Refactor OnLongClickListener interface to support multiple click-types

app/src/main/java/com/embers/simpleto_do/DoubleClickListener.kt

@@ -0,0 +1,21 @@
+package com.embers.simpleto_do
+
+import android.util.Log
+import android.view.View
+
+abstract class DoubleClickListener : View.OnClickListener {
+    private var lastClick: Long = 0
+
+    override fun onClick(v: View) {
+        val curClick = System.currentTimeMillis()
+        if (curClick - lastClick < DOUBLE_CLICK_TIME_DELTA)
+            onDoubleClick(v)
+        lastClick = curClick
+    }
+
+    abstract fun onDoubleClick(item: View)
+
+    companion object {
+        private const val DOUBLE_CLICK_TIME_DELTA: Long = 300 // Milliseconds
+    }
+}

app/src/main/java/com/embers/simpleto_do/MainActivity.kt

@@ -3,7 +3,6 @@ package com.embers.simpleto_do
 import android.os.Bundle
 import android.util.Log
 import android.view.KeyEvent
-import android.view.View
 import android.widget.Button
 import android.widget.EditText
 import androidx.appcompat.app.AppCompatActivity
@@ -68,8 +67,8 @@ class MainActivity : AppCompatActivity() {
         /**
          * Callback to remove a task at a given location in the list (on long click action)
          */
-        val onLongClickListener = object : TaskItemAdapter.OnLongClickListener {
+        val clickListener = object : TaskItemAdapter.ClickListener {
-            override fun onItemLongClicked(position: Int) {
+            override fun onLongClick(position: Int) {
                 taskList.removeAt(position)
                 adapter.notifyItemRemoved(position)
                 saveData()
@@ -79,7 +78,7 @@ class MainActivity : AppCompatActivity() {
         // Setup RecyclerView
         editText = findViewById<EditText>(R.id.editTodoText)
         recyclerView = findViewById<RecyclerView>(R.id.recyclerView)
-        adapter = TaskItemAdapter(taskList, onLongClickListener)
+        adapter = TaskItemAdapter(taskList, clickListener)
         recyclerView.adapter = adapter
         recyclerView.layoutManager = LinearLayoutManager(this)
         button = findViewById(R.id.button)
@@ -87,13 +86,13 @@ class MainActivity : AppCompatActivity() {
         refreshButton()
 
         // Disable add task button when text is not inside EditText
-        findViewById<EditText>(R.id.editTodoText).setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
+        findViewById<EditText>(R.id.editTodoText).setOnKeyListener { _, _, event ->
             // Read only event after the action has been processed in the textbox
             if (event.action == KeyEvent.ACTION_UP)
                 refreshButton()
 
             false
-        })
+        }
 
         findViewById<Button>(R.id.button).setOnClickListener {
             // Check that the task name has text in it

app/src/main/java/com/embers/simpleto_do/TaskItemAdapter.kt

@@ -8,12 +8,14 @@ import androidx.recyclerview.widget.RecyclerView
 
 class TaskItemAdapter(
     private val taskList: List<String>,
-    private val longClickListener: OnLongClickListener
+    private val clickListener: ClickListener
 ) :
     RecyclerView.Adapter<TaskItemAdapter.ViewHolder>() {
 
-    interface OnLongClickListener {
+    interface ClickListener {
-        fun onItemLongClicked(position: Int)
+        fun onSingleClick(position: Int) {}
+        fun onDoubleClick(position: Int) {}
+        fun onLongClick(position: Int) {}
     }
 
     inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
@@ -21,9 +23,15 @@ class TaskItemAdapter(
 
         init {
             itemView.setOnLongClickListener {
-                longClickListener.onItemLongClicked(bindingAdapterPosition)
+                clickListener.onLongClick(bindingAdapterPosition)
                 true
             }
+
+            itemView.setOnClickListener(object : DoubleClickListener() {
+                override fun onDoubleClick(item: View) {
+                    clickListener.onDoubleClick(bindingAdapterPosition)
+                }
+            })
         }
     }
 

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

@@ -22,10 +22,10 @@
         android:layout_margin="10dp"
         android:importantForAutofill="no"
         android:inputType="textShortMessage"
-        tools:labelFor="@string/textbox_labelfor"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toStartOf="@+id/button"
-        app:layout_constraintStart_toStartOf="parent" />
+        app:layout_constraintStart_toStartOf="parent"
+        tools:labelFor="@string/textbox_labelfor" />
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"