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The document discusses the key components of a ListView in Android, including the ListView itself, list items, and data for each item. It explains that list items can contain simple or complex layouts. The data comes from adapters that act as intermediaries between the data source and ListView. Adapters fetch data, create layouts for each item, and return items to the ListView. Common data sources are arrays, content providers, and database cursors. The main adapter types are ArrayAdapter for arrays and SimpleCursorAdapter for content providers and cursors.
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Datastructures and algorithms prepared by M.V.Brehmanada Reddy
Chapter 1 Introduction to Data Structures and Algorithms.pdf
Chapter 1 Introduction to Data Structures and Algorithms.pdf
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Grid computing components
There are six major components to grid computing:
1) Security, which includes elements like encryption, authentication, and authorization to securely handle sensitive data across networked computers.
2) User interface to access information on the grid, often through an application interface or portal.
3) Workload management for applications to discover available resources and their status.
4) Scheduler to locate computers to run applications and assign jobs, taking into account queues, load, and resource availability.
5) Data management to securely move data as needed to the right place across machines for applications.
6) Resource management to handle tasks like launching jobs, monitoring status, and retrieving results.
Python files / directories part16
The document discusses reading from and writing to files in Python. It describes the write() and read() methods for writing strings to and reading from open files. It also covers opening files with different modes like "a" for append and "w" for overwrite. Examples are given to illustrate writing a line of text to a file, reading the first 10 bytes of a file, and reading each line of a file using a loop.
Python Classes and Objects part14
The self parameter is used to access variables that belong to a class from within its methods. It refers to the current instance of the class and must be the first parameter of any method in the class. For example, a Person class defines self in the __init__() method to set name and age attributes, and in the myfunc() method to print the name attribute. We can create objects of a class, modify or delete their properties using keywords like del, and delete objects by deleting all references to them using del.
Python Classes and Objects part13
The document discusses classes and objects in Python. A class defines attributes like data members and methods that characterize objects of that class. The class acts as a blueprint to create objects. The __init__() method is a special method that is called when new objects are instantiated and allows assigning values to object properties. It takes self as the first parameter, which refers to the current object instance and is used to access variables belonging to the class.
Python files / directories part15
The document discusses file handling in Python. It explains that the open() function is key for working with files in Python and takes a filename and mode as parameters. It describes different modes for opening files, including 'r' for reading, 'a' for appending, and 'w' for writing. The document also covers getting file attributes after opening and the close() method for closing files.
Python functions part12
This document discusses passing lists and tuples as arguments to functions in Python. It provides examples of passing a list to a function, which allows the function to iterate through the list. It also discusses variable-length arguments using an asterisk, and provides an example of a function that accepts additional unnamed arguments as a tuple. Finally, it discusses anonymous functions in Python using the lambda keyword, and provides an example of defining and calling an anonymous function.
Python functions part11
This document discusses different types of arguments that can be passed to functions in Python, including required arguments, keyword arguments, default arguments, and passing lists as arguments.
Required arguments must be passed to a function in the correct positional order. Keyword arguments allow the caller to identify arguments by parameter name instead of position. Default arguments assume a default value if no value is provided for that argument in the function call. Passing a list as an argument allows a function to accept a variable number of values. Examples are provided to illustrate each type of argument.
Python functions part10
Functions allow you to reuse code by defining blocks of code that can be called. Functions can take parameters and return values. To define a function, use the def keyword followed by the function name and parameters in parentheses. The code block is indented and starts with a colon. To call a function, use the function name followed by parentheses. Arguments can be passed into functions when calling them to provide input.
List view5
The document discusses ArrayAdapter methods for modifying and working with lists in Android. It lists methods for adding and removing items from the list, clearing the list, notifying of data changes, and getting items and positions. It also mentions abilities of ArrayAdapter like filtering and sorting the list. Questions at the end ask to explain the helper methods and provide an example for one method.
Python decision making_loops_control statements part9
The range() function in Python is used to generate sequences of numbers. It returns a sequence of integers from start to stop-1 by default or allowing for specification of the start, stop, and step values. Examples show using range() in for loops to print numbers from 0 to 5 with the default start of 0 and increment of 1, from 2 to 6 with a specified start of 2, and from 2 to 30 incrementing by 3. The document also provides examples of calculating a factorial using for and while loops with range().
List view4
The document discusses Toasts in Android, which are popup messages that provide feedback to users without taking focus away from the current activity. It explains that Toasts are lightweight and non-interactive, and can display text for a predefined short or long duration. An example is provided using the makeText() method, which requires a Context, message string, and duration as parameters. The document also outlines how to specify toast duration and customize toast location on screen.
Python decision making_loops_control statements part8
The document discusses the break, continue, and pass statements in Python. It provides examples of how each statement can be used in for and while loops. The break statement terminates the current loop and continues execution after the loop. The continue statement skips the rest of the current loop iteration and continues to the next one. The pass statement is used when a statement is syntactically required but no operation needs to be performed.
Python decision making_loops part7
This document discusses various types of loops in Python including for loops, while loops, and nested loops. It provides examples of using a for loop to iterate through a list and print each item, as well as using nested while loops to check if a number is prime. The document also briefly mentions loop control statements like break, continue, and pass that can change the normal execution flow of a loop.
Python decision making_loops part6
1. Decision making statements like if-else statements and nested if statements allow programmers to execute different code based on certain conditions being true or false.
2. A nested if statement is when an if statement is placed inside the true block of an outer if statement, allowing for more complex conditional logic.
3. The main difference between if-else and nested if statements is that if-else provides two execution paths based on a single condition, while nested if allows evaluating multiple conditions in sequence to determine the correct execution path.
List view2
This document discusses using built-in layouts and ListView in Android. It provides code to populate a ListView with sample data using an ArrayAdapter. The ListView is defined in an XML layout file and populated in the activity code. Built-in layouts like simple_list_item_1 provide easy-to-use templates for common widgets like TextView and simplify ListView implementation.
Python decision making part5
This document discusses nested if statements in Python. It provides an example of using nested if/elif statements to check multiple conditions for a variable. The syntax shows that an if/elif/else construct can be placed inside another if/elif/else construct. A sample code is given to illustrate this, where an outer if checks if a variable is less than 200, and nested if/elif statements check for specific values of 100, 150, or less than 50.
Python decision making part4
This document discusses decision making structures in Python, including if, if-else, and if-elif-else statements. It provides the syntax and examples of using each type of statement to evaluate conditions and execute code blocks based on whether the conditions evaluate to True or False. The if statement executes code if the expression is true, if-else adds an else block for when the expression is false, and if-elif-else allows checking multiple expressions and executing the block for the first one that is true.
Python operators part3
This document discusses membership and identity operators in Python. Membership operators like 'in' and 'not in' evaluate to True if a variable is or is not found in a specified sequence. Identity operators like 'is' and 'is not' evaluate to True if two variables point to the same object or not. The document also provides examples of using these operators and defines their behavior.
Python operators part2
This document summarizes common operators in programming languages. It describes arithmetic, comparison, assignment, logical, bitwise, and membership operators. For each type of operator, it provides examples of common operators like addition, subtraction, equality, assignment, AND, OR, and examples of their usage. The document is intended as an introduction to different types of operators that can manipulate and compare values in programming.
Python part1
Python was developed by Guido Van Rossum in 1991 and named after Monty Python. It is an interpreted language that is commonly used for web development, software development, mathematics, and system scripting. Some key features of Python include: indentation to indicate code blocks rather than brackets; using # for comments; storing text in string variables and numeric values in number variables; and deleting objects using del statement.
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Python decision making_loops_control statements part9
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Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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List view1
- 1. Prof. Neeraj Bhargava Vishal Dutt Department of Computer Science, School of Engineering & System Sciences MDS University, Ajmer
- 2. What is a list view? A ViewGroup that displays scrollable items.
- 3. 3 Parts of a ListView The ListView itself aka a ViewGroup List items Each row/item in the list. Each item is a layout consisting of a View or ViewGroup. Data for each item
- 4. ListItem Since the ListItem can be a ViewGroup, we have the power to display very simple or extremely complex layouts for each item. A TextView A TextView and ImageView A TextView and CheckBox A TextView and Button A TextView, ImageView, CheckBox, Button, and RatingBar, etc
- 5. Where does the data come from? ListViews receive data via Adapters. The Adapter behaves as the middleman between the data source and the ListView.
- 6. The job of an Adapter The Adapter fetches data from the source. Creates the layout that represents each list item. Takes the data fetched from the source places it into the list item layout. Returns a list item to the ListView.
- 7. How an Adapter Works Array<String> mMovies = { "Bill and Ted's Excellent Adventures", "Teen Wolf", "Honey I shrunk the kids", "Texas Chainsaw Massacre", "Puppet Master" } Adapter Bill and Ted’s Excellent… Teen Wolf Honey I shrunk… Texas Chainsaw Mas… Pupper Master Bill and Ted… ListView
- 8. Data source for Adapters 1. Arrays 2. Content Provider Used to get Calendar and Contact info from phone. 3. Database Cursor
- 9. Types of Adapters ArrayAdapter Works with Arrays Can handle any Java Object as input Uses the .toString() method of the JavaObject to obtain text for list item. SimpleCursorAdapter Works with a Content Provider and Database Cursor