蓝牙耳机电量显示

方案1只在连接耳机时获取到信息

方案2为：隔10%——20%左右接收到蓝牙耳机信息

方案1：

1.HeadsetStateMachine.java

    static {        classInitNative();        VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID = new HashMap<String, Integer>();        VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+XEVENT", BluetoothAssignedNumbers.PLANTRONICS);        VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+ANDROID", BluetoothAssignedNumbers.GOOGLE);// 添加以下两行        VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+XAPL", BluetoothAssignedNumbers.APPLE);        VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+IPHONEACCEV", BluetoothAssignedNumbers.APPLE);    }

2.PhoneStatusBarPolicy.java

import android.bluetooth.BluetoothAssignedNumbers;import android.bluetooth.BluetoothHeadset;   private Float mBluetoothBatteryLevel;public PhoneStatusBarPolicy(Context context, CastController cast, HotspotController hotspot,            UserInfoController userInfoController, BluetoothController bluetooth) {filter.addAction(BluetoothHeadset.ACTION_VENDOR_SPECIFIC_HEADSET_EVENT);            filter.addCategory(BluetoothHeadset.VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY + "." + BluetoothAssignedNumbers.APPLE);                mContext.registerReceiver(mIntentReceiver, filter, null, mHandler);    }    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            // 添加如下接收            else if (action.equals(BluetoothHeadset.ACTION_VENDOR_SPECIFIC_HEADSET_EVENT)) {                updateBluetoothBattery(intent);            }        }    };    private void updateBluetoothBattery(Intent intent) {        if (intent.hasExtra(BluetoothHeadset.EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD)) {            String command = intent.getStringExtra(BluetoothHeadset.EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD);            if ("+IPHONEACCEV".equals(command)) {                Object[] args = (Object[]) intent.getSerializableExtra(BluetoothHeadset.EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS);                if (args.length >= 3 && args[0] instanceof Integer && ((Integer)args[0])*2+1<=args.length) {                    for (int i=0;i<((Integer)args[0]);i++) {                        if (!(args[i*2+1] instanceof Integer) || !(args[i*2+2] instanceof Integer)) {                            continue;                        }                        if (args[i*2+1].equals(1)) {                            mBluetoothBatteryLevel = (((Integer)args[i*2+2])+1)/10.0f;                            updateBluetooth();                            break;                        }                    }                }            }        }    }    private final void updateBluetooth() {        int iconId = R.drawable.stat_sys_data_bluetooth;        String contentDescription =                mContext.getString(R.string.accessibility_quick_settings_bluetooth_on);        boolean bluetoothEnabled = false;        if (mBluetooth != null) {            bluetoothEnabled = mBluetooth.isBluetoothEnabled();            if (mBluetooth.isBluetoothConnected()) {                if (mBluetoothBatteryLevel == null) {                    iconId = R.drawable.stat_sys_data_bluetooth_connected;                } else {                    if (mBluetoothBatteryLevel <= 0.15f) {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_0;                    } else if (mBluetoothBatteryLevel <= 0.25f) {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_1;                    } else if (mBluetoothBatteryLevel <= 0.375f) {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_2;                    } else if (mBluetoothBatteryLevel <= 0.625f) {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_3;                    } else if (mBluetoothBatteryLevel <= 0.85f) {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_4;                    } else {                        iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_5;                    }                }                contentDescription = mContext.getString(R.string.accessibility_bluetooth_connected);            } else {                mBluetoothBatteryLevel = null;            }        }        mService.setIcon(SLOT_BLUETOOTH, iconId, 0, contentDescription);        mService.setIconVisibility(SLOT_BLUETOOTH, bluetoothEnabled);    }

如上，蓝牙耳机一般会针对 iOS 做定制。而没有针对Android做定制。

附上HFP命令AT+IPHONEACCEV

描述：报告耳机的状态变更发起者：耳机格式：AT+IPHONEACCEV=[Number of key/value pairs ],[key1 ],[val1 ],[key2 ],[val2 ],...参数：    Number of key/value pairs : 接下来参数的数量    key: 被报告状态变化的类型        1 = 电量等级        2 = 暂停状态    val: 更改的值        Battery events:0-9之间数字的字符串 A string value between '0' and '9'.        Dock state: 0 = undocked, 1 = docked.Example: AT+IPHONEACCEV=2,1,4,2,02：两个参数1，4     key值1代表电量：42，0     key值2代表：undocked

附上HFP  Command AT+XAPL

HFP命令AT+XAPL

    描述：允许通过耳机自定义AT命令
    发起者：耳机
    格式：AT+XAPL=[vendorID]-[productID]-[version],[features]
    参数：
        vendorID: 标识生产商的vendor ID的十六进制表示，但是没有0x前缀
        productID: 标识生产生的product ID的十六进制表示，但是没有0x前缀
        version: 软件的版本
        features: 用10进制标识的位标识:
            1 = 耳机支持电池电量报告
            2 = 耳机暂停或者正在充电
            其他值保留
    例子: AT+XAPL=ABCD-1234-0100,3
    响应: +XAPL=iPhone,[features]

方案2：

1.在HeadsetStateMachine.java文件中processUnknownAt方法中添加对此AT命令的处理函数如下：

else if (atCommand.startsWith("+IPHONEACCEV")){    processAtBattery(atString);}

processAtBattery(atString)为将获取到的attring解析并将电量以广播形式发出

private void processAtBattery(String atString) {    Log.i(TAG,"BlueToothBattery  atString:" + atString);// +IPHONEACCEV=2,1,4,2,0    String[] args  = atString.split("=")[1].split(",");    if (args.length >= 3  && (Integer.parseInt(args[0])*2+1) <= args.length) {        for (int i=0;i<Integer.parseInt(args[0]);i++) {            if (args[i*2+1].equals("1")) {                Float mBluetoothBatteryLevel = (Integer.parseInt(args[i*2+2])+1)/10.0f;                Intent intent = new Intent();                intent.setAction("action.bluetooth.battery.refresh");                intent.putExtra("BluetoothBatteryLevel",mBluetoothBatteryLevel);                mService.sendBroadcast(intent);                break;            }        }    }}

2.PhoneStatusBarPolicy.java中接收广播并做显示处理

filter.addAction("action.bluetooth.battery.refresh");

else if(action.equals("action.bluetooth.battery.refresh")){    Float mBluetoothBatteryLevel = intent.getFloatExtra("BluetoothBatteryLevel",0);    updateBluetoothBattery(mBluetoothBatteryLevel);}

private final void updateBluetoothBattery(Float mBluetoothBatteryLevel) {    int iconId = R.drawable.stat_sys_data_bluetooth;    String contentDescription =            mContext.getString(R.string.accessibility_quick_settings_bluetooth_on);    boolean bluetoothEnabled = false;    Log.d(TAG, "mBluetooth  = " + mBluetooth + "   mBluetooth.isBluetoothConnected():" + mBluetooth.isBluetoothConnected() +            "   mBluetoothBatteryLevel:" + mBluetoothBatteryLevel);    if (mBluetooth != null) {        bluetoothEnabled = mBluetooth.isBluetoothEnabled();        if (mBluetooth.isBluetoothConnected()) {            if (mBluetoothBatteryLevel == null) {                iconId = R.drawable.stat_sys_data_bluetooth_connected;            } else {                if (mBluetoothBatteryLevel <= 0.20f) {                    iconId = R.drawable.stat_sys_bluetooth_battery_1;                } else if (mBluetoothBatteryLevel <= 0.40f) {                    iconId = R.drawable.stat_sys_bluetooth_battery_2;                } else if (mBluetoothBatteryLevel <= 0.60f) {                    iconId = R.drawable.stat_sys_bluetooth_battery_3;                } else if (mBluetoothBatteryLevel <= 0.80f) {                    iconId = R.drawable.stat_sys_bluetooth_battery_4;                } else {                    iconId = R.drawable.stat_sys_bluetooth_battery_5;                }            }            contentDescription = mContext.getString(R.string.accessibility_bluetooth_connected);        } else {            mBluetoothBatteryLevel = null;        }    }    mService.setIcon(SLOT_BLUETOOTH, iconId, 0, contentDescription);    mService.setIconVisibility(SLOT_BLUETOOTH, bluetoothEnabled);}