[Android][Autofill] Hide required fields notice when no fields required

Prior this change, at the bottom of the dialog there was always a label
with text "* Field is required". Now this text is only shown when there
is at least one required field.

For now it only affects the AddressEditor usage opened from Autofill
Settings.

Bug: 1149568
Change-Id: I581c7ca6e89f1aaacb3e698dd3fb21981f2aa087
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536438
Commit-Queue: Elizabeth Popova <lizapopova@google.com>
Reviewed-by: Christoph Schwering <schwering@google.com>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Matthias Körber <koerber@google.com>
Cr-Commit-Position: refs/heads/master@{#829649}

chrome/android/java/res/layout/editable_option_editor_footer.xml

@@ -8,6 +8,7 @@
         android:orientation="vertical" >
 
     <TextView
+        android:id="@+id/required_fields_notice"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginTop="8dp"

chrome/android/java/src/org/chromium/chrome/browser/autofill/prefeditor/EditorDialog.java

@@ -356,6 +356,18 @@ public class EditorDialog
         cancelButton.setOnClickListener(this);
     }
 
+    private void prepareFooter() {
+        TextView requiredFieldsNotice = mLayout.findViewById(R.id.required_fields_notice);
+        int requiredFieldsNoticeVisibility = View.GONE;
+        for (int i = 0; i < mFieldViews.size(); i++) {
+            if (mFieldViews.get(i).isRequired()) {
+                requiredFieldsNoticeVisibility = View.VISIBLE;
+                break;
+            }
+        }
+        requiredFieldsNotice.setVisibility(requiredFieldsNoticeVisibility);
+    }
+
     /**
      * Create the visual representation of the EditorModel.
      *
@@ -453,6 +465,7 @@ public class EditorDialog
 
                     // The fields may have changed.
                     prepareEditor();
+                    prepareFooter();
                     if (sObserverForTest != null) sObserverForTest.onEditorReadyToEdit();
                 }
             };
@@ -530,6 +543,7 @@ public class EditorDialog
 
         prepareToolbar();
         prepareEditor();
+        prepareFooter();
         prepareButtons();
         show();
     }

chrome/android/java/src/org/chromium/chrome/browser/autofill/prefeditor/EditorDropdownField.java

@@ -177,6 +177,11 @@ class EditorDropdownField implements EditorFieldView {
         return mFieldModel.isValid();
     }
 
+    @Override
+    public boolean isRequired() {
+        return mFieldModel.isRequired();
+    }
+
     @Override
     public void updateDisplayedError(boolean showError) {
         View view = mDropdown.getSelectedView();

chrome/android/java/src/org/chromium/chrome/browser/autofill/prefeditor/EditorFieldView.java

@@ -16,6 +16,9 @@ interface EditorFieldView {
     /** @return True if this field is valid. */
     boolean isValid();
 
+    /** @return True if this field is required. */
+    boolean isRequired();
+
     /** Scrolls to and focuses the field to bring user's attention to it. */
     void scrollToAndFocus();
 

chrome/android/java/src/org/chromium/chrome/browser/autofill/prefeditor/EditorTextField.java

@@ -256,6 +256,11 @@ public class EditorTextField extends FrameLayout implements EditorFieldView, Vie
         return mEditorFieldModel.isValid();
     }
 
+    @Override
+    public boolean isRequired() {
+        return mEditorFieldModel.isRequired();
+    }
+
     @Override
     public void updateDisplayedError(boolean showError) {
         mInputLayout.setError(showError ? mEditorFieldModel.getErrorMessage() : null);