开发者选项 选择日志级别 这个是个小米miui特有的选项，aosp里搜了下好像没有

"Developer options" "Select log level"

 

https://github.com/ingbrzy/Xiaomi.eu-MIUIv10-XML-Compare/blob/master/sakura/Settings.apk/res/values/strings.xml

https://github.com/ingbrzy/Xiaomi.eu-MIUIv11-XML-Compare/blob/master/davinci_stable/Settings.apk/res/values/arrays.xml

    <string-array name="select_logd_system_levels">
        <item>Off</item>
        <item>Error</item>
        <item>Warn</item>
        <item>Info</item>
        <item>Debug</item>
        <item>Verbose</item>
    </string-array>

 

    <!-- UI debug setting: limit size of Android logger buffers [CHAR LIMIT=59] -->
    <string name="select_logd_size_dialog_title">Select Logger sizes per log buffer</string>

 

 

 

https://www.apkmirror.com/apk/xiaomi-inc/settings-3/settings-3-10-release/settings-10-3-android-apk-download/

用mt逆向分析了一下设置apk

 

//
// Decompiled by Jadx - 706ms
//
package com.android.settings.development;

import android.content.Context;
import android.os.SystemProperties;
import android.text.TextUtils;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;
import com.android.settingslib.development.d;
import com.android.settingslib.miuisettings.preference.miuix.DropDownPreference;
import miui.os.Build;

public class Ma extends d implements Preference.b {
    private DropDownPreference TEc;

    public Ma(Context context) {
        super(context);
    }

    private void Ta(Object obj) {
        if (obj == null) {
            return;
        }
        String str = SystemProperties.get("persist.logd.limit", "");
        String obj2 = obj.toString();
        if (TextUtils.equals(str, obj2)) {
            return;
        }
        SystemProperties.set("persist.logd.limit", obj2);
        SystemProperties.set("ctl.start", "logd-reinit");
        tAa();
    }

    private void tAa() {
        if (this.TEc != null) {
            String str = SystemProperties.get("persist.logd.limit", "");
            if (TextUtils.isEmpty(str)) {
                str = Build.IS_STABLE_VERSION ? "Warn" : "Info";
            }
            this.TEc.setValue(str);
            this.TEc.setSummary(str);
            this.TEc.setOnPreferenceChangeListener(this);
        }
    }

    public void displayPreference(PreferenceScreen preferenceScreen) {
        super.displayPreference(preferenceScreen);
        this.TEc = preferenceScreen.findPreference("select_logd_system_level");
    }

    public String getPreferenceKey() {
        return "select_logd_system_level";
    }

    public boolean onPreferenceChange(Preference preference, Object obj) {
        Ta(obj);
        return true;
    }

    public void updateState(Preference preference) {
        super/*com.android.settingslib.d.a*/.updateState(preference);
        tAa();
    }
}

 

看代码大概意思就是设置了persist.logd.limit这个东西。但是我搜了搜没搜到什么关于这个的结果。

（根据一些搜索结果推测，这可能是小米特有的一个prop）

 

 

https://android.googlesource.com/platform/system/core/+/brillo-m8-dev/logd/README.property