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Added in API level 11

public static interface NumberPicker.OnValueChangeListener

android.widget.NumberPicker.OnValueChangeListener

接口监听当前值的变化。

Public methods
`abstract void`	`onValueChange(NumberPicker picker, int oldVal, int newVal)` 在改变当前值时调用。

Added in API level 11

void onValueChange (NumberPicker picker, 
                int oldVal, 
                int newVal)

在改变当前值时调用。

Parameters
`picker`	`NumberPicker`: The NumberPicker associated with this listener.
`oldVal`	`int`: The previous value.
`newVal`	`int`: The new value.