added backpress confirmation on app exit

app/src/main/java/com/doubtless/doubtless/screens/main/MainActivity.kt

@@ -1,14 +1,19 @@
 package com.doubtless.doubtless.screens.main
 
 import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
 import androidx.appcompat.app.AppCompatActivity
 import com.doubtless.doubtless.R
 import com.doubtless.doubtless.databinding.ActivityMainBinding
 import com.doubtless.doubtless.navigation.BackPressDispatcher
 import com.doubtless.doubtless.navigation.OnBackPressListener
+import com.google.android.material.snackbar.Snackbar
+
 
 class MainActivity : AppCompatActivity(), BackPressDispatcher {
 
+    private var doubleBackToExitPressedOnce: Boolean = false
     private lateinit var binding: ActivityMainBinding
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -52,8 +57,26 @@ class MainActivity : AppCompatActivity(), BackPressDispatcher {
             }
         }
 
-        if (!backPressConsumed)
-            super.onBackPressed()
+        if (!backPressConsumed) {
+            when {
+                doubleBackToExitPressedOnce -> super.onBackPressed()
+                else -> {
+                    this.doubleBackToExitPressedOnce = true
+                    Snackbar.make(
+                        binding.container,
+                        R.string.press_again_to_exit,
+                        Snackbar.LENGTH_SHORT
+                    ).show()
+                    Handler(Looper.getMainLooper()).postDelayed({
+                        doubleBackToExitPressedOnce = false
+                    }, BACKPRESS_DELAY)
+                }
+            }
+        }
+    }
+
+    companion object {
+        private const val BACKPRESS_DELAY = 2000L
     }
 
 }

app/src/main/java/com/doubtless/doubtless/utils/Extensions.kt

@@ -4,7 +4,9 @@ import android.animation.AnimatorInflater
 import android.content.Context
 import android.view.View
 import android.view.inputmethod.InputMethodManager
+import android.widget.Toast
 import androidx.annotation.AnimatorRes
+import androidx.annotation.StringRes
 
 fun View.addStateListAnimation(@AnimatorRes animation: Int) {
     this.stateListAnimator = AnimatorInflater.loadStateListAnimator(
@@ -16,4 +18,20 @@ fun View.addStateListAnimation(@AnimatorRes animation: Int) {
 fun View.hideSoftKeyboard() {
     val imm = this.context.getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
     imm?.hideSoftInputFromWindow(this.windowToken, 0)
+}
+
+fun Context.shortToast(@StringRes msg: Int) {
+    Toast.makeText(
+        this,
+        msg,
+        Toast.LENGTH_SHORT
+    ).show()
+}
+
+fun Context.longToast(@StringRes msg: Int) {
+    Toast.makeText(
+        this,
+        msg,
+        Toast.LENGTH_LONG
+    ).show()
 }

app/src/main/res/values/strings.xml

@@ -20,4 +20,5 @@
     <string name="text_choice_tag_3">Placements</string>
     <string name="select_at_max_tags">Please select at max 3 tags</string>
     <string name="sign_in_again">Please sign in again!</string>
+    <string name="press_again_to_exit">Press again to exit</string>
 </resources>