DragBoardView

DragBoardView is a draggable kanban/board view for Android. it supports drag item, drag column, auto center

You can just use it like a RecyclerView!

Just use it like a RecyclerView! 中文文档

How to use Recyclerview:

1. Add dependency for recyclerview

compile 'com.android.support:recyclerview-v7:23.1.0'

Add recyclerview in main layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <android.support.v7.widget.RecyclerView
        android:id="@+id/item_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"
        />
</LinearLayout>

2. Make one item layout xml file

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">

    <TextView
        android:id="@+id/txtChords"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_gravity="center_horizontal"
        />
    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/txtLyrics"/>

</LinearLayout>

3. Make model class for each item in list.

it can be any custom class.

public class Item {

    private String name;

    public Item(String n) {
        name = n;
    }
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

4. make adapter for recyclerview

import androidx.recyclerview.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.codexpedia.list.viewholder.R;
import java.util.ArrayList;

public class ItemArrayAdapter extends RecyclerView.Adapter<ItemArrayAdapter.ViewHolder> {

    //All methods in this adapter are required for a bare minimum recyclerview adapter
    private int listItemLayout;
    private ArrayList<Item> itemList;
    // Constructor of the class
    public ItemArrayAdapter(int layoutId, ArrayList<Item> itemList) {
        listItemLayout = layoutId;
        this.itemList = itemList;
    }

    // get the size of the list
    @Override
    public int getItemCount() {
        return itemList == null ? 0 : itemList.size();
    }


    // specify the row layout file and click for each row
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(listItemLayout, parent, false);
        ViewHolder myViewHolder = new ViewHolder(view);
        return myViewHolder;
    }

    // load data in each row element
    @Override
    public void onBindViewHolder(final ViewHolder holder, final int listPosition) {
        TextView item = holder.item;
        item.setText(itemList.get(listPosition).getName());
    }

    // Static inner class to initialize the views of rows
    static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        public TextView item;
        public ViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(this);
            item = (TextView) itemView.findViewById(R.id.txtChords);
        }
        @Override
        public void onClick(View view) {
            Log.d("onclick", "onClick " + getLayoutPosition() + " " + item.getText());
        }
    }

5. bind adapter with recyclerview

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.codexpedia.list.viewholder.R;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initializing list view with the custom adapter
        ArrayList <Item> itemList = new ArrayList<Item>();

        ItemArrayAdapter itemArrayAdapter = new ItemArrayAdapter(R.layout.list_item, itemList);
        recyclerView = (RecyclerView) findViewById(R.id.item_list);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(itemArrayAdapter);

        // Populating list items
        for(int i=0; i<100; i++) {
            itemList.add(new Item("Item " + i));
        }

    }

}

As for DragBoardView, it's all the same.

How to use DragBoardView:

1. Add dependency for DragBoardView

Add it in your root build.gradle at the end of repositories:

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

Add the dependency

dependencies {
    compile 'com.github.LinXueyuanStdio:DragBoardView:v1.0.0'
}

declare it in your main layout xml file:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"/>

    <com.time.cat.dragboardview.DragBoardView
        android:id="@+id/layout_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/toolbar"/>

</RelativeLayout>

2. Make two item layout xml files.

One for each column item. it should contains a RecyclerView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/col_content_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

</RelativeLayout>

One for the item in each column.

<TextView
    android:id="@+id/item_title"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="item"/>

3. Make model class for each column and each item in list.

for each column, it should implement DragColumn interface.

public class Entry implements DragColumn {
    private final String name;
    private int columnIndex;
    private final List<DragItem> itemList;

    public Entry(String name, int columnIndex, List<DragItem> items) {
        this.name = name;
        this.columnIndex = columnIndex;
        this.itemList = items;
    }

    public String getName() {
        return name;
    }

    public List<DragItem> getItemList() {
        return itemList;
    }

    @Override
    public int getColumnIndex() {
        return columnIndex;
    }

    @Override
    public void setColumnIndex(int columnIndexInHorizontalRecycleView) {
        //save to database here
    }
}

for each item in the column, it should implement DragItem interface.

public class Item implements DragItem {
    private final String itemName;
    private int colIndex;
    private int itemIndex;

    public Item(String itemName, int colIndex, int itemIndex) {
        this.itemName = itemName;
        this.colIndex = colIndex;
        this.itemIndex = itemIndex;
    }

    public String getItemName() {
        return itemName;
    }

    @Override
    public int getColumnIndex() {
        return colIndex;
    }

    @Override
    public int getItemIndex() {
        return itemIndex;
    }

    @Override
    public void setColumnIndex(int columnIndexInHorizontalRecycleView) {
        //save to database here
    }

    @Override
    public void setItemIndex(int itemIndexInVerticalRecycleView) {
        //save to database here
    }
}

4. make adapter for DragBoardView

public class ColumnAdapter extends HorizontalAdapter<ColumnAdapter.ViewHolder>
public class ItemAdapter extends VerticalAdapter<ItemAdapter.ViewHolder>

5. bind adapter with DragBoardView

public class MainActivity extends AppCompatActivity {

    DragBoardView dragBoardView;
    List<DragColumn> mData = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dragBoardView = findViewById(R.id.layout_main);
        mAdapter = new ColumnAdapter(this);
        mAdapter.setData(mData);
        dragBoardView.setHorizontalAdapter(mAdapter);
    }

}