Setting custom format for numbers in TextView [duplicate]

问题

Possible Duplicate:
How do I format a number in java?
String.format() to format double in java

I want to be able to take the output from a double variable (called double) and put it in a TextView along with some String text (called outputPref, which just contains "cubic mm") like below

displayAnswer.setText(volume + " " + outputPref);

This works fine, however, the number shows in the TextView as the full double (with many, many decimal places). I want the number to show with comma's splitting the thousands (if there are any) with one decimal place, like the Excel number format "(* #,##0.0);(* (#,##0.0);(* "-"??);(@_)", or put simply (given I won't have any negative numbers) "#,##0.0"

What is the function I should use to reconfigure the volume double variable before applying it to the TextView?

回答1:

String.format("%1$,.2f", myDouble);

回答2:

Use this

NumberFormat format = NumberFormat.getInstance();
        format.setMaximumFractionDigits(1);
displayAnswer.setText(format.format(volume)+ " "+outputPref);

回答3:

You could round the double number for showing it in the TextView:

double roundTwoDecimals(double d) {
            DecimalFormat twoDForm = new DecimalFormat("#.##");
        return Double.valueOf(twoDForm.format(d));
}

回答4:

You can set the decimal places with:

DecimalFormat df = new DecimalFormat("#.#");

This will give one decimal place after the whole number, as there is one # symbol after the decimal place.

Then do:

df.format(yourDoubleHere);

回答5:

I hope it will help you

rountdoubel=Maths.round(outputPref)

displayAnswer.setText(volume + " " + rountdoubel);

来源：https://stackoverflow.com/questions/12783015/setting-custom-format-for-numbers-in-textview

标签

java

android

format

comma

settext