问题
I am developing an application where I have to connect to Bluetooth device on Android 4.3.
And I want to get the battery level by using Battery_Service and Battery_Level.
public class BluetoothLeService extends Service {
private static final UUID Battery_Service_UUID =
UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb");
private static final UUID Battery_Level_UUID =
UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");
public void getbattery() {
BluetoothGattService batteryService = mBluetoothGatt.getService(Battery_Service_UUID);
if(batteryService == null) {
Log.d(TAG, "Battery service not found!");
return;
}
BluetoothGattCharacteristic batteryLevel = batteryService.getCharacteristic(Battery_Level_UUID);
if(batteryLevel == null) {
Log.d(TAG, "Battery level not found!");
return;
}
mBluetoothGatt.readCharacteristic(batteryLevel);
// What should I do that I can get the battery level ??
Log.d(TAG, "Battery level " + mBluetoothGatt.readCharacteristic(batteryLevel););
}
}
But the value of mBluetoothGatt.readCharacteristic(batteryLevel);
is not the battery level value
How to read the battery?
回答1:
I have solved this problem.
public class BluetoothLeService extends Service {
private static final UUID Battery_Service_UUID = UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb");
private static final UUID Battery_Level_UUID = UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
if(status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
}
}
private void broadcastUpdate(final String action, final BluetoothGattCharacteristic characteristic) {
final Intent intent = new Intent(action);
Log.v(TAG, "characteristic.getStringValue(0) = " + characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
intent.putExtra(DeviceControl.EXTRAS_DEVICE_BATTERY, characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
sendBroadcast(intent);
}
public void getbattery() {
BluetoothGattService batteryService = mBluetoothGatt.getService(Battery_Service_UUID);
if(batteryService == null) {
Log.d(TAG, "Battery service not found!");
return;
}
BluetoothGattCharacteristic batteryLevel = batteryService.getCharacteristic(Battery_Level_UUID);
if(batteryLevel == null) {
Log.d(TAG, "Battery level not found!");
return;
}
mBluetoothGatt.readCharacteristic(batteryLevel);
Log.v(TAG, "batteryLevel = " + mBluetoothGatt.readCharacteristic(batteryLevel));
}
}
When you call the function getbattery()
, it will call onCharacteristicRead
.
and onCharacteristicRead
will call broadcastUpdate
and transmit the characteristic and action to it.
And the characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0)
in broadcastUpdate is the battery value of the BLE device.
来源:https://stackoverflow.com/questions/19539535/how-to-get-the-battery-level-after-connect-to-the-ble-device