[英]android | BLE write value to characteristic
我在将值写入BLE特性时遇到问题。 我正确地发送了字节数组,但是主要部分未更改。 我的特征很少,阅读它们没有问题。 但是,向他们每个人写入新价值存在一个问题。 这是我的“阅读”部分:
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
super.onServicesDiscovered(gatt, status);
if (status == BluetoothGatt.GATT_SUCCESS) {
List<BluetoothGattService> services = gatt.getServices();
for (BluetoothGattService service : services) {
registerService(service);
characteristics = new ArrayList<BluetoothGattCharacteristic>();
characteristics.add(services.get(4).getCharacteristics().get(0));
characteristics.add(services.get(4).getCharacteristics().get(1));
characteristics.add(services.get(4).getCharacteristics().get(2));
characteristics.add(services.get(4).getCharacteristics().get(3));
characteristics.add(services.get(4).getCharacteristics().get(4));
characteristics.add(services.get(4).getCharacteristics().get(5));
characteristics.add(services.get(4).getCharacteristics().get(6));
characteristics.add(services.get(4).getCharacteristics().get(7));
characteristics.add(services.get(4).getCharacteristics().get(8));
characteristics.add(services.get(4).getCharacteristics().get(9));
characteristics.add(services.get(4).getCharacteristics().get(10));
characteristics.add(services.get(4).getCharacteristics().get(11));
characteristics.add(services.get(5).getCharacteristics().get(0));
characteristics.add(services.get(6).getCharacteristics().get(0));
if (Characteristics.PARAMETERS_SERVICE_UUID.equals(service.getUuid()))
registerParametersCharacteristics(characteristics);
Log.e(TAG, "onServicesDiscovered: " + service.getUuid() );
requesReadCharacteristics(gatt);
}
callback.connectedStateChanged(true);
} else
disconnect();
}
public void requesReadCharacteristics(BluetoothGatt gatt) {
if (characteristics.get(characteristics.size() - 1).getUuid().equals(Characteristics.TEMPERATURE_CHARACTERISTIC_UUID)) {
Log.e(TAG, "requesReadCharacteristics: TRUE");
}
if (characteristics.get(characteristics.size() - 1).getUuid().equals(Characteristics.ACCELEROMETER_CHARACTERISTIC_UUID)) {
Log.e(TAG, "requesReadCharacteristics: TRUE");
}
gatt.readCharacteristic(characteristics.get(characteristics.size() - 1));
}
为了给特性写新的值,我有方法:
public void setMajor(int major) {
byte[] bytes = new byte[]{(byte) (major & 0xFF), (byte) ((major >> 8) & 0xFF)};
if (majorCharacteristic != null) {
BluetoothCommunicationManager.getInstance().add(new WriteCharacteristicCommand(majorCharacteristic, bluetoothGatt, bytes));
Log.e(TAG, "setMajor:" + Arrays.toString(bytes));
}
else
Log.e(TAG, "setMajor: NU" + Arrays.toString(bytes));
}
和一个处理它的类:
public class WriteCharacteristicCommand implements BTLECommand {
private final BluetoothGatt gatt;
private final BluetoothGattCharacteristic characteristic;
private final byte[] value;
public WriteCharacteristicCommand(BluetoothGattCharacteristic characteristic, BluetoothGatt gatt, byte[] value) {
this.gatt = gatt;
this.characteristic = characteristic;
this.value = value;
}
@Override
public void process() {
characteristic.setValue(value);
gatt.writeCharacteristic(characteristic);
}
}
我在日志中发现,当我设置新值时,每个特性都将再次读取...两次,然后第三次读取,这是在重新设置旧值时。 奇怪,但是发生了什么。 知道我在做什么错吗? 提前致谢!
一次只能执行一项出色的GATT操作(读/写描述符/特征)。 您需要等待相应的完成回调(onCharacteristicRead等),直到您可以发送下一个请求为止。
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