android中自定义view构造函数ContentItemView(Context context, AttributeSet paramAttributeSet)的用处

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"> <TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewTitle"
android:textColor="@color/black"
android:gravity="center" android:textSize="26dp"/> <TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewAuthor"
android:layout_gravity="left" android:textColor="@android:color/darker_gray" android:textSize="16dp"/> <ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:layout_gravity="center_horizontal"
android:scaleType="center"/> <TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewContent"
android:layout_gravity="center_horizontal" android:textColor="@color/black" android:textSize="20dp"/> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="2dp"
android:layout_gravity="center"
android:background="@color/black">
</LinearLayout> <TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textViewOtherInfo"
android:layout_gravity="left" android:clickable="true" android:textColor="@android:color/darker_gray"
android:textSize="16dp"/>
</LinearLayout>

public class ContentItemView extends LinearLayout { private TextView title;
private TextView author;
private TextView content;
private TextView otherInfo;
private ImageView contentImage; private ContentInfo info; public ContentItemView(Context context) {
super(context);
init(context);
} private void init(Context context) {
LinearLayout convertView =
(LinearLayout) LayoutInflater.from(context).inflate(R.layout.contentitem, null);
title = (TextView) convertView.findViewById(R.id.textViewTitle);
author = (TextView) convertView.findViewById(R.id.textViewAuthor);
content = (TextView) convertView.findViewById(R.id.textViewContent);
otherInfo = (TextView) convertView.findViewById(R.id.textViewOtherInfo);
contentImage = (ImageView) convertView.findViewById(R.id.imageView);
}
}

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white" android:paddingLeft="12dp" android:paddingTop="12dp"
android:paddingRight="12dp"> <ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView"> <view android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.HighFunStudio.shudu.ContentItemView" android:id="@+id/view"/>
</ScrollView>
</LinearLayout>

public ContentItemView(Context context, AttributeSet paramAttributeSet) {
super(context, paramAttributeSet);
init(context);
}