Trying to set background color of a cell(row/col) in GridView Android

Question

how do i set a custom color for a row/col in gridview in android?

My gridView consists of a gridArray of type Items which I pass all the data I want it to display, its for a timetable. I calculate the position of the items based on where I want them and then Display the items. I am not able to change the background color of the cell. How would I go about doing that.

for (int d1 = 0; d1 < days.size(); d1++) { if (myModules.get(1).equals(days.get(d1))) { for (int e1 = 0; e1 < times.size(); e1++) { if (startEndM1[0].equals(times.get(e1))) { gridArray.set(((e1 * 5) + d1),new Item(myModules.get(0))); if (!startEndM1[1].equals(times.get(e1 + 1))) { gridArray.set((((e1 * 5) + d1) + 5), new Item(myModules.get(0))); } int position = ((e1 * 5) + d1); ((View) gridView.getItemAtPosition(position)).setBackgroundColor(Color.BLUE); } } } }

the above code is justto set an item onto its specified position, If I have to change the color of that particular backgorund cell where I am setting the item, it crashes. The Grid view should recognize the position of the item where its at. Some help would be really apprectiated, thanks.

whats the solution u found? please let us know

Syed Md. Kamruzzaman
– Syed Md. Kamruzzaman

2015-12-15 13:21:06 +00:00
Commented Dec 15, 2015 at 13:21 — Syed Md. Kamruzzaman
– Syed Md. Kamruzzaman, Commented Dec 15, 2015 at 13:21

Community · Accepted Answer · 2017-05-23 12:23:17Z

3

ok first of all, i made a crossword game and also had to change background color of cell ... i made it this way

View tv = (View) gridView.getChildAt(i); tv.setBackgroundColor(Color.RED);

also anothers links that helped me a lot were :

Change Color of cell of grid

http://eureka.ykyuen.info/2010/03/15/android-%E2%80%93-applying-alternate-row-color-in-listview-with-simpleadapter/

edited May 23, 2017 at 12:23

CommunityBot

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answered Mar 31, 2014 at 16:48

Matej Špilár

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6 Comments

sponturious Over a year ago

It gives me a null pointer exception if I try to do that, I don't get it, It doesn't seem to find anything at that position or any position for that matter.

sponturious Over a year ago

That is not possible because isn't the size of the gridView supposed to be set accordingly when i define the customadapter customGridAdapter = new CustomGridViewAdapter(this, R.layout.row_grid, gridArray); so it should automatically get the gridArray size.? no?

Matej Špilár Over a year ago

yes it is ... but make sure and you logcat to make sure that "i" is below gridArray size ... also try to change color in getView method of your custom adapter ...

sponturious Over a year ago

Its fine thanks, I figured out another way of doing it, Cheers. I made a separate data Structure to facilitate my problem.

KinGPinG Over a year ago

Could you please post the solution you found?

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