// Copyright 2016 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "net/android/cellular_signal_strength.h" #include "jni/AndroidCellularSignalStrength_jni.h" namespace net { namespace android { namespace cellular_signal_strength { namespace { // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net enum CellularSignalStrengthError { // Value returned by CellularSignalStrength APIs when a valid value is // unavailable. This value is same as INT32_MIN, but the following code uses // the explicit value of INT32_MIN so that the auto-generated Java enums work // correctly. ERROR_NOT_SUPPORTED = -2147483648, }; static_assert( INT32_MIN == ERROR_NOT_SUPPORTED, "CellularSignalStrengthError.ERROR_NOT_SUPPORTED has unexpected value"); } // namespace base::Optional GetSignalStrengthLevel() { int32_t signal_strength_level = Java_AndroidCellularSignalStrength_getSignalStrengthLevel( base::android::AttachCurrentThread()); if (signal_strength_level == ERROR_NOT_SUPPORTED) return base::Optional(); DCHECK_LE(0, signal_strength_level); DCHECK_GE(4, signal_strength_level); return signal_strength_level; } } // namespace cellular_signal_strength } // namespace android } // namespace net