本文简单介绍如何判断蓝牙BLE4.0的 BluetoothGattCharacteristic 属性
1、先看UUID定义；
2、BluetoothGattCharacteristic的属性定义；
/**
- Characteristic proprty: Characteristic is broadcastable.
- 可以广播，二进制0001
*/
public static final int PROPERTY_BROADCAST = 0x01;
/** - Characteristic property: Characteristic is readable.
- 可读，二进制0010
*/
public static final int PROPERTY_READ = 0x02;
/** - Characteristic property: Characteristic can be written without response.
- 只可写，二进制0100
*/
public static final int PROPERTY_WRITE_NO_RESPONSE = 0x04;
/** - Characteristic property: Characteristic can be written.
- 可写，二进制1000
*/
public static final int PROPERTY_WRITE = 0x08;
/** - Characteristic property: Characteristic supports notification
- 支持通知，二进制0001 0000
*/
public static final int PROPERTY_NOTIFY = 0x10;
/** - Characteristic property: Characteristic supports indication
- 支持指示，二进制0010 0000
*/
public static final int PROPERTY_INDICATE = 0x20;
/** - Characteristic property: Characteristic supports write with signature
- 支持写签名，二进制0100 0000
*/
public static final int PROPERTY_SIGNED_WRITE = 0x40;
/** - Characteristic property: Characteristic has extended properties
- 可扩展属性，二进制1000 0000
*/
public static final int PROPERTY_EXTENDED_PROPS = 0x80;
3、由二进制得出其属性由八个标志位表示，拥有的属性值是相加的，所以可以用 & 方法判断其属性；
// 可读
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
}
// 可写，注：要 & 其可写的两个属性
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE) > 0
|| (charaProp & BluetoothGattCharacteristic.PROPERTY_WRITE) > 0) {
}
// 可通知，可指示
if ((charaProp & BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0
|| (charaProp & BluetoothGattCharacteristic.PROPERTY_INDICATE) > 0) {
}
欢迎加入“六度交流”
QQ群：174254613