RecylerView - adapter

1.RecyclerView

Recyclerview Listview ve gridview'in yerine kullanıbilecek View Holder pattern'i kullanan yeni bir komponent.
Bir View'e ihtiyaç olduğunda layoutu inflate eden yeni bir ViewHolder objesi oluşur ve referansı saklanır liste her scroll olduğunda
bu objeyi kullanır. Bu nedenle adı recyclerView'miş :)
Diğer bir ozelliği LayoutManager, listedeki itemların dizilişlerini belirliyor.
1.LinearLayoutManager, klasik ListView
2.GridLayoutManager, GridView
3.StaggerGridLayoutManager kademeli,sıralı listview

2.act_message_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#FFFFFF"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:text="Title" />

    <TextView
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:text="Content" />
</LinearLayout>

3.row_message_list.xml

<?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="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical" />
</LinearLayout>

4.Message.java

public class Message {
    private String title;
    private String content;

    public Message(String title, String content) {
        this.title = title;
        this.content = content;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

5.MessageListActivity.java

public class MessageListActivity extends AppCompatActivity {

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;

    private List<Message> messageList;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.act_message_list);
        ButterKnife.bind(this);

        generateSomeDummyMessageList();
        setMessageList();
    }

    private void generateSomeDummyMessageList() {
        messageList = new ArrayList<>();
        messageList.add(new Message("Ada", "Lovelace"));
        messageList.add(new Message("James", "Gosling"));
        messageList.add(new Message("Dennis", "Ritchie"));
        messageList.add(new Message("Guido", "van Rossum"));
        messageList.add(new Message("Rasmus", " Lerdorf"));
        messageList.add(new Message("Larry", "Wall"));
        messageList.add(new Message("Brendan", " Eich"));
        messageList.add(new Message("Yukihiro", "Matsumoto"));
        messageList.add(new Message("John", "McCarthy"));
        messageList.add(new Message("Niklaus", " Wirth"));
        messageList.add(new Message("Bjarne", "Stroustrup"));
    }

    private void setMessageList() {
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        //LinearLayout with orientation
        RecyclerView.LayoutManager layoutManager1 = new LinearLayoutManager(this,
                LinearLayoutManager.HORIZONTAL,
                false);
        //GridLayout
        GridLayoutManager gridLayoutManager = new GridLayoutManager(this,
                2,/*Number of grid columns*/
                GridLayoutManager.VERTICAL,
                false);

        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                //Stagger every other row
                return position % 3 == 0 ? 2 : 1;
            }
        });

        //StaggeredGridLayout
        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(
                2,/*Number of grid columns*/
                StaggeredGridLayoutManager.VERTICAL);
        
        
        //Divider
         DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(
                this,
                DividerItemDecoration.VERTICAL);
        mDividerItemDecoration.setDrawable(ContextCompat.getDrawable(this, R.drawable.list_divider_with_space));
        customerListView.addItemDecoration(mDividerItemDecoration);
        
        
        MessageListAdapter adapter = new MessageListAdapter(messageList);
        recyclerView.setAdapter(adapter);
    }

}

6.BaseRecyclerViewAdapter.java

public abstract class BaseRecyclerViewAdapter<E extends BaseRecyclerViewHolder> extends RecyclerView.Adapter<E> {
}

7.MessageListAdapter.java

public class MessageListAdapter extends BaseRecyclerViewAdapter<MessageListHolder> {
    private List<Message> messageList;

    public MessageListAdapter(List<Message> messageList) {
        this.messageList = messageList;
    }

    @Override
    public MessageListHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new MessageListHolder(parent, R.layout.row_message_list);
    }

    @Override
    public void onBindViewHolder(MessageListHolder holder, int position) {
        holder.bindView(messageList.get(position));
    }

    @Override
    public int getItemCount() {
        return messageList.size();
    }
}

8.BaseRecyclerViewHolder.java

public abstract class BaseRecyclerViewHolder extends RecyclerView.ViewHolder {

    protected BaseRecyclerViewHolder(ViewGroup parentView, @LayoutRes int layoutResId) {
        this(LayoutInflater.from(parentView.getContext()).inflate(layoutResId, parentView, false));
    }

    private BaseRecyclerViewHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
    }
}

9.MessageListHolder.java

public class MessageListHolder extends BaseRecyclerViewHolder {

    @BindView(R.id.title)
    TextView titleTextView;

    @BindView(R.id.content)
    TextView contentTextView;

    protected MessageListHolder(ViewGroup parentView, @LayoutRes int layoutResId) {
        super(parentView, layoutResId);
    }

    public void bindView(Message message){
        titleTextView.setText(message.getTitle());
        contentTextView.setText(message.getContent());
    }


}

list_divider_with_space.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:height="1dp">
        <shape>
            <solid android:color="#d9dcdf" />
        </shape>
    </item>

    <item
        android:height="8dp"
        android:top="1dp">
        <shape>
            <solid android:color="@android:color/transparent" />

        </shape>
    </item>
</layer-list>