12/22/2023 0 Comments Java open bitmap in imageviewerLooks like Google is planning a support library for ImageDecoder, but there have been no updates about it for a long time already. EXIF orientation tags are handled automatically during decoding which is a real plus (which is not true for BitmapFactory).I’m not aware of the reason, but I guess that ImageDecoder is just not optimal for that. Also, cropping capability is not intended as a replacement codeRegion according to docs. But I was not able to achieve that due to the bug. In contrast to BitmapFactory, scaling and precise cropping can be done in one step.You can just use setTargetSize instead of the combination of inSampleSize, inDensity and inTargetDensity. There are a few things I found interesting which bring some benefits for the techniques discussed in the post: However, there is no backward compatibility for versions below. Google recommends using it over BitmapFactory and BitmapFactory.Options APIs. According to the documentation, it provides a modernized approach for decoding images. The new ImageDecoder class is introduced in Android 9. You can combine them to get an image with any size you want. This is where inDensity and inTargetDensity options come in. Obviously, such scaling is not accurate and doesn’t let you decode an image with precise size. For instance, inSampleSize = 4 returns an image that is 1/4 the width/height of the original. Looks like underlying image decoders behavior has been changed without the documentation being updated. However, during some testing, I figured out that other values are also supported on the latest android versions (or devices). Note: If you support zooming, you might want to show a full-size image without any scaling.Īccording to the documentation, inSampleSize value should be a power of 2 and any other value will be rounded down to the nearest power of 2. ImageViewer allows zooming/panning an image and potentially flicking between multiple images within a list of images. You are to use BitmapFactory API with a special option called inSampleSize which can be used to scale your bitmap on the decoding step. public class ImageViewer extends Component. Therefore, scaling is the first option to consider while optimizing your code. In this way, you provide the best quality possible with minimal resources required. In the perfect world, your bitmap has to be the same size as your preview canvas. On the other hand, if you happen to manipulate bitmaps manually, you are on your own to implement them. Luckily, you are safe if you use some image libraries like Picasso or Glide since they take care of all the optimizations out of the box. That’s the most fundamental rule you should always keep in mind. Press the SAVE IMAGE button to save the image.Never keep in memory more than you actually need On the device, press SELECT IMAGE FROM GALLERY to load and display an image.Press Shift + F10 to run the application. Replace the current code with the XML below. In the Project Explorer window, open the activity_main.xml file found in the app/src/main/res/layout directory. If a Deployment license file and developer key are required, refer to Obtaining a License.Īdding LEADTOOLS local references and setting a license are covered in more detail in the Add References and Set a License tutorial.
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