Android如何阅读BLE属性可读写可通报的GATT特性

Question

如何阅读BluetoothGattCharacteristic属性，如特征Readable ， Writable或Notifiable 。

Answer 1

    /**
     * @return Returns <b>true</b> if property is writable
     */
    public static boolean isCharacteristicWritable(BluetoothGattCharacteristic pChar) {
        return (pChar.getProperties() & (BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE)) != 0;
    }

    /**
     * @return Returns <b>true</b> if property is Readable
     */
    public static boolean isCharacteristicReadable(BluetoothGattCharacteristic pChar) {
        return ((pChar.getProperties() & BluetoothGattCharacteristic.PROPERTY_READ) != 0);
    }

    /**
     * @return Returns <b>true</b> if property is supports notification
     */
    public boolean isCharacteristicNotifiable(BluetoothGattCharacteristic pChar) {
        return (pChar.getProperties() & BluetoothGattCharacteristic.PROPERTY_NOTIFY) != 0;
    }

Answer 2

I ran into the similar problem where the sample code ONLY works when the characteristic is READ because of the operator "|". If the characteritic is of other types such as Notification or Write, the code will always set it sup as READ. The correct code should be as the following:

if((charaProp & BluetoothGattCharacteristic.PROPERTY_READ) > 0){ 

} else if(charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFICATION) > 0){
}

(...Continue with other cases)

Again, the google sample code is NOT correct.

David