效果图

华为手机顶部状态栏

我们客制化后最终效果

实现步骤

1、获取蓝牙设备连接成功后的电量值

2、跟踪蓝牙图标显示流程

3、制作蓝牙带电量图标

4、获取电量后显示对应电量值图标

文件修改清单

 vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/ic_bluetooth_connected_super.xml                   vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_0.xml  vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_1.xml   vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_2.xml   vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_3.xml  vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_4.xml   vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/stat_sys_data_bluetooth_connected_battery_5.xml   vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java

除了 PhoneStatusBarPolicy.java 之外其余都是新增蓝牙图标相关资源文件，资源文件不再贴出，可以去这里下载

资源文件选用 xml path 绘制，好处就是能跟随系统状态栏切换背景色，如果采用 png 图片将需要处理监听状态栏底色改变

读取已连接蓝牙设备电量值，在网上搜索后找到了一个工具类，简单试了下发现可用，通过反射调用 BluetoothDevice 的

getBatteryLevel 方法获取电量值

private  int getBluetoothDeviceBattery(){int battery = -1;BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();Class<BluetoothAdapter> bluetoothAdapterClass = BluetoothAdapter.class;try {Method method = bluetoothAdapterClass.getDeclaredMethod("getConnectionState", (Class[]) null);method.setAccessible(true);int state = (int) method.invoke(btAdapter, (Object[]) null);if (state == BluetoothAdapter.STATE_CONNECTED) {Set<BluetoothDevice> devices = btAdapter.getBondedDevices();for (BluetoothDevice device : devices) {Method batteryMethod = BluetoothDevice.class.getDeclaredMethod("getBatteryLevel", (Class[]) null);batteryMethod.setAccessible(true);Method isConnectedMethod = BluetoothDevice.class.getDeclaredMethod("isConnected", (Class[]) null);isConnectedMethod.setAccessible(true);boolean isConnected = (boolean) isConnectedMethod.invoke(device, (Object[]) null);int level = (int) batteryMethod.invoke(device, (Object[]) null);if (device != null && level > 0 && isConnected) {String deviceName = device .getName();battery = level;android.util.Log.i(TAG, "Connected Bluetooth="+deviceName + "  battery="+level);}}} else {android.util.Log.e(TAG, "No Connected Bluetooth Devices Found");}} catch (Exception e) {e.printStackTrace();}finally{return battery;}}

电量值为 -1 说明蓝牙设备不支持读取电量

其实后来通过跟踪系统蓝牙连接界面显示电量值逻辑，最终找到的也是调用此方法获取电量

frameworks\base\packages\SettingsLib\src\com\android\settingslib\bluetooth\CachedBluetoothDevice.java

 /*** Return summary that describes connection state of this device. Summary depends on:* 1. Whether device has battery info* 2. Whether device is in active usage(or in phone call)** @param shortSummary {@code true} if need to return short version summary*/public String getConnectionSummary(boolean shortSummary) {boolean profileConnected = false;    // Updated as long as BluetoothProfile is connectedboolean a2dpConnected = true;        // A2DP is connectedboolean hfpConnected = true;         // HFP is connectedboolean hearingAidConnected = true;  // Hearing Aid is connectedint leftBattery = -1;int rightBattery = -1;.....String batteryLevelPercentageString = null;// Android framework should only set mBatteryLevel to valid range [0-100] or// BluetoothDevice.BATTERY_LEVEL_UNKNOWN, any other value should be a framework bug.// Thus assume here that if value is not BluetoothDevice.BATTERY_LEVEL_UNKNOWN, it must// be validfinal int batteryLevel = getBatteryLevel();if (batteryLevel != BluetoothDevice.BATTERY_LEVEL_UNKNOWN) {// TODO: name com.android.settingslib.bluetooth.Utils something differentbatteryLevelPercentageString =com.android.settingslib.Utils.formatPercentage(batteryLevel);}int stringRes = R.string.bluetooth_pairing;//when profile is connected, information would be availableif (profileConnected) {// Update Meta data for connected deviceif (BluetoothUtils.getBooleanMetaData(mDevice, BluetoothDevice.METADATA_IS_UNTETHERED_HEADSET)) {leftBattery = BluetoothUtils.getIntMetaData(mDevice,BluetoothDevice.METADATA_UNTETHERED_LEFT_BATTERY);rightBattery = BluetoothUtils.getIntMetaData(mDevice,BluetoothDevice.METADATA_UNTETHERED_RIGHT_BATTERY);}......
}/*** Get battery level from remote device* @return battery level in percentage [0-100], or {@link BluetoothDevice#BATTERY_LEVEL_UNKNOWN}*/public int getBatteryLevel() {//android.bluetooth.BluetoothDevice  mDevice;return mDevice.getBatteryLevel();}

通过跟踪发现控制蓝牙图标显示代码在 PhoneStatusBarPolicy.java 中，只有当蓝牙设备连接成功后蓝牙图标才会显示，

默认用的资源文件为 stat_sys_data_bluetooth_connected.xml,我们就可以在这块做调整，当蓝牙设备连接成功后读取电量值，

根据电量值获取对应电池格数资源文件就ok了。

vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java

 @Overridepublic void onBluetoothStateChange(boolean enabled) {updateBluetooth();}private final void updateBluetooth() {//int iconId = R.drawable.stat_sys_data_bluetooth_connected;int iconId = R.drawable.ic_bluetooth_connected_super;//cczheng changeString contentDescription =mContext.getString(R.string.accessibility_quick_settings_bluetooth_on);boolean bluetoothVisible = false;if (mBluetooth != null) {if (mBluetooth.isBluetoothConnected()) {contentDescription = mContext.getString(R.string.accessibility_bluetooth_connected);bluetoothVisible = mBluetooth.isBluetoothEnabled();}}//20200602 cczheng addif (bluetoothVisible) {int battery = getBluetoothDeviceBattery();if (battery > 0) {iconId = getBatteryLevelIconId(battery);}}//EmIconController.setIcon(mSlotBluetooth, iconId, contentDescription);mIconController.setIconVisibility(mSlotBluetooth, bluetoothVisible);}//20200602 cczheng add for show bt headset battery Sprivate int getBatteryLevelIconId(int battery){int iconId = 0;if (battery <= 10) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_0;}else if (battery <= 20) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_1;}else if (battery <= 40) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_2;}else if (battery <= 60) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_3;}else if (battery <= 80) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_4;}else if (battery <= 100) {iconId = R.drawable.stat_sys_data_bluetooth_connected_battery_5;}Log.e(TAG, "iconId="+iconId);return iconId;}private  int getBluetoothDeviceBattery(){int battery = -1;BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();Class<BluetoothAdapter> bluetoothAdapterClass = BluetoothAdapter.class;try {Method method = bluetoothAdapterClass.getDeclaredMethod("getConnectionState", (Class[]) null);method.setAccessible(true);int state = (int) method.invoke(btAdapter, (Object[]) null);if (state == BluetoothAdapter.STATE_CONNECTED) {Set<BluetoothDevice> devices = btAdapter.getBondedDevices();for (BluetoothDevice device : devices) {Method batteryMethod = BluetoothDevice.class.getDeclaredMethod("getBatteryLevel", (Class[]) null);batteryMethod.setAccessible(true);Method isConnectedMethod = BluetoothDevice.class.getDeclaredMethod("isConnected", (Class[]) null);isConnectedMethod.setAccessible(true);boolean isConnected = (boolean) isConnectedMethod.invoke(device, (Object[]) null);int level = (int) batteryMethod.invoke(device, (Object[]) null);if (device != null && level > 0 && isConnected) {String deviceName = device .getName();battery = level;android.util.Log.i(TAG, "Connected Bluetooth="+deviceName + "  battery="+level);}}} else {android.util.Log.e(TAG, "No Connected Bluetooth Devices Found");}} catch (Exception e) {e.printStackTrace();}finally{return battery;}}//20200602 cczheng add for show bt headset battery Eprivate final void updateTTY() {TelecomManager telecomManager =(TelecomManager) mContext.getSystemService(Context.TELECOM_SERVICE);if (telecomManager == null) {updateTTY(TelecomManager.TTY_MODE_OFF);} else {updateTTY(telecomManager.getCurrentTtyMode());}}

参考文章

Android 10 获取已连接的蓝牙设备的当前电量

Android7.0 获取蓝牙设备电量

androidQ(10.0) 读取蓝牙设备当前电量并显示相关推荐

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效果图

实现步骤

参考文章

androidQ(10.0) 读取蓝牙设备当前电量并显示相关推荐

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