how do i format number parsed and passed to editText?

Question

I am having an issue formatting numbers in an editText. I want users to be able to enter a number as either an positive or negative integer (5 or -5) and for it to format a as decimal (.05). Currently, it is formatting as .05.0 instead .05 and i can't figure out why. Also if the user enters erroneous text or leaves the field blank i want to set the editText to "0". However, I get an error instead. Any help greatly appreciated.

public void checkPremium(){
     double number = Double.parseDouble(premium.getText().toString());
     if(premium.getText().toString().equals(".")||premium.getText().toString().equals("-.")||premium.getText().toString().equals("")){
         premium.setText("0");
     }else if(number >= 1 || number < 10){
         premium.setText(".0"+number);
     }else if(number >= 10){
         premium.setText("."+number);
     }else if(number <= -1 || number > -10){
         premium.setText(".0"+Math.abs(number));
     }else if(number <= -10){
         premium.setText("."+Math.abs(number));
     }else if(number <1 || number >0){
           //Do Nothing
         }       
 }

score 1 · Accepted Answer · answered Jul 24 '12 at 06:29

1

The Double parser adds ".0" to your number. you better add your String and not your parsed double.

answered Jul 24 '12 at 06:29

cosmincalistru

1,193
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Also you might want to change the || into && in your 2nd and 4th conditions – cosmincalistru Jul 24 '12 at 06:33

score 0 · Answer 2 · edited May 23 '17 at 12:13

0

Use Decimal Formatter or string specifiers. check following answer.: How to print a double with two decimals in Android?

edited May 23 '17 at 12:13

Community

1
1

answered Jul 24 '12 at 06:32

jeet

27,861
6
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score 0 · Answer 3 · answered Jul 24 '12 at 07:44

0

Simpler code would be:

Double number = Double.parseDouble(premium.getText().toString());
if (number.isInfinite() || number.isNan()) number = 0F;
premium.setText(String.format("%.2f", Math.abs(number)/100);

Hope this helps...

answered Jul 24 '12 at 07:44

Aviral

1,131
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score 0 · Answer 4 · answered Jul 24 '12 at 07:55

It's better to use try and catch blocks if you don't want any other erroneous characters or empty spaces in the edittext field

Here is the code and hope you will find it useful.

          try{
                 number = Double.parseDouble(premium.getText().toString());

                 if(number >= 1 || number < 10){
                     premium.setText(String.valueOf(.01*number));
                 }else if(number >= 10){
                     premium.setText(String.valueOf(.1*number));
                 }else if(number <= -1 || number > -10){
                     premium.setText(String.valueOf(0.01*Math.abs(number)));
                 }else if(number <= -10){
                     premium.setText(String.valueOf(0.1*Math.abs(number)));
                 }else if(number <1 || number >0){
                       //Do Nothing
                 }

             }catch(Exception e)
             {
                 premium.setText("0");
             }

how do i format number parsed and passed to editText?

4 Answers4