标签：wifi return level int Wifi RSSI android 满格 阀值

要想wifi在信号比较差的时候也显示满格信号，可参考如下方法

http://aospxref.com/android-11.0.0_r21/xref/frameworks/base/wifi/java/android/net/wifi/WifiManager.java

    /** Anything worse than or equal to this will show 0 bars. */
    @UnsupportedAppUsage
    private static final int MIN_RSSI = -100;

    /** Anything better than or equal to this will show the max bars. */
    @UnsupportedAppUsage
    private static final int MAX_RSSI = -55;

    /**
     * Number of RSSI levels used in the framework to initiate {@link #RSSI_CHANGED_ACTION}
     * broadcast, where each level corresponds to a range of RSSI values.
     * The {@link #RSSI_CHANGED_ACTION} broadcast will only fire if the RSSI
     * change is significant enough to change the RSSI signal level.
     * @hide
     */
    @UnsupportedAppUsage
    public static final int RSSI_LEVELS = 5;

    /**
     * Calculates the level of the signal. This should be used any time a signal
     * is being shown.
     *
     * @param rssi The power of the signal measured in RSSI.
     * @param numLevels The number of levels to consider in the calculated level.
     * @return A level of the signal, given in the range of 0 to numLevels-1 (both inclusive).
     * @deprecated Callers should use {@link #calculateSignalLevel(int)} instead to get the
     * signal level using the system default RSSI thresholds, or otherwise compute the RSSI level
     * themselves using their own formula.
     */
    @Deprecated
    public static int calculateSignalLevel(int rssi, int numLevels) {
        if (rssi <= MIN_RSSI) {
            return 0;
        } else if (rssi >= MAX_RSSI) {
            return numLevels - 1;
        } else {
            float inputRange = (MAX_RSSI - MIN_RSSI);
            float outputRange = (numLevels - 1);
            return (int)((float)(rssi - MIN_RSSI) * outputRange / inputRange);
        }
    }

对于Android11，接口有变化

http://aospxref.com/android-11.0.0_r21/xref/frameworks/opt/net/wifi/service/java/com/android/server/wifi/util/RssiUtil.java

/*
 * 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);
    }
}

http://aospxref.com/android-11.0.0_r21/xref/frameworks/opt/net/wifi/service/res/values/config.xml

    <!--
    Controls the mapping between RSSI and RSSI levels.

    RSSI                                    RSSI Level
    (-infinity, thresholds[0])                       0
    [threshold[0], threshold[1])                     1
    [threshold[1], threshold[2])                     2
    ...                                            ...
    [threshold[len-2], threshold[len-1])         len-1
    [threshold[len-1], +infinity)                  len

    where:
        [a, b) is the range of integers `n` such that a <= n < b
        `threshold[i]` represents the i'th element of the config_wifiRssiLevelThresholds array
        and `len` is the length of the config_wifiRssiLevelThresholds array.
    -->
    <integer-array translatable="false" name="config_wifiRssiLevelThresholds">
                         <!-- RSSI                RSSI Level -->
        <item>-88</item> <!-- (-infinity, -88)             0 -->
        <item>-77</item> <!-- [-88, -77)                   1 -->
        <item>-66</item> <!-- [-77, -66)                   2 -->
        <item>-55</item> <!-- [-66, -55)                   3 -->
                         <!-- [-55, +infinity)             4 -->
    </integer-array>

如何确认修改有效，打开开发者选项，勾选开启wlan详细日记记录，然后到wifi的搜索界面上看下已连接wifi信号的rssi值，然后移动手机，看信号格数有没有符合要求。

标签：wifi,return,level,int,Wifi,RSSI,android,满格,阀值
来源： https://blog.csdn.net/mike8825/article/details/118856424

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