Drag and Drop adapter implementation for RecyclerView. Targeted to support any LayoutManager and ItemAnimator.
Note: This is an advanced library meant to be flexible and customizable which leads to more complexity in integration. It is not meant to be a simple drop-in. If you need even more customization I suggest exploring the source and copying relevant code that you need.
Add Snapshot repository and add to dependencies:
dependencies {
compile 'com.makeramen:dragsortadapter:1.0.1'
}
Override DragSortAdapter<T extends DragSortAdapter.ViewHolder>, see ExampleAdapter.java:
required functions:
// this function should be reasonable performant as it gets called a lot on the UI thread
public abstract int getPositionForId(long id);
// this needs to re-order the positions **live** during dragging
public abstract boolean move(int fromPosition, int toPosition);
// not required but you probably want to override this to save the re-ordering after drop event
public void onDrop() { }Set adapter in code:
recyclerView.setAdapter(new ExampleAdapter(recyclerView));Call startDrag() when you want to start dragging (e.g. onLongClick):
@Override public boolean onLongClick(@NonNull View v) {
startDrag();
return true;
}Works with any LayoutManager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));And any ItemAnimator:
recyclerView.setItemAnimator(new DefaultItemAnimator());
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