Curso Android. Otros Layouts Haciendo Scroll. Vídeo 22

pildorasinformaticas

25 May 201612:32

Summary

TLDRThis video script is a tutorial on creating Android applications, focusing on implementing vertical and horizontal scrolling layouts. The instructor guides viewers on using ScrollView and HorizontalScrollView in Android Studio, demonstrating how to add multiple buttons and other UI elements that exceed the screen's visible area. The tutorial covers the process of setting up these containers within a relative layout, ensuring a seamless user experience with scrollable content.

Takeaways

📚 The video is a tutorial on Android application development, focusing on different layouts for user interfaces.
🔍 It introduces two types of scrollable layouts found within the 'containers' section of Android Studio: ScrollView for vertical scrolling and HorizontalScrollView for horizontal scrolling.
📉 The purpose of scrolling is to manage interfaces with many elements that do not fit horizontally or vertically on the screen, allowing users to scroll through them.
👆 Demonstrates how to implement vertical scrolling by adding buttons to a Relative Layout and then wrapping them with a ScrollView.
👎 Points out that ScrollView only accepts one child layout, which should be set up to hold multiple UI elements for scrolling purposes.
📐 Explains the process of adding a LinearLayout (vertical) inside the ScrollView to organize multiple buttons or other UI elements in a vertical list.
🤔 Highlights the importance of correctly placing the LinearLayout inside the ScrollView to enable the scrolling feature.
📱 Discusses the limitations of the emulator's view compared to a real device, where physical gestures like swiping would be used for scrolling.
🔄 Provides a step-by-step guide to creating a horizontal scroll by using HorizontalScrollView and placing a LinearLayout (horizontal) inside it.
🛠️ Mentions the use of Android Studio's design components and layout hierarchy to build the scrolling interfaces.
⚠️ Notes the appearance of warnings in Android Studio, but reassures viewers that these are not errors and can be safely ignored in this context.
🔚 Concludes by encouraging viewers to stay tuned for the next part of the series and wishes them well.

Q & A

What is the main topic of the video script?
-The main topic of the video script is teaching how to implement scrolling layouts in Android applications using ScrollView and HorizontalScrollView.
What are the two types of scroll views discussed in the script?
-The two types of scroll views discussed are ScrollView for vertical scrolling and HorizontalScrollView for horizontal scrolling.
Why might one need to implement scrolling in an Android interface?
-One might need to implement scrolling in an Android interface when there are too many views, buttons, texts, menus, or images that do not fit horizontally or vertically on the screen.
What is the default layout in Android Studio when creating a new application?
-The default layout in Android Studio when creating a new application is a RelativeLayout.
How does the script suggest to start working with ScrollView?
-The script suggests starting to work with ScrollView by replacing the current layout with a RelativeLayout, if not already in use, and then adding ScrollView from the 'Containers' section in Android Studio.
What is a limitation of ScrollView when adding components?
-ScrollView only allows one direct child component, which means you cannot add multiple components directly inside ScrollView without nesting them within another layout.
What type of layout should be added inside ScrollView to hold multiple components?
-A LinearLayout, either vertical or horizontal depending on the desired scroll direction, should be added inside ScrollView to hold multiple components.
How does the script demonstrate adding components to a vertical scroll layout?
-The script demonstrates adding components by inserting a LinearLayout inside ScrollView and then adding multiple buttons to the LinearLayout.
What does the script suggest to do when the visible area of the layout is filled with components?
-The script suggests continuing to add components beyond the visible area, which will then allow the user to scroll to see the additional components.
How can you tell if a component is correctly nested inside ScrollView?
-You can tell if a component is correctly nested inside ScrollView by checking the component hierarchy in the 'Component 3' panel, where the component should be indented and show as a child of ScrollView.
What does the script mention about the yellow triangles (warnings) in Android Studio?
-The script mentions that the yellow triangles (warnings) in Android Studio are not errors and do not prevent the application from running, but they are worth reading occasionally for additional information.

Outlines

00:00

📚 Introduction to Android Layouts and ScrollView

This paragraph introduces the topic of the video, which is about exploring different layouts in Android application development, specifically focusing on ScrollView and HorizontalScrollView. The instructor explains that these are not typical layouts but container views found in Android Studio, used for vertical and horizontal scrolling respectively. The purpose of scrolling is to accommodate more UI elements when they do not fit horizontally or vertically on the screen. The instructor begins by setting up a project, removing the existing button, and switching from a LinearLayout to a RelativeLayout to start fresh. The paragraph also touches on the issue of not being able to see all elements when too many are added to the layout.

05:01

🔄 Implementing Vertical Scrolling with ScrollView

The second paragraph delves into the process of implementing vertical scrolling in an Android application. The instructor guides through the steps of adding a ScrollView container from the 'containers' section in Android Studio. It is emphasized that ScrollView only allows one child component, and the correct way to use it is by nesting a LinearLayout (or another suitable layout) within the ScrollView. The instructor demonstrates adding multiple buttons to the LinearLayout inside the ScrollView, explaining how this setup allows for vertical scrolling when the content exceeds the visible area of the screen. The paragraph concludes with a demonstration of the scrolling functionality in the emulator.

10:02

🔄 Implementing Horizontal Scrolling with HorizontalScrollView

The final paragraph of the script discusses implementing horizontal scrolling using HorizontalScrollView. Similar to the ScrollView, the instructor explains that HorizontalScrollView is added to the RelativeLayout and requires a suitable layout, such as a Horizontal LinearLayout, to be nested within it. The process involves adding multiple buttons to the Horizontal LinearLayout to demonstrate how content can be scrolled horizontally when it extends beyond the visible screen width. The instructor also addresses common warnings that appear in Android Studio during this process, reassuring viewers that these are not errors but notifications that can be safely ignored. The paragraph ends with a live demonstration of horizontal scrolling in the emulator and an invitation to stay tuned for the next part of the course.

Mindmap

Keywords

💡Android Studio

Android Studio is the official integrated development environment (IDE) for Android app development, based on IntelliJ IDEA. It is the primary tool used throughout the video for designing and coding Android applications. The script mentions it as the environment where layouts and other UI elements are added and manipulated.

💡Layouts

In Android development, layouts are XML files that define the structure and arrangement of UI elements in an app. The video discusses different types of layouts, emphasizing their importance in organizing app interfaces, with a focus on ScrollView and HorizontalScrollView.

💡ScrollView

ScrollView is a layout in Android that allows for vertical scrolling of its child views. The video explains how ScrollView can be used to accommodate more UI elements vertically than can be displayed on the screen at once, enhancing the user interface by making additional content accessible.

💡Horizontal Scroll View

Horizontal Scroll View, as mentioned in the script, is a layout that enables horizontal scrolling of its child elements. It is used when there are too many UI components that cannot fit horizontally on the screen, allowing users to scroll left and right to view all elements.

💡Scrolling

Scrolling refers to the action of moving the viewable area of content up, down, left, or right to access parts of the content that are outside the initial view. The video demonstrates how to implement both vertical and horizontal scrolling to improve app navigation and content accessibility.

💡Relative Layout

Relative Layout is a layout in Android that allows positioning of child elements relative to each other or the parent layout itself. In the video, it is initially used as the base layout before introducing ScrollView and HorizontalScrollView to manage overflow content.

💡Linear Layout

Linear Layout is a layout in Android that arranges child elements in a single column or row. The script discusses replacing the default Relative Layout with a Linear Layout and later using it within a ScrollView to organize buttons vertically.

💡UI Elements

UI Elements are the visual components of a graphical user interface, such as buttons, text fields, and images. The video script frequently mentions buttons as examples of UI elements that can be added to layouts to create a functional and interactive app interface.

💡Component Panel

The Component Panel in Android Studio is a tool that allows developers to drag and drop UI elements into their layouts. The script describes using this panel to add buttons and other elements to the Relative Layout and ScrollView for constructing the app's interface.

💡Emulator

An Emulator is a software that mimics the hardware of a device, allowing developers to test their apps on different Android devices without needing the physical hardware. The video script describes using an emulator to see the scrolling functionality in action after setting up the layouts.

💡Visual Interface

The visual interface, or UI, is what users interact with when using an app. The video focuses on creating a functional and visually organized interface by using ScrollView and HorizontalScrollView to manage overflow content and enhance the user experience.

Highlights

Introduction to Android application development course focusing on different layouts.

Exploring ScrollView and HorizontalScrollView for vertical and horizontal scrolling respectively.

Explanation of when to use scrolling features in Android interfaces with too many elements.

Demonstration of adding buttons to a project using Android Studio's layout editor.

Switching from LinearLayout to RelativeLayout for better organization.

Adding multiple buttons to test the limits of the visible layout area.

Observation of elements exceeding the visible area and the need for scrolling.

Instructions on how to implement ScrollView for vertical scrolling.

Limitation of ScrollView to only one child component and how to work around it.

Inserting a LinearLayout inside ScrollView to add multiple vertical buttons.

Visual representation of ScrollView in action with multiple buttons.

Addressing Android Studio's yellow warning triangles and their meaning.

Transition to implementing HorizontalScrollView for horizontal scrolling.

Steps to add HorizontalScrollView and a LinearLayout for horizontal elements.

Example of adding buttons to HorizontalScrollView and observing the scrolling effect.

Final demonstration of horizontal scrolling in the Android emulator.

Invitation to stay tuned for the next part of the Android development course.