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drawing chat android

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Designing Android Chat Bubble (Chat UI) - CodeProject

The most important part of a custom view is its appearance. Custom drawing can be easy or complex according to your application's needs. This lesson covers some drawing chat android the most common operations. Beyond this lesson, you can find additional related information at Canvas and Drawables.

The most important step in drawing a custom view is to override the onDraw method. The parameter to onDraw is a Canvas object that the view can use to draw itself, drawing chat android. Drawing chat android Canvas class defines methods for drawing text, lines, bitmaps, and many other graphics primitives.

You can use these methods in onDraw to create your custom user interface UI. Before you can call any drawing methods, though, it's necessary to create a Paint object. The next section discusses Paint in more detail.

The android. For instance, Canvas provides a method to draw a line, while Paint provides methods to define that line's color. Canvas has a method to draw a rectangle, while Paint defines whether to fill that rectangle with a color or leave it empty. Simply put, Canvas defines shapes that you can draw on the screen, while Paint defines the color, style, font, and so forth of each shape you draw. So, before you draw anything, you need to create one or more Paint objects. The PieChart example does this in a method called initwhich is called from the constructor from Java, but we can initialise inline in Kotlin:.

Creating objects ahead of time is an important optimization. Views are redrawn very frequently, and many drawing objects require expensive initialization. Creating drawing objects within your onDraw method significantly reduces performance and can make your UI appear sluggish. In order to properly draw your custom view, you need to know what size it is.

Complex custom views often drawing chat android to perform multiple layout calculations depending on the size and shape of their area on screen.

You should never make assumptions about the size of your view on the screen. Even if only one app uses your view, that app needs to handle different screen sizes, multiple screen densities, and various aspect ratios in both portrait and landscape mode.

Although View has many methods for handling measurement, most of them do not need to be overridden. If your view doesn't need special control over its size, you drawing chat android need to override one method: onSizeChanged. Calculate positions, dimensions, and any other values related to your view's size in onSizeChangedinstead of recalculating them every time you draw.

In the PieChart example, onSizeChanged is where the PieChart view calculates the bounding rectangle of the pie chart and the relative position of the text label and other visual elements.

When your view is assigned a size, the layout manager assumes that the size includes all of drawing chat android view's padding. You must handle the padding values when you calculate your view's size, drawing chat android. Here's a snippet from PieChart. If you need finer control over your view's layout parameters, implement onMeasure, drawing chat android.

This method's parameters are View. MeasureSpec values that tell you how big your view's parent wants your view to be, and whether that size is a hard maximum or just a suggestion, drawing chat android.

As an optimization, these values are stored as packed integers, and you use the static methods of View. MeasureSpec to unpack the information stored in each integer. Here's an example implementation of onMeasure. In this implementation, drawing chat android, PieChart attempts to make its area big enough to make the pie as big as its label:, drawing chat android.

Once you have your object creation and measuring code defined, you can implement onDraw. Every view implements onDraw differently, but there are some common operations that most views share:.

For example, here's the code that draws PieChart. It uses a mix of text, lines, and shapes. Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app.

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drawing chat android


Drawing Chat for Android - Custom drawing can be easy or complex according to your application's needs. This lesson covers some of the most common operations. Beyond this lesson, you can find additional related information at Canvas and Drawables. Override onDraw() The most important step in drawing a custom view is to override the onDraw() method. I don't even understand what drawing over other apps means. Is it the floating hearts in a GIF in a private message in. Stack Exchange Network. Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. What does “Drawing over other apps” mean? Ask Question.