24 little Programs from "Hello World" to "Create an application to open any URL inside the application and clicking on any link from that URL should not open Native browser but that URL should open the same screen" with program code.
Table of Contents
Program-1
Program-2
Program-3
Program-4
Program-5
Program-6
Program-7
Program-8
Program-9
Program-10
Program-11
Program-12
Program-13
Program-14
Program-15
Program-16
Program-17
Program-18
Program-19
Program-20
Program-21
Program-22
Program-23
Program-24
Objectives and Topics
This technical guide serves as a comprehensive collection of practical Android development exercises, aimed at providing developers with hands-on experience in building various application components, from basic UI elements to advanced service management and database operations.
- Fundamentals of Android UI design and layout management.
- Implementation of user interaction via Intents, Activity lifecycles, and event listeners.
- Integration of system services including media playback, SMS messaging, and browser navigation.
- Advanced data persistence using SQLite databases and external storage file handling.
Excerpt from the Book
Program-2
To understand Activity, Intent a. Create sample application with login module.(Check username and password) b. On successful login, go to next screen. And on failing login, alert user using Toast. c. Also pass username to next screen.
package com.Prog_2; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast;
public class Prog_2Activity extends Activity implements OnClickListener{ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);
Button b= (Button) findViewById(R.id.btnLogin); b.setOnClickListener(this); } public void onClick(View v) { Intent i = new Intent(this, Activity2.class);
Summary of Chapters
Program-1: Introduces basic UI layout by displaying a "Hello World" text message with specific styling on the screen.
Program-2: Demonstrates the creation of a login module that validates credentials and navigates to a new screen upon success.
Program-3: Focuses on input validation, specifically disabling the login button until the username and password meet certain criteria.
Program-4: Extends the login application by triggering an external browser navigation to a specific URL upon successful login.
Program-5: Covers data handling by passing numbers between activities and displaying a dynamic list of items based on the input.
Program-6: Explores resource management by using a Spinner component to update an image based on the selected value.
Program-7: Illustrates the use of the Android Menu system to change screen background colors based on user selection.
Program-8: Implements scheduled tasks to display Toast messages at specific time intervals.
Program-9: Provides an introduction to Android Services for background processing.
Program-10: Demonstrates animation utilities, allowing users to trigger various image animations via a spinner selection.
Program-11: Focuses on UI structure for listing complex data and detailing information for selected items.
Program-12: Covers content providers and permissions by accessing and displaying system phonebook contacts.
Program-13: Explains how to read and display mobile device messages on the screen using content resolvers.
Program-14: Implements call functionality, allowing the application to dial a phone number entered by the user.
Program-15: Introduces SQLite database management, including table creation and record retrieval.
Program-16: Covers file operations, specifically reading data from the assets folder and copying it to the external storage (SD card).
Program-17: Demonstrates media playback functionality by playing an MP3 file located on the device's memory card.
Program-18: Provides a comprehensive CRUD (Create, Read, Update, Delete) example using an SQLite database for student records.
Program-19: Explains how to perform read and write operations on files stored on the SD card.
Program-20: Shows how to implement touch events to allow a user to draw lines on the screen by dragging their finger.
Program-21: Demonstrates how to send SMS messages between two emulators using the telephony manager.
Program-22: Shows how to integrate and use the device's native camera application to capture photos.
Program-23: Illustrates how to pick and display an image from the native application gallery.
Program-24: Demonstrates web integration by loading a URL inside the application using a WebView.
Keywords
Android, Activity, Intent, SQLite, Service, UI, Layout, Toast, WebView, SMS, Camera, File IO, Animation, Event Listener, Mobile Development
Frequently Asked Questions
What is the primary focus of this collection of programs?
The work provides a practical foundation for Android development, covering essential topics from basic UI design to more complex system integrations.
What are the main thematic fields addressed?
The themes include Activity lifecycles, User Interface (UI) components, data persistence (SQLite), and utilizing hardware features like the camera, SD card, and telephony.
What is the primary objective of these tutorials?
The objective is to equip developers with the technical knowledge to implement common Android functionalities, such as login authentication, background services, and external hardware access.
Which scientific or technical methods are utilized?
The guide uses a code-centric, demonstrative methodology, providing complete Java code snippets and XML layout configurations for each practical exercise.
What does the main body of the work cover?
The main body consists of twenty-four distinct programming exercises, each detailing specific Android components or API integrations.
Which keywords best characterize these applications?
Key terms include Android Activity, Intent, SQLite, File I/O, and UI Event Handling.
How does the book approach database management in Android?
It demonstrates practical implementation through SQLite, showing users how to create databases, define tables, and perform standard CRUD operations.
Is there guidance on handling external hardware like SD cards?
Yes, several programs, specifically Program 16 and 19, provide step-by-step instructions and code for reading from and writing to SD card storage.
How is the messaging functionality between emulators implemented?
Program 21 provides a detailed guide on using the SmsManager and BroadcastReceivers to send and receive text-based messages.
What is the purpose of the WebView example in the final program?
The final program demonstrates how to display web content directly within an application, ensuring that navigation remains contained within the app environment rather than opening an external browser.
- Citar trabajo
- Nitin Chikani (Autor), 2013, Android Programming For Beginners, Múnich, GRIN Verlag, https://www.grin.com/document/265335
