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: 前言一直听说 android studio 的 layout 设计是真的好用，今天又学习了 layout 设计，顺便也捣鼓了下 java 语言的运用（不得不说，换了博客模板真的非常漂亮，犹豫着选它的原因就是因为漂亮多了，. Android studio includes a layout editor that allows you to build and layout your ui by dragging and dropping ui elements into a visual design editor instead of writing layout xml by hand. All of the activities you use in an android application have to be declared in the manifest file. This is to allow the android operating system to know which activities are available and which one to launch when your application starts. To declare an activity in the manifest file, you need to add a element inside the element, like this: In the example above, three activities are declared: MainActivity, SecondActivity, and ThirdActivity. These activities should be available in the same package as the manifest file. To add attributes to the element, you can use the android: prefix. Some common attributes that you may want to include are: - android:label: This specifies the label to be displayed for the activity in the app launcher. - android:icon: This specifies the icon to be displayed for the activity in the app launcher. - android:parentActivityName: This specifies the name of the parent activity of the current activity. This is useful for creating a back button on the action bar. For example, to add a label and an icon to the MainActivity, you can use the following: You can also specify intent filters for an activity in the manifest file. This allows your application to respond to specific actions or data types. For example, you can declare an activity to handle the action VIEW for a specific data type, such as a web link. In the example above, the WebActivity is set as the main activity with the action VIEW and data type of http://www.example.com. This means that when a user clicks on a link with this URL, the WebActivity will be launched. In summary, the manifest file is an important part of an android application as it declares all the activities that are available and allows your application to respond to specific actions or data types. It is important to keep the manifest file updated when you add new activities to your application.