An android library demo that let you make you RecyclerView and GridView Adapter sectional

This Demo Application will help you to implement sectional adapter in you android applications.

To use Sectional Adapter in you project you need to some changes in your projects:

Include library to build.gradle app level:

implementation 'io.github.muhammadmuzammilsharif:sectionaladapter:1.0'

if your application not using jcenter repository then add
(only if in repositories session "jcenter()" is not included

allprojects {
		repositories {
  			maven { url "https://dl.bintray.com/muhammadmuzammilsharif/library" }
		...
		}
} 

for both Sectional Recycler View and GridView we need to have the same xml layout but different adapter.

<android.support.v7.widget.RecyclerView
    android:id="@+id/recycler"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</android.support.v7.widget.RecyclerView>

to implement Sectional adapter in RecyclerView you need to make that recyclerView Adapter and extend it with SectionalRecyclerViewAdapter like:

Java:
public class RecyclerViewAdapter extends SectionalRecyclerViewAdapter<K, T> {
    ... 
}
 
Kotlin:
class RecyclerViewAdapterKt : SectionalRecyclerViewAdapter<K, T> {
    ...
}

after extending the SectionalRecyclerViewAdapter it will force you to override methods given bellow:

1. onCreateHeaderViewHolder method with return type RecyclerView.ViewHolder for Section Header
2. onBindHeaderViewHolder method to set values to SectionHeader ViewHolder
3. onCreateSectionItemViewHolder method with return type RecyclerView.ViewHolder for Section items
4. onBindSectionItemViewHolder method to set values to Section item viewHolder

these methods are same as in normal RecyclerView Adapter for more detail see DummySectionRecyclerAdapter for java and DummySectionRecyclerAdapterKt for Kotlin.

to implement Sectional adapter in RecyclerView for SectionalGridView you need to make that recyclerView Adapter and extend it with SectionalGridAdapter like:

Java:
public class RecyclerViewAdapter extends SectionalGridAdapter<K, T> {
    ... 
}
 
Kotlin:
class RecyclerViewAdapterKt : SectionalGridAdapter<K, T> {
    ...
}

• "K" is Section Model it can also be predefine data types like (int, String, etc.)
• "T" is Section Items Model and it must be implements SectionalUniqueObject interface like:

Java: 
public class DummyData implements SectionalUniqueObject<K> {...}  

Kotlin:
class DummyData : SectionalUniqueObject<K> {...}

note: after implement SectionalUniqueObject interface it force you to override two methods

• getSection() of return type "K": this method return SectionModel to which this object belong
• getUniqueKey() of return type "Object" ("Any" in Kotlin): this method return unique key or id of sectionItem to avoid repetition of item in same section

after extending the SectionalGridAdapter it will force you to override methods given bellow:

1. getColumnCount: must return number of column show in each row at least 2
2. getHorizontalSpacing: must return spacing between two column in pixels
3. getVerticalSpacing: must return spacing between two rows in pixels
4. getSingleViewHeight must return each column height if you want a fixed height in pixels though out your grid view or return WRAP_CONTENT if you don't what to set it fixed.
5. getHeaderViewHolder must return RecyclerView.ViewHolder for Section Header
6. setDataToHeader method to set values to SectionHeader ViewHolder
7. getView must return View for each column with data given in method parameters

for more detail see DummySectionGridAdapter for java and DummySectionGridAdapterKt for Kotlin.

if you wanted to sort data showing through Sectional RecyclerAdapter or GridAdapter you are allow to override methods given bellow:

• compareSections with two parameters of type K i.e. SectionModel with int return type.
• compareSectionItems with two parameters of type T i.e. SectionItemModel with int return type.

these method are just like simple Comparator method onCompare

Copyright (C) 2018 Muhammad Muzammil Sharif

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:https://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.