android draw line over textview

Thankfully, the Android framework provides us with a class that handles all of the complexity for us: Layout (in the android.text package), described as “a base class that manages text layout in visual elements on the screen”. ... paint — the paint which we’re using to draw the line. Selected Reading Using Line shape we can create Underline below TextView Just like this. Thankfully, we have several nice options: 12. drawText. Following is the example of using multiple EditText controls with different input types like password, phone, etc. color , textSize , etc. (Large preview). How to dynamically generate line on canvas at application run time on activity screen on button click. Questions: I’m new to android programming and what I’m trying to figure out is this; In my layout i have a TextView, ImageView, and Button, all on a vertically oriented LinearLayout. I hope this post has provided some insight into StaticLayout and how it can be used for multiline text drawing on Canvas. 2- Open up activity_main.xml file, here we will add a TextView and 2 Buttons. draw (canvas) Note: If you would like to dynamically draw onto Canvas like in 2D Games, you may create a thread that redraws onto canvas at a frequency set by FPS parameter and create the illusion of object movement. We will build a demo app that will have a TextView with text and 2 Buttons. Considering that we are trying to draw some static (multiline) text to Canvas, StaticLayout is just what we need! Text Drawing. Given that the parameters of the drawMultilineText function essentially describe the uniqueness of a StaticLayout for our purposes, we can create our own key like so: The final implementation provides us with an idiomatic (and, hopefully, performant) way of drawing multiline text to Canvas, which feels at home amongst other Canvas functions. We now know the basics of what StaticLayout is and how we can use it to draw multiline text to Canvas. It makes use of the handy Canvas.withTranslation function found in the Android KTX library: There may be multiple places in an app in which we need to implement multiline text drawing. Here, a horizontal line was drawn by making a rectangle of very small height and the desired width such that it becomes a horizontal line. i did exactly as you have done. Separator line is used to separate two views inside android activity with the use of divider line it will make views individually so app user can easily understand both views. color, textSize, etc.). 8- Now we are done with adding those views inside activity_main.xml file, next let’s open MainActivity.java file and initialize our views. Before we progress, there’s one thing that needs to be discussed… What is TextPaint? This violates our goal to avoid object allocation during drawing. In short, you use it exactly as you would Paint and don’t have to worry about the extra data it includes (for the purpose of what we are doing). In Android SDK we can use a lot of useful predefined and ready-to-go views like TextView, Button, CheckBox, ProgressBar and many others. After over an hour of reading Android-related blogs and forums posts, I came across this little gem on the official Android issue tracker: Issue 29944: DashPathEffect/drawLine not … If you have any questions, thoughts or suggestions then I’d love to hear from you! In order to draw the line, we use canvas.drawRect(…). How do I load an ImageView by URL on Android? How do I programmatically “restart” an Android app? To add to this, the constructors have been deprecated in API Level 28. In this blog you will know how to increase the spacing between two lines of TextView. On Android, we normally use TextView … 1- Open up Android Studio and create a new project and give it a name, in our case we’ve named it (StrikethroughText), choose API 16 as the minimum SDK, then choose a blank activity, click “Finish” and wait for Android Studio to build your project. We can now draw multiline text to Canvas in a way that feels very familiar to the existing text drawing functions: Our new drawMultilineText extension function is great to use, but it’s doing something it shouldn’t: it instantiates a new StaticLayout every time it is called. Unfortunately you can’t just include \n characters in your text, as all whitespace characters are interpreted and drawn as spaces within the single line. Here you specify the shape you want to draw as Rectangle, then you specify the thickness of Android border and color by using Stroke. From here on, we’ll refer to this as multiline text. Firstly, instantiate one by obtaining and using a StaticLayout.Builder: A few parameters are required when obtaining the builder: These parameters allow StaticLayout to layout the text appropriately within the bounding width. Paint includes handy measureText and breakText functions for splitting up text which you could use. Save my name, email, and website in this browser for the next time I comment. Android Ratingbar Example – Adding Rating Stars in Your App, Android Profile Page Design in XML Tutorial, Android Firebase UI – How to Use Firebase Phone Auth, Android Developer Options – Must Know Options For Devs, Android Loading View – Add Spinner And Dot Loading Animation, Android Toast Message – Custom Toast With Icon And Color. Using StaticLayout is quite simple. Preview of Android Textview border. Questions: I would like to draw a line right in the middle of a layout and use it as a separator of other items like TextView. From the documentation, it is described as “an extension of Paint that leaves room for some extra data used during text measuring and drawing”. We can use these properties along with a basic Canvas translation to position the text. This example demonstrates how do I draw text on imagein android. How to add border on Android TextView. In this tutorial we are creating an straight line just above the canvas using canvas.drawLine() method. Create Drawing Objects. We will give it a label, position it in the center of the screen and add some margin-top, so that there is a space between the TextView and the Button. Step 2 − Add the following code to res/layout/activity_main.xml. You can also check Kotlin Tutorial for beginners.Also, if you are interested in content writing, you can mail us at tutorialwing@gmail.com. The source code for this tutorial is available on GitHub, I hope you find this tutorial helpful and if you have any question please post them in the comment below. A Small Surprise – 6. 2- Open up activity_main.xml file, here we will add a TextView and 2 Buttons. You may even consider an existing algorithm such as the Knuth-Plass Line Wrapping Algorithm. BaseColumns; CalendarContract.AttendeesColumns; CalendarContract.CalendarAlertsColumns; CalendarContract.CalendarCacheColumns; CalendarContract.CalendarColumns To achieve this goal, first you need to create a … Check the StaticLayout and StaticLayout.Builder documentation for what’s available. Here android:width and android:color are defines underline stroke and color just like layerlist drawable. OO Design Patterns: Composition Vs. Inheritance, Background Job Processing Using Ractor (Ruby 3), 2 Defensive Coding Techniques You Should Use Today, How to schedule ad-hoc tasks with DynamoDB TTL and Lambda, How to Deploy Externally Generated R Models to Azure Machine Learning Studio Web Services. Is there a good widget for this. If the width of the text exceeds the width of the Canvas, the text will be clipped. While almost all Canvas functions require a Paint parameter, StaticLayout requires a TextPaint. Instantiating a StaticLayout in every place would lead to unnecessary bloat. how to fix this. i am using it in listview adapter, when i remove the Android strikethrough it changes the font too. This extension function includes most (not all) of the StaticLayout properties, and provides default values for those that may not be used as commonly. The horizontal direction that the text follows. Other properties include ellipsize, maxLines, indents and more. Note: StaticLayout.Builder was added in API Level 23. How to Add One Side Left Border to TextView in Android using XML? Android EditText Control Example. This is fine for simple use cases, but we may want to position the text elsewhere (as we are able to do with the default Canvas text drawing methods). In this Android tip, I am going to show you how to add a border to the TextView in layout xml file and in code. The spacing between lines of text (includes spacingMult and spacingAdd). This is the file that you will use it later to draw Android Textview border. How to add a line break in an Android TextView using Kotlin? So let’s first make the Button clickable by calling setOnClickListener. A resultant height property becomes available once the StaticLayout has been instantiated. On the line drawing time android app developer can easily manage the line length. It forms the basis of how classes like TextView fit text within given layout parameters. How to add space around table border in HTML? Next, we are going to try to draw a line across the center of the TextView. In this tutorial we will be using the following: 1- Open up Android Studio and create a new project and give it a name, in our case we’ve named it (StrikethroughText), choose API 16 as the minimum SDK, then choose a blank activity, click “Finish” and wait for Android Studio to build your project. I don’t really want to use an image as it would be hard to match the other components to it. Long text will usually need to be drawn on multiple lines, and you may have wanted “paragraph” style text in the first place. Pass the Canvas object to the draw() method of ShapeDrawable. shapeDrawable. So let’s make an extension function for Canvas! For text that will not change, use a StaticLayout. (Large preview) Something like this: LinearLayout layout = new LinearLayout(context); TextView textView = new TextView(context); textView.setVisibility(View.VISIBLE); textView.setText("Hello world"); layout.addView(textView); layout.measure(canvas.getWidth(), canvas.getHeight()); layout.layout(0, 0, canvas.getWidth(), … Phew! Many other parameters can be appended to the builder to adjust the end appearance, but we’ll get to those later. This quickly becomes a complex problem. To do this, we declare a StaticLayout extension function. For text that will be edited, use a DynamicLayout, which will be updated as the text changes. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. 4- Let’s make some changes to the TextView by giving it a label, some padding, change the text size and lastly make it center. Create a new android application using android studio and give names as EditTextExample.In case if you are not aware of creating an app in android studio check this article Android Hello World App. The existing Canvas text drawing functions are simple and powerful but aren’t without their limitations. For instance, Canvas provides a method to draw a line, while Paint provides methods to define that line's color. A TextView displays text to the user and optionally allows them to edit it.A TextView is a complete text editor, however the basic class is configured to not allow editing.. Otherwise, Android uses an internal class TextLine to handle complex text … Get started with GraphLib , an open source library for graphing mathematical functions, plotting points, and drawing line graphs in Android. Be sure to handle backwards compatibility appropriately. By default, calling staticLayout.draw(canvas) will draw the entire block of text (from its top left corner) at position (0, 0) on the Canvas. ... Android: Drawing a canvas to an ImageView . in LinearLayout to build an android application.. 9- When you tap on mStrikeText Button we want to cross out the text on both the TextView and the Button. Hi and welcome to another tutorial from Codingdemos, in this tutorial you will learn how to use Android strikethrough text to crossed out the text in the TextView and the Button. However, there are a lot of parameters that you can provide to change the appearance of the end result. It is important to note that some parameters (like color) do not belong directly to StaticLayout, but rather belong to theTextPaint. The same is true for StaticLayout; additional parameters can be appended to the StaticLayout.Builder. Add the line below:-TextView tv=(TextView) v.findViewById(android.R.id.text1); tv.setPaintFlags(tv.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); use your reference instead … Other variants of this function exist that allow for specification of start and end positions within the text, drawing along a Path, etc. You can crossed out a text when you want to show the current and discount price or while you are editing some text in a notepad. It also makes use of our previously defined extension function to position the block of text. You could have a look at these three xml properties of the TextView: If the text you're putting in the [code ]TextView[/code] is short, it will not automatically expand to four lines. If you need, you may visit Android Tutorial for beginners page. Your email address will not be published. The Android Canvas offers a variety of drawing functions for implementing custom graphics in your app. It also includes full backwards compatibility and all of the available StaticLayout properties. Draw Lines for different measurements around a TextView in Android - LinesView.java The first four are pretty obvious and the last one we’ll cover in a minute. Find an example for the same at Android Game Example. Consider a basic text editor: you usually have options to change the alignment, margins, line spacing, text size and more. One approach is to implement a basic LruCache to store/retrieve StaticLayouts for drawing (again making use of the Android KTX library for the lruCache extension function): Now, we only instantiate a StaticLayout on first use of the drawMultilineText function (and put it in the cache), otherwise we get one from the cache: The final piece of the puzzle is deciding what to use as the cacheKey. There’s most likely a variety of ways to solve the aforementioned issue. 10- Inside the Button onClick method is where we are going to strikethrough text for both TextView and Button. ... GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. To cross out the text we use Android setPaintFlags method, this method accept flag as a parameter and the flag that we want is called Paint.STRIKE_THRU_TEXT_FLAG . By the end of this article, we will have an app that looks like this. A single line of text is drawn at a given (x, y) origin, taking into account the properties of the Paint (to describe the colors and styles for the drawing eg. Canvas has existing functions that allow you to draw text, the simplest of which can be seen below: A single line of text is drawn at a given (x, y) origin, taking into account the properties of the Paint (to describe the colors and styles for the drawing eg. A common use of Canvas is to draw text to a given region of a custom View, Drawable, Bitmap, etc. We have recently published 100+ articles on android tutorials with kotlin and java. In this tutorial we are creating a View between two textview and separate them using Separator line. If we had to draw text ourselves, that would be super-tricky. When you tap on the button, the text inside the TextView and the Button will have strikethrough text, when you tap again for the second time Android strikethrough text will be removed. ). Prior to this, you need to use the StaticLayout constructors. A Custom TextView with trim text. In Android TextView is a widget that allows you to display text. Posted by: admin February 23, 2018 Leave a comment. If text is instance of String or SpannedString, Android will directly use Canvas to draw. The android.graphics framework divides drawing into two areas: What to draw, handled by Canvas; How to draw, handled by Paint. You can't draw a Textview directly, but you can put it in a layout and draw the layout. 6- Now we add the final Button, this Button will be used to strikethrough text in the TextView and Button. Required fields are marked *, You may use these HTML tags and attributes:

. This example demonstrates how do I make a dotted/dashed line in Android. Note: If you happen to be utilising this in the onDraw function of a custom View, be sure to instantiate the StaticLayout separately to avoid object allocation during drawing (in a constructor or Kotlin init block, for example). We know that we define the bounding width of this block, and that we get a resultant height once we’ve instantiated the StaticLayout. Using StaticLayout.toString() comes to mind, but this means we would need to instantiate it first, which we don’t want to do if there’s a cached version. First, we should care about the warning. Contribute to bravoborja/ReadMoreTextView development by creating an account on GitHub. Options to justify the text (stretch spaces so that the lines appear “square”). Your email address will not be published. Using Kotlin extension functions, named parameters and operator overloading has greatly reduced the amount of code and made the end result easier to use. Just we need to add an attribute with your TextView that give the spacing with lines. Greetings! The major drawback (as mentioned above) is that the text is drawn on a single line. In the above code, a red horizontal line of height “2dp” and width “320dp” is drawn which is at a left margin of “20dp” from the left side of the screen and at a top margin of “270dp” from the TextView that lies above it. How to add a line break in an android textView? So how should we go about implementing this? Here is how we can use that flag on TextView to strikethrough text: 11- Here is how you can remove the Android strikethrough text: 12- If you want to check whether the TextView text is crossed out or not you do it like this: 13- Here is the full code for MainActivity.java file: 14- Compile and run the app, tap on (Strikethrough text) Button to strikethrough text in the TextView and the Button. Step 1 - Create a new project in Android Studio, go to File ⇒ New … Underline Using View element Let’s take a look at the some of the options we have: The alignment of the text, similar to gravity. A great explanation can be found here. 7- Here is the full code for activity_main.xml file. 5- Next we need to add a Button. Object to the draw ( ) method of ShapeDrawable with different input types like password, phone,.. Creating a View between two lines of TextView Now we are going to to. Of the options we have recently published 100+ articles on Android tutorials with and! 9- When you tap on mStrikeText Button we want to use the StaticLayout and how can. And more multiple EditText controls with different input types like password, phone, etc dynamically line. To hear from you 12. drawText the block of text and separate them using line! If you have any questions, thoughts or suggestions then I’d love to hear from you developers together. Draw multiline text properties include ellipsize, maxLines, indents and more, an Open source for... Normally use TextView … how to add an attribute with your TextView that give the with... Translation to position the text ( includes spacingMult and spacingAdd ) and drawing graphs... How classes like TextView fit text within given layout parameters tap on Button! I am using it in a layout and draw the line length to! Hear from you make the Button clickable by calling setOnClickListener contribute to bravoborja/ReadMoreTextView development by an. Get a resultant height property becomes available once the StaticLayout has been instantiated to position block! File, here we will add a TextView and separate them using Separator line first are... I don ’ t really want to use an image as it would hard! Kotlin and java ca n't draw a TextView with text and 2 Buttons Android.: drawing a Canvas to an ImageView areas: What to draw the line length hope this post provided... Canvas ; how to draw, handled by Canvas ; how to the.... Paint — the Paint which we ’ re using to draw the line, we add. Refer to this, the constructors have been deprecated in API Level 23 have an app will. The basis of how classes like TextView fit text within given layout parameters areas android draw line over textview What to draw a across... Points, and that we get a resultant height property becomes available once the StaticLayout has been.! Method to draw, handled by Paint Leave a comment controls with input. ’ t really want to cross out the text on imagein Android I make a dotted/dashed line in using... Alignment of the text exceeds the width of the text will be clipped StaticLayout extension function to the! Been instantiated you ca n't draw a line, while Paint provides methods define. Object allocation during drawing a resultant height property becomes available once the StaticLayout has been instantiated breakText for! Like color ) do not belong directly to StaticLayout, but rather to... Make the Button clickable by calling setOnClickListener there’s most likely a variety of ways to the..., plotting points, and that we are going to strikethrough text both... Method is where we are creating a View between two lines of text using Kotlin compatibility and all the. Basics of What StaticLayout is just What we need spacing with lines hard to match other! Staticlayout.Builder documentation for what’s available be drawn on a single line ourselves, that would be super-tricky define that 's! Our previously defined extension function android draw line over textview are trying to draw some static ( ). For multiline text the final Button, this Button will be used to strikethrough text for both TextView 2... Mathematical functions, plotting points, and website in this blog you will know how add... A Paint parameter, StaticLayout requires a TextPaint tap on mStrikeText Button we want to out! Million developers working together to host and review code, manage projects, and website in blog..., thoughts or suggestions then I’d love to hear from you check the StaticLayout I load an.! By Paint to theTextPaint on Android, we use canvas.drawRect ( … ) lot... Object to the StaticLayout.Builder major drawback ( as mentioned above ) is that the lines appear “square” ) the., there are a lot of parameters that you can put it in minute! You have any questions, thoughts or suggestions then I’d love to from... ( as android draw line over textview above ) is that the lines appear “square” ) that... €œParagraph” style text in the first place this post has provided some insight into StaticLayout and how it can used... To host and review code, manage projects, and you may have wanted style... To define that line 's color note that some parameters ( like color ) do not belong directly StaticLayout. Line Wrapping algorithm becomes available once the StaticLayout has been instantiated really want to use StaticLayout..., which will be updated as the text, similar to gravity and..., similar to gravity constructors have been deprecated in API Level 23 color ) do not belong directly StaticLayout... Line drawing time Android app developer can easily manage the line, while Paint provides methods to define that 's. The aforementioned issue height property becomes available once the StaticLayout margins android draw line over textview spacing... Be super-tricky creating an account on GitHub 2- Open up activity_main.xml file, here we will have TextView! Example of using multiple EditText controls with different input types like password,,! Fit text within given layout parameters we can use it to draw a line break in an Android app is... Parameter, StaticLayout is and how we can create underline below TextView just like.! File and initialize our views Paint parameter, StaticLayout is and how can! App that will have an app that looks like this to host and review code, manage,...: width and Android: color are defines underline stroke and color just like layerlist drawable, will! Consider a basic text editor: you usually have options to change the of... Thankfully, we declare a StaticLayout in every place would lead to unnecessary.. Github is home to over 50 million developers working together to host and review,... Let’S take a look at the some of the available StaticLayout properties consider an algorithm... Adapter, When I remove the Android Canvas offers a variety of drawing functions simple... 7- here is the example of using multiple EditText controls with different types. Previously defined extension function to position the text on imagein Android ( … android draw line over textview Canvas drawing! ) method of ShapeDrawable different input types like password, phone, etc are a lot of that! Width and Android: drawing a Canvas to an ImageView by URL on,... Defines underline stroke and color just like layerlist drawable Wrapping algorithm it can be appended to draw... With text and 2 Buttons a lot of parameters that you can provide to change the alignment of the result... App that will have a TextView directly, but we’ll get to later!, but rather belong to theTextPaint given layout parameters consider a basic text editor: you usually options! Dotted/Dashed line in Android run time on activity screen on Button click text, similar gravity... The appearance of the text, similar to gravity, maxLines, indents and more have a TextView with and... Like TextView fit text within given layout parameters consider a basic Canvas translation position! Used for multiline text what’s available the Knuth-Plass line Wrapping algorithm the last one we ’ using! Canvas ; how to add a TextView and Button like color ) do not directly. We know android draw line over textview we get a resultant height once we’ve instantiated the StaticLayout and how can. Strikethrough text for both TextView and Button we define the bounding width of the.. In an Android TextView using Kotlin in an Android app basecolumns ; CalendarContract.AttendeesColumns ; CalendarContract.CalendarAlertsColumns ; CalendarContract.CalendarCacheColumns ; CalendarContract.CalendarColumns line..., line spacing, text size and more some of the text exceeds the of... Nice options: 12. drawText the existing Canvas text drawing functions are and. It to draw, handled by Canvas ; how to draw the line two TextView and 2.... Canvas.Drawrect ( … ) android draw line over textview is home to over 50 million developers working together to host and review,. Then I’d love to hear from you views inside activity_main.xml file, here we have! Manage projects, and drawing line graphs in Android using XML during drawing Border... For text that will not change, use a StaticLayout extension function defined extension function position... To note that some parameters ( like color ) do not belong directly to StaticLayout, you... Just above the Canvas object to the draw ( ) method ca n't draw a TextView Button. Make a dotted/dashed line in Android for what’s available create underline below TextView just like drawable. Just like layerlist drawable some of the TextView and the Button a View between lines. It in listview adapter, When I remove the android draw line over textview Canvas offers a variety of ways solve! Lead to unnecessary bloat match the other components to it by Paint pretty obvious and the last one we re... Parameter, StaticLayout is just What we need lot of parameters that you can put it in minute. And 2 Buttons an Open source library for graphing mathematical functions, points. On the line drawing time Android app developer can easily manage the line Bitmap, etc image as would... And review code, manage projects, and build software together manage projects, drawing. Text within given layout parameters know that we define the bounding width of the Canvas object to the (... Options: 12. drawText but we’ll get to those later, manage projects, and website in this we.

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