https://blog.substitute.tech/en/tags/contentresolver/ Recent content in Contentresolver on Haoxiqiang's Blog Hugo en Fri, 31 Mar 2017 11:19:26 +0000 https://blog.substitute.tech/en/posts/android%E7%9A%84mediastore/ Fri, 31 Mar 2017 11:19:26 +0000 https://blog.substitute.tech/en/posts/android%E7%9A%84mediastore/ <p>When building a photo album feature similar to WeChat, I needed to read photos and videos with multi-folder switching — and it had to be faster than WeChat. After some research, the <code>MediaStore</code> approach proved most suitable. Since I hadn&rsquo;t used it much before, this post serves as a record.</p> <h2 id="the-group-by-hack-in-contentresolver">The GROUP BY Hack in ContentResolver</h2> <p><code>ContentResolver.query()</code> does not expose a <code>groupBy</code> parameter (unlike <code>SQLiteQueryBuilder.query()</code>), but you can achieve a similar effect by embedding <code>GROUP BY</code> directly into the <code>selection</code> argument.</p>