一.单例模式+策略模式+构建者模式

设计模式传送门

二.日志模块封装

默认情况下我们的日志只能打印输出，没有永久保存，这里我们的日志不仅能log输出还要能上传到网络，邮件或者本地存储，下面我们进行简单的封装，这里涉及到kotlin基础以及单例模式/策略模式/构建者模式

1.日志等级：LoggerLevel枚举类

/**
 * @Author : ytx
 * @Time : On 2023/5/21 15:23
 * @Description : LoggerLevel 日志等级
 */
enum class LoggerLevel(var value: Int) {
    Verbose(1),
    Debug(2),
    Info(3),
    Warn(4),
    Error(5)
}

2.日志输出类型：LoggerType枚举类

/**
 * @Author : ytx
 * @Time : On 2023/5/21 15:36
 * @Description : LoggerType 日志输出类型：logcat/文件/邮件/网络
 */
enum class LoggerType {
    LOGCAT,FILE,EMAIL,NET
}

3.ILogger接口

/**
 * @Author : ytx
 * @Time : On 2023/5/21 15:18
 * @Description : ILogger：所有logger顶层接口
 */
interface ILogger {
    fun d(tag:String,log:String)
    fun v(tag:String,log:String)
    fun i(tag:String,log:String)
    fun w(tag:String,log:String)
    fun e(tag:String,log:String)
    /**
     * 是否Debug，开发阶段为true，上线阶段为false
     */
    fun setDebug(isDeug:Boolean)

    /**
     * 默认TAG
     */
    fun setLogTAG(TAG:String)
    /**
     * 默认日志等级
     */
    fun setLoggerLevel(level:LoggerLevel)
    /**
     * Log存储位置，可以是本地路径 可以是网络路径 可以是Email地址
     */
    fun setSaveUrl(url:String)
}

4.LogCatLogger/FileLogger/NetWorkLogger/EmailLogger

创建logger包，下面分别对应4种不同方式，以LogCatLogger为案例

/**
 * @Author : ytx
 * @Time : On 2023/5/21 15:26
 * @Description : LogcatLogger：打印输出log
 */
class LogcatLogger: ILogger {
    private var isDebug = true
    private var TAG = ""
    private var level = LoggerLevel.Debug
    private var loggerFormat = "(:=>$TAG %s -->%s"
    private var url = ""
    override fun d(tag: String, log: String) {
        if(isDebug && level.ordinal >= LoggerLevel.Debug.ordinal){
            Log.d(TAG,String.format(loggerFormat,tag,log))
        }
    }

    override fun v(tag: String, log: String) {
        if(isDebug && level.ordinal >= LoggerLevel.Verbose.ordinal){
            Log.v(TAG,String.format(loggerFormat,tag,log))
        }
    }

    override fun i(tag: String, log: String) {
        if(isDebug && level.ordinal >= LoggerLevel.Info.ordinal){
            Log.i(TAG,String.format(loggerFormat,tag,log))
        }
    }

    override fun w(tag: String, log: String) {
        if(isDebug && level.ordinal >= LoggerLevel.Warn.ordinal){
            Log.w(TAG,String.format(loggerFormat,tag,log))
        }
    }

    override fun e(tag: String, log: String) {
        if(isDebug && level.ordinal >= LoggerLevel.Error.ordinal){
            Log.e(TAG,String.format(loggerFormat,tag,log))
        }
    }

    override fun setDebug(isDebug: Boolean) {
        this.isDebug = isDebug
    }

    override fun setLogTAG(TAG: String) {
       this.TAG = TAG
    }

    override fun setLoggerLevel(level: LoggerLevel) {
        this.level = level
    }

    override fun setSaveUrl(url: String) {
        this.url = url
    }
}

5.使用构建者模式创建对应的logger对象

/**
 * @Author : ytx
 * @Time : On 2023/5/21 15:37
 * @Description : Logger创建对应的logger对象
 */
class Logger private constructor (private val TAG:String, private val level:LoggerLevel,private val loggerType: LoggerType, private val isDebug:Boolean, private val saveUrl:String) {
    private var logger:ILogger
    init {
        logger = getLogger()
    }

    /**
     * 创建Logger
     */
    fun getLogger():ILogger{
        when(loggerType){
            LoggerType.EMAIL -> throw IllegalArgumentException("该方案未实现")
            LoggerType.FILE -> throw IllegalArgumentException("该方案未实现")
            LoggerType.NET -> throw IllegalArgumentException("该方案未实现")
            LoggerType.LOGCAT -> logger = LogcatLogger()
        }
        logger.setLoggerLevel(level)
        logger.setLogTAG(TAG)
        logger.setDebug(isDebug)
        logger.setSaveUrl(saveUrl)
        return logger
    }

    /**
     * 输出Debug log
     */
    fun d(Tag:String,log:String){
        logger.d(Tag,log)
    }

    /**
     * 输出Warn log
     */
    fun w(Tag:String,log:String){
        logger.w(Tag,log)
    }

    /**
     * 输出Verbose log
     */
    fun v(Tag:String,log:String){
        logger.v(Tag,log)
    }

    /**
     * 输出Error log
     */
    fun e(Tag:String,log:String){
        logger.e(Tag,log)
    }
    /**
     * 输出Info log
     */
    fun i(Tag:String,log:String){
        logger.i(Tag,log)
    }



    class Builder(private var TAG:String = "", var level:LoggerLevel = LoggerLevel.Debug, private var loggerType: LoggerType = LoggerType.LOGCAT, var isDebug:Boolean = true, private var saveUrl:String = "" ){


        fun setTAG(TAG:String):Builder{
                this.TAG = TAG
                return this
            }
            fun setLevel(level:LoggerLevel):Builder{
                this.level = level
                return this
            }

            fun setLoggerType(loggerType: LoggerType):Builder{
                this.loggerType = loggerType
                return this
            }

            fun isDebug(isDebug: Boolean):Builder{
                this.isDebug = isDebug
                return this
            }


            fun setSaveUrl(saveUrl: String):Builder{
                this.saveUrl = saveUrl
                return this
            }

            fun build():Logger{
                return Logger(
                    TAG,
                    level,
                    loggerType,
                    isDebug,
                    saveUrl
                )
            }
        }
}

6.最后使用

  var logger = Logger.Builder()
            .setLevel(LoggerLevel.Error)
            .setLoggerType(LoggerType.LOGCAT)
            .isDebug(false)//true打印 false不打印
            .setTAG("2010")
            .build()
        logger.e("MainActivity","hahaha")

可以使用单例模式对log日志的进一步封装

三.bugly的使用

1.什么是Bugly

腾讯Bugly，为移动开发者提供专业的异常上报和运营统计，帮助开发者快速发现并
解决异常，同时掌握产品运营动态，及时跟进用户反馈。

2.集成Bugly

https://bugly.qq.com/docs/user-guide/instruction-manual-android/?v=1.0.0

3.如何创建Bugly产品

https://bugly.qq.com/v2/workbench/apps

4.面试问题难点：如果项目混淆后如何准确定位到错误的信息

使用mapping和符号表上传工具