Solution code for Android Kotlin Fundamentals Codelab 4.1: Lifecycles and logging.

您将使用一款名为 DessertClicker 的初始应用。在此应用中，每当用户点按屏幕上的甜点时，该应用就会为用户“购买”相应甜点。应用会在布局中更新已购甜点的数量值，以及用户消费的总金额。

DessertClicker is a game about making desserts. Press the button, make a dessert, earn the big bucks.

You use this app in the course to explore the Android lifecycle and log messages to the Android console (Logcat).

You need to know:

• How to open, build, and run apps with Android Studio.
• What an activity is, and how to create one in your app.
• What the activity's onCreate() method does, and the kind of operations that are performed in that method.
• How to create layouts in your activity, and how to update a layout in runtime.

1. Download and run the app.

```
定义版本号
ext {
    navigationVersion = "2.3.0"
}
引入依赖'androidx.navigation.safeargs'
dependencies{
    implementation "androidx.navigation:navigation-fragment-ktx:$navigationVersion"
    implementation "androidx.navigation:navigation-ui-ktx:$navigationVersion"
}
运行时报错
Duplicate class androidx.lifecycle.ViewModelLazy found in modules 
lifecycle-viewmodel-2.4.0-runtime (androidx.lifecycle:lifecycle-viewmodel:2.4.0) and
lifecycle-viewmodel-ktx-2.2.0-runtime (androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0)
```
尝试以下方法来解决问题：

1.执行以下命令获取项目的依赖关系树：`./gradlew app:dependencies`
  -出现了关系树，但我看不明白，尝试删掉相冲突的依赖但仍没有解决问题最后选择放弃

2.检查项目中的其他依赖项，并确保它们与所需的 androidx.lifecycle 版本兼容。
 可以尝试更新这些依赖项的版本，以使用与 androidx.lifecycle:lifecycle-viewmodel:2.4.0 兼容的版本。
  -我将navigationVersion提升到2.5.0就可以运行成功
  

Text that is a quote

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• George Washington

• John Adams

• Thomas Jefferson

1. James Madison

2. James Monroe

3. John Quincy Adams

4. First list item

   • First nested list item
     • Second nested list item

• #739
• https://github.com/octo-org/octo-repo/issues/740
• Add delight to the experience when all tasks are complete 🎉

@octocat 👍 This PR looks great - it's ready to merge!

Here is a simple footnote¹.

A footnote can also have multiple lines².

Let's rename *our-new-project* to *our-old-project*.

   puts "Hello World"

```
Look! You can see my backticks.
```

require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html

Here is a simple flow chart:

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

This sentence uses $ delimiters to show math inline: $\sqrt{3x-1}+(1+x)^2$

$$\left( \sum_{k=1}^n a_k b_k \right)^2$$

https://github.com/github/docs/labels/enhancement