Changing a positive value to a negative one

In Android how can I change a value to a negative number?

If I have the following code and have entered 10 for pos1_deg, how can I easily change this to -10 using a radio button? Is the answer to concatenate a string such as pos1_deg = "-" + pos1_deg? Or is there some mathematical command I can use?

pos1_deg =(EditText)findViewById(R.id.sat1posdeg);
pos1_deg.setInputType(InputType.TYPE_CLASS_NUMBER|InputType.TYPE_NUMBER_FLAG_DECIMAL);
开发者_Python百科

Many thanks for any help

As the others suggested you can use that way to convert a positive to a negative but what if you have a negative instead of a positive(i don't know your requirement) so better use :

Math.abs(pos1_deg) and use any of above techniques e.g

Math.abs(po1_deg) * -1
0 - Math.abs(pos1_deg)

so you won't get any error calculations...

Multiply pos1_deg by -1:

pos1_deg * -1

Just subtract from zero to invert the sign.

0 - pos1_deg

public void onProgressChanged(SeekBar seekBar, int progress1,

        boolean fromUser)
{
    {
        // TODO Auto-generated method stub
        value2.setText("Right Contact:"+B);
        value3.setText("Delta:"+(A-B));
        B = -1*progress1 ;

}

answer

from api 24 you can use

Math.negateExact(pos1_deg)

pos1_deg is your int