如何在android中获取左右耳塞的电池电量

Question

我想创建一个应用程序，使用 Java 在 android 中显示左右耳塞的电池电量 我已经尝试过该代码

BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
Method m = device.getClass().getMethod("getBatteryLevel");
int batteryLevel = m.invoke(device);

但是在这个方法中，我总是只能获得一个电池电量，而不是两者，而且我不知道如何获得两个电池电量，所以我需要你的帮助来获取 Android 中左耳塞和右耳塞的电池电量。

Answer 1

要使用 Java 找出 Android 中左右耳塞的电池电量，您需要使用蓝牙低功耗 (BLE) 协议，因为大多数现代无线耳塞通过 BLE 传达电池信息。 以下是您需要遵循的步骤的总体概述： 确保您在 AndroidManifest.xml 中拥有必要的权限

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>
<uses-permission android:name="android.permission.BATTERY_STATS"/>

然后您需要引用BluetoothAdapter并发现蓝牙设备。

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();

for (BluetoothDevice device : pairedDevices) {
    // Check if the device name or address matches your earbuds
    if (device.getName().equals("YourBlutoothDeviceName") || device.getAddress().equals("LeftEarbudMACAddress")) {
        // You found the left earbud, proceed to get its battery level.
        // Repeat this for the right earbud if needed.
    }
}

然后要确定电池电量，需要连接耳机，然后查询蓝牙GATT电池服务。

BluetoothGatt gatt = device.connectGatt(context, false, gattCallback);

// Define a BluetoothGattCallback to handle GATT events
BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            // Once connected, discover services
            gatt.discoverServices();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            // Find the Battery Service
            BluetoothGattService batteryService = gatt.getService(UUID.fromString("0000180f-0000-1000-8000-00805f9b34fb"));

            if (batteryService != null) {
                // Find the Battery Level Characteristic
                BluetoothGattCharacteristic batteryLevelCharacteristic = batteryService.getCharacteristic(UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb"));

                if (batteryLevelCharacteristic != null) {
                    // Read the battery level
                    gatt.readCharacteristic(batteryLevelCharacteristic);
                }
            }
        }
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            // Extract the battery level value from the characteristic
            int batteryLevel = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
            // Handle the battery level value (e.g., display it in your UI)
        }
        // Disconnect the GATT connection when you're done
        gatt.disconnect();
    }
};

还要让电池设备离开，您需要使用以下方法

float getBatteryLevel() {
    IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = registerReceiver(null, filter);
    float batteryLevel = 0.0f if (batteryStatus != null) {
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        batteryLevel = (level / (float) scale) * 100;
    }
    return batteryLevel;
}

参考文献 https://developer.android.com/guide/topics/connectivity/bluetooth/ble-overview

Android 和低功耗蓝牙 (BLE)