Introduction to Listview in Android

Jul 14, 2015Download as pptx, pdf

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The document discusses ListViews in Android, including introducing AdapterViews and common adapter types like ArrayAdapter. It covers implementing a basic ListView with an ArrayAdapter, using custom adapters, view holders for optimization, adding listeners, headers/footers, and using ListActivity for simplified list handling.

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In this session
• Introduction to ListView
• Introduction to simple List Adapters

Adapter Views
• Android widgets used to display collection of data.
• Adapter Views use adapters for managing data
• Examples of adapter views are
 Spinner,
 ListView,
 Gallery(deprecated in API level 16),
 GridView.

AdapterView Hierarchy
gallery is deprecated since API Level 16

Flow Diagram
Data Source
Database Cursor
ArrayList, Arrays etc.
Adapte
r
ListView

Adapter
• An Adapter object acts as a bridge between an
AdapterView and the underlying data for that view.

Adapters
• BaseAdapter
- provides data model for list
- converts data into fields of the list
- extended by all adapters
• ArrayAdapter
• SimpleCursorAdapter
• Custom Adapter

ArrayAdapter
• handles data based on Arrays or java.util.List

• A view capable of displaying scrollable list of
items
• Creates Views only when needed
• Recycles Views
ListView
ListView example from Laodshedding+ app

Choice Mode
• CHOICE_MODE_NONE
• CHOICE_MODE_SINGLE
• CHOICE_MODE_MULTIPLE

Using ListView
• Declare our ListView in our layout.xml
• Create our Adapter class
• Fetch the items for our list
• Specify the layout that we want for our list items
• Plug our Adapter with our declared Listview

Implementing ListView using
ArrayAdapter
• 1) Add ListView to Activity Layout
•

Implementing ListView…
• prepare adapter
• Set adapter

Using Custom Adapter
• Create a layout of custom View for list item
• Create an instance of an adapter
• Override various methods inside the adapter class
such as , getView(), getCount() etc.
• Set the custom adapter to the listView.

ViewHolder Pattern
• in a long list findViewById() might be called frequently
during the scrolling of ListView, which slows down the
performance
• ViewHolder comes handy in such case.
• A ViewHolder object stores each of the component
views inside the tag field of the Layout, so you can
immediately access them without the need to look them
up repeatedly.

Listeners
• setOnItemClickListener
• setOnItemLongClickListener
• setOnItemSelectedListener
• setOnScrollListener

Headers & Footers
• addHeaderView
- Add a fixed view to appear at the top of the list.
• addFooterView
- Add a fixed view to appear at the bottom of the list.

Adding HeaderView or
FooterView
• Prepare layout for header or footer
• Inflate the layout
• add the view using addHeaderView() method

ListActivity
• If displaying list is primary purpose, ListActivity is
used.
• displays a list of items by binding to a data
source(array, cursor).
• Exposes event handlers when the user selects an
item

ListActivitiy
• Simplifies the handling of ListView
• Set List Adapter in the onCreate() method using
setListAdapter()
• Register click by onListItemClick()

Thank You
And tutorial at
Find source code of ListView Example on
http://blog.technoguff.com/2015/07/introductio
n-to-listview.html
https://github.com/technoguff/L
istViewExample

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Techniques for Automatic Device Identification and Network Assignment.pdfPriyanka Aash

Security Tips for Enterprise Azure SolutionsMichele Leroux Bustamante

Delivering solutions to Azure may involve a variety of architecture patterns involving your applications, APIs data and associated Azure resources that comprise the solution. This session will use reference architectures to illustrate the security considerations to protect your Azure resources and data, how to achieve Zero Trust, and why it matters. Topics covered will include specific security recommendations for types Azure resources and related network security practices. The goal is to give you a breadth of understanding as to typical security requirements to meet compliance and security controls in an enterprise solution.

AI VIDEO MAGAZINE - June 2025 - r/aivideo1pcity Studios, Inc

FIDO Seminar: Authentication for a Billion Consumers - Amazon.pptxFIDO Alliance

PyCon SG 25 - Firecracker Made Easy with Python.pdfMuhammad Yuga Nugraha

Explore the ease of managing Firecracker microVM with the firecracker-python. In this session, I will introduce the basics of Firecracker microVM and demonstrate how this custom SDK facilitates microVM operations easily. We will delve into the design and development process behind the SDK, providing a behind-the-scenes look at its creation and features. While traditional Firecracker SDKs were primarily available in Go, this module brings a simplicity of Python to the table.

FIDO Seminar: New Data: Passkey Adoption in the Workforce.pptxFIDO Alliance

Lessons Learned from Developing Secure AI Workflows.pdfPriyanka Aash

Information Security Response Team Nepal_npCERT_Vice_President_Sudan_Jha.pdfICT Frame Magazine Pvt. Ltd.

Creating Inclusive Digital Learning with AI: A Smarter, Fairer FutureImpelsys Inc.

Have you ever struggled to read a tiny label on a medicine box or tried to navigate a confusing website? Now imagine if every learning experience felt that way—every single day. For millions of people living with disabilities, poorly designed content isn’t just frustrating. It’s a barrier to growth. Inclusive learning is about fixing that. And today, AI is helping us build digital learning that’s smarter, kinder, and accessible to everyone. Accessible learning increases engagement, retention, performance, and inclusivity for everyone. Inclusive design is simply better design.

OpenACC and Open Hackathons Monthly Highlights June 2025OpenACC

The OpenACC organization focuses on enhancing parallel computing skills and advancing interoperability in scientific applications through hackathons and training. The upcoming 2025 Open Accelerated Computing Summit (OACS) aims to explore the convergence of AI and HPC in scientific computing and foster knowledge sharing. This year's OACS welcomes talk submissions from a variety of topics, from Using Standard Language Parallelism to Computer Vision Applications. The document also highlights several open hackathons, a call to apply for NVIDIA Academic Grant Program and resources for optimizing scientific applications using OpenACC directives.

FIDO Seminar: Perspectives on Passkeys & Consumer Adoption.pptxFIDO Alliance

OpenPOWER Foundation & Open-Source Core InnovationsIBM

penPOWER offers a fully open, royalty-free CPU architecture for custom chip design. It enables both lightweight FPGA cores (like Microwatt) and high-performance processors (like POWER10). Developers have full access to source code, specs, and tools for end-to-end chip creation. It supports AI, HPC, cloud, and embedded workloads with proven performance. Backed by a global community, it fosters innovation, education, and collaboration.

AI vs Human Writing: Can You Tell the Difference?Shashi Sathyanarayana, Ph.D

Powering Multi-Page Web Applications Using Flow Apps and FME Data StreamingSafe Software

Unleash the potential of FME Flow to build and deploy advanced multi-page web applications with ease. Discover how Flow Apps and FME’s data streaming capabilities empower you to create interactive web experiences directly within FME Platform. Without the need for dedicated web-hosting infrastructure, FME enhances both data accessibility and user experience. Join us to explore how to unlock the full potential of FME for your web projects and seamlessly integrate data-driven applications into your workflows.

FIDO Seminar: Targeting Trust: The Future of Identity in the Workforce.pptxFIDO Alliance

War_And_Cyber_3_Years_Of_Struggle_And_Lessons_For_Global_Security.pdfbiswajitbanerjee38

Russia is one of the most aggressive nations when it comes to state coordinated cyberattacks — and Ukraine has been at the center of their crosshairs for 3 years. This report, provided the State Service of Special Communications and Information Protection of Ukraine contains an incredible amount of cybersecurity insights, showcasing the coordinated aggressive cyberwarfare campaigns of Russia against Ukraine. It brings to the forefront that understanding your adversary, especially an aggressive nation state, is important for cyber defense. Knowing their motivations, capabilities, and tactics becomes an advantage when allocating resources for maximum impact. Intelligence shows Russia is on a cyber rampage, leveraging FSB, SVR, and GRU resources to professionally target Ukraine’s critical infrastructures, military, and international diplomacy support efforts. The number of total incidents against Ukraine, originating from Russia, has steadily increased from 1350 in 2021 to 4315 in 2024, but the number of actual critical incidents has been managed down from a high of 1048 in 2022 to a mere 59 in 2024 — showcasing how the rapid detection and response to cyberattacks has been impacted by Ukraine’s improved cyber resilience. Even against a much larger adversary, Ukraine is showcasing outstanding cybersecurity, enabled by strong strategies and sound tactics. There are lessons to learn for any enterprise that could potentially be targeted by aggressive nation states. Definitely worth the read!

“Key Requirements to Successfully Implement Generative AI in Edge Devices—Opt...Edge AI and Vision Alliance

For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2025/06/key-requirements-to-successfully-implement-generative-ai-in-edge-devices-optimized-mapping-to-the-enhanced-npx6-neural-processing-unit-ip-a-presentation-from-synopsys/ Gordon Cooper, Principal Product Manager at Synopsys, presents the “Key Requirements to Successfully Implement Generative AI in Edge Devices—Optimized Mapping to the Enhanced NPX6 Neural Processing Unit IP” tutorial at the May 2025 Embedded Vision Summit. In this talk, Cooper discusses emerging trends in generative AI for edge devices and the key role of transformer-based neural networks. He reviews the distinct attributes of transformers, their advantages over conventional convolutional neural networks and how they enable generative AI. Cooper then covers key requirements that must be met for neural processing units (NPU) to support transformers and generative AI in edge device applications. He uses transformer-based generative AI examples to illustrate the efficient mapping of these workloads onto the enhanced Synopsys ARC NPX NPU IP family.

Improving Data Integrity: Synchronization between EAM and ArcGIS Utility Netw...Safe Software

Utilities and water companies play a key role in the creation of clean drinking water. The creation and maintenance of clean drinking water is becoming a critical problem due to pollution and pressure on the environment. A lot of data is necessary to create clean drinking water. For fieldworkers, two types of data are key: Asset data in an asset management system (EAM for example) and Geographic data in a GIS (ArcGIS Utility Network ). Keeping this type of data up to date and in sync is a challenge for many organizations, leading to duplicating data and creating a bulk of extra attributes and data to keep everything in sync. Using FME, it is possible to synchronize Enterprise Asset Management (EAM) data with the ArcGIS Utility Network in real time. Changes (creation, modification, deletion) in ArcGIS Pro are relayed to EAM via FME, and vice versa. This ensures continuous synchronization of both systems without daily bulk updates, minimizes risks, and seamlessly integrates with ArcGIS Utility Network services. This presentation focuses on the use of FME at a Dutch water company, to create a sync between the asset management and GIS.