[FIXED] Random Color for each row in a list view from array of colors

Issue

I am setting the background color for each row in my customadapter as

public View getView(int position, View convertView, ViewGroup parent) {





    if (inflater == null)
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.coupon_list_row, null);
        int temp_index = ExtraFu.randInt(0, 9);
        convertView.setBackgroundColor(color_arr[temp_index]);
        Log.d("temp_index", String.valueOf(temp_index));
    }

My array of color

int color_arr[]={R.color.cred,R.color.cpink,R.color.cpurple,R.color.cdpurple,R.color.cindigo,R.color.cblue,R.color.cdorange,R.color.cgreen,R.color.cbroun,R.color.ccyan};

this is the function randInt

  public static int randInt(int min, int max) {

    // Usually this can be a field rather than a method variable
    Random rand = new Random();

    // nextInt is normally exclusive of the top value,
    // so add 1 to make it inclusive
    int randomNum = rand.nextInt((max - min) + 1) + min;

    return randomNum;
}  

the row background is set to two color. Is that the random number is generated same all the time?

Solution

  if (position%4 == 0){
             // set convertView Background          
        } else if (position%4 == 1){
            // set convertView Background  
        } else if (position%4 == 2){
            // set convertView Background  
        } else if (position%4 == 3){
            // set convertView Background  
        }

This will randomly generate the four different color in your listview.

inside adapter

  @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = lv.inflate(res, null);
            holder = new ViewHolder();
            holder.textView = (TextView)convertView.findViewById(R.id.text);
            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        if (position%4 == 0){
            holder.textView.setBackgroundColor(Color.parseColor("#1e86cf"));
        } else if (position%4 == 1){
            holder.textView.setBackgroundColor(Color.parseColor("#2ca0ea"));
        } else if (position%4 == 2){
            holder.textView.setBackgroundColor(Color.parseColor("#2cc4ea"));
        } else if (position%4 == 3){
            holder.textView.setBackgroundColor(Color.parseColor("#2ceae3"));
        }
        return convertView;
    }

ViewHolder Class:

    class ViewHolder{
        public TextView textView;
    }

adapter custom layout :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:padding="15dp"
    android:textColor="@color/white"
    android:textSize="20sp"
    android:textStyle="bold"/>
</LinearLayout>

Answered By - Rathiga Jesika
Answer Checked By - Katrina (JavaFixing Volunteer)