| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.android.server.wifi.util; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| |
| import com.android.wifi.resources.R; |
| |
| /** Utilities for computations involving RSSI. */ |
| public class RssiUtil { |
| private RssiUtil() {} |
| |
| /** Calculate RSSI level from RSSI using overlaid RSSI level thresholds. */ |
| public static int calculateSignalLevel(Context context, int rssi) { |
| int[] thresholds = getRssiLevelThresholds(context); |
| |
| for (int level = 0; level < thresholds.length; level++) { |
| if (rssi < thresholds[level]) { |
| return level; |
| } |
| } |
| return thresholds.length; |
| } |
| |
| @NonNull |
| private static int[] getRssiLevelThresholds(Context context) { |
| // getIntArray() will never return null, it will throw instead |
| return context.getResources().getIntArray(R.array.config_wifiRssiLevelThresholds); |
| } |
| } |