How to Filter Books Finished in the Last Week Using Java

Discover how to filter books based on their completion date in your Android project. This guide provides a step-by-step solution to ensure your list displays books finished in the last week.
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Filtering Books Finished in the Last Week in Your Android Project

When developing an Android application that allows users to track their completed books, it's common to implement features that filter data based on various criteria. One such requirement is to filter the list of finished books to show only those that were completed within the last week.

In this guide, we will explore a common issue you might encounter when trying to filter these dates in Java and provide a solution to ensure your app behaves as expected.

The Problem

You have implemented a filtering method in your Android application, but when you run it, the expected results do not appear. Despite your logic checking if the completion dates fall within the last week, your list remains empty.

Sample Code

Here's a look at the initial method you wrote for filtering the last week’s finished books:

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

Understanding the Issue

Upon exploring the debug logs, you noticed that the endDateMillis values do not seem to meet the conditions you have written in the if statement. For example, if endDateMillis returns a value such as 1684159940, it should represent a date within the expected range but does not. This discrepancy arises because the endDate value is off by a multiple of 1000.

Clarification of Timestamp Value

The Solution

To resolve this inconsistency, modify your code to account for the milliseconds by multiplying the endDateMillis value by 1000. Here's what your updated line of code should look like:

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

Now, your conditional check will work correctly, enabling the filtering of books completed in the last week.

Updated Filtering Method

Here’s the revised filtering method in its entirety:

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

Conclusion

By correcting the timestamp values from seconds to milliseconds, you can effectively filter your list of finished books to include only those completed in the last week. It’s important to maintain consistency in how you handle time values in programming.

If you encounter similar issues in the future, remember to check for discrepancies in units and formats. Happy coding!