recyclerview 中的小吃店

Question

how can I show the snackbar at the bottom of page? I want to show snackbar when clicked on like. I used snackbar in an item of recycleview (crdLayout) so It has been shown at bottom of each item here is the code:

public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {
            itemHolder.like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar snackbar = Snackbar
                        .make(itemHolder.crdLayout, "liked", Snackbar.LENGTH_LONG)         
                                snackbar1.show();
            }
        });

the snackbar each time dont pop up at the bottom of page and instead it comes at bottom of each cardview

Answer 1

In your Snackbar , you are giving the parameter as itemholder.cardLayout . So the snackbar will appear below the card layout. You should give the root view of the page to make it appear on the bottom of the page

There are two ways you can achieve this. One is to pass the rootview in the constructor of the RecyclerViewAdapter class and pass the argument to the Snackbar . Another way is to use a callback method in your Activity or Fragment class that calls your RecyclerViewAdapter class.

For the first method, You just pass the rootView of the page as a constructor parameter and pass the argument in the Snackbar .

For the second method, You can create an interface in the RecyclerViewAdapter class, pass the interface instance as a parameter in the constructor, creating a method in the interface and notifying the method when the item has been clicked. Then you can show the Snackbar in your Activity class itself. See the code below,

public class YourActivity implements RecyclerViewAdapter.CallbackListener{
     View rootView;
     @Override
     protected void onCreate(Bundle savedInstanceState){
        //
        rootView = findViewById(R.id.my_root_view);
        // 
        //
        RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(this);
        //
        //
     }

     @Override
     public void onItemClicked(){
         Snackbar snackbar = Snackbar.make(rootView, "liked", Snackbar.LENGTH_LONG);
         snackbar.show();             
     }
}

And your RecyclerViewAdapter class will be,

public class RecyclerViewAdapter {
    CallbackListener listener;
            
    public RecyclerViewAdapter (CallbackListener listener){
         this.listener = listener;
    }
        
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {
         itemHolder.like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
             listener.onItemClicked();
            }
     });
    
     public interface CallbackListener{
         void onItemClicked();
     }
}

Though first method is so simple, second method gives you more encapsulation, more cleaner code and more control over code.

Answer 2

1. Set a CoordinatorLayout within your existing Activity layout.
2. Pass the CoordinatorLayout as the first argument of the Snackbar.make() command.

Thus in the end it should look this:

public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {

            itemHolder.like.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    final View my_new_view = findViewById(R.id.myCoordinatorLayout); //define your CoordinatorLayout
                    Snackbar snackbar = Snackbar
                            .make(myCoordinatorLayout, "liked", Snackbar.LENGTH_LONG); //set CoordinatorLayout as first argument
                    snackbar1.show();
                }
            });

Your Snackbar being shown at the bottom of the CoordinatorLayout .

Answer 3

If you are trying to show Snackbar for whole screen, don't pass View/ViewGroup/Layout of parent Activity/Fragment to Adapter.

Instead pass Callback/Listener to RecyclerView Adapter from Activity/Fragment . This way when item is clicked, you trigger callback. Activity/Fragment listening to that callback will get triggered and you can now show Snackbar/Toast/CustomView...