Math.floor on a math calculation

Question

I have made an calculation, took of the decimals but now i would like to make so that it show a down rounded number. I found that i can use math.floor but i can't get it in the code. I took the decimals off but can't get it to round down.

code is like this (the part which does the math):

public void onClick(View view) {
    if (etBarfles.getText().toString().equals("")) {
        Toast.makeText(getActivity(), "Vul zowel bar in fles, inhoud fles als liters per " +
                "minuut in!", Toast.LENGTH_SHORT).show();
    } else {
        if (etInhoudfles.getText().toString().equals("")) {
            Toast.makeText(getActivity(), "Vul zowel bar in fles, inhoud fles als liters per " +
                    "minuut in!", Toast.LENGTH_SHORT).show();
        } else {
            if (etLitersperminuut.getText().toString().equals("")) {
                Toast.makeText(getActivity(), "Vul zowel bar in fles, inhoud fles als liters " +
                        "per minuut in!", Toast.LENGTH_SHORT).show();
            } else {
            }
            tvResult.setText(nodecimals((((Float.parseFloat(etBarfles.getText().toString()) *
                    (Float.parseFloat(etInhoudfles.getText().toString())) / (Float.parseFloat
                    (etLitersperminuut.getText().toString()))) / 60))));
        }
    }
}

private String nodecimals(float val) {
    return String.format("%.0f", val);
}

Answer 1

Try the following

tvResult.setText(String.valueOf((int) Math.floor(((Float.parseFloat(etBarfles.getText()
                .toString()) *
                (Float.parseFloat(etInhoudfles.getText().toString())) / (Float.parseFloat
                (etLitersperminuut.getText().toString()))) / 60))));

(int) Math.floor() will convert the value to an integer floor value, and then String.valueOf() will convert that int to String, so that you can set the same to the TextView.

THINGS TO IMPROVE:
You can make your code better by following these guidelines:

1. You are using the same line etBarfles.getText().toString() in multiple places for your check conditions. Its best if you initialize a variable with that value. Something like

   String etBarFilesText = etBarfles.getText().toString();

2. Your condition etBarfles.getText().toString().equals("") can be written the Android way as follows

   !TextUtils.isEmpty(etBarFilesText)

3. Your strings should be defined in your strings.xml. So if your error msgd is named error_string in the strings.xml then your Toast message will look something like this.

   Toast.makeText(getActivity(), getString(R.string.error_string), Toast.LENGTH_SHORT).show();

4. Your line

   tvResult.setText(nodecimals((((Float.parseFloat(etBarfles.getText().toString()) * (Float.parseFloat(etInhoudfles.getText().toString())) / (Float.parseFloat (etLitersperminuut.getText().toString()))) / 60)))); could have been wayy simpler, and more readable if you used different variables, instead of writing everything in a big single sentence.