user interface - Is there a view for inputing integers in Android?

Question

I'm looking for something like the individual parts of the date picker dialog. A view that allows you to input integers (and only integers) that you can limit (between 1 and 10 for example), where you can use the keyboard or the arrows in the view itself. Does it exists?

It is for a dialog. A ready-made dialog to request an integer would also help.

Answer 1

The NumberPicker widget is probably what you want. Unfortunately it's located in com.android.internal.Widget.NumberPicker which we cannot get to through normal means.

There are two ways to use it:

1. Copy the code from android source
2. Use reflection to access the widget

Here's the xml for using it in a layout:

<com.android.internal.widget.NumberPicker
    android:id="@+id/picker"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

Here's the reflection to set the NumberPicker settings (I have not tested this):

Object o = findViewById(R.id.picker);
Class c = o.getClass();
try 
{
    Method m = c.getMethod("setRange", int.class, int.class);
    m.invoke(o, 0, 9);
} 
catch (Exception e) 
{
    Log.e("", e.getMessage());
}

Since it's an internal widget and not in the SDK, future compatibility could be broken if you use reflection. It would be safest to roll your own from the source.

The original source for this information is shared in this Google Group.