在方法“ onCreate”中调用扩展PhoneStateListener的类

Question

我有一个手电筒应用程序，想在方法“ onCreate”中调用扩展PhoneStateListener的类

这里是我要呼叫的类..以便在来电时点亮闪光灯

我该怎么做？

---

 private class CallStateListener extends PhoneStateListener {
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            switch (state) {
                case TelephonyManager.CALL_STATE_RINGING:
                    // called when someone is ringing to this phone
                    getCamera();
                    turnOnFlash();

                    break;
            }
        }
    }