| // 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 "net/net_jni_headers/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<int32_t> GetSignalStrengthLevel() { |
| int32_t signal_strength_level = |
| Java_AndroidCellularSignalStrength_getSignalStrengthLevel( |
| base::android::AttachCurrentThread()); |
| if (signal_strength_level == ERROR_NOT_SUPPORTED) |
| return base::nullopt; |
| |
| // |signal_strength_level| is expected to be between 0 and 4 (both inclusive). |
| // See |
| // https://developer.android.com/reference/android/telephony/SignalStrength.html#getLevel(). |
| // On some devices, |signal_strength_level| may have a value outside this |
| // range (e.g., see https://crbug.com/835701). For such devices, cap the value |
| // to be between 0 and 4. |
| if (signal_strength_level < 0) |
| return 0; |
| if (signal_strength_level > 4) |
| return 4; |
| |
| return signal_strength_level; |
| } |
| |
| } // namespace cellular_signal_strength |
| |
| } // namespace android |
| |
| } // namespace net |