Скачать или смотреть How to Fix the Issue of ImageView Not Displaying in Your Android App

Struggling with an `ImageView` that won't show up in your Android application? Discover how to resolve this common issue with our step-by-step guide!
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This video is based on the question https://stackoverflow.com/q/62380925/ asked by the user 'zyngot' ( https://stackoverflow.com/u/13375840/ ) and on the answer https://stackoverflow.com/a/62381008/ provided by the user 'Hababa' ( https://stackoverflow.com/u/9629748/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting: Why Is My ImageView Not Showing Up in Android?

If you’ve recently started developing an Android application and run into the frustrating problem of an ImageView that simply doesn’t appear on your layout, you’re not alone. This is a common issue faced by new developers. In this post, we’ll explore the possible causes and offer a straightforward solution to ensure that your ImageView displays correctly in your app.

The Issue at Hand

When launching your app in the emulator, the ImageView you’ve added to your layout is nowhere to be found despite having your code set up. You follow the necessary steps to enable users to pick a picture from the gallery, but first, the ImageView must appear on the screen. The question is: why is it missing?

Understanding the Code

Here is a simplified look at how the ImageView is set up in the XML layout file:

[[See Video to Reveal this Text or Code Snippet]]

You have specified a drawable resource, @ drawable/galboy, using the tools:srcCompat attribute, which means it will only show up in the design editor for layout editing purposes. While this is visually helpful during the design phase, it does not display the image when you run the app.

The Solution: Correcting the ImageView Definition

To solve this problem, you'll need to change how you define the image source in your ImageView. Instead of using tools:srcCompat, replace it with app:srcCompat. Here’s the revised code snippet you should use:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

tools: Modifier: This attribute is used for design-time representation within the IDE. It does not influence runtime behavior, which is why your ImageView did not display.

app: Modifier: This attribute connects your drawable resource to the ImageView during application runtime, allowing it to render correctly when the app is launched.

Final Thoughts

When developing Android applications, small oversights such as this can lead to larger headaches. By understanding how different attributes function in your layout files, you can prevent these issues and enhance your development experience. Remember: visibility in the design editor does not always mean visibility on the device!

Now that you've successfully updated your layout, your ImageView should appear correctly when you run your app. Happy coding!