Add view display into top of screen andoid năm 2024
The Layout Editor enables you to quickly build Show
The Layout Editor is especially powerful when building a layout with This page provides an overview of the Layout Editor. To learn more about layout fundamentals, see Layouts. Introduction to the Layout EditorThe Layout Editor appears when you open an XML layout file. Figure 1. The Layout Editor.
When you open an XML layout file, the design editor opens by default, as shown in figure 1. To edit the layout XML in the text editor, click the Code button in the top-right corner of the window. Note that the Palette, Component Tree, and Attributes panels are not available while editing your layout in Code view.Tip: To switch between design and text editors, press`Alt` ( Change the preview appearanceThe buttons in the top row of the design editor let you configure the appearance of your layout in the editor. ![Buttons in the Layout Editor toolbar that configure the layout
Create a new layoutWhen adding a new layout for your app, first create a default layout file in your project's default You can create a new layout in one of the following ways:
Use the Project view
Use the Android view
Use the Resource Manager
Use layout variants to optimize for different screensA layout variant is an alternative version of an existing layout that is optimized for a certain screen size or orientation. Use a suggested layout variantAndroid Studio includes common layout variants that you can use in your project. To use a suggested layout variant, do the following:
A new layout directory is created. Create your own layout variantIf you'd like to create your own layout variant, do the following:
When you have multiple variations of the same layout, you can switch between them by selecting a variant from the Action to switch and create qualifiers for layout files drop-down. For more information about how to create layouts for different screens, see Support different screen sizes. Convert a view or layoutYou can convert a view to another kind of view, and you can convert a layout to another kind of layout:
Convert a layout to ConstraintLayoutFor improved layout performance, convert older layouts to`ConstraintLayout`. To convert an existing layout to a
To learn more about Find items in the PaletteTo search for a view or view group by name in the Palette, click the Search button at the top of the palette. Alternatively, you can type the name of the item whenever the Palette window has focus.In the Palette, you can find frequently used items in the Common category. To add an item to this category, right-click a view or view group in the Palette and then click Favorite in the context menu. Open documentation from the PaletteTo open the Android Developers reference documentation for a view or view group, select the UI element in the Palette and press To view Material Guidelines documentation for a view or view group, right-click the UI element in the Palette and select Material Guidelines from the context menu. If no specific entry exists for the item, then the command opens the homepage of the Material Guidelines documentation. Add views to your layoutTo start building your layout, drag views and view groups from the Palette into the design editor. As you place a view in the layout, the editor displays information about the view's relationship with the rest of the layout. If you are using Edit view attributesFigure 5. The Attributes panel.You can edit view attributes from the Attributes panel in the Layout Editor. This window is available only when the design editor is open, so view your layout in either Design or Split mode to use it. When you select a view, whether by clicking the view in the Component Tree or in the design editor, the Attributes panel shows the following, as indicated in figure 5:
Add sample data to your viewBecause many Android layouts rely on runtime data, it can be difficult to visualize the look and feel of a layout while designing your app. You can add sample preview data to a `Alt`1, an`Alt`2, or a `Alt`3 from within the Layout Editor. To display the Design-time View Attributes window, right-click one of these view types and choose Set Sample Data, as shown in figure 6. Figure 6. The Design-time View Attributes window.For a `Alt`1, you can choose between different sample text categories. When using sample text, Android Studio populates the `Alt`5 attribute of the`Alt`1 with your chosen sample data. Note that you can choose sample text via the Design-time View Attributes window only if the `Alt`5 attribute is empty. Figure 7. A `Alt`1 with sample data.For an `Alt`2, you can choose between different sample images. When you choose a sample image, Android Studio populates the `Control`0 attribute of the`Alt`2 (or `Control`2 if using AndroidX). Figure 8. An `Alt`2 with sample data.For a `Alt`3, you can choose from a set of templates that contain sample images and texts. When using these templates, Android Studio adds a file to your `Control`5 directory, `Control`6, that contains the layout for the sample data. Android Studio also adds metadata to the`Alt`3 to properly display the sample data. Figure 9. A `Alt`3 with sample data.Show layout warnings and errorsThe Layout Editor notifies you of any layout issues next to the corresponding view in the Component Tree by using a red circle exclamation icon for errors or an orange triangle exclamation iconfor warnings. Click the icon to see more details.To see all known issues in a window below the editor, click Show Warnings and Errors ( or) in the toolbar.Download fonts and apply them to textWhen using Android 8.0 (API level 26) or the Jetpack Core library, you can select from hundreds of fonts by following these steps: |