Android 9.0 10蓝牙音乐获取歌手、歌曲等信息

Android 9.0中蓝牙音乐其实实现很简单，蓝牙远程服务处理在Bluetooth中。
修改代码路径：

android/packages/apps/Bluetooth./jni/com_android_bluetooth_avrcp_controller.cpp
android/packages/apps/Bluetooth/src/com/android/bluetooth/avrcpcontroller/AvrcpControllerService.java

1、在com_android_bluetooth_avrcp_controller.cpp中classInitNative方法中会会初始化一些方法，其中当播放音乐发生变化时候，会通过onTrackChanged方法回调给java层

static void classInitNative(JNIEnv* env, jclass clazz) {method_handletrackchanged =env->GetMethodID(clazz, "onTrackChanged", "([BB[I[Ljava/lang/String;)V");
}

2、在com_android_bluetooth_avrcp_controller.cpp中命名空间中会定义一些回调java层的方法

namespace android {
static jmethodID method_handlePassthroughRsp;
static jmethodID method_onConnectionStateChanged;
static jmethodID method_getRcFeatures;
static jmethodID method_setplayerappsettingrsp;
static jmethodID method_handleplayerappsetting;
static jmethodID method_handleplayerappsettingchanged;
static jmethodID method_handleSetAbsVolume;
static jmethodID method_handleRegisterNotificationAbsVol;
static jmethodID method_handletrackchanged;
static jmethodID method_handleplaypositionchanged;
static jmethodID method_handleplaystatuschanged;
static jmethodID method_handleGetFolderItemsRsp;
static jmethodID method_handleGetPlayerItemsRsp;
static jmethodID method_handleGroupNavigationRsp;
static jmethodID method_createFromNativeMediaItem;
static jmethodID method_createFromNativeFolderItem;
static jmethodID method_createFromNativePlayerItem;
static jmethodID method_handleChangeFolderRsp;
static jmethodID method_handleSetBrowsedPlayerRsp;
static jmethodID method_handleSetAddressedPlayerRsp;

3、在com_android_bluetooth_avrcp_controller.cpp中找到method_handletrackchanged方法实现的地方，该方法最后是通过该方法回调btavrcp_track_changed_callback

static void btavrcp_track_changed_callback(const RawAddress& bd_addr,uint8_t num_attr,btrc_element_attr_val_t* p_attrs) {/** byteArray will be formatted like this: id,len,string* Assuming text feild to be null terminated.*/ALOGI("%s", __func__);CallbackEnv sCallbackEnv(__func__);if (!sCallbackEnv.valid()) return;ScopedLocalRef<jbyteArray> addr(sCallbackEnv.get(), sCallbackEnv->NewByteArray(sizeof(RawAddress)));if (!addr.get()) {ALOGE("Fail to get new array ");return;}ScopedLocalRef<jintArray> attribIds(sCallbackEnv.get(),sCallbackEnv->NewIntArray(num_attr));if (!attribIds.get()) {ALOGE(" failed to set new array for attribIds");return;}sCallbackEnv->SetByteArrayRegion(addr.get(), 0, sizeof(RawAddress),(jbyte*)&bd_addr.address);jclass strclazz = sCallbackEnv->FindClass("java/lang/String");ScopedLocalRef<jobjectArray> stringArray(sCallbackEnv.get(),sCallbackEnv->NewObjectArray((jint)num_attr, strclazz, 0));if (!stringArray.get()) {ALOGE(" failed to get String array");return;}for (jint i = 0; i < num_attr; i++) {ScopedLocalRef<jstring> str(sCallbackEnv.get(),sCallbackEnv->NewStringUTF((char*)(p_attrs[i].text)));if (!str.get()) {ALOGE("Unable to get str");return;}sCallbackEnv->SetIntArrayRegion(attribIds.get(), i, 1,(jint*)&(p_attrs[i].attr_id));sCallbackEnv->SetObjectArrayElement(stringArray.get(), i, str.get());}sCallbackEnv->CallVoidMethod(sCallbacksObj, method_handletrackchanged,addr.get(), (jbyte)(num_attr), attribIds.get(),stringArray.get());
}

4、在com_android_bluetooth_avrcp_controller.cpp中sBluetoothAvrcpCallbacks方法会会定义一些回调给jiava层的方法

static btrc_ctrl_callbacks_t sBluetoothAvrcpCallbacks = {sizeof(sBluetoothAvrcpCallbacks),btavrcp_passthrough_response_callback,btavrcp_groupnavigation_response_callback,btavrcp_connection_state_callback,btavrcp_get_rcfeatures_callback,btavrcp_setplayerapplicationsetting_rsp_callback,btavrcp_playerapplicationsetting_callback,btavrcp_playerapplicationsetting_changed_callback,btavrcp_set_abs_vol_cmd_callback,btavrcp_register_notification_absvol_callback,btavrcp_track_changed_callback,btavrcp_play_position_changed_callback,btavrcp_play_status_changed_callback,btavrcp_get_folder_items_callback,btavrcp_change_path_callback,btavrcp_set_browsed_player_callback,btavrcp_set_addressed_player_callback};

5、在com_android_bluetooth_avrcp_controller.cpp中initNative方法会初始化一些回调函数

static void initNative(JNIEnv* env, jobject object) {jclass tmpMediaItem =env->FindClass("android/media/browse/MediaBrowser$MediaItem");class_MediaBrowser_MediaItem = (jclass)env->NewGlobalRef(tmpMediaItem);jclass tmpBtPlayer =env->FindClass("com/android/bluetooth/avrcpcontroller/AvrcpPlayer");class_AvrcpPlayer = (jclass)env->NewGlobalRef(tmpBtPlayer);const bt_interface_t* btInf = getBluetoothInterface();if (btInf == NULL) {ALOGE("Bluetooth module is not loaded");return;}if (sBluetoothAvrcpInterface != NULL) {ALOGW("Cleaning up Avrcp Interface before initializing...");sBluetoothAvrcpInterface->cleanup();sBluetoothAvrcpInterface = NULL;}if (sCallbacksObj != NULL) {ALOGW("Cleaning up Avrcp callback object");env->DeleteGlobalRef(sCallbacksObj);sCallbacksObj = NULL;}sBluetoothAvrcpInterface =(btrc_ctrl_interface_t*)btInf->get_profile_interface(BT_PROFILE_AV_RC_CTRL_ID);if (sBluetoothAvrcpInterface == NULL) {ALOGE("Failed to get Bluetooth Avrcp Controller Interface");return;}bt_status_t status =sBluetoothAvrcpInterface->init(&sBluetoothAvrcpCallbacks);//这里就是初始化一些回调函数if (status != BT_STATUS_SUCCESS) {ALOGE("Failed to initialize Bluetooth Avrcp Controller, status: %d",status);sBluetoothAvrcpInterface = NULL;return;}sCallbacksObj = env->NewGlobalRef(object);
}

6、AvrcpControllerService.java中找到onTrackChanged方法，该方法就是获取蓝牙音乐的一些信息

   private synchronized void onTrackChanged(byte[] address, byte numAttributes, int[] attributes,String[] attribVals) {if (DBG) {Log.d(TAG, "onTrackChanged");}BluetoothDevice device = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(address);if (device != null && !device.equals(mConnectedDevice)) {Log.e(TAG, "onTrackChanged device not found " + address);return;}//该方法就是把蓝牙音乐的信息传递给java层getElementAttrRsp(attributes,attribVals,numAttributes);List<Integer> attrList = new ArrayList<>();for (int attr : attributes) {attrList.add(attr);}List<String> attrValList = Arrays.asList(attribVals);TrackInfo trackInfo = new TrackInfo(attrList, attrValList);if (VDBG) {Log.d(TAG, "onTrackChanged " + trackInfo);}Message msg = mAvrcpCtSm.obtainMessage(AvrcpControllerStateMachine.MESSAGE_PROCESS_TRACK_CHANGED, trackInfo);mAvrcpCtSm.sendMessage(msg);}

7、AvrcpControllerService.java中找到onTrackChanged方法，然后在该方法中添加一个方法getElementAttrRsp(),这样就可以把音乐信息传递给java层

 private void getElementAttrRsp(int[] attr_id,String[] textArray,byte num_attr){String artist = null;String trackTitle = null;String album = null;for (int i = 0; i < num_attr; i++){switch (attr_id[i]) {case JNI_MEDIA_ATTR_ID_TITLE:trackTitle = textArray[i];if (trackTitle == null){trackTitle = "Unknown";}break;case JNI_MEDIA_ATTR_ID_ARTIST:artist = textArray[i];if (artist == null){artist = "Unknown";}break;case JNI_MEDIA_ATTR_ID_ALBUM:album = textArray[i];if (album == null){album = "Unknown";}break;}}Intent intent = new Intent("com.android.getelementattrrsp");intent.putExtra("artist", artist);intent.putExtra("trackTitle",trackTitle);intent.putExtra("album",album);Log.d(TAG,"getElementAttrRsp,artist: " + artist + ",trackTitle: " + trackTitle + ",album: " + album);intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);sendBroadcast(intent, ProfileService.BLUETOOTH_PERM);}

日志：

08-09 18:30:20.791  2576  2814 D wang  : onTrackChanged  attrValList 7
08-09 18:30:20.792  2576  2814 D wang  : onTrackChanged  attrValList [热爱105°C的你, 阿肆, 热爱105°C的你, 7, 100, , 195370]
08-09 18:30:20.821  2576  2814 D wang  : onTrackChanged  attrValList 7
08-09 18:30:20.821  2576  2814 D wang  : onTrackChanged  attrValList [热爱105°C的你, 阿肆, 热爱105°C的你, 7, 100, , 195370]
08-09 18:30:20.881  2576  2814 D wang  : onTrackChanged  attrValList 7
08-09 18:30:20.881  2576  2814 D wang  : onTrackChanged  attrValList [热爱105°C的你, 阿肆, 热爱105°C的你, 7, 100, , 195370]

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Android 9.0 10蓝牙音乐获取歌手、歌曲等信息

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