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class="mp mq fj mr bh ms"><div class="mg mh mi"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*vqdr6i8jC4gLHmNeoEfbwA.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, 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3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh ln mt c" width="700" height="350" loading="eager" role="presentation"/></picture></div></div></figure><h1 id="4599" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">1. What is Jetpack Compose, and why was it introduced?</h1><p id="3816" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk">Jetpack Compose is a modern UI toolkit for building Android apps. It simplifies UI development by allowing you to create UIs declaratively, similar to React or Flutter. Instead of modifying existing UI elements, you describe how the UI should look and react to changes in the app’s state.</p><p id="b0c7" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk"><strong class="nu gv">Why introduced?</strong></p><ul class=""><li id="ba90" class="ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op ov ow ox bk">To replace the traditional XML-based UI framework, which could be verbose and error-prone.</li><li id="ebc0" class="ns nt gu nu b nv oy nx ny nz oz ob oc od pa of og oh pb oj ok ol pc on oo op ov ow ox bk">To offer a more flexible, concise, and intuitive way to design UIs.</li><li id="e9a4" class="ns nt gu nu b nv oy nx ny nz oz ob oc od pa of og oh pb oj ok ol pc on oo op ov ow ox bk">To make it easier to write, maintain, and test UI code.</li></ul><h1 id="e5cc" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">2. What is the difference between Column and Row?</h1><ul class=""><li id="b70c" class="ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op ov ow ox bk"><strong class="nu gv">Column</strong>: Arranges its children vertically, one below the other.</li><li id="9062" class="ns nt gu nu b nv oy nx ny nz oz ob oc od pa of og oh pb oj ok ol pc on oo op ov ow ox bk"><strong class="nu gv">Row</strong>: Arranges its children horizontally, side by side.</li></ul><p id="e429" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">For example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="6431" class="pm mv gu pj b bg pn po l pp pq">Column {<br/> Text("Item 1")<br/> Text("Item 2")<br/>}<br/>// Output: <br/>// Item 1<br/>// Item 2<br/><br/>Row {<br/> Text("Item 1")<br/> Text("Item 2")<br/>}<br/>// Output: Item 1 Item 2</span></pre><h1 id="3434" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">3. What is a Modifier in Jetpack Compose?</h1><p id="98d0" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk">A <strong class="nu gv">Modifier</strong> is used to modify the appearance, layout, or behavior of a composable. It’s like a chainable tool to apply styling, padding, size, alignment, click listeners, etc.</p><p id="0cb3" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="4ca2" class="pm mv gu pj b bg pn po l pp pq">Text(<br/> text = "Hello!",<br/> modifier = Modifier.padding(16.dp).background(Color.Blue).clickable { }<br/>)</span></pre><p id="cdfb" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Here, <code class="cx pr ps pt pj b">padding</code>, <code class="cx pr ps pt pj b">background</code>, and <code class="cx pr ps pt pj b">clickable</code> are applied using a <strong class="nu gv">Modifier</strong>.</p><h1 id="3c7b" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">4. What is the purpose of Box in Compose?</h1><p id="8fc3" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk">A <strong class="nu gv">Box</strong> is a layout in Compose that allows you to stack its children on top of each other. It’s useful when you want to overlay elements or control their alignment.</p><p id="33fe" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="b0ab" class="pm mv gu pj b bg pn po l pp pq">Box {<br/> Text("Bottom Text")<br/> Text("Top Text", modifier = Modifier.align(Alignment.Center))<br/>}</span></pre><h1 id="368f" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">5. Explain the concept of recomposition in Jetpack Compose?</h1><p id="16b8" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk">Recomposition is the process of automatically updating only the parts of the UI that have changed when the state variables of a Composable function are modified. Jetpack Compose tracks the dependencies between Composable functions and their state variables. When a state variable changes, only the affected Composable functions are recomposed, ensuring efficient UI updates.</p><p id="3e44" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="9898" class="pm mv gu pj b bg pn po l pp pq">var count by remember { mutableStateOf(0) }<br/>Text("Count: $count")<br/>Button(onClick = { count++ }) { Text("Increase") }</span></pre><p id="c750" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">When you click the button, <code class="cx pr ps pt pj b">count</code> changes, and the <code class="cx pr ps pt pj b">Text</code> composable showing the count is recomposed.</p><h1 id="3d39" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">6. How does Jetpack Compose handle state?</h1><p id="ed03" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk">Compose uses a concept called <strong class="nu gv">State</strong> to manage and remember data during recompositions. A state variable is typically declared using <code class="cx pr ps pt pj b">remember</code> or <code class="cx pr ps pt pj b">mutableStateOf</code>.</p><p id="51ef" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="1f60" class="pm mv gu pj b bg pn po l pp pq">var name by remember { mutableStateOf("John") }<br/>Text("Hello, $name!")<br/>Button(onClick = { name = "Doe" }) { Text("Change Name") }</span></pre><p id="4860" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">When <code class="cx pr ps pt pj b">name</code> changes, the <code class="cx pr ps pt pj b">Text</code> composable updates automatically.</p><h1 id="28b5" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">7. Explain the difference between <code class="cx pr ps pt pj b">remember</code> and <code class="cx pr ps pt pj b">rememberSaveable</code>.</h1><ul class=""><li id="e41c" class="ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op ov ow ox bk"><code class="cx pr ps pt pj b"><strong class="nu gv">remember</strong></code>: Stores a value in memory. It works only as long as the composable is in memory. If the app is rotated or restarted, the value is lost.</li><li id="c10b" class="ns nt gu nu b nv oy nx ny nz oz ob oc od pa of og oh pb oj ok ol pc on oo op ov ow ox bk"><code class="cx pr ps pt pj b"><strong class="nu gv">rememberSaveable</strong></code>: Similar to <code class="cx pr ps pt pj b">remember</code> but saves the state across configuration changes (like screen rotation).</li></ul><p id="7f7c" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="42ac" class="pm mv gu pj b bg pn po l pp pq">val count = remember { mutableStateOf(0) } // Reset on rotation<br/>val savedCount = rememberSaveable { mutableStateOf(0) } // Persists on rotation</span></pre><h1 id="8d40" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">8. What are LaunchedEffect and SideEffect?</h1><ul class=""><li id="2dad" class="ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op ov ow ox bk"><strong class="nu gv">LaunchedEffect</strong>: Runs a coroutine in the scope of a composable. Used for tasks like fetching data or observing flows. It cancels and restarts when the key changes.</li></ul><p id="f375" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="74b6" class="pm mv gu pj b bg pn po l pp pq">LaunchedEffect(Unit) {<br/> println("This runs when the composable enters composition.")<br/>}</span></pre><ul class=""><li id="f8b4" class="ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op ov ow ox bk"><strong class="nu gv">SideEffect</strong>: Ensures code runs only after the composition is complete. Useful for one-time side effects like logging.</li></ul><p id="27b6" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="33e5" class="pm mv gu pj b bg pn po l pp pq">SideEffect {<br/> println("Executed after composition!")<br/>}</span></pre><h1 id="c686" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">9. What is rememberCoroutineScope, and when should you use it?</h1><p id="9a19" class="pw-post-body-paragraph ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op gn bk"><code class="cx pr ps pt pj b"><strong class="nu gv">rememberCoroutineScope</strong></code> provides access to a coroutine scope tied to the lifecycle of the composable. You can use it to launch coroutines for tasks like animations or background processing.</p><p id="c7d1" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="56d7" class="pm mv gu pj b bg pn po l pp pq">val scope = rememberCoroutineScope()<br/>Button(onClick = { scope.launch { delay(1000); println("Task done!") } }) {<br/> Text("Start Task")<br/>}</span></pre><h1 id="f8a5" class="mu mv gu bf mw mx my mz na nb nc nd ne nf ng nh ni nj nk nl nm nn no np nq nr bk">10. What are Flow and StateFlow, and how are they used with Jetpack Compose?</h1><ul class=""><li id="c349" class="ns nt gu nu b nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on oo op ov ow ox bk"><strong class="nu gv">Flow</strong>: A cold stream that emits values asynchronously.</li><li id="2eb0" class="ns nt gu nu b nv oy nx ny nz oz ob oc od pa of og oh pb oj ok ol pc on oo op ov ow ox bk"><strong class="nu gv">StateFlow</strong>: A hot stream that holds a current state and emits updates.</li></ul><p id="05e9" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">In Compose, they are often used to observe and react to data changes.</p><p id="2d3f" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Example with <code class="cx pr ps pt pj b">collectAsState</code>:</p><pre class="pd pe pf pg ph pi pj pk bp pl bb bk"><span id="70b7" class="pm mv gu pj b bg pn po l pp pq">val state = myStateFlow.collectAsState()<br/>Text("Current value: ${state.value}")</span></pre><p id="8f0e" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Here, Compose reacts to changes in <code class="cx pr ps pt pj b">StateFlow</code> and updates the UI automatically.</p><p id="0330" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Thank you for reading. 🙌🙏✌.</p><p id="da02" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">Don’t forget to clap 👏 and follow me for more such useful articles about Android Development, Kotlin.</p><p id="5c07" class="pw-post-body-paragraph ns nt gu nu b nv oq nx ny nz or ob oc od os of og oh ot oj ok ol ou on oo op gn bk">If you need any help related to Android, Kotlin. 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class="pw-author-name bf si sj sk sl sm sn so od sp sq oh sr ss ol st su bk"><span class="gn sh">Written by <!-- -->Anand Gaur</span></h2></a><div class="py ab ia"><div class="l is"><span class="pw-follower-count bf b bg z du"><a class="af ag ah ai aj ak al am an ao ap aq ar il" rel="noopener follow" href="/@anandgaur22/followers?source=post_page---post_author_info--0d0795bd2bc8--------------------------------">500 Followers</a></span></div><div class="bf b bg z du ab sv"><span class="im l" aria-hidden="true"><span class="bf b bg z du">·</span></span><a class="af ag ah ai aj ak al am an ao ap aq ar il" rel="noopener follow" href="/@anandgaur22/following?source=post_page---post_author_info--0d0795bd2bc8--------------------------------">1 Following</a></div></div><div class="sw l"><p class="bf b bg z bk"><span class="gn">Android Developer | Kotlin | Jetpack Compose | Kotlin MultiPlatform | Tech Lead in TCS | Formerly at Samsung and Tech Mahindra | 7+ years of 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What are Flow and StateFlow, and how are they used with Jetpack Compose?","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_49":{"__typename":"Paragraph","id":"3dd4bf8b50d4_49","name":"c349","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Flow: A cold stream that emits values asynchronously.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":4,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_50":{"__typename":"Paragraph","id":"3dd4bf8b50d4_50","name":"2eb0","type":"ULI","href":null,"layout":null,"metadata":null,"text":"StateFlow: A hot stream that holds a current state and emits updates.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":0,"end":9,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_51":{"__typename":"Paragraph","id":"3dd4bf8b50d4_51","name":"05e9","type":"P","href":null,"layout":null,"metadata":null,"text":"In Compose, they are often used to observe and react to data changes.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_52":{"__typename":"Paragraph","id":"3dd4bf8b50d4_52","name":"2d3f","type":"P","href":null,"layout":null,"metadata":null,"text":"Example with collectAsState:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":13,"end":27,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_53":{"__typename":"Paragraph","id":"3dd4bf8b50d4_53","name":"70b7","type":"PRE","href":null,"layout":null,"metadata":null,"text":"val state = myStateFlow.collectAsState()\nText(\"Current value: ${state.value}\")","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_54":{"__typename":"Paragraph","id":"3dd4bf8b50d4_54","name":"8f0e","type":"P","href":null,"layout":null,"metadata":null,"text":"Here, Compose reacts to changes in StateFlow and updates the UI automatically.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":35,"end":44,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_55":{"__typename":"Paragraph","id":"3dd4bf8b50d4_55","name":"0330","type":"P","href":null,"layout":null,"metadata":null,"text":"Thank you for reading. 🙌🙏✌.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_56":{"__typename":"Paragraph","id":"3dd4bf8b50d4_56","name":"da02","type":"P","href":null,"layout":null,"metadata":null,"text":"Don’t forget to clap 👏 and follow me for more such useful articles about Android Development, Kotlin.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_57":{"__typename":"Paragraph","id":"3dd4bf8b50d4_57","name":"5c07","type":"P","href":null,"layout":null,"metadata":null,"text":"If you need any help related to Android, Kotlin. 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Be part of this thriving group to level up your career.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"STRONG","start":13,"end":41,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:3dd4bf8b50d4_62":{"__typename":"Paragraph","id":"3dd4bf8b50d4_62","name":"9d1c","type":"P","href":null,"layout":null,"metadata":null,"text":"WhatsApp Group 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