fix weird error on failed pin

app/src/main/java/sh/sar/basedbank/LockActivity.kt

@@ -203,15 +203,15 @@ class LockActivity : AppCompatActivity() {
         if (remaining <= 0) return false
         val secs = ((remaining + 999L) / 1000L).toInt()
         val msg = getString(R.string.unlock_locked_out, secs)
-        binding.tvLockPinDots.text = msg
+        binding.tvPinHint.text = msg
-        binding.root.postDelayed({ updateDots() }, remaining)
+        binding.root.postDelayed({ binding.tvPinHint.text = ""; updateDots() }, remaining)
         return true
     }
 
     private fun showFailure() {
         val msg = failureMessage()
-        binding.tvLockPinDots.text = msg
+        binding.tvPinHint.text = msg
-        binding.root.postDelayed({ updateDots() }, 1200)
+        binding.root.postDelayed({ binding.tvPinHint.text = ""; updateDots() }, 1200)
     }
 
     private fun failureMessage(): String {

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

@@ -52,7 +52,16 @@
             android:textSize="26sp"
             android:letterSpacing="0.3"
             android:textColor="?attr/colorPrimary"
-            android:layout_marginBottom="24dp" />
+            android:layout_marginBottom="4dp" />
+
+        <TextView
+            android:id="@+id/tvPinHint"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textAppearance="?attr/textAppearanceBodySmall"
+            android:textColor="?attr/colorOnSurfaceVariant"
+            android:gravity="center"
+            android:layout_marginBottom="20dp" />
 
         <LinearLayout
             android:id="@+id/lockNumpadContainer"