I am making a calculator app where I want to change the sign of no. by clicking a button.
buttonplusminus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(edittext==null){
edittext.setText("");
}
else {
Value1=Float.parseFloat(edittext.getText()+ "");
if (Value1<0){
}
}
}
});
Just multiply the number with -1 to reverse the symbol and set it again to edit text
buttonplusminus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(edittext.getText()==null){
edittext.setText("");
}
else {
value1=Float.parseFloat(edittext.getText());
value1*=-1
edittext.setText(String.valueOf(value1))
}
}
});