Fix Wi-Fi Easy Connect QR code scanner problems

1. When camera area overlaps display cutout, it's onLayout size is 0/0.
   To fix it, use ConstraintLayout to specify width and height in layout file.

2. When scanned a QR code and there is an error, set camera area frame line
   back to unfocused color.

Bug: 124399763
Test: manual test
Change-Id: I7575efd0ccfb58d114acc3dcca6978d68b801f91

src/com/android/settings/wifi/qrcode/QrPreviewLayout.java

@@ -1,49 +0,0 @@
-/*
- * Copyright (C) 2018 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.wifi.qrcode;
-
-import android.content.Context;
-import android.util.AttributeSet;
-import android.widget.FrameLayout;
-
-/**
- * A customize square {@link FrameLayout}.
- * This is used for camera preview. Choose the smaller size of both dimensions as length and width.
- */
-public class QrPreviewLayout extends FrameLayout {
-    public QrPreviewLayout(Context context) {
-        super(context);
-    }
-
-    public QrPreviewLayout(Context context, AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    public QrPreviewLayout(Context context, AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-    }
-
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        // Choose the smaller size of the two dimensions.
-        if (MeasureSpec.getSize(widthMeasureSpec) > MeasureSpec.getSize(heightMeasureSpec)) {
-            super.onMeasure(heightMeasureSpec, heightMeasureSpec);
-        } else {
-            super.onMeasure(widthMeasureSpec, widthMeasureSpec);
-        }
-    }
-}