原文Android swipe menu with RecyclerView
public class SwipeController extends ItemTouchHelper.Callback {
boolean swipeBack =false;
@Override
public int getMovementFlags(RecyclerView p1, RecyclerView.ViewHolder p2) {
return makeMovementFlags(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);
}
@Override
public boolean onMove(RecyclerView p1, RecyclerView.ViewHolder p2, RecyclerView.ViewHolder p3) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder p1, int p2) {
}
@Override
public int convertToAbsoluteDirection(int flags, int layoutDirection) {
if (swipeBack) {
swipeBack = false;
return 0;
}
return super.convertToAbsoluteDirection(flags, layoutDirection);
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
setOnTouch(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
private void setOnTouch(final Canvas c, final RecyclerView rv, final RecyclerView.ViewHolder holder, final float dX, final float dY, final int actionState, final boolean isCurrentlyActive) {
rv.setOnTouchListener(new View.OnTouchListener(){
@Override
public boolean onTouch(View p1, MotionEvent e) {
swipeBack=e.getAction()==MotionEvent.ACTION_CANCEL||e.getAction()==MotionEvent.ACTION_UP;
if(listener!=null && swipeBack && Math.abs(dX-dY)>0) listener.onSwipe(holder.getAdapterPosition());
return false;
}
});
}
OnSwipeListener listener;
public SwipeController setOnSwipeListener(OnSwipeListener listener){
this.listener=listener;
return this;
}
public interface OnSwipeListener{
void onSwipe(int position);
}
}
