Views From The 6 Android

Views From The 6 Android
Android Online Course for Professionals
Share this blog to spread the knowledge
The Android application having an excellent UI will have a large number of users because usually, people get attracted towards the look and feel of the application. So, to make the UI of the application good, we need to learn about XML(Extensible Markup Language) and View components in Android. So, in this blog, we will learn about User Interface(UI) in Android. Here, we are going to start with XML (extensible markup language) and design a screen and understand what the different types of View Components Android Studio provided to us. So, let's start with View.
The view is the component which Android provides us to design the layouts of the app. So, we can understand view as a rectangular area which is going to contain some element inside it.
A View is a superclass for all the UI components. You can also check out the official documentation of View, here .
What are these UI components that we can use in our application? Let's make a small list of some of the view components:
These are some of the UI components that are available for our use.
A group of view is known as ViewGroup . The Top-level ViewGroup is a parent, and under it, all the view and other view groups are its children. For example , under a LinearLayout, you can add two Buttons and one EditText. Here, LinearLayout is the parent view and the Buttons and EditTexts are the children.
You can edit the layout file that is available to you like activity_main.xml or you can create one layout file by going app > res > layout > right-click > New > Layout resource file and then enter the file name and click on OK .
You can find your existing XML files in app > res > layout > your_xml_files .
You can see a palette of components which divided into different sections like widget, text, layouts etc. Either you can add the elements by dragging and dropping the elements or you can write the code for those elements. There are two options that are available when you open an XML file i.e. Design and Text . In the Design part, you can drag and drop the elements you want to use, while in the Text part, you can write the code for those elements.
Here is an example of drag and drop:
You can customise elements property like colour, size, text etc.
Let's discuss some of the view customisations:
Resources is something that you will use in your application. For example , it can be the images or the layout files or some string values or something else. Following are the folders that are present inside the res folder:
To arrange the code in a better way, Android Studio provides us with this feasibility where we can define all our colours, strings, sizes and styles at one place and use them wherever we need it. For example :
Every measurement has a particular unit like Km for distance, L for liquids, etc. Similarly, Android also has its own measurement system.
Now, suppose you are using some 20px * 20px image in your application. That image might look good in small mobile devices but for large-screen mobile devices that image might not look good due to low resolution. So, you have to use different resolutions of images for different mobile screen. So to store these images separately, Android Studio has separate folders. All you need to do is put the images in these folders with the same name and Android will do the rest for you. The following folders are present in Android Studio:
We only need to put things in those folders and Android System automatically take stuff from here based on the resolution of the mobile screen on which the application is running.
You can find these folders under the res folder(open the project in Project or Package or Project Files view).
Here, in this example, we will create a one activity application and we will add one Button with some text on it. When you click on the button, then the text and the colour of the button will be changed. For better understanding, we will store all the texts in strings.xml file and all the colours in colors.xml file.
Create a project in Android Studio. After creating the project, go to res > values > strings.xml and add the below lines:
Now go to res > values > colors.xml and add the below two colours:
Now, in the activity_main.xml file, add the below code:
Now, we are done with the layout file. Here, you can notice how we have used the text and colours that are stored in their respective files.
Now, open the MainActivity.kt file and add the below code:
Now, run the application in our mobile device or on the Android Emulator and you will see something like below:
Try to experiment with this application by using various other views in your application like TextView, EditText, etc. These views will only be clear to you if you use them in your application.
That's it for this blog. Hope you learned something new today.

Was this page helpful?
Yes
No

Performance & security by Cloudflare

You cannot access medium.com. Refresh the page or contact the site owner to request access.
Copy and paste the Ray ID when you contact the site owner.

Ray ID:

74386ce96a4c9d4c

74386ce96a4c9d4c Copy

For help visit Troubleshooting guide

Sign up or log in to customize your list.

more stack exchange communities

company blog

Stack Overflow for Teams
– Start collaborating and sharing organizational knowledge.

Create a free Team
Why Teams?

Asked
9 years, 10 months ago

Modified
5 years, 1 month ago

5,661 12 12 gold badges 52 52 silver badges 111 111 bronze badges

Highest score (default)

Trending (recent votes count more)

Date modified (newest first)

Date created (oldest first)

794 5 5 silver badges 8 8 bronze badges

5,954 6 6 gold badges 30 30 silver badges 68 68 bronze badges

2,312 18 18 silver badges 22 22 bronze badges

11.7k 6 6 gold badges 49 49 silver badges 63 63 bronze badges

1,196 1 1 gold badge 9 9 silver badges 19 19 bronze badges

7,940 8 8 gold badges 31 31 silver badges 58 58 bronze badges

Stack Overflow

Questions
Help

Products

Teams
Advertising
Collectives
Talent

Company

About
Press
Work Here
Legal
Privacy Policy
Terms of Service
Contact Us
Cookie Settings
Cookie Policy

Stack Exchange Network

Technology

Culture & recreation

Life & arts

Science

Professional

Business

API

Data

Accept all cookies

Customize settings

Find centralized, trusted content and collaborate around the technologies you use most.
Connect and share knowledge within a single location that is structured and easy to search.
I want to get the view or findViewById() from Context?
Or from intent?
I'm trying to reach a specific view in my broadcast receiver and the parameter of onReceive are context and intent.
Well, I have a class and within it is my broadcast receiver. Now, I'm trying to separate the broadcast receiver from it, but I need a way so I can still communicate with the views on my class from my separated broadcast receiver class.
Trending sort is based off of the default sorting method — by highest score — but it boosts votes that have happened recently, helping to surface more up-to-date answers.
It falls back to sorting by highest score if no posts are trending.
For example you can find any textView:
Starting with a context, the root view of the associated activity can be had by
In Raw Android it'd look something like:
Then simply call the findViewById on this
In your broadcast receiver you could access a view via inflation a root layout from XML resource and then find all your views from this root layout with findViewByid():
Now you can access your views via 'view' and cast them to your view type:
then you can use this to find any element in layout.
Why don't you just use a singleton?
Thanks for contributing an answer to Stack Overflow!

By clicking “Post Your Answer”, you agree to our terms of service , privacy policy and cookie policy

To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

Site design / logo © 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA . rev 2022.8.31.42951

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy .

Wajahat Karim

🔥 Google Dev Expert (GDE) in Android . 📱 Android Dev. 💻 Open Source Contributor . 📝 Technical Writer . 🎤 Public Speaker

🌍 Making the world a better place, one app at a time.
🔥 Google Developer Expert (GDE) in Android .
📱 Professional Android Developer with ~10 years experience.
💻 Creator of various Open Source libraries on Android .
📝 Author of two technical books and 100+ articles on Android.
🎤 A passionate Public Speaker giving talks all over the world.

NEXT

PREVIOUS

2 Comments

NEXT

PREVIOUS

2 Comments

Share on Facebook

Share on Twitter

Share on Google+

This article will guide you on how to secure your API keys, Base URLs, and other sensitive data of your app.
Security is a very important topic and has to be taken seriously when developing Android applications, especially if sensitive data is stored on the device.
In this article, you will learn about the basic concepts of Design Patterns, their advantages, and types. You will also see an example of the Singleton Design pattern in Kotlin for Android.
To store some little amount of data in Android like phone number, name, or a person, etc. Android developers use SharedPreferences API.
When app developers publish apps on stores like Google Play or App Store etc., their apps are given reviews by users.
Instead of making a number of RecyclerViews for each adapter in our app, a class named as ConcatAdapter is introduced in recyclerview:1.
Google have introduced native support of system-wide dark themes in Android 10. And with it rolling out in more and more devices every month, the need for Dark mode for your app is on-rise and demand.
In this article, we are going to make an app that will show you the list of all the universities in a country we want to know about.
With over 2 billion Android devices running in the world with different sizes and targets like mobiles, tablets, TVs, cars, embedded hardware and so on, Android UIs have become a very impactful part of both Android users and developers.
Android Studio Bumblebee Launcher The latest stable release of Android Studio, interestingly named after an insect “Bumblebee” is 2021.1.1 with Android Gradle plugin (AGP) version 7.
For more than a decade, Android developers have struggled with a simple but annoying issue. Getting the view reference from XML layouts to their view classes such as Activity or Fragments in entirely separate language — Java or Kotlin.
As a beginner in Android, I used to get confused a lot. The Android SDK provided a method: findViewById() . Functionality-wise, this method performs a singular task — it will give you the reference to the view in XML layouts by searching its ID. And if nothing is found, it will give you the good old NULL , which is said to be the 1-billion dollar mistake by its creator .
In this article, I am going to discuss on how the findViewById() evolved over time and what’s the best approach in “modern Android development” to get the view reference from XML layouts.
Obviously, the first one is the findViewById() method. Introduced in the API level 1, this requires an ID and returns a View object.
There are some problems with this approach.
If there is view with this ID in this layout, you won’t get any compile time errors. Rather you will get NullPointerException at runtime when Android fails to locate the view in Activity , Fragment or ViewGroup .
If the view is TextView in XML layout and you are type-casting it as Button , you won’t get any compile time errors. Instead you will get ClassCastException as a TextView cannot be converted to Button .
This method was used extensively and is being used as well throughout whole evolution of Android SDK. In the API level 26 of compileSdk , the definition of this method was slightly changed to remove the casting issue.
Now, developers don’t need to cast their views manually in the code. If you are referencing a Button with a TextView ID, then Android SDK will try to find the Button with the provided ID and it will return NULL because it won’t be able to find it.
But in Kotlin, you would still need to provide the type like findViewById(R.id.txtUsername) . This may give you NullPointerException if you are not checking your views for null-safety, but this method will not throw ClassCastException like it used to.
Type-safe: Before API 26, there was no type-safety.
Null-safe: No null-safety. You will have to check views before accessing for null values.
Boilerplate Code: A lot. You have to declare a separate variable for all the views you need from XML layouts.
Build-time: No difference in build time.
Languages: Supports both Java and Kotlin.
Many different libraries have tried to simplify the findViewById() usage with different methods. Particularly, the Butterknife library created by Jake Wharton has become super famous and has got huge interest by developers around the world. It has become to sort-of standard way to avoid the findViewById usage.
The library uses annotation-processing and fetches the views from XML layouts using the findViewById method under the hood through code generation. It’s very easy to use, and helps in reducing the boilerplate code for developers.
It has almost similar issues as findViewById . However, it adds a null-safety check at runtime to avoid the NullPointerException .
Attention : This tool is now deprecated. Please switch to view binding . Existing versions will continue to work, obviously, but only critical bug fixes for integration with AGP will be considered. Feature development and general bug fixes have stopped. —** Source: Butterknife Github repository **
Type-safe: No type-safety as it uses findViewById .
Null-safe: The library checks the views for null-ability at runtime before accessing.
Boilerplate Code: Reduces the boilerplate as annotation processors a
Gina.Valentina
Big Titty Cum
Arab Porn Website

Views From The 6 Android

Report Page