我正在使用我的应用程序中的BLE连接。我只有一个用于蓝牙功能的类，并且正在传递来自其他片段类的命令以写入任何值。
因此，根据场景，在片段内，单击按钮将向蓝牙类发送写命令。第一次工作正常，我得到了回应。但是在第二次单击按钮时，两次调用onCharacteristicChanged（），第三次单击使它被调用三次，依此类推。我真的无法弄清楚。我将在下面发布我的代码。请看一看。如有任何疑问，请告诉我。提前致谢。
我在OnDescriptorWrite（）里面写数据，在那里接收数据
onCharacteristicChanged（）。
片段内部：
rvw_availableList.addOnItemTouchListener((
new RecyclerItemClickListener(myContext, new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position)
{
BluetoothDevice bl_device = al_deviceList.get(position);
bleUtil.writeData(bl_device,"3AxxxxxxD");
}
})
));
现在在BleUtil类的writeData（）中：
public void writeData(BluetoothDevice bluetoothDevice, final String value)
{
BluetoothGattCallback gattCallback =
new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
gatt.discoverServices();
}
@Override
public void onServicesDiscovered(final BluetoothGatt gatt, final int status) {
activity.runOnUiThread(new Runnable() {
public void run() {
// prgd_progress.HideProgressDialog();
Log.d("onServicesDiscovered", "Service uuid ");
List<BluetoothGattService> gattServices = gatt.getServices();
Log.d("onServicesDiscovered", "Services count: "+gattServices.size());
for (BluetoothGattService gattService: gattServices)
{
Log.d("aniservice",gattService.getUuid().toString());
}
if (status == BluetoothGatt.GATT_SUCCESS) {
ArrayList<String> alst_uuid = new ArrayList<String>();
BluetoothGattCharacteristic characteristic =
gatt.getService(UUID.fromString(SERVICE_ID)).getCharacteristics().get(0);
Log.d("anicheck",characteristic.getUuid().toString());
Log.d("anicheck",characteristic.getDescriptors().get(0).getUuid().toString());
// BluetoothGattCharacteristic characteristic =
// gattServices.get(0).getCharacteristics().get(0);
// Log.d("foundoutchar",gattServices.get(0).getUuid()+" "+gattServices.get(0).getCharacteristics().get(0).getUuid()+"");
gatt.setCharacteristicNotification(characteristic,true);
for (BluetoothGattDescriptor descriptor:characteristic.getDescriptors()){
Log.e("anicheck", "BluetoothGattDescriptor: "+descriptor.getUuid().toString());
}
final BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
if(descriptor!= null)
{
descriptor.setValue(
BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
gatt.writeDescriptor(descriptor);
}
else
{
Toast.makeText(activity,"nullval", Toast.LENGTH_SHORT).show();
}
// Log.d("foundoutchar", descriptor.getUuid().toString());
}
}
});
}
@Override
public void onCharacteristicWrite(final BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, final int status) {
super.onCharacteristicWrite(gatt, characteristic, status);
activity.runOnUiThread(new Runnable() {
public void run()
{
}
});
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic, int status)
{
Log.d("onCharacteristicread",characteristic.getValue().toString());
Log.d("onCharacteristicread","called");
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) {
super.onCharacteristicChanged(gatt, characteristic);
byte[] charValue = characteristic.getValue();
final String str_result = bytesToHex(charValue);
Log.d("onCharacteristicfullres",str_result);
final Intent intent = new Intent("ble_data"); //FILTER is a string to identify this intent
intent.putExtra("val", "getdeviceinfo");
intent.putExtra("data", str_result);
LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
activity.runOnUiThread(new Runnable() {
public void run()
{
// byte[] charValue = characteristic.getValue();
// String str_result = bytesToHex(charValue);
// Log.d("onCharacteristicfullres",str_result);
//Toast.makeText(activity, "On char changed "+str_result, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onDescriptorWrite(final BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status)
{
activity.runOnUiThread(new Runnable() {
public void run()
{
Log.d("oncharadesc","abcd");
// prgd_progress.HideProgressDialog();
BluetoothGattService service = gatt.getService(UUID.fromString(SERVICE_ID));
for (BluetoothGattCharacteristic characteristics: service.getCharacteristics())
{
Log.d("getit",characteristics.getUuid().toString());
}
final BluetoothGattCharacteristic characteristic =
gatt.getService(UUID.fromString(SERVICE_ID)).getCharacteristics().get(0);
byte[] byt_arr;
byt_arr = hexStringToByteArray(value);
characteristic.setValue(byt_arr);
gatt.writeCharacteristic(characteristic);
}
});
}
};
BluetoothGatt bluetoothGatt = bluetoothDevice.connectGatt(activity, true, gattCallback);
}
最佳答案
这是因为您多次调用connectGatt。每次调用connectGatt时，都会创建一个GATT客户端对象，以监听通知。因此，在三按之后，您将拥有三个处理所有通知的GATT客户端。
您应该更改代码，以便在写入数据时使用先前创建的GATT客户端。