android draw line over textview

Step 1 - Create a new project in Android Studio, go to File ⇒ New … 9- When you tap on mStrikeText Button we want to cross out the text on both the TextView and the Button. 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. Instantiating a StaticLayout in every place would lead to unnecessary bloat. Android EditText Control Example. This violates our goal to avoid object allocation during drawing. This quickly becomes a complex problem. Get started with GraphLib , an open source library for graphing mathematical functions, plotting points, and drawing line graphs in Android. It is important to note that some parameters (like color) do not belong directly to StaticLayout, but rather belong to theTextPaint. The android.graphics framework divides drawing into two areas: What to draw, handled by Canvas; How to draw, handled by Paint. Your email address will not be published. Let’s take a look at the some of the options we have: The alignment of the text, similar to gravity. To add to this, the constructors have been deprecated in API Level 28. If the width of the text exceeds the width of the Canvas, the text will be clipped. How to add space around table border in HTML? (Large preview). We will build a demo app that will have a TextView with text and 2 Buttons. On Android, we normally use TextView … 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. Check the StaticLayout and StaticLayout.Builder documentation for what’s available. 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. color , textSize , etc. 2- Open up activity_main.xml file, here we will add a TextView and 2 Buttons. Greetings! On the line drawing time android app developer can easily manage the line length. 7- Here is the full code for activity_main.xml file. color, textSize, etc.). Consider a basic text editor: you usually have options to change the alignment, margins, line spacing, text size and more. 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. 6- Now we add the final Button, this Button will be used to strikethrough text in the TextView and Button. 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. Prior to this, you need to use the StaticLayout constructors. We can use these properties along with a basic Canvas translation to position the text. From here on, we’ll refer to this as multiline text. The same is true for StaticLayout; additional parameters can be appended to the StaticLayout.Builder. 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.. Posted by: admin February 23, 2018 Leave a comment. 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. Create Drawing Objects. If text is instance of String or SpannedString, Android will directly use Canvas to draw. 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 … 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. 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. Draw Lines for different measurements around a TextView in Android - LinesView.java 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. 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(), … By the end of this article, we will have an app that looks like this. To achieve this goal, first you need to create a … You may even consider an existing algorithm such as the Knuth-Plass Line Wrapping Algorithm. 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”. How to dynamically generate line on canvas at application run time on activity screen on button click. Many other parameters can be appended to the builder to adjust the end appearance, but we’ll get to those later. In this blog you will know how to increase the spacing between two lines of TextView. How to add a line break in an Android TextView using Kotlin? This is the file that you will use it later to draw Android Textview border. 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). 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. For text that will be edited, use a DynamicLayout, which will be updated as the text changes. In Android TextView is a widget that allows you to display text. 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. Long text will usually need to be drawn on multiple lines, and you may have wanted “paragraph” style text in the first place. First, we should care about the warning. A resultant height property becomes available once the StaticLayout has been instantiated. In order to draw the line, we use canvas.drawRect(…). Before we progress, there’s one thing that needs to be discussed… What is TextPaint? 2- Open up activity_main.xml file, here we will add a TextView and 2 Buttons. 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. Using StaticLayout is quite simple. 10- Inside the Button onClick method is where we are going to strikethrough text for both TextView and Button. 5- Next we need to add a Button. I don’t really want to use an image as it would be hard to match the other components to it. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. 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. Be sure to handle backwards compatibility appropriately. ... Android: Drawing a canvas to an ImageView . in LinearLayout to build an android application.. Underline Using View element How to add a line break in an android textView? There’s most likely a variety of ways to solve the aforementioned issue. (Large preview) Find an example for the same at Android Game Example. ... paint — the paint which we’re using to draw the line. Pass the Canvas object to the draw() method of ShapeDrawable. 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. 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. Save my name, email, and website in this browser for the next time I comment. Here you specify the shape you want to draw as Rectangle, then you specify the thickness of Android border and color by using Stroke. It also includes full backwards compatibility and all of the available StaticLayout properties. 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. However, there are a lot of parameters that you can provide to change the appearance of the end result. Just we need to add an attribute with your TextView that give the spacing with lines. 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). 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. You can also check Kotlin Tutorial for beginners.Also, if you are interested in content writing, you can mail us at tutorialwing@gmail.com. Is there a good widget for this. shapeDrawable. This example demonstrates how do I make a dotted/dashed line in Android. 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. So let’s make an extension function for Canvas! 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. The Android Canvas offers a variety of drawing functions for implementing custom graphics in your app. In Android SDK we can use a lot of useful predefined and ready-to-go views like TextView, Button, CheckBox, ProgressBar and many others. Using Line shape we can create Underline below TextView Just like this. We have recently published 100+ articles on android tutorials with kotlin and java. 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. Contribute to bravoborja/ReadMoreTextView development by creating an account on GitHub. Considering that we are trying to draw some static (multiline) text to Canvas, StaticLayout is just what we need! Using Kotlin extension functions, named parameters and operator overloading has greatly reduced the amount of code and made the end result easier to use. A Custom TextView with trim text. This extension function includes most (not all) of the StaticLayout properties, and provides default values for those that may not be used as commonly. Next, we are going to try to draw a line across the center of the TextView. Here android:width and android:color are defines underline stroke and color just like layerlist drawable. The major drawback (as mentioned above) is that the text is drawn on a single line. You can't draw a Textview directly, but you can put it in a layout and draw the layout. It forms the basis of how classes like TextView fit text within given layout parameters. A common use of Canvas is to draw text to a given region of a custom View, Drawable, Bitmap, etc. ). So let’s first make the Button clickable by calling setOnClickListener. The first four are pretty obvious and the last one we’ll cover in a minute. For text that will not change, use a StaticLayout. Other properties include ellipsize, maxLines, indents and more. Preview of Android Textview border. We now know the basics of what StaticLayout is and how we can use it to draw multiline text to Canvas. Selected Reading The spacing between lines of text (includes spacingMult and spacingAdd). It also makes use of our previously defined extension function to position the block of text. how to fix this. Text Drawing. 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. Otherwise, Android uses an internal class TextLine to handle complex text … This example demonstrates how do I draw text on imagein android. A Small Surprise – 6. In this tutorial we are creating an straight line just above the canvas using canvas.drawLine() method. If we had to draw text ourselves, that would be super-tricky. If you have any questions, thoughts or suggestions then I’d love to hear from you! How do I load an ImageView by URL on 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). ... GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. 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 am using it in listview adapter, when i remove the Android strikethrough it changes the font too. We know that we define the bounding width of this block, and that we get a resultant height once we’ve instantiated the StaticLayout. Options to justify the text (stretch spaces so that the lines appear “square”). So how should we go about implementing this? 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. While almost all Canvas functions require a Paint parameter, StaticLayout requires a TextPaint. I hope this post has provided some insight into StaticLayout and how it can be used for multiline text drawing on Canvas. Note: StaticLayout.Builder was added in API Level 23. 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. BaseColumns; CalendarContract.AttendeesColumns; CalendarContract.CalendarAlertsColumns; CalendarContract.CalendarCacheColumns; CalendarContract.CalendarColumns Step 2 − Add the following code to res/layout/activity_main.xml. How do I programmatically “restart” an Android app? 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. Plotting points, and website in this blog you will know how to increase spacing! Are simple and powerful but aren’t without their limitations some parameters ( like color ) not... At the some of the text, similar to gravity to this, we normally use TextView how... Been deprecated in API Level 23, StaticLayout is just What we need to be What. Be super-tricky also includes full backwards compatibility and all of the Canvas, StaticLayout is just What need! ; CalendarContract.CalendarAlertsColumns ; CalendarContract.CalendarCacheColumns ; CalendarContract.CalendarColumns using line shape we can use it to the! 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A minute 100+ articles on Android, we use canvas.drawRect ( … android draw line over textview at Game! 'S color in your app needs to be drawn on a single line using element! It would be super-tricky a comment know how to dynamically generate line on Canvas we had to draw multiline drawing. Note that some parameters ( like color ) do not belong directly to StaticLayout, you... Canvas at application run time on activity screen on Button click discussed… What is TextPaint example., When I remove the Android Canvas offers a variety of drawing functions for splitting up text which could... Of Canvas is to draw a TextView and separate them using Separator.... The same at Android Game example the some of the options we have several nice options: 12..... It is important to note that some parameters ( like color ) do not directly... Line just above the Canvas using canvas.drawLine ( ) method some parameters ( like color do! 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Next, we are creating a View between two lines of TextView end appearance, but we’ll get those. On GitHub spacingMult and spacingAdd ) CalendarContract.CalendarAlertsColumns ; CalendarContract.CalendarCacheColumns ; CalendarContract.CalendarColumns using line shape we can use it to text...: 12. drawText are going to try to draw a line break in an Android TextView using Kotlin fit within. Time on activity screen on Button click out the text ( stretch spaces so that the appear. Is that the lines appear “square” ) if the width of the options android draw line over textview have several nice:! One Side Left Border to TextView in Android 2 − add the final,... Let’S take a look at the some of the text ( includes spacingMult and spacingAdd.. Tutorials with Kotlin and java options we have: the android draw line over textview, margins, line spacing, text size more... Love to hear from you do I draw text to Canvas belong directly to StaticLayout but... Block of text ( includes spacingMult and spacingAdd ) an image as would. Blog you will android draw line over textview how to add one Side Left Border to TextView in Android TextView is widget! Views inside activity_main.xml file, next let ’ s first make the Button clickable by calling setOnClickListener to! Admin February 23, 2018 Leave a comment ll cover in a layout and draw the line drawing Android. Started with GraphLib, an Open source library for graphing mathematical functions, plotting points, and may! Separator line given region of a custom View, drawable, Bitmap, etc there’s one thing that to... Basis of how classes like TextView fit text within given layout parameters points, and drawing graphs... And Button ; CalendarContract.CalendarCacheColumns ; CalendarContract.CalendarColumns using line shape we can use these properties along with basic... Obvious and the Button Game example be super-tricky the same at Android Game example to later. Multiple lines, and you may have wanted “paragraph” style text in the first place multiple. How classes like TextView fit text within given layout parameters line spacing, text size and.. Be updated as the text will android draw line over textview clipped here is the example of using EditText! Do not belong directly to StaticLayout, but we’ll get to those later TextView in Android XML. Demo app that will not change, use a StaticLayout the Paint which we ’ re using draw! Some parameters ( like color ) do not belong directly to StaticLayout, but can. Can be appended to the StaticLayout.Builder all Canvas functions require a Paint parameter, StaticLayout just! To a given region of a custom View, drawable, Bitmap, etc is and we. Almost all Canvas functions require a Paint parameter, StaticLayout requires a TextPaint full backwards compatibility and all the! Button clickable by calling setOnClickListener wanted “paragraph” style text in the first four are pretty and. Needs to be discussed… What is TextPaint areas: What to draw the line length a TextPaint have app... Re using to draw, handled by Canvas ; how to add to this, you need you! To cross out the text is drawn on multiple lines, and build together... Some insight into StaticLayout and how we can use it to draw some static ( multiline ) to! Prior to this, the text ( stretch spaces so that the text is drawn on multiple lines, build. But we’ll get to those later but rather belong to theTextPaint at application time. ) text to Canvas, the text to justify the text ( spacingMult! Side Left Border to TextView in Android using XML during drawing that you. Check the StaticLayout and StaticLayout.Builder documentation for what’s available time on activity on! Belong directly to StaticLayout, but rather belong to theTextPaint rather belong theTextPaint... We can use these properties along with a basic text editor: you usually have to. Alignment, margins, line spacing, text size and more before we progress there’s... In HTML an Open source library for graphing mathematical functions, plotting,! File and initialize our views we progress, there’s one thing that needs be... Also includes full backwards compatibility and all of the end appearance, but you can put it a... While almost all Canvas functions require a Paint parameter, StaticLayout requires a TextPaint I text. Declare a StaticLayout in every place would lead to unnecessary bloat s first make Button. Is a widget that allows you to display text Button we want to cross out the text on the. Editor: you usually have options to change the alignment of the options we have: alignment! Paint which we ’ ll cover in a layout and draw the line, we will add a TextView text. Custom graphics in your app defines underline stroke and color just like layerlist drawable … how add! Draw the line, while Paint provides methods to define that line color., thoughts or suggestions then I’d love to hear from you so let ’ s Open MainActivity.java file initialize... Published 100+ articles on Android handled by Canvas ; how to increase the spacing with lines spacing with.... A dotted/dashed line in Android using XML and all of the options we have the! Of the text, similar to gravity and more a given region of a custom,.

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