Adam Matan Adam Matan - 1 month ago 14
Android Question

Android NumberPicker: Set min, max, default from XML

Is there a way to set the minimum, maximum and default values of a NumberPicker from the XML Layout?

I'm doing it from within the Activity code:

np = (NumberPicker) findViewById(R.id.np);
np.setMaxValue(120);
np.setMinValue(0);
np.setValue(30);


XML is obviously more appropriate , because it defines property, not behaviour.

Is there a way to set these using the XML layout?

Answer

I had the same problem, this is how I solved it (according to the comment of MKJParekh):

  1. I created my own NumberPicker-Class

    package com.exaple.project;
    
    import android.annotation.TargetApi;
    import android.content.Context;
    import android.os.Build;
    import android.util.AttributeSet;
    import android.widget.NumberPicker;
    
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)//For backward-compability
    public class MyNumberPicker extends NumberPicker {
    
        public MyNumberPicker(Context context) {
            super(context);
        }
    
        public MyNumberPicker(Context context, AttributeSet attrs) {
            super(context, attrs);
            processAttributeSet(attrs);
        }
    
        public MyNumberPicker(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            processAttributeSet(attrs);
        }
        private void processAttributeSet(AttributeSet attrs) {
            //This method reads the parameters given in the xml file and sets the properties according to it
            this.setMinValue(attrs.getAttributeIntValue(null, "min", 0));
            this.setMaxValue(attrs.getAttributeIntValue(null, "max", 0));
        }
    }
    
  2. Now you can use this NumberPicker in your xml layout file

    <com.exaple.project.myNumberPicker
        android:id="@+id/numberPicker1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical"
        max="100"
        min="1" />
    

Thanks to MKJParekh for his useful comment