Top 11 android interview questions and answers for 2018. The images can be sliced up into even smaller pieces. Create drawable from raw ninepatch data, setting initial target density based on the display metrics of the resources. Here i am sharing my experience of working with drawable resources in android, through this article you will learn to use bitmap and nine patch drawable resources which is the first two of ten resources available in android. A ninepatchdrawable graphic is a stretchable bitmap image, which android will automatically resize to accommodate the contents of the view in which you have placed it as the background. It is a resizable bitmap resource that can be used for backgrounds or other images on the device. Mar 27, 2017 in creating android chat bubbles, nine patch image plays a crucial role. To include 9patch splash images in your android applications follow these steps. Create a ninepatchninepatchdrawable in runtime stack overflow. I am trying to create 9patch images using bitmaps on the device. Android 9patch imageshow they work and how to create them. A nine patch 9 patch image is a bitmap that has a single pixel wide border around the entire image. Due to these reasons, the use of nine patch 9 patch images are highly entertained. Nine patch refers to the way you can change the size of the image.
A simple guide to 9patch for android ui radley marx. How is nine patch image different from a regular bitmap. Interview question for junior android developer in kolkata. Nine patch is a stretchable bitmap image, and which android automatically resizes to accommodate the contents of the view. Create resizable 9 patch images android studio tutorial youtube.
Ninepatch to ensure that the drawable has correctly set its target density. As a nine patch graphic is resized or its aspect ratio is changed, it keeps the corners intact, stretches the sides, and expands the center as needed. The tool draw 9patch is done for easy making 9patch images and is a part. How is the nine patch image different from a regular bitmap. Android may stretch the image when displaying the splash screen. This is a multipart series, all focusing on android interview questions, for both fresher and experienced as well. Android nine patch image example java, android develop. After a little while, i finally picked up on how it works and decided to throw together something to help others figure it out. In general, a ninepatch image allows resizing that can be used as background or other image size requirements for the target device. Here i am sharing my experience of working with drawable resources in android, through this article you will learn to use bitmap and ninepatch drawable resources which is the first two of ten resources available in android. How the ninepatch image different from a regular bitmap. To create a 9 patch image you need to start with a.
Ninepatchdrawablebitmap bitmap, byte chunk, rect padding, string. Is there a way to use a higher res image with nine patch, such that the fixed portions of the image display at the full resolution of the device. Ninepatch image is a bitmap which stretches to fit the content posted in the view where it is applied as a background. A simple guide to 9patch for android ui while i was working on my first android app, i found 9patch aka 9. How to publish android apps into an android market. The draw 9 patch tool is a wysiwyg editor included in android studio that allows you to create bitmap images that automatically resize to accommodate the contents of the view and the size of the screen. How the ninepatch image different from a regular bitmap glassdoor. The ninepatch class allows drawing a bitmap in nine. Lets see the common and some importance android interview questions and answers for 2018 and beyond by expert android developers. Im having trouble getting this to work for android using a 9 patch image, but it looks like the image is being scaled. In general, a nine patch image allows resizing that can be used as background or other image size requirements for the target device. Different between ninepatch image vs regular bitmap image. You can now run the project on your android device or simulator to see the splash 9 patch image working.
However, im having trouble getting this to work for android using a 9patch image, but it looks like the image is being scaled normally, not respecting the guides i have in the image. Nine patch image is an android special image format which can make the background image scaled correctly. As shown in figure 5, the intersection between the black lines on the left and top edge is the area of the bitmap that can be stretched. These are referred to as nine patch graphics, since they have nine distinct regions. Im a webdeveloper, looking for the best experience, working between development and design. Mar 03, 2017 creating 9 patch image in android studio creating 9 patch png image i. Nine patch bitmaps are another, very useful way of customizing the appearance of android views. In most cases the backgrounds must be able to scale correctly for different size screens on a variety of devices. The draw 9patch tool is a wysiwyg editor included in android studio that allows you to create bitmap images that automatically resize to accommodate the contents of the view and the size of the screen. A nine patch is like any png image but contains an extra 1pixelwide border. Jul 12, 2012 due to these reasons, the use of nine patch 9 patch images are highly entertained. Nine patch image is a bitmap which stretches to fit the content posted in the view where it is applied as a background. With that explanation and the advent of css3 you might think that there is no reason to use 9 patch images but the name 9 patch is a misnomer. Android 9 patch image files for buttons and borders tek eye.
The ninepatch class allows drawing a bitmap in nine sections. In your multidevice application, go to project options application to. Alternatively, what is the difference between nine patch image vs regular bitmap image. Now let us see, how the application shown in figure3 is developed. A nine patch 9patch image is a bitmap that has a single pixel wide border around the entire image. Nine patch images are especially useful when designing buttons. This api supports the mono for android infrastructure and is not intended to be used directly from your code.
In your multi device application, go to project options application to open the application options. Ninepatch class permits drawing a bitmap in nine sections. You can use 9patch images in the splash screens of your android applications. The tool draw 9patch is done for easy making 9patch images and is a part of android sdk. The android sdk lets you use bitmap graphics that have stretchable and fixed regions. A nine patch bitmap is basically a standard png file, but with an extra 1px border that indicates which pixels should be stretched and with a. In your multidevice application, go to project options application to open the. Display a toast message in the top of the page in my android application. Different between ninepatch image vs regular bitmap image in android.
What is the difference between a regular bitmap and a nine patch image. What is the difference between a regular bitmap and a nine. The use of 9 patch images for android development is to help keep the app lower in the size. Create a drawable projection from a bitmap to nine patches. Android 9 patch image files for buttons and borders. Nine patch generator for android an online tool to create 9. Getting started in android development part 10 nine patch. Verifies that the specified byte array is a valid 9 patch data chunk. As a ninepatch graphic is resized or its aspect ratio is changed, it keeps the corners intact, stretches the sides, and expands the center as needed. A 9patch image file is a specially formatted file so that android knows which areasportions of the image can or cannot be scaled. It is one of a resizable bitmap resource which is being used as backgrounds or other images on the device. Top android interview questions to prepare in 2020 edureka blog.
An example use of a ninepatch is the backgrounds used by standard android buttons buttons must stretch to accommodate strings of various lengths. This is the first time i use ninepatch image on my android app. How to get an android splash screen implemented using a 9. You can use 9 patch images in the splash screens of your android applications. The ninepatch class permits drawing a bitmap in nine or more sections. The corners remain unscaled, the sides are scaled in one direction and the center is. Adding 9 patch images to your android splash screen. Hbbtv development how to make an app compatible on every device.
Usually, a ninelink image allows reuse, which can be used for background device or other image size requirements. How is the ninepatch image different from a regular bitmap. A nine patch drawable graphic is a stretchable bitmap image, which android will automatically resize to accommodate the contents of the view in which you have placed it as the background. How to get source code from an apk file in android. Nine patch a ninepatchdrawable graphic is a stretchable bitmap image, which android will automatically resize to accommodate the contents of the view in which you have placed it as the background. But when i build the application on real device htc inspire 4g, htc explorer. Nine patch generator for android nine patch is a stretchable bitmap image, and which android automatically resizes to accommodate the contents of the view. The draw 9patch tool is a wysiwyg editor included in android studio that allows you to create bitmap images that automatically resize to. A resizeable bitmap, with stretchable areas that you define. Alternatively, what is the difference between ninepatch image vs regular bitmap image. The question is then, how do one formatgenerate the chunk from an existing bitmap containing the ninepatch information ive searched through the android.
May 18, 2011 a simple guide to 9 patch for android ui while i was working on my first android app, i found 9 patch aka 9. The ninepatch class permits drawing a bitmap in nine sections. Use ninepatchdrawableresources, bitmap, byte, rect. The ninepatch refers to the way you can resize the image. Android 9patch imageshow they work and how to create them everyone seems to be interested in how android deals with multiple screen sizes and pixel densities, after all, android comes in thousands of different. A ninepatch image in android studios draw 9patch tool. This border provides metadata for the bitmap itself. May 26, 2011 your nine patch images must be saved with the. The patch 9 drawable is intended to create a drawable that will scale well across different dimensions its very useful for buttons in particular. See providing resources and supporting multiple screens documentation on the android developers site. This list has been put together after careful research and under the thorough guidance of android certification experts, who have worked in the industry for several years and have conducted many interviews for different android job roles.
A ninepatch drawable is a standard png image that includes an extra 1pixelwide border. Progressdialog will not open in activitygroup in a. This is the first time i use nine patch image on my android app. Nine patch generator for android an online tool to. To include 9 patch splash images in your android applications follow these steps. But when i build the application on real device htc inspire 4g, htc. Jpegs dont make good 9 patch images because they blur colors. Android interview questions and answers, android multiple choice pdf for freshers and experienced.
Jul 16, 2012 to create a 9 patch image you need to start with a. How to create 9 patch images chrislondon9patchimagefor. You can imagine a scenario where a bitmap is used as a background for a textview. In this video we will learn, how to create resizable 9patch png images in android studio, which dont look stretched or distorted when. Forms app with a 9patch image so that the core of the image remains at its set size regardless of screen size, but with the edges being expanded to fill the screen or that is the hope. Start with a png image, put it in any drawable folder in your project. A 9 patch image is a stretchable bitmap image with. What is the variance between a regular bitmap and a nine patch image. The byte is the raw data of the png 9patch extension chunk that we defined for android. So the image can be used in different size android devices. How to check if sim card exists in the android dev. What is the difference between a regular bitmap and a ninepatch image. A ninepatchdrawable graphic is a stretchable bitmap image, which android will automatically resize to accommodate the contents of the view in which you have placed it as the.
Create resizable bitmaps 9patch files android developers. A bitmap image is simply just a collection of colored pixels in a specific order. Usually, a nine link image allows reuse, which can be used for background device or other image size requirements. Browse other questions tagged java android bitmap nine patch or ask your own question. Q87 what is the difference between regular bitmap and nine patch. So the image can be used in different size android devices such as mobile phone, android pad etc. This article will show you how to use the android studio nine patch tool to create and use the nine patch image. One huge benefit of the 9 patch image is the ability to define what can be stretched. How is ninepatch image different from a regular bitmap. The nine patch refers to the way you can resize the image. This way you can have a content appear without distortion whatever aspect ratio the target device screen has. For example, if your application provides bitmap drawables only for the baseline, medium screen density mdpi, then the system scales them up when on a high. When you save from the draw 9 patch program it will have the proper extension.
Dec 18, 2017 this article will show you how to use the android studio nine patch tool to create and use the nine patch image. How to make 9patch image downloaded from the network mautilus. Ninepatchbitmap bitmap, byte chunk, string srcname. Adding 9patch images to your android splash screen. Failure to do so may result in unpredictable results. Android 9 patch image tutorial this tutorial describes what android 9 patch images are, how to make them, and how to use 9 patch images in android applications. Custom drawn buttons can look distorted and pixelated when their borders are stretched in. Autostretch trim edge transparency trim stretch region.
In creating android chat bubbles, ninepatch image plays a crucial role. The bitmap drawable has some nice features for tiling and stretching images. Different between ninepatch image vs regular bitmap image in. Getting started in android development part 10 nine. The view is where you have placed the image as the background. These are referred to as ninepatch graphics, since they have nine distinct regions. When designing a user interface ui you may want to change the default view backgrounds to give an app its own look.