switch to letters keyboard if Space is pressed with symbols keyboard

app/src/main/kotlin/com/simplemobiletools/keyboard/services/SimpleKeyboardIME.kt

@@ -7,6 +7,7 @@ import android.view.KeyEvent
 import android.view.View
 import android.view.inputmethod.EditorInfo
 import android.view.inputmethod.EditorInfo.IME_ACTION_NONE
+import android.view.inputmethod.ExtractedTextRequest
 import com.simplemobiletools.commons.extensions.performHapticFeedback
 import com.simplemobiletools.keyboard.R
 import com.simplemobiletools.keyboard.helpers.MyKeyboard
@@ -28,6 +29,7 @@ class SimpleKeyboardIME : InputMethodService(), MyKeyboardView.OnKeyboardActionL
     private var keyboardMode = KEYBOARD_LETTERS
     private var inputTypeClass = InputType.TYPE_CLASS_TEXT
     private var enterKeyType = IME_ACTION_NONE
+    private var switchToLetters = false
 
     override fun onInitializeInterface() {
         super.onInitializeInterface()
@@ -144,11 +146,16 @@ class SimpleKeyboardIME : InputMethodService(), MyKeyboardView.OnKeyboardActionL
                     code = Character.toUpperCase(code)
                 }
 
-                inputConnection.commitText(code.toString(), 1)
+                // If the keyboard is set to symbols and the user presses space, we usually should switch back to the letters keyboard.
-                if (primaryCode == MyKeyboard.KEYCODE_SPACE && keyboardMode != KEYBOARD_LETTERS) {
+                // However, avoid doing that in cases when the EditText for example requires numbers as the input.
-                    keyboardMode = KEYBOARD_LETTERS
+                // We can detect that by the text not changing on pressing Space.
-                    keyboard = MyKeyboard(this, R.xml.keys_letters, enterKeyType)
+                if (keyboardMode != KEYBOARD_LETTERS && primaryCode == MyKeyboard.KEYCODE_SPACE) {
-                    keyboardView!!.setKeyboard(keyboard!!)
+                    val originalText = inputConnection.getExtractedText(ExtractedTextRequest(), 0).text
+                    inputConnection.commitText(code.toString(), 1)
+                    val newText = inputConnection.getExtractedText(ExtractedTextRequest(), 0).text
+                    switchToLetters = originalText != newText
+                } else {
+                    inputConnection.commitText(code.toString(), 1)
                 }
 
                 if (keyboard!!.shiftState == SHIFT_ON_ONE_CHAR && keyboardMode == KEYBOARD_LETTERS) {
@@ -163,6 +170,23 @@ class SimpleKeyboardIME : InputMethodService(), MyKeyboardView.OnKeyboardActionL
         }
     }
 
+    override fun onActionUp() {
+        if (switchToLetters) {
+            keyboardMode = KEYBOARD_LETTERS
+            keyboard = MyKeyboard(this, R.xml.keys_letters, enterKeyType)
+
+            val editorInfo = currentInputEditorInfo
+            if (editorInfo != null && editorInfo.inputType != InputType.TYPE_NULL && keyboard?.shiftState != SHIFT_ON_PERMANENT) {
+                if (currentInputConnection.getCursorCapsMode(editorInfo.inputType) != 0) {
+                    keyboard?.setShifted(SHIFT_ON_ONE_CHAR)
+                }
+            }
+
+            keyboardView!!.setKeyboard(keyboard!!)
+            switchToLetters = false
+        }
+    }
+
     override fun onText(text: CharSequence?) {}
 
     override fun swipeLeft() {}

app/src/main/kotlin/com/simplemobiletools/keyboard/views/MyKeyboardView.kt

@@ -98,6 +98,11 @@ class MyKeyboardView @JvmOverloads constructor(context: Context, attrs: Attribut
          * Called when the user quickly moves the finger from down to up.
          */
         fun swipeUp()
+
+        /**
+         * Called when the finger has been lifted after pressing a key
+         */
+        fun onActionUp()
     }
 
     private var mKeyboard: MyKeyboard? = null
@@ -1060,6 +1065,10 @@ class MyKeyboardView @JvmOverloads constructor(context: Context, attrs: Attribut
                     override fun onRelease(primaryCode: Int) {
                         onKeyboardActionListener!!.onRelease(primaryCode)
                     }
+
+                    override fun onActionUp() {
+                        onKeyboardActionListener!!.onActionUp()
+                    }
                 }
 
                 //mInputView.setSuggest(mSuggest);
@@ -1369,6 +1378,7 @@ class MyKeyboardView @JvmOverloads constructor(context: Context, attrs: Attribut
                 }
                 invalidateKey(keyIndex)
                 mRepeatKeyIndex = NOT_A_KEY
+                onKeyboardActionListener!!.onActionUp()
             }
             MotionEvent.ACTION_CANCEL -> {
                 removeMessages()