[Android] Fix onKeyPress so it provides the correct key when TextInput is at max length

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java

@@ -109,6 +109,7 @@ public class ReactEditText extends AppCompatEditText
   private @Nullable String mFontFamily = null;
   private int mFontWeight = ReactTypefaceUtils.UNSET;
   private int mFontStyle = ReactTypefaceUtils.UNSET;
+  private int lengthFilterValue = UNSET;
   private boolean mAutoFocus = false;
   private boolean mDidAttachToWindow = false;
 
@@ -465,6 +466,14 @@ public void setFontStyle(String fontStyleString) {
     }
   }
 
+  public int getLengthFilterValue() {
+    return lengthFilterValue;
+  }
+
+  public void setLengthFilterValue(int lengthFilterValue) {
+    this.lengthFilterValue = lengthFilterValue;
+  }
+
   public void maybeUpdateTypeface() {
     if (!mTypefaceDirty) {
       return;

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditTextInputConnectionWrapper.java

@@ -94,10 +94,17 @@ public boolean setComposingText(CharSequence text, int newCursorPosition) {
     boolean noPreviousSelection = previousSelectionStart == previousSelectionEnd;
     boolean cursorDidNotMove = currentSelectionStart == previousSelectionStart;
     boolean cursorMovedBackwardsOrAtBeginningOfInput =
-        (currentSelectionStart < previousSelectionStart) || currentSelectionStart <= 0;
-    if (cursorMovedBackwardsOrAtBeginningOfInput || (!noPreviousSelection && cursorDidNotMove)) {
+      (currentSelectionStart < previousSelectionStart) || currentSelectionStart <= 0;
+    int maxLength = mEditText.getLengthFilterValue();
+    int textLength = text.length();
+    boolean editTextAtMaxLength = mEditText.getText().length() == maxLength;
+    if (editTextAtMaxLength && textLength != 0) {
+      key = String.valueOf(text.charAt(textLength - 1));
+    }
+    else if (cursorMovedBackwardsOrAtBeginningOfInput || (!noPreviousSelection && cursorDidNotMove)) {
       key = BACKSPACE_KEY_VALUE;
-    } else {
+    }
+    else {
       key = String.valueOf(mEditText.getText().charAt(currentSelectionStart - 1));
     }
     dispatchKeyEventOrEnqueue(key);

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -649,6 +649,7 @@ public void setMaxLength(ReactEditText view, @Nullable Integer maxLength) {
         newFilters = new InputFilter[1];
         newFilters[0] = new InputFilter.LengthFilter(maxLength);
       }
+      view.setLengthFilterValue(maxLength);
     }
 
     view.setFilters(newFilters);