Give focus to input A if none is selected.

app/src/main/java/me/zobrist/tichucounter/MainActivity.kt

@@ -145,48 +145,59 @@ class MainActivity : AppCompatActivity() {
         }
 
         button0.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('0')
         }
 
         button1.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('1')
         }
 
         button2.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('2')
         }
 
         button3.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('3')
         }
 
         button4.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('4')
         }
 
         button5.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('5')
         }
 
         button6.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('6')
         }
 
         button7.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('7')
         }
 
         button8.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('8')
         }
 
         button9.setOnClickListener {
+            giveFocusToAIfNone()
             appendToFocusedInput('9')
         }
 
         buttonInv.setOnClickListener {
             val tempInt: Int
 
+            giveFocusToAIfNone()
 
             if(inputTeamA.isFocused ){
                 if (inputTeamA.text.isNotEmpty()){
@@ -209,15 +220,17 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-        buttonBack.setOnClickListener{
-            if(inputTeamA.isFocused ){
-                if(inputTeamA.text.isNotEmpty()){
+        buttonBack.setOnClickListener {
+            giveFocusToAIfNone()
+
+            if (inputTeamA.isFocused) {
+                if (inputTeamA.text.isNotEmpty()) {
                     val string = inputTeamA.text.toString()
-                    inputTeamA.setText(string.substring(0, string.length -1))
+                    inputTeamA.setText(string.substring(0, string.length - 1))
                 }
 
-            }else if(inputTeamB.isFocused) {
-                if(inputTeamB.text.isNotEmpty()) {
+            } else if (inputTeamB.isFocused) {
+                if (inputTeamB.text.isNotEmpty()) {
                     val string = inputTeamB.text.toString()
                     inputTeamB.setText(string.substring(0, string.length - 1))
                 }
@@ -225,6 +238,7 @@ class MainActivity : AppCompatActivity() {
         }
 
         submit.setOnClickListener {
+            giveFocusToAIfNone()
 
             if (inputTeamA.text.isNotEmpty() && inputTeamB.text.isNotEmpty()) {
 
@@ -260,7 +274,7 @@ class MainActivity : AppCompatActivity() {
                 clearAll()
                 true
             }
-            R.id.action_undo  -> {
+            R.id.action_undo -> {
                 undoLastRound()
                 true
             }
@@ -272,7 +286,13 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    private fun undoLastRound(){
+    private fun giveFocusToAIfNone() {
+        if (!inputTeamA.isFocused && !inputTeamB.isFocused) {
+            inputTeamA.requestFocus()
+        }
+    }
+
+    private fun undoLastRound() {
 
         history.revertLastRound()
         updateView()