android BLE 4.0 setCharacteristicNotification接收不到数据

问题描述 最近在开发android BLE  读写数据

但是向设备写数据很顺利,但是在接收设备传来的数据时,死活接收不到.

/**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
    
    }

上面这样写 是收不到数据的 ,主要是少加了mBluetoothGatt.writeDescriptor(descriptor);

下面是修改后的代码

/**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
//        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
        boolean isEnableNotification =  mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
        if(isEnableNotification) {
            List<BluetoothGattDescriptor> descriptorList = characteristic.getDescriptors();
            if(descriptorList != null && descriptorList.size() > 0) {
                for(BluetoothGattDescriptor descriptor : descriptorList) {
                    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
                    mBluetoothGatt.writeDescriptor(descriptor);
                }
            }
        }
    }

 如果 不是这种 情况接收不到数据就是另外一种可能了characteristic的 uuid设置不对

你可以看下 boolean isEnableNotification = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

返回的是false 还是true,

另外还会再写一篇关于蓝牙数据读写的文章