CODEWITHSUNDEEP
javaandroiddrawable
Speedy
Speedy

Reputation: 23

How do I change the background of an element to a different drawable?

I want to make a textView that turns green with a positive number, red with a negative number, and goes invisible when 0. I have two separate drawables for each background.

I have changed updateView.setDrawable(@Drawable/add_background) to updateView.setDrawable(R.drawable.add_background), and am now getting the error 'setBackground(android.graphics.drawable.Drawable)' in 'android.view.View' cannot be applied to '(int)'

Here is the code:

Integer team1UpdateAmount = 0;


TextView updateView = findViewById(R.id.team1UpdateView);
    if (team1UpdateAmount == 0) {updateView.setVisibility(View.INVISIBLE); return;}

    updateView.setVisibility(View.VISIBLE);

    if (team1UpdateAmount > 0) {
        updateView.setText("+" + team1UpdateAmount);
        updateView.setBackground(R.drawable.add_background);
    }
    if (team1UpdateAmount < 0) {
        updateView.setText("" + team1UpdateAmount);
        updateView.setBackground(R.drawable.sub_background);
    }

Upvotes: 0

Views: 50

Answers (2)

snachmsm
snachmsm

Reputation: 19253

check out this line

updateView.setBackgroundResource(R.drawable.sub_background)

thats how you are referencing to resources in code, referencing by @ is for XMLs

Upvotes: 1

Speedy
Speedy

Reputation: 23

While experimenting, I found the answer.

I set getResources().getDrawable(R.drawable.add_background) to a variable called addBackground (same with sub), and referred to that variable in updateView.setBackground(addBackground)

The code now looks like this:

Drawable addBackground = getResources().getDrawable(R.drawable.add_background);
Drawable subBackground = getResources().getDrawable(R.drawable.sub_background);
TextView updateView = findViewById(R.id.Team1UpdateView);

if (team1UpdateAmount == 0) {updateView.setVisibility(View.INVISIBLE); return;}


        updateView.setVisibility(View.VISIBLE);

        if (team1UpdateAmount > 0) {
            updateView.setText("+" + team1UpdateAmount);
            updateView.setBackground(addBackground);
        }
        if (team1UpdateAmount < 0) {
            updateView.setText("" + team1UpdateAmount);
            updateView.setBackground(subBackground);
        }

Upvotes: 0

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