Newer versions of the Layoutlib will use only the {@link NinePatchChunk} as the default. If you are using IntelliJ IDEA, you can simply copy/rename the file to end with. From a terminal, launch the draw9patch application from your SDK /tools directory. Basically, 9-patch uses png transparency to do an advanced form of.

Fill area guides are optional and provide a way define the area for stuff like your text label. Fill determines how much room there is within your image to place text, or an icon, or other things. Patch isn't just for buttons, it works for background images as well. The above button & label example is exaggerated simply to explain the idea of fill - the label isn't completely accurate. To be honest, I haven't experienced how Android does multi-line labels since a button label is usually a single row of text.

With this example, the LEFT guide isn't used but we're still required to have a guide. The background image don't scale vertically; it just scales horizontally (based on the TOP guide). Looking at the fill guides, the RIGHT and BOTTOM guides extend beyond where they meet the image's curved edges.

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This allows me to place my round buttons close to the edges of the background for a tight, fitted look. Patch is super easy, once you get it.

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It's not a perfect way to do scaling, but the fill-area and multi-line scale-guides does offer more flexibility than traditional 9-slice and scale9. Give it a try and you'll figure it out quickly. For more useful tips. Thanks so much – by far the simplest guide I have seen – helped me understand what wa wrong with my 9. These round images are beautiful.

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Any way to have some ready made? The best guide on 9 patch I’ve seen. Helpful for a noob like me. I am trying to use 9-patch images in ios but maybe it’s not recognising these as 9 patch even i’ve named these images like abc. If i am using these images ‘a black border’ is coming. That is 1 px guide line as u said in ur tutorial. Or am I missing something, Please help! Patch is a Google designed, Android-specific file format. It does not run natively on iOS (though there may be libraries out there to support them).

I’d like to echo everyone else’s sentiments: great guide! I think one part of the guide is slightly misleading.

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To me, that implies that if you put the 9patch in a layout taller than the button’s native height, and tell it to match_parent, it won’t grow at all (the “height remains the same”) and it will stay at its native height as though you had set it to wrap_content. Android won’t recognize a 9-scale without something on the left side. That’s why I did a full bar, so it stretches naturally, which in this case is not at all. So I tried this out, and it does indeed stretch vertically (“naturally” just like images normally stretch).

How is that “not at all”? I assume you mean it won’t stretch if you tell it that the height should wrap_content. Is that the only way to make a button not stretch vertically?

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There’s nothing you can do inside of the 9patch so it’ll ensure it won’t stretch even if it’s in a layout that tries to stretch it? Normally your ImageView container should limit the stretching. Otherwise, make your image’s canvas two pixels taller (but centered) and add two single-pixel scale marks on the left, each aligned with the new empty space. Make sure the new row is truly empty – you don’t want to stretch anti-aliased portions of your image. I thought I had padding understood but couldn’t find anywhere on the net that confirmed apart from your excellent post.

Is there a way to fill the display with edge pixels without scaling the image in the center.

For instance, if I have a 20×20 while circle in the center of a 100×100 red background, is it possible to stretch the red background only leaving the 20×20 circle intact? Sure – add two stretch lines on either side of the circle, but not within the circle.

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The lines need to be the same length on each side so they stretch evenly on each side of the circle. Finally, if the outside area is a single color, you can just do a 1-pixel stretch line which will essentially stretch the color of the corresponding pixel. Best guide on the internet about NinePatch images. Thanks for sharing man. This was hugely helpful. I do have one question–if I’d like to create a stretchable icon with a non-stretchable graphic in the center, could I assign two individual stretch points across the top and two down the left to create a stretchable padding inside the icon? Hi, im confuse the guides lines must be solid black or transparent?

And when you save the image, you save in for example ths one is 48×48 but i save in 50×50? Thanks for the helpful input.

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But I am confused in your last scale & scale example. The text says “Left scale is not used, so height remains the same”, but the image beside shows a full left scale (from left top to left bottom). Android won’t recognize a 9-scale without something on the left side. That’s why I did a full bar, so it stretches naturally, which in this case is not at all. Well done broi really appreciate those who are making life easy for developers. I hav written a code to click an image and set it on an imageview. Nw how do i stretch this image? Others (we will leave them nameless but they are well known) don’t do as good job explaining 9-patch as you have done here.

So the stretching that happens in the scaling areas, how is that handled? Is there smoothing or other upsampling methods applied? Looks like you trust a gradient in those areas, but it might be good to cover that, if it is known. For the most part it’s smooth. If you’re trying something very subtle, with little difference in a short area you may see banding. I’m used to seeing banding so I’ll often try gradients over and over until I get something smooth.

Thanks for this very helpful article! Wanted to take a minute to tell you great job with your article! Exactly what I was looking for, clear explanation & examples! First of all thank you for nice tutorial. My lot of confusions get clear but still I am stuck in one thing.

I am going to create a 9 path image for my button. But, I could not understand what should be its size for xhdpi, hdpi, ldpi and mdpi. In tutorial you said image size should by 48×48 and after creating 1 pixel black line line its size become 50×50. Please tell me what should be original image size for xhdpi, hdpi, ldpi and mdpi? Do I first create an image for xhdpi, hdpi, ldpi and mdpi and then separately create 9 path image? Mdpi is the same as dp in size, so 48dp is 48 pixels on an mdpi device. So if you have a 48×48 image, it will need to be 72×72 for hdpi and 96×96 for xhdpi.

Adding a 9-scale border to each will make the files 50×50, 74×74, and 98×98. Yeah, it’s best that way because Photoshop tends to add hard to see anti-aliasing which can break 9-scale markings. You’ll usually need to redraw by hand new guidelines, as well as run an eraser around the edge of the graphic, just to be sure it’s clean. I removed the reference to it since I couldn’t find another example. Thanks for letting me know! Trying to shrink the size of a 9patch (e. By specify height in xml that’s smaller than the image’s height) will typically result in nasty visual artefacts.

Some tools available for creating/editing.

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The info is very helpful to gain more information on 9-patch for Android. It would be better if you could provide a simple example PSD just a suggestion. I want to tile certain regions in a png. Not the whole png. Patched areas only needs to be tiled. I have a link back to your article here since I really like. Keep on the good work! How to use 9 patch image in a android? Where 9 patch tools in Eclipse? When i use 9 patch image it gave error No resource found?

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Plz give proper guideliness. However, there’s something I don’t understand: if I don’t use the LEFT guide (because I don’t want the image to be stretched vertically), I get this error message: “No marked region found along edge. Found along left edge”. I think I must be missing something, but I can’t figure out what’s wrong. I checked out my actual working assets and turns out I did use a left guide, even though I’m not scaling vertically.

I’ve updated the graphic and post. Thanks so much for your article. Question: Normally Android recommends that you provide multiple versions of each image to account for different screen sizes/resolutions. Is that still required when you use a 9 Patch image?

Create Resizable Bitmaps (9-Patch files)

If you only need a single 9 Patch image for all resolutions, which baseline resolution do you pick? There’s about a 30% size difference between mdpi & hdpi so I always do 2x screen images; I do mdpi & hdpi and ignore ldpi. By my understanding, mdpi is the standard baseline for dp scaling: layouts match mdpi and scale from there to hdpi. One other thing that I don’t think is documented on the official page, is that you can actually have more than one “stretchable” region on each side. Png files in the SDK that use this. So imagine you have an icon in the middle of a button that you don’t want to stretch, but you do want the space either side of the icon to stretch Your top black line would be in 2 parts, either side of the icon.