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58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
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// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/android/cellular_signal_strength.h"
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#include "jni/AndroidCellularSignalStrength_jni.h"
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namespace net {
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namespace android {
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namespace cellular_signal_strength {
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namespace {
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// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net
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enum CellularSignalStrengthError {
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// Value returned by CellularSignalStrength APIs when a valid value is
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// unavailable. This value is same as INT32_MIN, but the following code uses
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// the explicit value of INT32_MIN so that the auto-generated Java enums work
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// correctly.
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ERROR_NOT_SUPPORTED = -2147483648,
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};
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static_assert(
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INT32_MIN == ERROR_NOT_SUPPORTED,
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"CellularSignalStrengthError.ERROR_NOT_SUPPORTED has unexpected value");
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} // namespace
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base::Optional<int32_t> GetSignalStrengthLevel() {
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int32_t signal_strength_level =
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Java_AndroidCellularSignalStrength_getSignalStrengthLevel(
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base::android::AttachCurrentThread());
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if (signal_strength_level == ERROR_NOT_SUPPORTED)
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return base::nullopt;
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// |signal_strength_level| is expected to be between 0 and 4 (both inclusive).
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// See
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// https://developer.android.com/reference/android/telephony/SignalStrength.html#getLevel().
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// On some devices, |signal_strength_level| may have a value outside this
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// range (e.g., see https://crbug.com/835701). For such devices, cap the value
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// to be between 0 and 4.
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if (signal_strength_level < 0)
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return 0;
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if (signal_strength_level > 4)
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return 4;
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return signal_strength_level;
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}
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} // namespace cellular_signal_strength
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} // namespace android
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} // namespace net
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