Setting increase/decrease interval of NumberPicker

Question

Is it possible to set the increase/decrease interval of NumberPicker to other value? For instance to 50 (50, 100, 150, 200, 250 etc)? Or do it require some customization/hack?

Answer 1

I think you can do this:

• Initialise a displayed array values for your picker :

  int NUMBER_OF_VALUES = 10; //num of values in the picker
  int PICKER_RANGE = 50;
  ...
  String[] displayedValues  = new String[NUMBER_OF_VALUES];
  //Populate the array
  for(int i=0; i<NUMBER_OF_VALUES; i++)
      displayedValues[i] = String.valueOf(PICKER_RANGE * (i+1));
  /* OR: if the array is easy to be hard-coded, then just hard-code it:
     String[] displayedValues = {"50", "100", "150", .....}; */
  

• Set the displayed array to your picker :

  /* 
  NOTE: Your picker range has to be [0, displayedValues.size()-1] to be 
        consistent with the array index (displayedValues index).
  */
  //ToDo: Initialize the picker first.
  numPicker.setMinValue(0); 
  numPicker.setMaxValue(displayedValues.size()-1);
  numPicker.setDisplayedValues(displayedValues);
  

• When you want to get/set the value of the picker :

  //To get the current value in the picker
  choosenValue = displayedValues[numPicker.getValue()]; 
  //To set a new value (let's say 150)
  for( int i=0; i<displayedValues.length ; i++ )
      if( displayedValues[i].equals("150") )
           numPicker.setValue(i);
  

Finally, there is a great easy-to-customize widget called android-wheel. You can check it out and use it if you like.