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Commit b1646ff

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Rohit Singh
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- Jsoup and Coil libs added in build.gradle
- linkpreview package created for loose coupling
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11 files changed

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‎README.md

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# LinkParser
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# Android Link Preview
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An Android Project with demo application, to fetch meta-data from url, like facebook, youtube and other websites.
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##Usage
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Request metadata for url, it will execute in background thread, you will get an instance from LinkPreview
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‎app/build.gradle

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kotlinOptions {
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jvmTarget = '1.8'
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}
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buildFeatures {
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// for view binding:
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viewBinding = true
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}
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}
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dependencies {
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testImplementation 'junit:junit:4.13.2'
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androidTestImplementation 'androidx.test.ext:junit:1.1.3'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
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//getting meta tag from links
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implementation 'org.jsoup:jsoup:1.15.2'
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//coil image loading libs
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implementation("io.coil-kt:coil:1.4.0")
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/ImageType.kt

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package com.linkpreview.none.linkpreview
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/**
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* Different types of articles that can be handled
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*/
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enum class ImageType { DEFAULT, YOUTUBE, NONE }

‎app/src/main/java/com/linkpreview/none/linkpreview/PreviewData.kt

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package com.linkpreview.none.linkpreview
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import androidx.annotation.Keep
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@Keep
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data class PreviewData(val siteName : String,val title: String, val imageUrl: String, val baseUrl: String) {
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fun isEmpty(): Boolean = title.isEmpty() && baseUrl.isEmpty()
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fun isNotEmpty(): Boolean = !isEmpty()
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/extension/LinkExtension.kt

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package com.linkpreview.none.linkpreview.extension
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import android.content.Context
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import android.content.Intent
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import android.net.Uri
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import android.util.Log
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import android.view.View
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import com.linkpreview.none.linkpreview.PreviewData
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import com.linkpreview.none.linkpreview.listener.LinkListener
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import com.linkpreview.none.linkpreview.view.LinkPreview
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import org.jsoup.Jsoup
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import org.jsoup.nodes.Document
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import org.jsoup.nodes.Element
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import java.net.URI
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@Suppress("BlockingMethodInNonBlockingContext")
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suspend fun LinkPreview.loadPreviewData(
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link: String,
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key: Int,
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listener: LinkListener?
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) = withContext(Dispatchers.Default) {
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try {
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val result = try {
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val connection = Jsoup.connect(link).referrer("http://www.google.com")
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val doc: Document = connection.get()
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val imageElements = doc.select("meta[property=og:image]")
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//Get description from document object.
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val dataLink : Element? = doc.select("a").first()
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val siteName: String =getHostName(link).toString()
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if (imageElements.size > 0) {
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var it = 0
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var chosen: String? = ""
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while ((chosen == null || chosen.isEmpty()) && it < imageElements.size) {
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chosen = imageElements[it].attr("content")
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it += 1
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}
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PreviewData(siteName,doc.title(), chosen ?: "", link)
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} else {
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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}
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} catch (e: IndexOutOfBoundsException) {
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e.printStackTrace()
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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} catch (e: Exception) {
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e.printStackTrace()
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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}
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launch(Dispatchers.Main) {
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try {
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if (result.isNotEmpty()) {
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setPreviewData(result)
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listener?.onSuccess(result)
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} else {
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Log.d("Article Request", "Image url is empty")
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visibility = View.GONE
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listener?.onError()
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}
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} catch (e: Exception) {
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e.printStackTrace()
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listener?.onError()
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} catch (e: IllegalArgumentException) {
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e.printStackTrace()
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listener?.onError()
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}
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}
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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fun Context.launchUrlWithCustomTab(uri: Uri) {
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try{
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val browserIntent = Intent(Intent.ACTION_VIEW,uri)
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startActivity(browserIntent)
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}catch (e : Exception){
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e.printStackTrace()
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}
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}
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@Suppress("BlockingMethodInNonBlockingContext")
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suspend fun loadPreviewData(
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link: String,
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listener: LinkListener?
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) = withContext(Dispatchers.Default) {
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try {
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val result = try {
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val connection = Jsoup.connect(link).referrer("http://www.google.com")
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val doc: Document = connection.get()
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val imageElements = doc.select("meta[property=og:image]")
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//Get description from document object.
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val dataLink : Element? = doc.select("a").first()
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val siteName: String = getHostName(link).toString()
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if (imageElements.size > 0) {
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var it = 0
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var chosen: String? = ""
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while ((chosen == null || chosen.isEmpty()) && it < imageElements.size) {
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chosen = imageElements[it].attr("content")
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it += 1
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}
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PreviewData(siteName,doc.title(), chosen ?: "", link)
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} else {
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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}
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} catch (e: IndexOutOfBoundsException) {
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e.printStackTrace()
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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} catch (e: Exception) {
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e.printStackTrace()
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launch(Dispatchers.Main) { listener?.onError() }
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PreviewData("","", "", "")
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}
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launch(Dispatchers.Main) {
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try {
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if (result.isNotEmpty()) {
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listener?.onSuccess(result)
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} else {
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listener?.onError()
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}
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} catch (e: Exception) {
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e.printStackTrace()
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listener?.onError()
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} catch (e: IllegalArgumentException) {
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e.printStackTrace()
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listener?.onError()
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}
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}
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} catch (e: Exception) {
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listener?.onError()
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e.printStackTrace()
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}
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}
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/*
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* get hostName */
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fun getHostName(baseUrl: String): CharSequence {
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val uri = URI(baseUrl)
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val hostname: String = uri.host
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return if (hostname.startsWith("www.")) hostname.substring(4) else hostname
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/extension/UrlExtension.kt

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package com.linkpreview.none.linkpreview.extension
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/**
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* Checks whether a string is a url by using Regex
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*/
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fun String.isUrl(): Boolean = this.matches(Regex(REGEX_URL))
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/**
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* Parses the link from the full string
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*/
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fun String.parseUrl(): String = REGEX_URL.toRegex().find(this)?.value ?: ""
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/**
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* Regex pattern that matches to standard urls
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*/
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private const val REGEX_URL = "https?://(www\\.)?[-a-zA-Z0-9@:%._+~#=]{2,256}\\.[a-z]{2,6}\\b([-a-zA-Z0-9@:%_+.~#?&/=]*)"

‎app/src/main/java/com/linkpreview/none/linkpreview/helper/LinkPreviewNetwork.kt

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package com.linkpreview.none.linkpreview.helper
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import android.content.Context
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.withContext
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import org.jsoup.Jsoup
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import org.jsoup.nodes.Document
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object LinkPreviewNetwork {
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/**
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*
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*/
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suspend fun loadImage(context: Context, link: String): String? {
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return try {
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withContext(Dispatchers.Default) {
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val key = link.hashCode()
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try {
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val connection = Jsoup.connect(link)
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val doc: Document = connection.get()
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val imageElements = doc.select("meta[property=og:image]")
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if (imageElements.size > 0) {
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var it = 0
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var chosen: String? = ""
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while ((chosen == null || chosen.isEmpty()) && it < imageElements.size) {
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chosen = imageElements[it].attr("content")
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it += 1
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}
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chosen
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} else {
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""
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}
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} catch (e: IndexOutOfBoundsException) {
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e.printStackTrace()
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""
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} catch (e: Exception) {
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e.printStackTrace()
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""
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}
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}
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} catch (e: Exception) {
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e.printStackTrace()
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""
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}
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}
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/listener/CardListener.kt

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package com.linkpreview.none.linkpreview.listener
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import com.linkpreview.none.linkpreview.PreviewData
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interface CardListener {
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/**
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* Called when there was an error in loading the image from url, recommended to hide the view
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*/
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fun onError()
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/**
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* Called when image from url is loaded successfully
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*
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* @param card to url image
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*/
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fun onSuccess(card: PreviewData)
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/listener/LinkClickListener.kt

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package com.linkpreview.none.linkpreview.listener
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import android.view.View
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import com.linkpreview.none.linkpreview.view.LinkPreview
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interface LinkClickListener {
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/**
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* Listener to provide custom preview click functionality
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*
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* @param view of type [LinkPreview] that was pressed, possibly null
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* @param url of the website that was parsed that should be opened
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*/
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fun onLinkClicked(view: View?, url: String)
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}

‎app/src/main/java/com/linkpreview/none/linkpreview/listener/LinkListener.kt

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package com.linkpreview.none.linkpreview.listener
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import com.linkpreview.none.linkpreview.PreviewData
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interface LinkListener {
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/**
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* Called when there was an error in loading the image from url, recommended to hide the view
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*/
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fun onError()
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/**
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* Called when image from url is loaded successfully
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*
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* @param link to url image
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*/
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fun onSuccess(link: PreviewData)
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}

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