不需要使用Rome等庫即可用Kotlin解析RSS：借助Android內(nèi)置XmlPullParser和協(xié)程，可實(shí)現(xiàn)輕量、易維護(hù)的解析器；2. 步驟包括添加網(wǎng)絡(luò)權(quán)限、用HttpURLConnection或Retrofit獲取RSS流、用XmlPullParser解析為數(shù)據(jù)類列表，并在后臺線程運(yùn)行以避免阻塞UI；3. 注意處理CDATA、網(wǎng)絡(luò)異常、緩存結(jié)果并測試真實(shí)RSS源，結(jié)構(gòu)復(fù)雜時(shí)再考慮引入專用庫。

If you're building an Android app that needs to fetch and display content from RSS feeds using Kotlin, here’s a practical and lightweight approach — no need for heavy libraries unless you really want them.

? Why Not Use a Library Like Rome?

You can use libraries like Rome (Java), but for basic RSS parsing in Android, it often adds unnecessary complexity. With Kotlin’s clean syntax and Android’s built-in tools (XmlPullParser), you can write a parser that’s easy to understand, debug, and maintain.

1. Add Internet Permission

First, make sure your AndroidManifest.xml includes:

<uses-permission android:name="android.permission.INTERNET" />

2. Fetch RSS Feed with Retrofit or HTTPUrlConnection

You can use either:

Option A: Simple with HttpURLConnection (no extra dependency)

private fun fetchRss(urlString: String): InputStream? {
    val url = URL(urlString)
    val connection = url.openConnection() as HttpURLConnection
    connection.requestMethod = "GET"
    connection.connectTimeout = 5000
    connection.readTimeout = 5000

    return if (connection.responseCode == 200) {
        connection.inputStream
    } else {
        null
    }
}

Option B: Use Retrofit (recommended for multiple feeds/APIs)

Add Retrofit to build.gradle:

implementation "com.squareup.retrofit2:retrofit:2.9.0"

Then create a simple service:

interface RssService {
    @GET
    suspend fun getFeed(@Url url: String): Response<ResponseBody>
}

3. Parse RSS XML with XmlPullParser

Create a data class:

data class RssItem(
    val title: String = "",
    val link: String = "",
    val description: String = "",
    val pubDate: String = ""
)

Now parse:

fun parseRss(inputStream: InputStream): List<RssItem> {
    val parser = Xml.newPullParser()
    parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false)
    parser.setInput(inputStream, null)
    parser.nextTag()

    val items = mutableListOf<RssItem>()
    var title = ""
    var link = ""
    var description = ""
    var pubDate = ""

    while (parser.next() != XmlPullParser.END_TAG) {
        if (parser.eventType != XmlPullParser.START_TAG) continue
        when (parser.name) {
            "item" -> {
                // Reset for each item
                title = ""
                link = ""
                description = ""
                pubDate = ""
            }
            "title" -> title = parser.nextText()
            "link" -> link = parser.nextText()
            "description" -> description = parser.nextText()
            "pubDate" -> pubDate = parser.nextText()
            "guid", "category", "author" -> parser.nextText() // ignore or store if needed
            else -> skip(parser)
        }

        if (parser.name == "item" && parser.eventType == XmlPullParser.END_TAG) {
            items.add(RssItem(title, link, description, pubDate))
        }
    }
    return items
}

private fun skip(parser: XmlPullParser) {
    if (parser.eventType != XmlPullParser.START_TAG) {
        throw IllegalStateException()
    }
    var depth = 1
    while (depth != 0) {
        when (parser.next()) {
            XmlPullParser.END_TAG -> depth--
            XmlPullParser.START_TAG -> depth  
        }
    }
}

? This parser assumes basic RSS 2.0 structure (<rss><channel><item>...</item></channel></rss>). If your feed is nested differently, adjust the logic accordingly.

4. Run on Background Thread

Use CoroutineScope(Dispatchers.IO):

lifecycleScope.launch(Dispatchers.IO) {
    val inputStream = fetchRss("https://example.com/feed")
    if (inputStream != null) {
        val items = parseRss(inputStream)
        withContext(Dispatchers.Main) {
            // Update RecyclerView or UI
            adapter.submitList(items)
        }
    }
}

? Tips & Gotchas

• Some RSS feeds have CDATA in <description></description> — nextText() handles it fine.
• Always handle network errors (IOException, timeouts).
• Cache parsed results (Room or simple file) to avoid refetching.
• Test with real-world feeds like BBC, NPR, or Medium — they vary in structure.
• If feeds use Atom or malformed XML, consider a library like Simple XML or kotlinx.serialization with custom adapters.

Bottom line:
You don’t need a library to parse basic RSS in Kotlin. With XmlPullParser and coroutines, it’s clean, fast, and works reliably. Keep it simple until your needs grow — then consider Retrofit a dedicated parser.

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