingAidProfileSupported = context.getResources()
                .getBoolean(com.android.internal.R.bool.config_hearing_aid_profile_supported);
 
        // TODO: We need a more generic way to initialize the persist keys of FeatureFlagUtils
        String value = SystemProperties.get(FeatureFlagUtils.PERSIST_PREFIX + FeatureFlagUtils.HEARING_AID_SETTINGS);
        if (!TextUtils.isEmpty(value)) {
            boolean isHearingAidEnabled = Boolean.parseBoolean(value);
            Log.v(TAG, "set feature flag HEARING_AID_SETTINGS to " + isHearingAidEnabled);
            FeatureFlagUtils.setEnabled(context, FeatureFlagUtils.HEARING_AID_SETTINGS, isHearingAidEnabled);
            if (isHearingAidEnabled && !mIsHearingAidProfileSupported) {
                // Overwrite to enable support by FeatureFlag
                mIsHearingAidProfileSupported = true;
            }
        }
 
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_LOCAL_NAME_CHANGED);
        filter.addAction(BluetoothAdapter.ACTION_BLUETOOTH_ADDRESS_CHANGED);
        filter.addAction(Intent.ACTION_SETTING_RESTORED);
        filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
        mContext.registerReceiver(mReceiver, filter);
 
        loadStoredNameAndAddress();
        if (isBluetoothPersistedStateOn()) {
            if (DBG) {
                Slog.d(TAG, "Startup: Bluetooth persisted state is ON.");
            }
            mEnableExternal = true;
        }
 
        String airplaneModeRadios =
                Settings.Global.getString(mContentResolver, Settings.Global.AIRPLANE_MODE_RADIOS);
        if (airplaneModeRadios == null || airplaneModeRadios.contains(
                Settings.Global.RADIO_BLUETOOTH)) {
            mBluetoothAirplaneModeListener = new BluetoothAirplaneModeListener(
                    this, IoThread.get().getLooper(), context);
        }
 
        int systemUiUid = -1;
        // Check if device is configured with no home screen, which implies no SystemUI.
        boolean noHome = mContext.getResources().getBoolean(R.bool.config_noHomeScreen);
        if (!noHome) {
            PackageManagerInternal pm = LocalServices.getService(PackageManagerInternal.class);
            systemUiUid = pm.getPackageUid(pm.getSystemUiServiceComponent().getPackageName(),
                    MATCH_SYSTEM_ONLY, USER_SYSTEM);
        }
        if (systemUiUid >= 0) {
            Slog.d(TAG, "Detected SystemUiUid: " + Integer.toString(systemUiUid));
        } else {
            // Some platforms, such as wearables do not have a system ui.
            Slog.w(TAG, "Unable to resolve SystemUI's UID.");
        }
        mSystemUiUid = systemUiUid;
    }

步骤3：启动默认用户调用的方法处理


public void onSwitchUser(int userHandle) {
    if (!mInitialized) {
        initialize();
    } else {
        mBluetoothManagerService.handleOnSwitchUser(userHandle);
    }
}

onSwitchUser 是 Android 框架中的一个回调方法，用于在用户切换时接收通知。当有多个用户在同一个设备上使用时，可以使用此方法来执行一些特定于用户的操作，例如切换到其它用户时保存当前用户的状态并加载新用户的数据。

在 Android 系统中，只有在设备启用多用户功能并启用多个用户帐户时才会调用此方法。在单用户设备上，该方法不会被调用。

当一个用户从其它用户切换到当前用户时，系统会调用 onSwitchUser 方法。

当设备启动时，如果已经启用了多用户功能，则系统会自动创建一个默认的用户，并在该用户的环境下启动应用程序。此时，onSwitchUser 方法也会被调用，此时传递给方法的 userId 参数为默认用户的 ID。

备注：该方法已经在 Android 12 中被标记为过时。因此，在新的应用程序中，应该避免使用该方法，而应该考虑使用更现代的 Android 架构组件或 API 来实现多用户管理和数据保护。


private void initialize() {
    if (!mInitialized) {
        mBluetoothManagerService.handleOnBootPhase();
        mInitialized = true;
    }
}


public void handleOnBootPhase() {
    ...
    final boolean isSafeMode = mContext.getPackageManager().isSafeMode();
    if (mEnableExternal && isBluetoothPersistedStateOnBluetooth() && !isSafeMode) {
        if (DBG) {
            Slog.d(TAG, "Auto-enabling Bluetooth.");
        }
        //调用
        sendEnableMsg(mQuietEnableExternal,
                BluetoothProtoEnums.ENABLE_DISABLE_REASON_SYSTEM_BOOT,
                mContext.getPackageName());
    } 
    ....
}

步骤4：BluetoothManagerService.java处理enable


private void sendEnableMsg(boolean quietMode, int reason, String packageName) {
    mHandler.sendMessage(mHandler.obtainMessage(MESSAGE_ENABLE, quietMode ? 1 : 0, 0));
    addActiveLog(reason, packageName, true);
    mLastEnabledTime = SystemClock.elapsedRealtime();
}


public void handleMessage(Message msg)
{
    switch (msg.what)
    {
        case MESSAGE_ENABLE:
            handleEnable(mQuietEnable);
            break;
    }
}


private void handleEnable(boolean quietMode)
{
    ...
    Intent i = new Intent(IBluetooth.class.getName());
    if (!doBind(i, mConnection, Context.BIND_AUTO_CREATE | Context.BIND_IMPORTANT,
            UserHandle.CURRENT)) {
        mHandler.removeMessages(MESSAGE_TIMEOUT_BIND);
    } else {
        mBinding = true;
    }
    ...
}

bond后会调用这个函数onServiceConnected


private class BluetoothServiceConnection implements ServiceConnection {
    public void onServiceConnected(ComponentName componentName, IBinder service) {
        String name = componentName.getClassName();
        if (DBG) {
            Slog.d(TAG, "BluetoothServiceConnection: " + name);
        }
        Message msg = mHandler.obtainMessage(MESSAGE_BLUETOOTH_SERVICE_CONNECTED);
        if (name.equals("com.android.bluetooth.btservice.AdapterService")) {
            msg.arg1 = SERVICE_IBLUETOOTH;
        } else if (name.equals("com.android.bluetooth.gatt.GattService")) {
            msg.arg1 = SERVICE_IBLUETOOTHGATT;
        } else {
            Slog.e(TAG, "Unknown service connected: " + name);
            return;
        }
        msg.obj = service;
        mHandler.sendMessage(msg);
    }
 
    public void onServiceDisconnected(ComponentName componentName) {
        // Called if we unexpectedly disconnect.
        String name = componentName.getClassName();
        if (DBG) {
            Slog.d(TAG, "BluetoothServiceConnection, disconnected: " + name);
        }
        Message msg = mHandler.obtainMessage(MESSAGE_BLUETOOTH_SERVICE_DISCONNECTED);
        if (name.equals("com.android.bluetooth.btservice.AdapterService")) {
            msg.arg1 = SERVICE_IBLUETOOTH;
        } else if (name.equals("com.android.bluetooth.gatt.GattService")) {
            msg.arg1 = SERVICE_IBLUETOOTHGATT;
        } else {
            Slog.e(TAG, "Unknown service disconnected: " + name);
            return;
        }
        mHandler.sendMessage(msg);
    }
}


public void handleMessage(Message msg)
{
    switch (msg.what)
    {
        case MESSAGE_BLUETOOTH_SERVICE_CONNECTED:
            ...
            mBluetooth.registerCallback(mBluetoothCallback);
            ...
            sendBluetoothServiceUpCallback();
            ...
            mBluetooth.enable(mQuietEnable);
            break;
    }
}

步骤5：AdapterService.java处理enable

注意在里面还有一个AdapterServiceBinder的类，不是这个类下面的enable


public synchronized boolean enable(boolean quietMode) {
    // Enforce the user restriction for disallowing Bluetooth if it was set.
    if (mUserManager.hasUserRestriction(UserManager.DISALLOW_BLUETOOTH, UserHandle.SYSTEM)) {
        debugLog("enable() called when Bluetooth was disallowed");
        return false;
    }
 
    Log.e(TAG, "AdapterService enable");
 
    debugLog("enable() - Enable called with quiet mode status =  " + quietMode);
    mQuietmode = quietMode;
    mAdapterStateMachine.sendMessage(AdapterState.BLE_TURN_ON);
    return true;
}

这个会触发status machine，会调用到OffState中processMessage


public boolean processMessage(Message msg) {
    switch (msg.what) {
        case BLE_TURN_ON:
            transitionTo(mTurningBleOnState);
            break;
 
        default:
            infoLog("Unhandled message - " + messageString(msg.what));
            return false;
    }
    return true;
}

然后进入到TurningBleOnState类中的enter


public void enter() {
    super.enter();
    sendMessageDelayed(BLE_START_TIMEOUT, BLE_START_TIMEOUT_DELAY);
    mAdapterService.bringUpBle();
}


void bringUpBle() {
    ...
    //Start Gatt service
    setProfileServiceState(GattService.class, BluetoothAdapter.STATE_ON);
}

开启gattservice服务

另外，ProfileService的状态改变会触发AdapterService的onProfileServiceStateChanged


public void onProfileServiceStateChanged(ProfileService profile, int state) {
    if (state != BluetoothAdapter.STATE_ON && state != BluetoothAdapter.STATE_OFF) {
        throw new IllegalArgumentException(BluetoothAdapter.nameForState(state));
    }
    Message m = mHandler.obtainMessage(MESSAGE_PROFILE_SERVICE_STATE_CHANGED);
    m.obj = profile;
    m.arg1 = state;
    mHandler.sendMessage(m);
}


private void processProfileServiceStateChanged(ProfileService profile, int state) {
    switch (state) {
        case BluetoothAdapter.STATE_ON:
            if (!mRegisteredProfiles.contains(profile)) {
                Log.e(TAG, profile.getName() + " not registered (STATE_ON).");
                return;
            }
            if (mRunningProfiles.contains(profile)) {
                Log.e(TAG, profile.getName() + " already running.");
                return;
            }
            mRunningProfiles.add(profile);
            if (GattService.class.getSimpleName().equals(profile.getName())) {
 
                Log.e(TAG, "processProfileServiceStateChanged enableNative");
 
                // 这个地方就是调用libjni.so的方法，通过jni native调用
                enableNative();
            } else if (mRegisteredProfiles.size() == Config.getSupportedProfiles().length
                    && mRegisteredProfiles.size() == mRunningProfiles.size()) {
                mAdapterProperties.onBluetoothReady();
                updateUuids();
                setBluetoothClassFromConfig();
                initProfileServices();
                getAdapterPropertyNative(AbstractionLayer.BT_PROPERTY_LOCAL_IO_CAPS);
                getAdapterPropertyNative(AbstractionLayer.BT_PROPERTY_LOCAL_IO_CAPS_BLE);
                mAdapterStateMachine.sendMessage(AdapterState.BREDR_STARTED);
            }
            break;
        default:
            Log.e(TAG, "Unhandled profile state: " + state);
    }
}

NOTED：能够直接调用到libbluetooth_jni.so的原因是AdapterApp 类在启动的时候加载了


public class AdapterApp extends Application
{
    private static final String TAG = "BluetoothAdapterApp";
    private static final boolean DBG = false;
    //For Debugging only
    private static int sRefCount = 0;
 
    static {
        if (DBG) {
            Log.d(TAG, "Loading JNI Library");
        }
        System.loadLibrary("bluetooth_jni");
    }
 
    ...
}

然后这个动作会触发com_android_bluetooth_btservice_adapterService.cpp中的


jint JNI_OnLoad(JavaVM* jvm, void* reserved) {
    JNIEnv* e;
    int status;
 
 
    ALOGE("Bluetooth Adapter Service : loading JNI\n");
    ALOGV("Bluetooth Adapter Service : loading JNI\n");
 
    // Check JNI version
    if (jvm->GetEnv((void**)&e, JNI_VERSION_1_6)) {
      ALOGE("JNI version mismatch error");
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_btservice_AdapterService(e);
    if (status < 0) {
      ALOGE("jni adapter service registration failure, status: %d", status);
      return JNI_ERR;
  }
 
    status =
      android::register_com_android_bluetooth_btservice_BluetoothKeystore(e);
    if (status < 0) {
      ALOGE("jni BluetoothKeyStore registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_hfp(e);
    if (status < 0) {
      ALOGE("jni hfp registration failure, status: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_hfpclient(e);
    if (status < 0) {
      ALOGE("jni hfp client registration failure, status: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_a2dp(e);
    if (status < 0) {
      ALOGE("jni a2dp source registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_a2dp_sink(e);
    if (status < 0) {
      ALOGE("jni a2dp sink registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_avrcp_target(e);
    if (status < 0) {
      ALOGE("jni new avrcp target registration failure: %d", status);
  }
 
    status = android::register_com_android_bluetooth_avrcp_controller(e);
    if (status < 0) {
      ALOGE("jni avrcp controller registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_hid_host(e);
    if (status < 0) {
      ALOGE("jni hid registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_hid_device(e);
    if (status < 0) {
      ALOGE("jni hidd registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_pan(e);
    if (status < 0) {
      ALOGE("jni pan registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_gatt(e);
    if (status < 0) {
      ALOGE("jni gatt registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_sdp(e);
    if (status < 0) {
      ALOGE("jni sdp registration failure: %d", status);
      return JNI_ERR;
  }
 
    status = android::register_com_android_bluetooth_hearing_aid(e);
    if (status < 0) {
      ALOGE("jni hearing aid registration failure: %d", status);
      return JNI_ERR;
  }
 
    return JNI_VERSION_1_6;
}

步骤6：bluetooth jni的enableNative处理


static jboolean enableNative(JNIEnv* env, jobject obj) {
  ALOGV("%s", __func__);
 
  if (!sBluetoothInterface) return JNI_FALSE;
  int ret = sBluetoothInterface->enable();
  return (ret == BT_STATUS_SUCCESS || ret == BT_STATUS_DONE) ? JNI_TRUE
                                                             : JNI_FALSE;
}

其中sBluetoothInterface 是hal接口，定义如下：


typedef struct {
    /** set to sizeof(bt_interface_t) */
    size_t size;
    /**
* Opens the interface and provides the callback routines
* to the implemenation of this interface.
* The |is_atv| flag indicates whether the local device is an Android TV
*/
    int (*init)(bt_callbacks_t* callbacks, bool is_atv);
 
    /** Enable Bluetooth. */
    int (*enable)(bool guest_mode);
 
    /** Disable Bluetooth. */
    int (*disable)(void);
 
    /** Closes the interface. */
    void (*cleanup)(void);
 
    /** Get all Bluetooth Adapter properties at init */
    int (*get_adapter_properties)(void);
 
    /** Get Bluetooth Adapter property of 'type' */
    int (*get_adapter_property)(bt_property_type_t type);
 
    /** Set Bluetooth Adapter property of 'type' */
    /* Based on the type, val shall be one of
* RawAddress or bt_bdname_t or bt_scanmode_t etc
*/
    int (*set_adapter_property)(const bt_property_t *property);
 
    /** Get all Remote Device properties */
    int (*get_remote_device_properties)(RawAddress *remote_addr);
 
    /** Get Remote Device property of 'type' */
    int (*get_remote_device_property)(RawAddress *remote_addr,
                                      bt_property_type_t type);
 
    /** Set Remote Device property of 'type' */
    int (*set_remote_device_property)(RawAddress *remote_addr,
                                      const bt_property_t *property);
 
    /** Get Remote Device's service record  for the given UUID */
    int (*get_remote_service_record)(const RawAddress& remote_addr,
                                     const bluetooth::Uuid& uuid);
 
    /** Start SDP to get remote services */
    int (*get_remote_services)(RawAddress *remote_addr);
 
    /** Start Discovery */
    int (*start_discovery)(void);
 
    /** Cancel Discovery */
    int (*cancel_discovery)(void);
 
    /** Create Bluetooth Bonding */
    int (*create_bond)(const RawAddress *bd_addr, int transport);
 
    /** Create Bluetooth Bond using out of band data */
    int (*create_bond_out_of_band)(const RawAddress *bd_addr, int transport,
                                   const bt_out_of_band_data_t *oob_data);
 
    /** Remove Bond */
    int (*remove_bond)(const RawAddress *bd_addr);
 
    /** Cancel Bond */
    int (*cancel_bond)(const RawAddress *bd_addr);
 
    /**
* Get the connection status for a given remote device.
* return value of 0 means the device is not connected,
* non-zero return status indicates an active connection.
*/
    int (*get_connection_state)(const RawAddress *bd_addr);
 
    /** BT Legacy PinKey Reply */
    /** If accept==FALSE, then pin_len and pin_code shall be 0x0 */
    int (*pin_reply)(const RawAddress *bd_addr, uint8_t accept,
                     uint8_t pin_len, bt_pin_code_t *pin_code);
 
    /** BT SSP Reply - Just Works, Numeric Comparison and Passkey
* passkey shall be zero for BT_SSP_VARIANT_PASSKEY_COMPARISON &
* BT_SSP_VARIANT_CONSENT
* For BT_SSP_VARIANT_PASSKEY_ENTRY, if accept==FALSE, then passkey
* shall be zero */
    int (*ssp_reply)(const RawAddress *bd_addr, bt_ssp_variant_t variant,
                     uint8_t accept, uint32_t passkey);
 
    /** Get Bluetooth profile interface */
    const void* (*get_profile_interface) (const char *profile_id);
 
    /** Bluetooth Test Mode APIs - Bluetooth must be enabled for these APIs */
    /* Configure DUT Mode - Use this mode to enter/exit DUT mode */
    int (*dut_mode_configure)(uint8_t enable);
 
    /* Send any test HCI (vendor-specific) command to the controller. Must be in DUT Mode */
    int (*dut_mode_send)(uint16_t opcode, uint8_t *buf, uint8_t len);
    /** BLE Test Mode APIs */
    /* opcode MUST be one of: LE_Receiver_Test, LE_Transmitter_Test, LE_Test_End */
    int (*le_test_mode)(uint16_t opcode, uint8_t *buf, uint8_t len);
 
    /** Sets the OS call-out functions that bluedroid needs for alarms and wake locks.
* This should be called immediately after a successful |init|.
*/
    int (*set_os_callouts)(bt_os_callouts_t *callouts);
 
    /** Read Energy info details - return value indicates BT_STATUS_SUCCESS or BT_STATUS_NOT_READY
* Success indicates that the VSC command was sent to controller
*/
    int (*read_energy_info)();
 
    /**
* Native support for dumpsys function
* Function is synchronous and |fd| is owned by caller.
* |arguments| are arguments which may affect the output, encoded as
* UTF-8 strings.
*/
    void (*dump)(int fd, const char **arguments);
 
    /**
* Clear /data/misc/bt_config.conf and erase all stored connections
*/
    int (*config_clear)(void);
 
    /**
* Clear (reset) the dynamic portion of the device interoperability database.
*/
    void (*interop_database_clear)(void);
 
    /**
* Add a new device interoperability workaround for a remote device whose
* first |len| bytes of the its device address match |addr|.
* NOTE: |feature| has to match an item defined in interop_feature_t (interop.h).
*/
    void (*interop_database_add)(uint16_t feature, const RawAddress *addr, size_t len);
} bt_interface_t;

这个enable是调用libbluetooth.so中的enable，也就是bluedroid bluetooth.cc或者android8之前的bluetooth.c


static int enable() {
    if (!interface_ready()) return BT_STATUS_NOT_READY;
 
    stack_manager_get_interface()->start_up_stack_async();
    return BT_STATUS_SUCCESS;
}

然后就是走bluedroid流程了，host的初始化流程可以看我协议栈的其他文章

步骤7：底层bluedroid enable成功后回调处理

bluedroid底层enable跟controller交互成功后，调用这个函数，通过HAL_CBACK回调到bt service apk的jni


static void event_signal_stack_up(UNUSED_ATTR void* context) {
  // Notify BTIF connect queue that we've brought up the stack. It's
  // now time to dispatch all the pending profile connect requests.
  btif_queue_connect_next();
  HAL_CBACK(bt_hal_cbacks, adapter_state_changed_cb, BT_STATE_ON);
}

思考：为什么能调用到callback呢？

是因为adapterService 服务启动的时候调用到onCreate方法，里面有


public void onCreate() {
    super.onCreate();
    debugLog("onCreate()");
    ...
    // 调用jni的方法
    initNative(isGuest(), isNiapMode(), configCompareResult, isAtvDevice);
    ...
}


static bool initNative(JNIEnv* env, jobject obj, jboolean isGuest,
                       jboolean isNiapMode, int configCompareResult,
                       jboolean isAtvDevice) {
    ALOGV("%s", __func__);
 
    // 注册jni的callback到bluedroid，bluedroid有回调的时候回调用到sBluetoothCallbacks
    int ret = sBluetoothInterface->init(
      &sBluetoothCallbacks, isGuest == JNI_TRUE ? 1 : 0,
      isNiapMode == JNI_TRUE ? 1 : 0, configCompareResult,
      isAtvDevice == JNI_TRUE ? 1 : 0);
    if (ret != BT_STATUS_SUCCESS) {
      ALOGE("Error while setting the callbacks: %d\n", ret);
      sBluetoothInterface = NULL;
      return JNI_FALSE;
  }
 
}

好了，回归会提，如果bluedroid enable成功后，会调用到sBluetoothCallbacks的adapter_state_change_callback函数


static void adapter_state_change_callback(bt_state_t status) {
    ALOGE("Bluetooth adapter_state_change_callback:%d\n",status);
    
  CallbackEnv sCallbackEnv(__func__);
  if (!sCallbackEnv.valid()) return;
  ALOGV("%s: Status is: %d", __func__, status);
 
    // 通过jni的回调方法调用到AdapterService的stateChangeCallback
  sCallbackEnv->CallVoidMethod(sJniCallbacksObj, method_stateChangeCallback,
                               (jint)status);
}

步骤8：bt service的处理enable成功后的回调过程


void stateChangeCallback(int status) {
    Log.e(TAG, "stateChangeCallback:"+status);
 
    if (status == AbstractionLayer.BT_STATE_OFF) {
        debugLog("stateChangeCallback: disableNative() completed");
        mAdapterStateMachine.sendMessage(AdapterState.BLE_STOPPED);
    } else if (status == AbstractionLayer.BT_STATE_ON) {
        mAdapterStateMachine.sendMessage(AdapterState.BLE_STARTED);
    } else {
        Log.e(TAG, "Incorrect status " + status + " in stateChangeCallback");
    }
}

此时进入这个类中的processMessage处理


public boolean processMessage(Message msg) {
    switch (msg.what) {
        case BLE_STARTED:
            transitionTo(mBleOnState);
            break;
 
        case BLE_START_TIMEOUT:
            errorLog(messageString(msg.what));
            transitionTo(mTurningBleOffState);
            break;
 
        default:
            infoLog("Unhandled message - " + messageString(msg.what));
            return false;
    }
    return true;
}

迁徙到mBleOnState状态，然后处理，另外状态概念，会触发AdapterService.java中的updateAdapterState


void updateAdapterState(int prevState, int newState) {
    mAdapterProperties.setState(newState);
    invalidateBluetoothGetStateCache();
    if (mCallbacks != null) {
        int n = mCallbacks.beginBroadcast();
        debugLog("updateAdapterState() - Broadcasting state " + BluetoothAdapter.nameForState(
                newState) + " to " + n + " receivers.");
        for (int i = 0; i < n; i++) {
            try {
 
                mCallbacks.getBroadcastItem(i).onBluetoothStateChange(prevState, newState);
            } catch (RemoteException e) {
                debugLog("updateAdapterState() - Callback #" + i + " failed (" + e + ")");
            }
        }
        mCallbacks.finishBroadcast();
    }
 
    ....
}


private final IBluetoothCallback mBluetoothCallback = new IBluetoothCallback.Stub() {
    @Override
    public void onBluetoothStateChange(int prevState, int newState) throws RemoteException {
        Message msg =
                mHandler.obtainMessage(MESSAGE_BLUETOOTH_STATE_CHANGE, prevState, newState);
        mHandler.sendMessage(msg);
    }
};

case处理


case MESSAGE_BLUETOOTH_STATE_CHANGE: {
 
 
    ....
    bluetoothStateChangeHandler(prevState, newState);
 
    break;
}


private void bluetoothStateChangeHandler(int prevState, int newState) {
    
    if (newState == BluetoothAdapter.STATE_BLE_ON || newState == BluetoothAdapter.STATE_OFF) {
            .......
            continueFromBleOnState();
    }
 
}


private void continueFromBleOnState() {
    ...
    mBluetooth.onLeServiceUp();
    ...
}


public void onLeServiceUp() {
    AdapterService service = getService();
    if (service == null || !callerIsSystemOrActiveUser(TAG, "onLeServiceUp")) {
        return;
    }
 
    enforceBluetoothPrivilegedPermission(service);
 
    service.mAdapterStateMachine.sendMessage(AdapterState.USER_TURN_ON);
}


private class BleOnState extends BaseAdapterState {
 
    @Override
    int getStateValue() {
        return BluetoothAdapter.STATE_BLE_ON;
    }
 
    @Override
    public boolean processMessage(Message msg) {
        switch (msg.what) {
            case USER_TURN_ON:
                transitionTo(mTurningOnState);
                break;
 
            case BLE_TURN_OFF:
                transitionTo(mTurningBleOffState);
                break;
 
            default:
                infoLog("Unhandled message - " + messageString(msg.what));
                return false;
        }
        return true;
    }
}

然后进入到TurningOnState class的enter处理


public void enter() {
    super.enter();
    sendMessageDelayed(BREDR_START_TIMEOUT, BREDR_START_TIMEOUT_DELAY);
    mAdapterService.startProfileServices();
}

步骤9：开启所有profile的service


void startProfileServices() {
    ...
    setAllProfileServiceStates(supportedProfileServices, BluetoothAdapter.STATE_ON);
    
}


private static final ProfileConfig[] PROFILE_SERVICES_AND_FLAGS = {
            new ProfileConfig(HeadsetService.class, R.bool.profile_supported_hs_hfp,
                    (1 << BluetoothProfile.HEADSET)),
            new ProfileConfig(A2dpService.class, R.bool.profile_supported_a2dp,
                    (1 << BluetoothProfile.A2DP)),
            new ProfileConfig(A2dpSinkService.class, R.bool.profile_supported_a2dp_sink,
                    (1 << BluetoothProfile.A2DP_SINK)),
            new ProfileConfig(HidHostService.class, R.bool.profile_supported_hid_host,
                    (1 << BluetoothProfile.HID_HOST)),
            new ProfileConfig(PanService.class, R.bool.profile_supported_pan,
                    (1 << BluetoothProfile.PAN)),
            new ProfileConfig(GattService.class, R.bool.profile_supported_gatt,
                    (1 << BluetoothProfile.GATT)),
            new ProfileConfig(BluetoothMapService.class, R.bool.profile_supported_map,
                    (1 << BluetoothProfile.MAP)),
            new ProfileConfig(HeadsetClientService.class, R.bool.profile_supported_hfpclient,
                    (1 << BluetoothProfile.HEADSET_CLIENT)),
            new ProfileConfig(AvrcpTargetService.class, R.bool.profile_supported_avrcp_target,
                    (1 << BluetoothProfile.AVRCP)),
            new ProfileConfig(AvrcpControllerService.class,
                    R.bool.profile_supported_avrcp_controller,
                    (1 << BluetoothProfile.AVRCP_CONTROLLER)),
            new ProfileConfig(SapService.class, R.bool.profile_supported_sap,
                    (1 << BluetoothProfile.SAP)),
            new ProfileConfig(PbapClientService.class, R.bool.profile_supported_pbapclient,
                    (1 << BluetoothProfile.PBAP_CLIENT)),
            new ProfileConfig(MapClientService.class, R.bool.profile_supported_mapmce,
                    (1 << BluetoothProfile.MAP_CLIENT)),
            new ProfileConfig(HidDeviceService.class, R.bool.profile_supported_hid_device,
                    (1 << BluetoothProfile.HID_DEVICE)),
            new ProfileConfig(BluetoothOppService.class, R.bool.profile_supported_opp,
                    (1 << BluetoothProfile.OPP)),
            new ProfileConfig(BluetoothPbapService.class, R.bool.profile_supported_pbap,
                    (1 << BluetoothProfile.PBAP)),
            new ProfileConfig(HearingAidService.class,
                    com.android.internal.R.bool.config_hearing_aid_profile_supported,
                    (1 << BluetoothProfile.HEARING_AID))
    };

因为我们之前在前面说过，开启成功后就会调用profileService change的消息，所以如下


 private void processProfileServiceStateChanged(ProfileService profile, int state) {
            switch (state) {
                case BluetoothAdapter.STATE_ON:
                        ........
                    if (GattService.class.getSimpleName().equals(profile.getName())) {
                        enableNative();
                    } else if (mRegisteredProfiles.size() == Config.getSupportedProfiles().length
                            && mRegisteredProfiles.size() == mRunningProfiles.size()) {  //所有ProfileService都启动完毕
                       .......
                        mAdapterStateMachine.sendMessage(AdapterState.BREDR_STARTED);
                    }
                    break;


public boolean processMessage(Message msg) {
    switch (msg.what) {
        case BREDR_STARTED:
            transitionTo(mOnState);
            break;
 
    }
    return true;
}


private void bluetoothStateChangeHandler(int prevState, int newState) {
    ...
    sendBluetoothStateCallback(isUp); //广播发出数据
    sendBleStateChanged(prevState, newState);
    ...
}

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