I think, u missed two methods. But I have to thank you because I passed the challenge in the book perfectly.
And here is my code that I changed your code.
in CrimeListFragment
First of all, I defined the callbacks for OnDeleteCrimeListener and edit my onAttach and onDetach method.
private OnDeleteCrimeListener mDeleteCalLBack;
public interface OnDeleteCrimeListener {
void onCrimeIdSelected(UUID crimeId);
}
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.crime_activity_list, container, false);
mRecyclerView = (RecyclerView) v.findViewById(R.id.frecycle_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mRecyclerView.setHasFixedSize(true);
setCrimeRecyclerViewItemTouchListener();
return v;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
mCallback = (Callbacks) context;
mDeleteCalLBack = (OnDeleteCrimeListener) context;
}
@Override
public void onDetach() {
super.onDetach();
mCallback = null;
mDeleteCalLBack = null;
}
Then, I created a method that I gonna use it in CrimeListActivitiy later.
Because, I am using the sqlLite.
public void deleteCrime(UUID crimeId) {
Crime crime = CrimeLab.get(getActivity()).getCrime(crimeId);
CrimeLab.get(getActivity()).deleteCrime(crimeDec);
}
then I used your code.
public void setCrimeRecyclerViewItemTouchListener() {
ItemTouchHelper.SimpleCallback itemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
Crime crime= mAdapter.mCrimeList.get(position);
Log.d(TAG, "onSwiped: " + crime.getId());
mDeleteCalLBack.onCrimeIdSelected(crime.getId());
}
};
ItemTouchHelper iteItemTouchHelper = new ItemTouchHelper(itemTouchCallback);
iteItemTouchHelper.attachToRecyclerView(mRecyclerView);
}
Finally, in CrimeListActivity, I implemented this.
CrimeListFragment.OnDeleteCrimeListener
Then,
UPDATE 07.12.17
@Override
public void onCrimeIdSelected(UUID crimeId) {
CrimeFragment crimeFragment = (CrimeFragment) getSupportFragmentManager().findFragmentById(R.id.detail_fragment_container);
CrimeListFragment listFragment = (CrimeListFragment)getSupportFragmentManager().findFragmentById(R.id.fragment_container);
listFragment.deleteCrime(crimeId);
listFragment.updateUI();
// FIXME:For two- panel detail errors. when I want to delete item in list using the swipe. I took an error that recyclerview.setNextAnim(int) on a null object reference. And I added this code. Now swipe to remove perfect in the two-pane layout.
if(crimeFragment==null){
// here is empty. Because to delete an item from the list without selecting it in the two-pane layout.
}else {
// when you remove list item with using swipe, the detail screen is disappear.
listFragment.getActivity().getSupportFragmentManager().beginTransaction().remove(crimeFragment).commit();
}
}
UPDATE 07.12.17
And I added a method that Drawable for visuality.
After the onSwiped method, you can use it.
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
// get item
View itemview = viewHolder.itemView;
// get an icon from drawable folder
Drawable deleteIcon = ContextCompat.getDrawable(getContext(), R.drawable.ic_menu_delete);
// get height and width sizes from layout
float IcontHeight = deleteIcon.getIntrinsicHeight();
float IconWidth = deleteIcon.getIntrinsicWidth();
// get item's bottom and Top size
float itemHeight = itemview.getBottom() - itemview.getTop();
if (actionState == ACTION_STATE_SWIPE) { // user is swipe
Log.d(TAG, "////////////////////////////////////////////////");
Log.d(TAG, "ACTION STATE SWAP is true: ");
Resources r = getResources(); // as you read
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // create paint object
// get layout all values from inflate crime_fragment_list.xml
RectF layout = new RectF(itemview.getLeft(), itemview.getTop(), itemview.getRight(), itemview.getBottom());
// set color
paint.setColor(r.getColor(R.color.colorAccent));
// drawing canvas
c.drawRect(layout, paint);
// to calculate deleteIcon object that necessary values
int deleteIconTop = (int) (itemview.getTop() + (itemHeight - IcontHeight) / 2);
int deleteIconBottom = (int) (deleteIconTop + IcontHeight);
int deleteIconMargin = (int) ((itemHeight - IcontHeight) / 2);
int deleteIconLeft = (int)(itemview.getRight() - deleteIconMargin - IconWidth);
int deleteIconRight = (int) itemview.getRight() - deleteIconMargin;
// then set boundry that get values above
deleteIcon.setBounds(deleteIconLeft,deleteIconTop,deleteIconRight,deleteIconBottom);
// to add canvas
deleteIcon.draw(c);
/*c.save(); */
// you can find explanation here (1**)
getDefaultUIUtil().onDraw(c, recyclerView, viewHolder.itemView, dX, dY, actionState, isCurrentlyActive);
} else {
Log.d(TAG, "////////////////////////////////////////////////");
Log.d(TAG, "ACTION STATE SWAP is false: ");
}
}
(1**) explanation
