CODEWITHSUNDEEP
androidandroid-recyclerviewitemtouchhelper
Jyoti JK
Jyoti JK

Reputation: 2171

Recyclerview Drag and Drop ontouch

I have used ItemTouchHelper to implement drag and drop in recyclerview. It works fine. But it is working only on long press. I need to do it with onTouch

ItemTouchHelper.Callback itemTouchHelperCallback = new ItemTouchHelper.Callback() {
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        Collections.swap(strings, viewHolder.getAdapterPosition(), target.getAdapterPosition());
        adapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition());
        return true;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        //TODO
    }

   //defines the enabled move directions in each state (idle, swiping, dragging).
     @Override
     public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
         return makeFlag(ItemTouchHelper.ACTION_STATE_DRAG,
             ItemTouchHelper.DOWN | ItemTouchHelper.UP | ItemTouchHelper.START | ItemTouchHelper.END);
         }
    };

This is the code I used. Please help me!!!

Upvotes: 5

Views: 5049

Answers (2)

J.D
J.D

Reputation: 58

You can use following code inside onBindViewHolder to start drag by touch

holder.layout.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event) {

        ClipData data = ClipData.newPlainText("", "");
        View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
        view.startDrag(data, shadowBuilder, view, 0);
        view.setVisibility(View.INVISIBLE);

        return false;
    }
});

layout mean your item layout. after you can use DragListener for the all other events, like

DragEvent.ACTION_DRAG_STARTED
DragEvent.ACTION_DRAG_ENTERED
DragEvent.ACTION_DRAG_EXITED
DragEvent.ACTION_DROP
DragEvent.ACTION_DRAG_ENDED

Upvotes: 2

Dewey Reed
Dewey Reed

Reputation: 4956

  1. Override ItemTouchHelper's isLongPressDragEnabled and return false

    https://developer.android.com/reference/android/support/v7/widget/helper/ItemTouchHelper.Callback#isLongPressDragEnabled()

    override fun isLongPressDragEnabled(): Boolean = false

  2. Add a callback to ViewHolder's implementation and use this

    buttonToDrag.setOnTouchListener { v, event ->
    listener.onTouch(this, event)
    false
}

  3. In the activity or fragment, use startDrag

    private lateinit var itemTouchHelper: ItemTouchHelper

override fun onTouch(viewHolder: RecyclerView.ViewHolder, event: MotionEvent) {
    if (event.actionMasked == MotionEvent.ACTION_DOWN) {
        itemTouchHelper.startDrag(viewHolder)
    }
}

I found the implementation in the doc of https://developer.android.com/reference/android/support/v7/widget/helper/ItemTouchHelper#startdrag

I've tried it personally and it works like a charm.

Upvotes: 11

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