java - 低功耗蓝牙 Android Studio

Question

为什么不起作用？“#”正确发送但未读取(对方设备读取该字符并发送)。我认为我无法同时执行以下两个函数，但为什么？

    Read_Data.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //Write
            Data_BLE_Write("#");

            //Read
            Data_BLE_Read();

            Toast.makeText(getApplicationContext(), "Data !!", Toast.LENGTH_SHORT).show();
        }
    });

但是如果我用两个按钮将 Data_Ble_Read 和 Data_Ble_Write 分开，它就会运行，所以我不明白为什么？我的职能:

private void Data_BLE_Write(String Caract){
    if (mGattCharacteristics != null) {
        final BluetoothGattCharacteristic characteristic_W =
                mGattCharacteristics.get(3).get(1);
        final int charaProp = characteristic_W.getProperties();

        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
            mNotifyCharacteristic = characteristic_W;
            mBluetoothLeService.setCharacteristicNotification(
                    characteristic_W, true);
        }
        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_WRITE) > 0) {
            String str = Caract;
            byte[] strBytes = str.getBytes();
            characteristic_W.setValue(strBytes);
            mBluetoothLeService.writeCaracteristic(characteristic_W);
        }
    }
}
    private String Data_BLE_Read(){
    Data_Read_Ble = "";
    if (mGattCharacteristics != null) {
        final BluetoothGattCharacteristic characteristic =
                mGattCharacteristics.get(2).get(6);
        final int charaProp = characteristic.getProperties();
        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
            // If there is an active notification on a characteristic, clear
            // it first so it doesn't update the data field on the user interface.
            if (mNotifyCharacteristic != null) {
                mBluetoothLeService.setCharacteristicNotification(
                        mNotifyCharacteristic, false);
                mNotifyCharacteristic = null;
            }
            mBluetoothLeService.readCharacteristic(characteristic);
        }
        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
            mNotifyCharacteristic = characteristic;
            mBluetoothLeService.setCharacteristicNotification(
                    characteristic, true);
        }
        Data_BLE_Write("&");
    }
    return Data_Read_Ble;
}

Answer 1

ble 堆栈只允许同时执行一个任务，因此基本上您是在中止写入任务和读取任务。您应该等待下一个任务，直到之前的任务完成，在您的情况下，您应该等到读取属性，然后再开始写入。

希望这有帮助。