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Drawing to a View is the Right Option if Developers Need to Draw Simple Graphics

By Robert Woodard Subscribe to RSS | March 20th 2012 | Views:
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During the Android app development procedure, it is essential for Android developers to understand the accurate graphical requirements of the application they are building. The graphical tasks can be done by using different techniques. The strategy of implementing graphics and animations regarding static application is absolutely diverse from the one of utilizing graphics plus animations for an interactive game. Several options made available for drawing graphics on an Android device and also graphics providing the finest output get a general look in this informative article.

Android gives a collection of View widgets. This set is offered basically for general usefulness of the wide variety of User Interfaces. Android developers can extend these widgets to change the way they look or even respond. Android application development presents flexibility to the developers to perform their own custom 2D rendering and that is attained with the use of drawing techniques that are incorporated in Canvas class. Drawable objects regarding stuff like textured control keys or frame-by-frame animations can additionally be created by Android app developers. Android 3.0 is capable of providing hardware development to the majority of the drawing performed by the Canvas APIs using which their efficiency can certainly be enhanced.

Android facilitates OpenGL ES 1.0 and 2.0, along with Android framework APIs and even natively with the Native Development Kit (NDK). The developers have to work with APIs in two cases: If a few graphic innovations that are not reinforced with Canvas APIs have to be included the app plus if developers without expecting outstanding performance require only platform freedom.

Even so, for various graphic intensive apps for example games, utilisation of the NDK is effective over the utilization of framework APIs. Even so there are some apps for example Google Body app that is developed employing framework APIs and is fairly capable of running efficiently together with the framework APIs. OpenGL along with the NDK becomes a helping hand whenever the developers have a great deal of native code as well as they require to port over to Android.

There are two techniques by means of which Android developers can draw 2D graphics through a set 2D drawing APIs. To draw graphics or animations into a View object from layout is the first technique. This method implies that the system's standard View hierarchy drawing process handles the drawing of your graphics and that developer simply requires to specify the graphics to go inside of the View during the course of Android development UK.

The developers are able to draw the graphics straight to a Canvas in the second method. This will make the developers invoke the proper class's onDraw() method - passing it Canvas, or one of the Canvas draw...() methods like drawPicture(). The developers can command any sort of animation with this technique.

For Android developers of London, the correct choice will be to draw to a View whenever they want to draw simple graphics which do not change dynamically and also which aren't a component of performance-intensive game. The developers are able to draw the graphics into a view when it is about display a static graphic as well as predefined animation with an otherwise static application.

Drawing to Canvas is suitable when app has to frequently re-draw itself. The Canvas by itself needs to draw applications for instance video games. In the same thread, as part of UI Activity, developers can construct a custom View component in layout, call invalidate() as well as afterward manage the onDraw() callback. The developers don't need to demand invalidate() in an independent thread since they control a Surface View and carry out draws to the Canvas according to speed of the thread.

Robert Woodard - About Author:
The writer is actually a marketing manager with a well known Android Apps Developers In London. She has been also associated with leading tech newspapers.

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