How to display or print fixed number of decimal points of float data in textView of Android App?

In this video it shows how to limit the number of decimal points of a float or decimal while printing it on a textView widget of Android App. It basically uses below line of code to limit the decimal places.

Complete source code and other details/ steps of this video are posted in the below link:

However, the main Java code is copied below also for reference:

public class MainActivity extends AppCompatActivity {
private Float aFloatNumber = .621478f;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {

return insets;
});
}

public void buttonFixDecimalPoints(View view){
}
}

--