设置NumberPicker的增加/减少间隔

Question

是否可以将NumberPicker的增加/减少间隔设置为其他值？例如50(50,100,150,200,250等)？或者它需要一些定制/黑客？

Answer 1

我想你可以这样做:

• 初始化选择器的显示数组值:

  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", .....}; */
  

• 将显示的数组设置为选择器:

  /* 
  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);
  

• 当您想获取/设置选择器的值时:

  //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);
  

最后,有一个很容易定制的小部件叫做android-wheel.如果您愿意,可以查看并使用它.