java - CardView setCardBackgroundColor won't work

Question

I have made an adapter of CardView through the RecyclerView for me to use the same template of card for this feature of mine.

The objective is to create certain cards with different colors, based on the parameter inc_status in INCCards.java. But it doesn't just seem to work.

Here's the source code for the template card:

item_inc_card.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/spacing_medium"
    android:paddingRight="@dimen/spacing_medium"
    android:paddingTop="@dimen/spacing_medium"
    android:background="@color/tertiary">

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardCornerRadius="@dimen/spacing_none">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingLeft="@dimen/spacing_large"
                android:paddingRight="@dimen/spacing_large"
                android:paddingTop="@dimen/spacing_large"
                android:paddingBottom="@dimen/spacing_medium"
                android:id="@+id/relative_layout">

                <TextView
                    android:id="@+id/course_code"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentLeft="true"
                    android:textColor="@color/white"
                    android:textSize="@dimen/text_headline"
                    android:text="@string/course_code"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/course_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/course_code"
                    android:textColor="@color/white"
                    android:textSize="@dimen/text_subhead"
                    android:text="@string/course_title" />

                <TextView
                    android:id="@+id/faculty"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@color/white"
                    android:layout_below="@+id/course_title"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:textStyle="italic"
                    android:textSize="@dimen/text_body"
                    android:text="@string/faculty" />


                <ImageView
                    android:id="@+id/status_icon"
                    android:src="@drawable/icon_avatar"
                    android:layout_width="@dimen/size_user_icon"
                    android:layout_height="@dimen/size_user_icon"
                    android:layout_above="@+id/faculty"
                    android:layout_alignParentRight="true"
                    android:layout_alignParentEnd="true" />

                <TextView
                    android:id="@+id/inc_grade"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="@dimen/text_body"
                    android:layout_below="@+id/status_icon"
                    android:layout_alignRight="@+id/status_icon"
                    android:layout_alignEnd="@+id/status_icon"
                    android:layout_alignLeft="@+id/status_icon"
                    android:layout_alignStart="@+id/status_icon"
                    android:gravity="center"
                    android:textAlignment="center"
                    android:textColor="@color/white"
                    android:text="@string/equiv_grade"/>

            </RelativeLayout>

            <TextView
                android:layout_width="fill_parent"
                android:layout_height="0.001dp"
                android:background="#FFFFFF"
                android:id="@+id/line_divider"/>

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingLeft="@dimen/spacing_large"
                android:paddingRight="@dimen/spacing_medium"
                android:paddingBottom="@dimen/spacing_medium"
                android:layout_marginTop="@dimen/spacing_medium"
                android:id="@+id/semesterInfoLinearLayout">

                <TextView
                    android:id="@+id/section"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="@dimen/text_caption"
                    android:text="@string/section"
                    android:textColor="@color/white"
                    android:layout_weight="0.33" />

                <TextView
                    android:id="@+id/semester"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="@dimen/text_caption"
                    android:text="@string/semester"
                    android:textColor="@color/white"
                    android:layout_weight="0.33"
                    android:gravity="center" />

                <TextView
                    android:id="@+id/acad_year"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="@dimen/text_caption"
                    android:text="@string/acad_year"
                    android:textColor="@color/white"
                    android:layout_weight=".33"
                    android:gravity="right" />
            </LinearLayout>

        </LinearLayout>


    </android.support.v7.widget.CardView>

</LinearLayout>

---

And for the fragment layout:

item_inc_card.xml

<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_inc_cards"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/tertiary"/>

---

To where each card is initialized by the object

INCCards.java

package ph.edu.amitypipduo.myiit;

public class INCCards {
    String course_code, course_title, faculty, section, semester, acad_year;
    int inc_status, status_icon;
    final String inc_grade = "INC 3.00";

    public INCCards(String course_code, String course_title, String faculty, String section, String semester, String acad_year, String inc_status) {
        this.course_code = course_code;
        this.course_title = course_title;
        this.faculty = faculty;
        this.section = section;
        this.semester = semester;
        this. acad_year = acad_year;

        switch (inc_status) {
            case "notice":
                this.inc_status = R.color.inc_notice;
                this.status_icon = R.drawable.inc_notice;
                break;
            case "alert":
                this.inc_status = R.color.inc_alert;
                this.status_icon = R.drawable.inc_alert;
                break;
            case "warning":
                this.inc_status = R.color.inc_warning;
                this.status_icon = R.drawable.inc_warning;
                break;
            case "danger":
                this.inc_status = R.color.inc_danger;
                this.status_icon = R.drawable.inc_danger;
                break;
        }

    }

}

---

I tried setting the background color of the card at method onBindViewHolder by:

cardViewHolder.card_view.setCardBackgroundColor(inc_cards.get(i).inc_status);

as seen here in

INCAdapter.java

package ph.edu.amitypipduo.myiit;

import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class INCAdapter extends RecyclerView.Adapter<INCAdapter.CardViewHolder> {
    List<INCCards> inc_cards;

    public INCAdapter(List<INCCards> inc_cards){
        this.inc_cards = inc_cards;
    }

    @Override
    public CardViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_inc_card, viewGroup, false);
        CardViewHolder card_view_holder = new CardViewHolder(view);
        return card_view_holder;
    }

    @Override
    public void onBindViewHolder(CardViewHolder cardViewHolder, int i) {
        cardViewHolder.course_code.setText(inc_cards.get(i).course_code);
        cardViewHolder.course_title.setText(inc_cards.get(i).course_title);
        cardViewHolder.faculty.setText(inc_cards.get(i).faculty);
        cardViewHolder.section.setText(inc_cards.get(i).section);
        cardViewHolder.semester.setText(inc_cards.get(i).semester);
        cardViewHolder.acad_year.setText(inc_cards.get(i).acad_year);
        cardViewHolder.inc_grade.setText(inc_cards.get(i).inc_grade);
        cardViewHolder.status_icon.setImageResource(inc_cards.get(i).status_icon);
        cardViewHolder.card_view.setCardBackgroundColor(inc_cards.get(i).inc_status);
    }

    @Override
    public int getItemCount() {
        return inc_cards.size();
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    public static class CardViewHolder extends RecyclerView.ViewHolder {
        CardView card_view;
        TextView course_code, course_title, faculty, section, semester, acad_year, inc_grade;
        ImageView status_icon;


        CardViewHolder(View itemView) {
            super(itemView);
            card_view = (CardView) itemView.findViewById(R.id.card_view);

            course_code = (TextView) itemView.findViewById(R.id.course_code);
            course_title = (TextView) itemView.findViewById(R.id.course_title);
            faculty = (TextView) itemView.findViewById(R.id.faculty);
            inc_grade = (TextView) itemView.findViewById(R.id.inc_grade);
            section = (TextView) itemView.findViewById(R.id.section);
            semester = (TextView) itemView.findViewById(R.id.semester);
            acad_year = (TextView) itemView.findViewById(R.id.acad_year);

            status_icon = (ImageView) itemView.findViewById

Answer 1

Change

cardViewHolder.card_view.setCardBackgroundColor(inc_cards.get(i).inc_status);

to

int colorId = inc_cards.get(i).inc_status;
int color = cardViewHolder.card_view.getContext().getResources().getColor(colorId);
cardViewHolder.card_view.setCardBackgroundColor(color);

You are using the value from R.color instead of the value you set in your XML.