问题描述
在尝试读取Android API 18中的蓝牙低功耗GATT特性的值时,遇到了以下难题:检索存储在特性中的值的正确方法是什么?以及该操作应在堆栈的哪个级别进行?
In attempting to read the value of a Bluetooth Low-Energy GATT characteristic in the Android API 18, I came across the following dilemma: What is the proper way to retrieve the value stored in a characteristic? And at which level of the stack should this action take place?
在进行自己的研究时,我偶然发现了我所知道的两种可能的方法:
In conducting my own research, I stumbled upon what I understand are two possible methods:
- BluetoothGatt .readCharacteristic(BluetoothGattCharacteristic特性)
-
BluetoothGattCharacteristic .getValue()
- BluetoothGatt.readCharacteristic(BluetoothGattCharacteristic characteristic)
BluetoothGattCharacteristic.getValue()
public void onClick(View v){
byteValue = mBTValueCharacteristic.getValue();
if ((byteValue[0] & 0x01) == 1)
byteValue[0] = 0x00;
else
byteValue[0] = 0x01;
mBTValueCharacteristic.setValue(byteValue);
mBTGatt.writeCharacteristic(mBTValueCharacteristic);
}
以上是原始内容代码导致我遇到这个问题。在其中,我尝试读取特征的值,并使用按钮简单地切换其状态。
Above is the original code which led me to this issue. In it, I attempt to read the value of a characteristic, and simply toggle its state using a button.
推荐答案
BluetoothGatt.readCharacteristic(BluetoothGattCharacteristic characteristic)
此函数正在更新您的BluetoothGattCharacteristic对象(在您的Android设备上)使用来自蓝牙的特征值。
This function is updating your BluetoothGattCharacteristic object (on your Android device) using characteristic value from the Bluetooth .
BluetoothGattCharacteristic.getValue()
此函数只是BluetoothGattCharacteristic对象的getter函数。 android和蓝牙设备之间没有任何交易。
This function is just a getter function of the BluetoothGattCharacteristic object. There is not any transaction between android and the bluetooth device.
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