Customarrayadapter Implementation:unable To Get The Resource Id

I want to implement CustomArrayAdapter and following is the constructor I have written for my custom adapter public CustomUsersAdapter(Context context, ArrayList users)

Solution 1:

 I dont know which resource ID is being referred here.

Since you put 0 in the second parameter of the constructor it wont have any reference to any layout

as the documentation is saying:

 resource   The resource ID for a layout file containing a layout to use when instantiating views.

Now if you put an existing layout to the constructor then that layout will be use to instantiate the view of your listViewItems but you need to override the getView method to enable you to design which text goes where in your layout.

If you are planning to put an existing layout then use another constructor on it:

publicArrayAdapter(Context context, int resource, T[] objects)

But for design I wont really add any resource layout to the constructor but directly inflate the view in your getView method and return that view.

Solution 2:

Try this way,hope this will help you to solve your problem.

classCustomUsersAdapterextendsBaseAdapter {

    private Context context;
    pArrayList<User> users;


    publicCustomUsersAdapter(Context context,ArrayList<User> users) {
        this.context = context;
        this.users = users;
    }

    publicclassViewHolder {
        TextView tvName;
        TextView tvHometown;
    }


    @OverridepublicintgetCount() {
        return users.size();
    }

    @Overridepublic Object getItem(int position) {
        return users.get(position);
    }

    @OverridepubliclonggetItemId(int position) {
        return position;
    }

    public View getView(finalint position, View view, ViewGroup parent) {
        final ViewHolder holder;
        if (view == null) {
            holder = newViewHolder();
            view = LayoutInflater.from(context).inflate(R.layout.item_user, null);
            holder.tvName = (TextView) view.findViewById(R.id.tvHometown);
            holder.tvHometown = (TextView) view.findViewById(R.id.tvHometown);
            view.setTag(holder);
        } else {
            holder = (ViewHolder) view.getTag();
        }
        holder.tvName.setText(users.get(position).name);
        holder.tvHometown.setText(users.get(position).hometown);
        return view;
    }
}

Solution 3:

You need to us your layout file in that constructor. So you need to change your constructor from

public CustomUsersAdapter(Context context, ArrayList<User> users) {
    super(context, 0, users);
 }

to

publicCustomUsersAdapter(Context context, int resLayout , ArrayList<User> users) {
    super(context, resLayout , users);
 }

resLayout is the ID for your layout xml file which will be in your custom adapter class.

And the Syntax for ArrayAdapter is

publicArrayAdapter(Context context, int resource, T[] objects)

For more info you can check this

Solution 4:

I'm not quite sure what you're going to use your ArrayAdapter for, but one reason for using an ArrayAdapter is to display a listView of a layout depending on the array.

Here is an example of what the constructor should look like

publicCustomListAdapter() {
    super(Activity_Main.class, R.layout.listview_item, array);
}

Here is what could be in your listview_item :

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="name"android:id="@+id/name" /></LinearLayout>

Basically, the CustomListAdapter will generate X number of listview_item layouts height wise in a ListView, where X is the size of array.

Hope this helps.