Android ::自定义对话框，带数字可滚动选择器？

Question

PROBLEM

What we call this component in the red circle ??

and how can I make dialog that have it on like this.

actually I don't know what its called so I don't know keyword

to search about that. I'm sorry if it feel like weird question.

NOTE

I know how to create simple dialog in android anyway

Answer 1

Imagine you want to have a NumberPicker that displays degree values from 0C to 20C.

You have to set a String array to populate your NumberPicker.

First, initialize your String [] with your values, like this:

    String [] degreesValues = new String [20];

    for(int i= 0;i<20;i++){
        degreesValues[i] = String.valueOf(i)+ (char) 0x00B0;
    }

Then, just apply that array on your NumberPicker , like this:

NumberPicker picker = (NumberPicker) findViewById(R.id.numberPicker);
    picker.setMinValue(0);
    picker.setMaxValue(19);
    picker.setDisplayedValues(degreesValues);