How to limit a float to give one or no value after the decimal - eclipse

Question

I'm working in Eclipse and using float for my variables and values. The only issue I am getting is the huge number of digits (1.563524354) after the decimal. Can I somehow limit them to one digit after the decimal like (1.5) or no digit or decimal at all simply like 1. ?
My code:
float nCurrentSpeed;
private long startTime;
private int count;
private int pointAverage;
private Float nMaxSpeed = 0F;
DecimalFormat df = new DecimalFormat("#");
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LocationManager lm = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
this.onLocationChanged(null);
}
#Override
public void onLocationChanged(Location location) {
TextView tv = (TextView) findViewById(R.id.textView1);
TextView tvd = (TextView) findViewById(R.id.textView5);
if (location == null) {
startTime = System.currentTimeMillis();
count = 0;
pointAverage = 0;
actualizeTextField();
tv.setText("0.0");
} else {
nCurrentSpeed = location.getSpeed();
tv.setText(nCurrentSpeed + "");
count += 1;
pointAverage += location.getSpeed();
actualizeTextField();
if (nMaxSpeed < nCurrentSpeed) {
nMaxSpeed = nCurrentSpeed;
}
}
tvd.setText(nMaxSpeed.toString());
}
private void actualizeTextField() {
// TODO Auto-generated method stub
TextView tf = (TextView) findViewById(R.id.textView3);
if (count > 0) {
long timeOver = System.currentTimeMillis() - startTime;
tf.setText(String.valueOf(pointAverage / (timeOver / 1000)));
} else {
tf.setText("0.0");
}
}

Answer 1

DecimalFormat df = new DecimalFormat("#.#");
df.format(0.91231);
returns:
0.9
If you don't want decimal places, why don't you cast it to int then?

Answer 2

Like this :
double d = 1.234567;
DecimalFormat df1 = new DecimalFormat("#.##"); // set your format
System.out.print(df1.format(d))

Answer 3

If you don't need point values, why are you using float? Check this one.
float nCurrentSpeed;
private long startTime;
private int count;
private int pointAverage;
private int nMaxSpeed = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LocationManager lm = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
this.onLocationChanged(null);
}
#Override
public void onLocationChanged(Location location) {
TextView tv = (TextView) findViewById(R.id.textView1);
TextView tvd = (TextView) findViewById(R.id.textView5);
if (location == null) {
startTime = System.currentTimeMillis();
count = 0;
pointAverage = 0;
actualizeTextField();
tv.setText("0.0");
} else {
nCurrentSpeed = location.getSpeed();
tv.setText(nCurrentSpeed + "");
count += 1;
pointAverage += location.getSpeed();
actualizeTextField();
if (nMaxSpeed < nCurrentSpeed) {
nMaxSpeed = (int)nCurrentSpeed;
}
}
tvd.setText(String.valueOf(nMaxSpeed));
}
private void actualizeTextField() {
// TODO Auto-generated method stub
TextView tf = (TextView) findViewById(R.id.textView3);
if (count > 0) {
long timeOver = System.currentTimeMillis() - startTime;
tf.setText(String.valueOf(pointAverage / (timeOver / 1000)));
} else {
tf.setText("0.0");
}
}