feat: answer type-in-answer with enter key

Author: BrayanDSO

AnkiDroid/src/main/assets/scripts/ankidroid.js

@@ -30,6 +30,15 @@ globalThis.ankidroid.onTypeAnswerInput = function (event) {
     window.location.href = `ankidroid://typeinput/${encodedValue}`;
 };
 
+/**
+ * @param {KeyboardEvent} event - the onkeydown event of the type answer <input>
+ */
+globalThis.ankidroid.onTypeAnswerKeyDown = function (event) {
+    if (event.key === "Enter") {
+        window.location.href = `ankidroid://show-answer`;
+    }
+};
+
 document.addEventListener("focusin", event => {
     window.location.href = `ankidroid://focusin`;
 });

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/ReviewerFragment.kt

@@ -720,6 +720,7 @@ class ReviewerFragment :
                         "focusin" -> webviewHasFocus = true
                         "focusout" -> webviewHasFocus = false
                         "typeinput" -> url.path?.substring(1)?.let { viewModel.typedAnswer = it }
+                        "show-answer" -> viewModel.onShowAnswer()
                     }
                     true
                 }

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/ReviewerViewModel.kt

@@ -577,7 +577,7 @@ class ReviewerViewModel(
         val repl =
             """
             <center>
-            <input type="text" id="typeans" oninput="ankidroid.onTypeAnswerInput(event);" 
+            <input type="text" id="typeans" oninput="ankidroid.onTypeAnswerInput(event);" onkeydown="ankidroid.onTypeAnswerKeyDown(event);" 
                style="font-family: '${typeAnswer.font}'; font-size: ${typeAnswer.fontSize}px;">
             </center>
             """.trimIndent()