Set Linear background layout from String variable

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I have a function that takes a number (in the String format) as a parameter and checks if it is between the numbers 1 to 5. Here is the function:

if (fundo.equals("1") || fundo.equals("2") || fundo.equals("3") || fundo.equals("4") || fundo.equals("5"))
{
    fundo = "bg_" + fundo;
    fundoTopo.setBackground(R.drawable. <-- Queria colocar a variavel aqui);
}

But this generates an error because the received format is String, and the required format is Drawable, how to solve this?

android background drawable

1 answer

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It is possible to obtain the id of a drawable thus: 

int id = context.getResources()
                .getIdentifier(fundo, "drawable", context.getPackageName());

Obtained the id use setBackgroundResource(): 

fundoTopo.setBackgroundResource(id);

Everything together will be like this: 

if (fundo.equals("1") || fundo.equals("2") || fundo.equals("3") || fundo.equals("4") || fundo.equals("5"))
{
    fundo = "bg_" + fundo;
    int id = context.getResources()
                    .getIdentifier(fundo, "drawable", context.getPackageName()); 
    fundoTopo.setBackgroundResource(id);
}

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