Android 蓝牙BLE 4.0 属性判断

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) {

        }

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