如何在Android中的NumberPicker中自定义数字的值? [英] How to customize value for numbers in NumberPicker in android?

问题描述

我有一个数字选择器，用于设置以MB为单位的数据限制.现在，我有numberPicker，它包含按顺序排列的数字值，例如[1,2,3，.....，2000 MB].

I have a number picker for setting a data limit in MB. right now, I have numberPicker, contains numeric values in sequence like [1,2,3,....., 2000 MB].

但是我想要一个数字选择器，其中应该包含[100,200,300，....，2000MB]之类的数值. 我该怎么办?

But I want a numberPicker that should contain numeric values like [100,200,300,...., 2000MB]. How can I do this?

推荐答案

为选择器显示的数组值

int NUMBER_OF_VALUES = 20; //num of values in the picker
int PICKER_RANGE = 100;
...
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 = {"100", "200", "300", .....}; */

在选择器中设置arr:

Set arr in your picker :

numPicker.setMinValue(0); 
numPicker.setMaxValue(displayedValues.size()-1);
numPicker.setDisplayedValues(displayedValues);

获取/设置选择器的值:

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("300") )
         numPicker.setValue(i);

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