Download e-book for iPad: Learning Android Canvas by Mir Nauman Tahir
By Mir Nauman Tahir
Whilst you’re writing an program within which you wish to practice really good drawing and/or regulate the animation of pics, you'll want to achieve this via drawing via a canvas. A canvas works for you as an interface to the particular floor upon which your snap shots can be drawn-it holds all your “draw” calls. through the Android Canvas, your drawing is de facto played on an underlying Bitmap, that's positioned into the window.
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Extra resources for Learning Android Canvas
The reader will be able to create a simple application displaying an image on the screen and will have a basic understanding of the different sections of the project. He/she will also have gained knowledge about which file to use for what purpose and where to find it. The reader will also have gained some basic knowledge of screens and densities; thus, while designing and using graphics in an application, the reader will use this information to make better decisions about designing the user interface of the application.
The need to add so much text to the button is to make it multiline; this will enable us to see the stretching effect of the NinePatch image. The following screenshot shows the button with the stretched NinePatch image in the background: [ 52 ] Chapter 4 Up until now, it is clear that we will use the NinePatch images mostly for dealing with our background graphics; especially when we don't know the width and height of the content that we want it to contain. So the next thing that we will do is change the whole background of our application's main activity.
Now the tasks that are running on our thread are not on the UI thread and therefore they don't have access to UI objects. To give our tasks access to the UI objects on the UI thread, we must use something with which we can move data from the background thread to the UI thread. If a thread is running in the background and it needs to change something on the UI, it can't do that by itself but will use the facility provided by runOnUiThread, which will enable us to run the code inside a background thread on the main UI thread.
Learning Android Canvas by Mir Nauman Tahir