setText fails to show a number as text in a TextView

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The problem is with lines like this

addAmount.setText(aAmt);

where aAmt is an int. This looks for a resource with the id of whatever aAmt is. You need to cast it to a String first like

addAmount.setText(String.valueOf(aAmt));

There are overloaded setText() methods. See the docs

This post goes into some more detail as to how this actually works

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