读取蓝牙传感器特性时,该值或测量值将存储在特性值中。我如何获得这样的字节值:

00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00


从传感器值?

/ ********编辑*********** /

@Vikram推荐以下内容:

        private void updateAdc3Values(BluetoothGattCharacteristic characteristic) {

        // Convert values if needed
        //double adc3 = SensorTagData.extractAdc3(characteristic);


/******** Used to get raw HEX value ********/

        byte[] ADCValue3 = characteristic.getValue();
        String adc3Hex = ADCValue3.toString()
                .replace("[", "")   //remove the right bracket
                .replace("]", ""); //remove the left bracket

//      Log.e("ADC3", "ADC CH3 characteristicvalue from TEST is " + adc3Hex);
//      Log.i("ADC3", "ADC Last 6CH3 characteristicvalue from TEST is " + adc3Hex.substring(adc3Hex.length() - 6));  //Prints last 6 of this string

        // Get UUID
        String ch3 = (String.valueOf(characteristic.getUuid()));
        String ch3UUID = ch3.substring(0, Math.min(ch3.length(), 8));
//      Log.d("ADC3", "ADC FIRST 6CH3 characteristicvalue from TEST is " + ch3.substring(0, Math.min(ch3.length(), 8)));  //Print first 6 of this string


        String adc3hex6 = adc3Hex.substring(adc3Hex.length() - 6);

        StringBuilder sb = new StringBuilder();
        for (byte b : ADCValue3) {
            if (sb.length() > 0) {
                sb.append(':');
                }
        sb.append(String.format("%02x", b)); }


        Log.w("ADC3", "StringBuilder " + sb);

/********  Used to get raw HEX value   ********/


    }


我基本上一直在使用不同类型的输出来尝试所有可能性。使用byte []特征值,我形成了不同类型的输出。忽略UUID,这只是证明这些值来自正确的通道。因此,我只是剪切了UUID以获取前6个字符,这证明了它来自的频道。

在上述情况下,以ADC3字节数组值开头的Log.i,此行记录了一个测量值:

B@42bc0738


然后在StringBuilder记录之后出现姐妹记录:

7a:17:d0:7f:ff:ff:21:b4:e1:80:00:00:a4:a6:f4:77:73:5e


这似乎是我想要的正确格式和值。现在是时候比较这些值了。

最佳答案

从评论转移:

OP正在从byte[]方法获取BluetoothGattCharacteristic#getValue()

要将代码格式化为所需格式,请使用以下代码段:

// Use StringBuilder so that we can go through the byte[]
// and append formatted text
StringBuilder sb = new StringBuilder();

for (byte b : byteArray) {
    if (sb.length() > 0) {
        sb.append(':');
    }

    sb.append(String.format("%02x", b));
}

07-24 09:47
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