Sample app deeplinking

app-sample/build.gradle

@@ -18,6 +18,12 @@ android {
         resConfig 'en'
 
         setProperty("archivesBaseName", "markwon-$versionName")
+
+        final def scheme = 'markwon'
+        buildConfigField 'String', 'DEEPLINK_SCHEME', "\"$scheme\""
+        manifestPlaceholders += [
+                'deeplink_scheme': scheme
+        ]
     }
 
     dexOptions {

app-sample/src/main/AndroidManifest.xml

@@ -16,10 +16,20 @@
         tools:ignore="AllowBackup,GoogleAppIndexingWarning">
 
         <activity android:name=".sample.MainActivity">
+            <!-- launcher intent -->
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="${deeplink_scheme}" />
+            </intent-filter>
         </activity>
 
         <activity

app-sample/src/main/java/io/noties/markwon/app/sample/Deeplink.kt

@@ -0,0 +1,73 @@
+package io.noties.markwon.app.sample
+
+import android.net.Uri
+import io.noties.debug.Debug
+import io.noties.markwon.app.BuildConfig
+import io.noties.markwon.sample.annotations.MarkwonArtifact
+
+sealed class Deeplink {
+    data class Sample(val id: String) : Deeplink()
+    data class Search(val search: SampleSearch) : Deeplink()
+
+    companion object {
+        fun parse(data: Uri?): Deeplink? {
+            Debug.i(data)
+            @Suppress("NAME_SHADOWING")
+            val data = data ?: return null
+            if (BuildConfig.DEEPLINK_SCHEME != data.scheme) return null
+            return when (data.host) {
+                // markwon://sample/20202827
+                "sample" -> parseSample(data.lastPathSegment)
+                // markwon://search?a=ext-latex&q=text
+                "search" -> parseSearch(data.query)
+                else -> null
+            }
+        }
+
+        private fun parseSample(id: String?): Sample? {
+            if (id == null) return null
+            return Sample(id)
+        }
+
+        private fun parseSearch(query: String?): Search? {
+            Debug.i("query: '$query'")
+
+            val params = query
+                    ?.split("&")
+                    ?.map {
+                        val (k, v) = it.split("=")
+                        Pair(k, v)
+                    }
+                    ?.toMap()
+                    ?: return null
+
+            val artifact = params["a"]
+            val tag = params["t"]
+            val search = params["q"]
+
+            Debug.i("artifact: '$artifact', tag: '$tag', search: '$search'")
+
+            val sampleSearch: SampleSearch? = if (artifact != null) {
+                val encodedArtifact = MarkwonArtifact.values()
+                        .firstOrNull { it.artifactName() == artifact }
+                if (encodedArtifact != null) {
+                    SampleSearch.Artifact(search, encodedArtifact)
+                } else {
+                    null
+                }
+            } else if (tag != null) {
+                SampleSearch.Tag(search, tag)
+            } else if (search != null) {
+                SampleSearch.All(search)
+            } else {
+                null
+            }
+
+            if (sampleSearch == null) {
+                return null
+            }
+
+            return Search(sampleSearch)
+        }
+    }
+}

app-sample/src/main/java/io/noties/markwon/app/sample/MainActivity.kt

@@ -2,7 +2,10 @@ package io.noties.markwon.app.sample
 
 import android.os.Bundle
 import android.view.Window
+import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
+import io.noties.markwon.app.App
+import io.noties.markwon.app.sample.ui.SampleFragment
 import io.noties.markwon.app.sample.ui.SampleListFragment
 
 class MainActivity : FragmentActivity() {
@@ -11,9 +14,27 @@ class MainActivity : FragmentActivity() {
         super.onCreate(savedInstanceState)
 
         if (supportFragmentManager.findFragmentById(Window.ID_ANDROID_CONTENT) == null) {
+
             supportFragmentManager.beginTransaction()
                     .add(Window.ID_ANDROID_CONTENT, SampleListFragment.init())
                     .commitNowAllowingStateLoss()
+
+            // process deeplink if we are not restored
+            val deeplink = Deeplink.parse(intent.data)
+            val deepLinkFragment: Fragment? = if (deeplink != null) {
+                when (deeplink) {
+                    is Deeplink.Sample -> App.sampleManager.sample(deeplink.id)
+                            ?.let { SampleFragment.init(it) }
+                    is Deeplink.Search -> SampleListFragment.init(deeplink.search)
+                }
+            } else null
+
+            if (deepLinkFragment != null) {
+                supportFragmentManager.beginTransaction()
+                        .replace(Window.ID_ANDROID_CONTENT, deepLinkFragment)
+                        .addToBackStack(null)
+                        .commit()
+            }
         }
     }
 }

app-sample/src/main/java/io/noties/markwon/app/sample/SampleManager.kt

@@ -15,6 +15,10 @@ class SampleManager(
         SampleUtils.readSamples(context)
     }
 
+    fun sample(id: String): Sample? {
+        return samples.firstOrNull { id == it.id }
+    }
+
     fun samples(search: SampleSearch?, callback: (List<Sample>) -> Unit): Cancellable {
 
         var action: ((List<Sample>) -> Unit)? = callback

app-sample/src/main/java/io/noties/markwon/app/sample/ui/SampleListFragment.kt

@@ -98,11 +98,20 @@ class SampleListFragment : Fragment() {
 //        }
 
         val state: State? = arguments?.getParcelable(STATE)
-        Debug.i(state)
+        val initialSearch = arguments?.getString(ARG_SEARCH)
+
+        // clear it anyway
+        arguments?.remove(ARG_SEARCH)
+
+        Debug.i(state, initialSearch)
 
         pendingRecyclerScrollPosition = state?.recyclerScrollPosition
-        if (state?.search != null) {
+
-            searchBar.search(state.search)
+        val search = listOf(state?.search, initialSearch)
+                .firstOrNull { it != null }
+
+        if (search != null) {
+            searchBar.search(search)
         } else {
             fetch()
         }
@@ -144,35 +153,38 @@ class SampleListFragment : Fragment() {
         val appBarTitle: TextView = appBar.findViewById(R.id.app_bar_title)
         val appBarIconReadme: ImageView = appBar.findViewById(R.id.app_bar_icon_readme)
 
-        val isInitialScreen = type is Type.All
+        val isInitialScreen = fragmentManager?.backStackEntryCount == 0
 
         appBarIcon.hidden = isInitialScreen
         appBarIconReadme.hidden = !isInitialScreen
 
         val type = this.type
-        if (type is Type.All) {
+
+        val (text, background) = when (type) {
+            is Type.Artifact -> Pair(type.artifact.displayName, R.drawable.bg_artifact)
+            is Type.Tag -> Pair(type.tag.tagDisplayName, R.drawable.bg_tag)
+            is Type.All -> Pair(resources.getString(R.string.app_name), 0)
+        }
+
+        appBarTitle.text = text
+
+        if (background != 0) {
+            appBarTitle.setBackgroundResource(background)
+        }
+
+        if (isInitialScreen) {
             appBarIconReadme.setOnClickListener {
                 context?.let {
                     val intent = ReadMeActivity.makeIntent(it)
                     it.startActivity(intent)
                 }
             }
-            return
+        } else {
-        }
-
             appBarIcon.setImageResource(R.drawable.ic_arrow_back_white_24dp)
             appBarIcon.setOnClickListener {
                 requireActivity().onBackPressed()
             }
-
-        val (text, background) = when (type) {
-            is Type.Artifact -> Pair(type.artifact.displayName, R.drawable.bg_artifact)
-            is Type.Tag -> Pair(type.tag.tagDisplayName, R.drawable.bg_tag)
-            else -> error("Unexpected type: $type")
         }
-
-        appBarTitle.text = text
-        appBarTitle.setBackgroundResource(background)
     }
 
     private fun bindSamples(samples: List<Sample>) {
@@ -192,7 +204,6 @@ class SampleListFragment : Fragment() {
         val scrollPosition = pendingRecyclerScrollPosition
 
         Debug.i(scrollPosition)
-        Debug.trace()
 
         if (scrollPosition != null) {
             pendingRecyclerScrollPosition = null
@@ -242,7 +253,6 @@ class SampleListFragment : Fragment() {
         }
 
         Debug.i(sampleSearch)
-        Debug.trace()
 
         // clear current
         cancellable?.let {
@@ -259,6 +269,7 @@ class SampleListFragment : Fragment() {
     companion object {
         private const val ARG_ARTIFACT = "arg.Artifact"
         private const val ARG_TAG = "arg.Tag"
+        private const val ARG_SEARCH = "arg.Search"
         private const val STATE = "key.State"
 
         fun init(): SampleListFragment {
@@ -283,6 +294,23 @@ class SampleListFragment : Fragment() {
             return fragment
         }
 
+        fun init(search: SampleSearch): SampleListFragment {
+            val fragment = SampleListFragment()
+            fragment.arguments = Bundle().apply {
+
+                when (search) {
+                    is SampleSearch.Artifact -> putString(ARG_ARTIFACT, search.artifact.name)
+                    is SampleSearch.Tag -> putString(ARG_TAG, search.tag)
+                }
+
+                val query = search.text
+                if (query != null) {
+                    putString(ARG_SEARCH, query)
+                }
+            }
+            return fragment
+        }
+
         fun markwon(context: Context): Markwon {
             return Markwon.builder(context)
                     .usePlugin(MovementMethodPlugin.none())