Merge "Fix the preview couldn't be scrolled up and down when showing the scroll bar."

res/layout/accessibility_text_reading_preview.xml

@@ -37,7 +37,7 @@
             android:text="@string/screen_zoom_preview_title"
             style="@style/AccessibilityTextReadingPreviewTitle" />
 
-        <androidx.viewpager.widget.ViewPager
+        <com.android.settings.accessibility.TextReadingPreviewPager
             android:id="@+id/preview_pager"
             android:layout_width="match_parent"
             android:layout_height="217dp"

res/layout/accessibility_text_reading_preview_mail_content.xml

@@ -15,7 +15,14 @@
     limitations under the License.
 -->
 
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="true"
+    android:importantForAccessibility="noHideDescendants">
+
+    <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical">
@@ -37,7 +44,7 @@
             android:paddingTop="11dp"
             android:textSize="12sp"
             android:text="@string/accessibility_text_reading_preview_mail_from"
-        android:textColor="?android:attr/textColorSecondary" />
+            android:textColor="?android:attr/textColorSecondary"/>
 
         <TextView
             android:id="@+id/content"
@@ -46,4 +53,5 @@
             android:textSize="13sp"
             android:text="@string/accessibility_text_reading_preview_mail_content"
             android:textColor="?android:attr/textColorPrimary"/>
-</LinearLayout>
+    </LinearLayout>
+</androidx.core.widget.NestedScrollView>

src/com/android/settings/accessibility/TextReadingPreviewPager.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.viewpager.widget.ViewPager;
+
+/**
+ * The view pager is used for displaying screen preview with different size configuration changes.
+ */
+public class TextReadingPreviewPager extends ViewPager {
+    public TextReadingPreviewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent ev) {
+        final ViewGroup parent = (ViewGroup) getParent();
+        if (parent != null) {
+            // Avoid conflicting with the nested scroll view.
+            parent.requestDisallowInterceptTouchEvent(true);
+        }
+
+        return super.onInterceptTouchEvent(ev);
+    }
+}