This looks reasonably nice

app/src/main/java/io/heckel/ntfy/db/Repository.kt

@@ -353,7 +353,7 @@ class Repository(private val sharedPrefs: SharedPreferences, private val databas
     }
 
     fun addLastShareTopic(topic: String) {
-        val topics = (getLastShareTopics() + topic).takeLast(LAST_TOPICS_COUNT)
+        val topics = (getLastShareTopics().filterNot { it == topic } + topic).takeLast(LAST_TOPICS_COUNT)
         sharedPrefs.edit()
             .putString(SHARED_PREFS_LAST_TOPICS, topics.joinToString(separator = "\n"))
             .apply()
@@ -437,7 +437,7 @@ class Repository(private val sharedPrefs: SharedPreferences, private val databas
         const val SHARED_PREFS_UNIFIED_PUSH_BASE_URL = "UnifiedPushBaseURL"
         const val SHARED_PREFS_LAST_TOPICS = "LastTopics"
 
-        private const val LAST_TOPICS_COUNT = 5
+        private const val LAST_TOPICS_COUNT = 3
 
         const val MUTED_UNTIL_SHOW_ALL = 0L
         const val MUTED_UNTIL_FOREVER = 1L

app/src/main/java/io/heckel/ntfy/ui/MainAdapter.kt

@@ -13,7 +13,6 @@ import io.heckel.ntfy.R
 import io.heckel.ntfy.db.ConnectionState
 import io.heckel.ntfy.db.Repository
 import io.heckel.ntfy.db.Subscription
-import io.heckel.ntfy.util.isDarkThemeOn
 import io.heckel.ntfy.util.topicShortUrl
 import java.text.DateFormat
 import java.util.*

app/src/main/java/io/heckel/ntfy/ui/ShareActivity.kt

@@ -7,15 +7,15 @@ import android.os.Bundle
 import android.os.Parcelable
 import android.text.Editable
 import android.text.TextWatcher
-import android.view.Menu
-import android.view.MenuItem
-import android.view.View
+import android.view.*
 import android.widget.*
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.textfield.TextInputLayout
 import io.heckel.ntfy.R
 import io.heckel.ntfy.app.Application
+import io.heckel.ntfy.db.Subscription
 import io.heckel.ntfy.msg.ApiService
 import io.heckel.ntfy.util.*
 import kotlinx.coroutines.Dispatchers
@@ -31,6 +31,9 @@ class ShareActivity : AppCompatActivity() {
     // Lazy-loaded things from Repository
     private lateinit var baseUrls: List<String>
 
+    // Context-dependent things
+    private lateinit var appBaseUrl: String
+
     // UI elements
     private lateinit var menu: Menu
     private lateinit var sendItem: MenuItem
@@ -43,6 +46,7 @@ class ShareActivity : AppCompatActivity() {
     private lateinit var baseUrlLayout: TextInputLayout
     private lateinit var baseUrlText: AutoCompleteTextView
     private lateinit var useAnotherServerCheckbox: CheckBox
+    private lateinit var lastTopicsList: RecyclerView
     private lateinit var progress: ProgressBar
     private lateinit var errorText: TextView
     private lateinit var errorImage: ImageView
@@ -60,6 +64,9 @@ class ShareActivity : AppCompatActivity() {
         // Show 'Back' button
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
 
+        // Context-dependent things
+        appBaseUrl = getString(R.string.app_base_url)
+
         // UI elements
         contentText = findViewById(R.id.share_content_text)
         contentImage = findViewById(R.id.share_content_image)
@@ -73,6 +80,7 @@ class ShareActivity : AppCompatActivity() {
         baseUrlText = findViewById(R.id.share_base_url_text)
         //baseUrlText.background = topicText.background
         useAnotherServerCheckbox = findViewById(R.id.share_use_another_server_checkbox)
+        lastTopicsList = findViewById(R.id.share_last_topics)
         progress = findViewById(R.id.share_progress)
         progress.visibility = View.GONE
         errorText = findViewById(R.id.share_error_text)
@@ -93,6 +101,7 @@ class ShareActivity : AppCompatActivity() {
         }
         contentText.addTextChangedListener(textWatcher)
         topicText.addTextChangedListener(textWatcher)
+        baseUrlText.addTextChangedListener(textWatcher)
 
         // Add behavior to "use another" checkbox
         useAnotherServerCheckbox.setOnCheckedChangeListener { _, isChecked ->
@@ -100,9 +109,25 @@ class ShareActivity : AppCompatActivity() {
             validateInput()
         }
 
+        // Populate "last topics"
+        val reversedLastTopics = repository.getLastShareTopics().reversed()
+        lastTopicsList.adapter = TopicAdapter(reversedLastTopics) { topicUrl ->
+            try {
+                val (baseUrl, topic) = splitTopicUrl(topicUrl)
+                topicText.text = topic
+                if (baseUrl == appBaseUrl) {
+                    useAnotherServerCheckbox.isChecked = false
+                } else {
+                    useAnotherServerCheckbox.isChecked = true
+                    baseUrlText.setText(baseUrl)
+                }
+            } catch (e: Exception) {
+                Log.w(TAG, "Invalid topicUrl $topicUrl", e)
+            }
+        }
+
         // Add baseUrl auto-complete behavior
         lifecycleScope.launch(Dispatchers.IO) {
-            val appBaseUrl = getString(R.string.app_base_url)
             baseUrls = repository.getSubscriptions()
                 .groupBy { it.baseUrl }
                 .map { it.key }
@@ -111,14 +136,20 @@ class ShareActivity : AppCompatActivity() {
             val activity = this@ShareActivity
             activity.runOnUiThread {
                 initBaseUrlDropdown(baseUrls, baseUrlText, baseUrlLayout)
-                useAnotherServerCheckbox.isChecked = baseUrls.count() == 1
+                useAnotherServerCheckbox.isChecked = if (reversedLastTopics.isNotEmpty()) {
+                    try {
+                        val (baseUrl, _) = splitTopicUrl(reversedLastTopics.first())
+                        baseUrl != appBaseUrl
+                    } catch (_: Exception) {
+                        false
+                    }
+                } else {
+                    baseUrls.count() == 1
+                }
+                baseUrlLayout.visibility = if (useAnotherServerCheckbox.isChecked) View.VISIBLE else View.GONE
             }
         }
 
-        // Populate "last topics"
-        val lastTopics = repository.getLastShareTopics()
-        Log.d(TAG, "last topics: $lastTopics")
-
         // Incoming intent
         val intent = intent ?: return
         if (intent.action != Intent.ACTION_SEND) return
@@ -284,6 +315,24 @@ class ShareActivity : AppCompatActivity() {
         }
     }
 
+    class TopicAdapter(private val topicUrls: List<String>, val onClick: (String) -> Unit) : RecyclerView.Adapter<TopicAdapter.ViewHolder>() {
+        override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): ViewHolder {
+            val view = LayoutInflater.from(viewGroup.context).inflate(R.layout.fragment_share_item, viewGroup, false)
+            return ViewHolder(view)
+        }
+
+        override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {
+            viewHolder.topicName.text = shortUrl(topicUrls[position])
+            viewHolder.view.setOnClickListener { onClick(topicUrls[position]) }
+        }
+
+        override fun getItemCount() = topicUrls.size
+
+        class ViewHolder(val view: View) : RecyclerView.ViewHolder(view) {
+            val topicName: TextView = view.findViewById(R.id.share_item_text)
+        }
+    }
+
     companion object {
         const val TAG = "NtfyShareActivity"
     }

app/src/main/java/io/heckel/ntfy/util/Util.kt

@@ -44,6 +44,11 @@ fun shortUrl(url: String) = url
     .replace("http://", "")
     .replace("https://", "")
 
+fun splitTopicUrl(topicUrl: String): Pair<String, String> {
+    if (topicUrl.lastIndexOf("/") == -1) throw Exception("Invalid argument $topicUrl")
+    return Pair(topicUrl.substringBeforeLast("/"), topicUrl.substringAfterLast("/"))
+}
+
 fun validTopic(topic: String): Boolean {
     return "[-_A-Za-z0-9]{1,64}".toRegex().matches(topic) // Must match server side!
 }

app/src/main/res/layout/activity_share.xml

@@ -1,9 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
+<ScrollView
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="match_parent">
+    <androidx.constraintlayout.widget.ConstraintLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
             android:orientation="horizontal" android:paddingStart="15dp" android:paddingEnd="15dp" android:paddingTop="10dp" android:paddingBottom="10dp">
 
         <ProgressBar
@@ -21,9 +24,9 @@
                 android:paddingBottom="2dp"
                 android:text="@string/share_content_title"
                 android:textAlignment="viewStart"
-            android:textAppearance="@style/TextAppearance.AppCompat.Large"
+                android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                 app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toTopOf="parent" android:paddingStart="2dp"/>
+                app:layout_constraintTop_toTopOf="parent"/>
         <com.google.android.material.imageview.ShapeableImageView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content" app:srcCompat="@drawable/ic_cancel_gray_24dp"
@@ -75,24 +78,24 @@
                 android:paddingBottom="3dp"
                 android:text="@string/share_topic_title"
                 android:textAlignment="viewStart"
-            android:textAppearance="@style/TextAppearance.AppCompat.Large"
+                android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                 app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/share_content_file_box" android:layout_marginTop="15dp" android:paddingStart="2dp"/>
+                app:layout_constraintTop_toBottomOf="@id/share_content_file_box" android:layout_marginTop="15dp"/>
         <com.google.android.material.textfield.TextInputEditText
                 android:id="@+id/share_topic_text"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content" android:hint="@string/add_dialog_topic_name_hint"
                 android:importantForAutofill="no"
-            android:maxLines="1" android:inputType="text" android:maxLength="64"
+                android:maxLines="1" android:inputType="text|textNoSuggestions" android:maxLength="64"
                 app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/share_topic_title"/>
+                app:layout_constraintTop_toBottomOf="@id/share_topic_title" android:layout_marginStart="-3dp"/>
         <CheckBox
                 android:text="@string/add_dialog_use_another_server"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content" android:id="@+id/share_use_another_server_checkbox"
-            android:layout_marginStart="-3dp" app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/share_topic_text"/>
+                app:layout_constraintTop_toBottomOf="@id/share_topic_text" android:paddingTop="-5dp" android:layout_marginTop="-5dp" android:layout_marginStart="-5dp"/>
         <com.google.android.material.textfield.TextInputLayout
                 style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.Dense.ExposedDropdownMenu"
                 android:id="@+id/share_base_url_layout"
@@ -100,29 +103,26 @@
                 android:layout_height="wrap_content"
                 android:layout_margin="0dp"
                 android:padding="0dp"
-            android:visibility="gone"
+                android:visibility="visible"
                 app:endIconMode="custom"
                 app:hintEnabled="false"
-            app:boxBackgroundColor="@null" app:layout_constraintStart_toStartOf="parent"
+                app:boxBackgroundColor="@null"
                 app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/share_use_another_server_checkbox">
+                app:layout_constraintTop_toBottomOf="@id/share_use_another_server_checkbox" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="-5dp">
             <AutoCompleteTextView
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:id="@+id/share_base_url_text"
                     android:hint="@string/app_base_url"
                     android:maxLines="1"
-                android:layout_marginTop="0dp"
+                    android:layout_marginTop="-5dp"
                     android:layout_marginBottom="0dp"
-                android:inputType="textNoSuggestions"
+                    android:inputType="textUri|textNoSuggestions"
                     android:paddingStart="0dp"
                     android:paddingEnd="0dp"
                     android:paddingTop="5dp"
                     android:paddingBottom="5dp"
-                android:layout_marginStart="4dp"
-                android:layout_marginEnd="4dp"
-                android:textAppearance="?android:attr/textAppearanceMedium"
-        />
+                    android:layout_marginStart="4dp" android:textAppearance="@style/TextAppearance.AppCompat.Medium"/>
         </com.google.android.material.textfield.TextInputLayout>
         <TextView
                 android:id="@+id/share_last_title"
@@ -132,13 +132,19 @@
                 android:paddingBottom="3dp"
                 android:text="@string/share_previous_topics"
                 android:textAlignment="viewStart"
-            android:textAppearance="@style/TextAppearance.AppCompat.Large"
-            android:paddingStart="2dp" app:layout_constraintTop_toBottomOf="@id/share_base_url_layout" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="15dp"/>
-    <LinearLayout
-            android:orientation="vertical"
-            android:layout_width="0dp"
-            android:layout_height="wrap_content" android:id="@+id/share_last_layout" app:layout_constraintTop_toBottomOf="@id/share_last_title" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="5dp">
-    </LinearLayout>
+                android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+                app:layout_constraintTop_toBottomOf="@id/share_base_url_layout" app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="15dp"/>
+        <androidx.recyclerview.widget.RecyclerView
+                android:layout_width="match_parent"
+                android:layout_height="0dp"
+                android:id="@+id/share_last_topics"
+                app:layout_constraintTop_toBottomOf="@id/share_last_title"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintEnd_toEndOf="parent"
+                android:clickable="true"
+                android:focusable="true"
+                android:background="?android:attr/selectableItemBackground"
+                app:layoutManager="LinearLayoutManager"/>
         <TextView
                 android:text="Unable to resolve host example.com"
                 android:layout_width="0dp"
@@ -148,7 +154,7 @@
                 android:paddingEnd="4dp"
                 android:textAppearance="@style/DangerText"
                 app:layout_constraintStart_toEndOf="@id/share_error_image"
-            android:layout_marginTop="10dp" app:layout_constraintTop_toBottomOf="@id/share_last_title"/>
+                android:layout_marginTop="10dp" app:layout_constraintTop_toBottomOf="@id/share_last_topics"/>
         <ImageView
                 android:layout_width="20dp"
                 android:layout_height="20dp" app:srcCompat="@drawable/ic_error_red_24dp"
@@ -157,3 +163,4 @@
                 app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/share_error_text" android:layout_marginTop="2dp"/>
 
     </androidx.constraintlayout.widget.ConstraintLayout>
+</ScrollView>

app/src/main/res/layout/fragment_share_item.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                                                   xmlns:app="http://schemas.android.com/apk/res-auto"
+                                                   android:layout_width="match_parent"
+                                                   android:layout_height="wrap_content"
+                                                   android:background="?android:attr/selectableItemBackground"
+                                                   android:orientation="horizontal" android:clickable="true"
+                                                   android:focusable="true"
+>
+    <ImageView
+            android:layout_width="20dp"
+            android:layout_height="20dp" app:srcCompat="@drawable/ic_sms_gray_24dp"
+            android:id="@+id/share_item_image"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintBottom_toBottomOf="@+id/share_item_text"
+            app:layout_constraintTop_toTopOf="@+id/share_item_text" android:layout_marginStart="2dp"/>
+    <TextView
+            android:text="ntfy.sh/example"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content" android:id="@+id/share_item_text"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintStart_toEndOf="@+id/share_item_image"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textColor="?android:attr/textColorPrimary" android:layout_marginTop="7dp"
+            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="7dp" android:layout_marginStart="4dp"/>
+</androidx.constraintlayout.widget.ConstraintLayout>
+