Android Studio Essentials by Belen Cruz Zapata

By Belen Cruz Zapata

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The next screenshot shows that if we switch to the graphical editor, the button is displayed in it and also in Component Tree: Supporting multiple screens When creating Android applications, we have to take into account the existence of multiple screen sizes and screen resolutions. It is important to check how our layouts are displayed in different screen configurations. To accomplish this, Android Studio provides a functionality to change the virtual device that renders the layout preview when we are in the Design mode.

For example, we can override the values of the package name, the minimum SDK, or the target SDK. These configurations are defined under the android/ defaultConfig tags. • Signing: We can activate the application signing for the release version. The build system uses a default certificate to sign the debug version of the application. We can configure our key and certificate to sign the release version as well. These configurations are defined under the android/ signingConfigs tags. [ 28 ] Chapter 3 Project settings You can navigate to the two dialogs that contain project settings using the following: File | Settings and File | Project Structure.

As Android Studio suggests, press Alt + 1 to open the project view. You can also open it by clicking on the Project button on the left edge of the screen. The Project view shows the list of open projects. These projects are displayed in a hierarchical view. We can change the type of view to Project, Packages, or Android from the upper-left corner of the project explorer, as shown in the following screenshot. The Project view shows the directory structure of the project. The Packages view shows only the package structure.

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