onServicesDiscovered never called while connecting to GATT Server

Question

I have a bluetooth headset which is paired with my Nexus 5X (running Android 7.1) and I would like to connect to a GATT Server of the headset. I tried it with the following

Answer 1

In fact，I solve this problem by Execution the method mBluetoothGatt.discoverServices() several times（10 or more），

    int i = 10;
    while (i > 0)
    {
        if (!mIsBLE_Finded)  //如果服务发现失败,继续执行discoverServices方法
        {
            i--;
            mBluetoothGatt.discoverServices();
            System.out.println("BLEService-->" + "尝试次数:" + i);
        }
        else //在10次的尝试中，存在某次服务发现成功了
        {
            i = -1;
        }
    }