Since you link elements from Layout to Activity in most cases, naming them for reference makes sense. The ID is a field in Attributes used for naming your elements. Your name then appears in the code under R. Many components have text as part of their visual presentation.
For example, TextView displays text as an integral part. You can style it later. The button has text inside, to explain what it does. Let us show you how to set a solid background for a control. You can do this by using a hash colour string in the background field.
If you want to set a solid background using values, you must add a new colour value. Adding a colour as a resource value is useful because you can reuse it everywhere in the app.
Imagine that the first version of your app has all the texts in red, but you later decide to change it to blue. You need to change this value, and the whole app has a blue colour for the texts.
Here is an example of a red colour. Constraints are great for making your layout work on different display sizes. With constraints, you are describing the position of components on the screen. Also, because these are not fixed values, Android can resize and move them around with rules you have set.
Using constraints, you are actually making a ConstraintLayout , that is the best way of making your apps responsive. Naming is important for linking of objects to work. Without names, Android Studio Layout Editor is unable to create constraints. You can check the ability of your design to adapt to screen size even before you run your app. While in the text editor, you can also view the Palette , Component Tree , and design editor by clicking Preview on the right sideof the window.
The Attributes window is not available from the text editor. The buttons in the top row of the design editor allow you to configure the appearance of your layout in the editor.
This toolbar is also available in thetext editor's Preview window. Figure 2. Buttons in the Layout Editor toolbar thatconfigure the layout appearance. Tip: You can resize the device size by dragging thebottom-right corner of the layout.
Note : These configurations have no effect on your app's code ormanifest unless you chose to add a new layout file from Layout Variants ; theyaffect only the layout preview.
Once you have adefault layout, you can create layout variations for specific deviceconfigurations such as for xlarge screens. There are a few different ways to create a new layout, depending on your Project window view, but the following procedure is accessible from any view:. A couple other ways to start a new layout file although the dialogs that appear aredifferent are the following:.
If you already have a layout and want to create an alternative version to optimize the layoutfor different screen sizes or orientations, follow these steps:. When you have multiple variations of the same layout, you can easily switch between them fromthe list that appears when you click Layout Variants.
For more information about how to create layouts for different screens, seeSupporting Different Screen Sizes. You can convert a view to another kind of view, and you can convert a layout view group to another kind of layout. ConstraintLayout is a view group available in the Constraint Layoutlibrary, which is included with Android Studio 2. It was built fromthe ground up along with the Layout Editor, so everything is accessible from thedesign editor and you never need to edit the XML by hand.
Best of all, itsconstraint-based layout system allows you to build most layouts without anynested view groups. For improved layout performance, you should convert older layouts to ConstraintLayout. The command to specifically convert a layout to ConstraintLayout ismore intelligent about inferring constraints and preserving layout than thesimple Convert view command described in the previous section.
Configure your build. Optimize your build speed. Debug your app. Test your app. Profile your app. Android Studio profilers. Profile CPU activity. Benchmark your app. Measure performance. Publish your app. Command line tools. Android Developers. The Layout Editor Palette : Contains various views and view groups that you can drag into your layout. Component Tree : Shows the hierarchy of components in your layout.
Toolbar : Click these buttons to configure your layout appearance in the editor and change layout attributes. Design editor : Edit your layout in Design view, Blueprint view, or both. Attributes : Controls for the selected view's attributes.
View mode : View your layout in either Code , Design , or Split modes. Split mode shows both the Code and Design windows at the same time. Zoom and pan controls : Control the preview size and position within the editor.
Change the preview appearance The buttons in the top row of the design editor enable you to configure the appearance of your layout in the editor. Buttons in the Layout Editor toolbar that configure the layout appearance Corresponding to the numbers in figure 2, the buttons available are as follows: Design and blueprint : Select how you'd like to view your layout in the editor.
Choose Design to see a rendered preview of your layout. Choose Blueprint to see only outlines for each view. You can also press B to cycle through these view types. Screen orientation and layout variants : Choose between landscape and portrait screen orientation, or choose other screen modes for which your app provides alternative layouts, such as night mode.
This menu also contains commands for creating a new layout variant. You can also press O to change orientation. You can resize the device size by dragging the bottom-right corner of the layout. You can also press D to cycle through the device list. API version : Select the version of Android on which to preview your layout.
Show us your layout file. Add a comment. Active Oldest Votes. Chisko Chisko 2, 6 6 gold badges 25 25 silver badges 41 41 bronze badges. No such luck. Try clicking on Add device definition.
You can customize more than just the resolution. Once added, you will see it there. Try it. When I click "Add Device Defintion Nonetheless, your suggestion is ultimately correct, but it required restarting Android Studio for it to work. See my update to the main question above. Follow these steps: 1 Click on "Add Device Definition MilaDroid 1, 2 2 gold badges 20 20 silver badges 35 35 bronze badges.
0コメント