Hướng dẫn tạo Horizontal RecyclerView giống như trên app Play Store.
Đầu tiên mở file Build gradle lên thêm các phụ thuộc sau:
compile 'com.android.support:recyclerview-v7:25.1.1' compile 'com.android.support:cardview-v7:25.1.1'
1.Tạo Model SingleItemModel.java
Model này có tác dụng lưu trữ dữ liệu của các đối tượng con.
public class SingleItemModel {
private String name;
private String url;
private String description;
public SingleItemModel() {
}
public SingleItemModel(String name, String url) {
this.name = name;
this.url = url;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
2. Tạo đối tượng SectionDataModel.jva
Đối tượng này dùng để lưu dữ liệu của một section. Nghĩa là 1 section sẽ gồm có một Tiêu đề và nhiều đối tượng con bên trong.
public class SectionDataModel {
private String headerTitle;
private ArrayList<SingleItemModel> allItemsInSection;
public SectionDataModel() {
}
public SectionDataModel(String headerTitle, ArrayList<SingleItemModel> allItemsInSection) {
this.headerTitle = headerTitle;
this.allItemsInSection = allItemsInSection;
}
public String getHeaderTitle() {
return headerTitle;
}
public void setHeaderTitle(String headerTitle) {
this.headerTitle = headerTitle;
}
public ArrayList<SingleItemModel> getAllItemsInSection() {
return allItemsInSection;
}
public void setAllItemsInSection(ArrayList<SingleItemModel> allItemsInSection) {
this.allItemsInSection = allItemsInSection;
}
}
3. Tạo file list_item.xml
File này là giao diện của 1 section.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:selectableItemBackground"
android:orientation="vertical"
android:padding="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="2dp">
<TextView
android:id="@+id/itemTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_gravity="center_vertical"
android:layout_toLeftOf="@+id/btnMore"
android:text="Sample title"
android:textColor="@android:color/black"
android:textSize="18sp" />
<Button
android:id="@+id/btnMore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="more"
android:background="@color/colorPrimary"
android:textColor="#FFF" />
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view_list"
android:layout_width="match_parent"
android:layout_height="160dp"
android:layout_gravity="center_vertical"
android:orientation="horizontal" />
</LinearLayout>
4. Tạo tiếp file list_single_card.xml
File này dùng hiện thị một đối tượng con trong section.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:cardCornerRadius="5dp"
app:cardUseCompatPadding="true"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="0dp"
android:background="?android:selectableItemBackground"
android:orientation="vertical">
<ImageView
android:id="@+id/itemImage"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"
android:scaleType="fitCenter"
android:src="@drawable/android" />
<TextView
android:id="@+id/tvTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/itemImage"
android:gravity="center"
android:padding="5dp"
android:text="Sample title"
android:textColor="@android:color/black"
android:textSize="18sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
5. Ở activity_main.xml thêm một recyclerview như sau:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.lynkdev.horizontalrecyclerview.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/my_recycler_view"/>
</RelativeLayout>
6. Tạo SectionListDataAdapter.java như sau
public class SectionListDataAdapter extends RecyclerView.Adapter<SectionListDataAdapter.SingleItemRowHolder> {
private ArrayList<SingleItemModel> itemsList;
private Context mContext;
public SectionListDataAdapter(Context context, ArrayList<SingleItemModel> itemsList) {
this.itemsList = itemsList;
this.mContext = context;
}
@Override
public SingleItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_single_card, null);
SingleItemRowHolder mh = new SingleItemRowHolder(v);
return mh;
}
@Override
public void onBindViewHolder(SingleItemRowHolder holder, int i) {
SingleItemModel singleItem = itemsList.get(i);
holder.tvTitle.setText(singleItem.getName());
}
@Override
public int getItemCount() {
return (null != itemsList ? itemsList.size() : 0);
}
public class SingleItemRowHolder extends RecyclerView.ViewHolder {
private TextView tvTitle;
private ImageView itemImage;
private SingleItemRowHolder(View view) {
super(view);
this.tvTitle = (TextView) view.findViewById(R.id.tvTitle);
this.itemImage = (ImageView) view.findViewById(R.id.itemImage);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), tvTitle.getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
}
7. Tạo MyDataAdapter.java như sau:
public class MyDataAdapter extends RecyclerView.Adapter<MyDataAdapter.ItemRowHolder> {
private ArrayList<SectionDataModel> dataList;
private Context mContext;
public MyDataAdapter(Context context, ArrayList<SectionDataModel> dataList) {
this.dataList = dataList;
this.mContext = context;
}
@Override
public ItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);
return new ItemRowHolder(v);
}
@Override
public void onBindViewHolder(ItemRowHolder itemRowHolder, int i) {
final String sectionName = dataList.get(i).getHeaderTitle();
ArrayList singleSectionItems = dataList.get(i).getAllItemsInSection();
itemRowHolder.itemTitle.setText(sectionName);
SectionListDataAdapter itemListDataAdapter = new SectionListDataAdapter(mContext, singleSectionItems);
itemRowHolder.recycler_view_list.setHasFixedSize(true);
itemRowHolder.recycler_view_list.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
itemRowHolder.recycler_view_list.setAdapter(itemListDataAdapter);
itemRowHolder.recycler_view_list.setNestedScrollingEnabled(false);
itemRowHolder.btnMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Click event on more, "+ sectionName , Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return (null != dataList ? dataList.size() : 0);
}
public class ItemRowHolder extends RecyclerView.ViewHolder {
private TextView itemTitle;
private RecyclerView recycler_view_list;
private Button btnMore;
private ItemRowHolder(View view) {
super(view);
this.itemTitle = (TextView) view.findViewById(R.id.itemTitle);
this.recycler_view_list = (RecyclerView) view.findViewById(R.id.recycler_view_list);
this.btnMore= (Button) view.findViewById(R.id.btnMore);
}
}
}
8. Quay lại MainActivity.java để thiết lập các Adapter
public class MainActivity extends AppCompatActivity {
ArrayList<SectionDataModel> allSampleData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
allSampleData = new ArrayList<SectionDataModel>();
createDummyData();
RecyclerView myRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
myRecyclerView.setHasFixedSize(true);
MyDataAdapter adapter = new MyDataAdapter(this, allSampleData);
myRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
myRecyclerView.setAdapter(adapter);
}
//Tạo dữ liệu
public void createDummyData() {
for (int i = 1; i <= 5; i++) {
SectionDataModel dm = new SectionDataModel();
dm.setHeaderTitle("Section " + i);
ArrayList<SingleItemModel> singleItem = new ArrayList<SingleItemModel>();
for (int j = 0; j <= 5; j++) {
singleItem.add(new SingleItemModel("Item " + j, "URL " + j));
}
dm.setAllItemsInSection(singleItem);
allSampleData.add(dm);
}
}
}
Done tiến hành chạy app kiểm tra.
Link GitHub
Bài viết được Edit từ android-pratap.blogspot.com
