ViewHolder ImageView Android

Question

I've designed a Chord object that is made of two Strings and an ImageView.

public class Accordo {
private String nome, note;
private ImageView imagine;

// all the get and set methods
}

when I want to refer to it in my custom ViewHolder, more specifically when I @override the onBindViewHolder() method, I write:

holder.nome.setText(chord.getNome());
holder.note.setText(chord.getNote());

for TextViews I can use the setText() method. But what is the equivalent for ImageViews ?

EDIT I could use setImageResource() but it takes an int from a drawable.

Since I need a recyclerView with a different Image for every row, I need something that I can setup later in another class and have something like:

private void prepareMovieData() {
        Movie movie = new Movie("Mad Max: Fury Road", "Action & Adventure", "**LocallyStoredImage**");
        movieList.add(movie);
        ...
    }

Answer 1

Consider this approach:

• First, inside the class (Activity or Fragment) that shows the RecyclerView items, define a primitive array of drawables like this:

   private int[] menuIcons = { R.drawable.user, R.drawable.customer, R.drawable.list, R.drawable.leads }; 

• Also create an instance of your Adapter here for later;

   private SampleRecyclerAdapter mAdapter; 

Still from your Activity or Fragment, initialize your values

private void initRecyclerViewData(){

   List<SampleData> data = new ArrayList<>();

   data.add(new DataObject("Title of row 1", menuIcons[0]));
   data.add(new DataObject("Title of row 2", menuIcons[1]));
   data.add(new DataObject("Title of row 3", menuIcons[2]));
   data.add(new DataObject("Title of row 4", menuIcons[3]));

   //now initialize your adapter - we will create the adapter next
   mAdapter = new SampleRecyclerAdapter(data);
   mRecyclerView.setAdapter(mAdapter);
   mAdapter.notifyDataSetChanged();
}

Now that we have initialized our adapter, let us see how we can show the images inside the adapter - when the view is bound;

//inside your Adapter class;

....

private List<DataObject> mMenuItemObjects;

public SampleRecyclerAdapter(List<DataObject> menuItemObjects) {
    mMenuItemObjects = menuItemObjects;
}

@Override
public void onBindViewHolder(MainMenuViewHolder holder, int position) {
    holder.itemName.setText(mMenuItemObjects.get(position).getName());

    holder.itemIcon.setImageResource(mMenuItemObjects.get(position).getIcon());
}

That code above means that you have an ArrayList of type DataObject. Remember, when we instantiated our adapter in the activity, we passed an array of data each of which had a title and an icon (drawable).

That is the easiest way to set your image on the recyclerviewer inside onBindViewHolder method.

NOTE: You must create a ViewHolder class and DataObject (latter is a plain old java object).

Good luck and I hope this helps!

Answer 2

等效的图像将是setImageResource（）。

holder.imagine.setImageResource(chord.getImage());

Answer 3

1. Make a class which would hold your titles and images
2. Make a ArrayList of that particular class.
3. Add Data to the Arraylist
4. Call adapter.notifydatasetchanged() after your list.add(...)
5. use something like Picasso in your onBindViewHolder() to load images(guessing that the images come from some kind of database in URI Form)