In Android, how to create EditText of fixed width?

I would like to create an EditText which accepts only numbers, has a maximum of 4 numbers, and is never narrower than it would be if filled with 4 numbers (does not shrink when empty, or have to expand to accommodate 4 numbers, so it's fixed.)

The first 2 are accomplished with: android:inputType="number" and android:maxLength="4".

How can I set the minimum length?

One rarely-used (AFAIK) attribute of an EditText that you can use is:

android:ems="4"

This makes the EditText exactly 4 ems wide. An em width is the width of the widest (M) character in the selected font.

A little hackish, but you can put your EditText inside a FrameLayout alongside with another TextView with text="0000" and visibility=invisible.

FrameLayout Should have width=wrap_content and your EditText will have width=match_parent.
That should make it the right width always.

The advantage of this is, it's 100% xml-side, no code involved.

<FrameLayout
 android:layout_width="wrap_content"
 android:layout_height="wrap_content">

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="0000"
    android:visibility="invisible" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="number"
    android:maxLength="4" />
</FrameLayout>

In my situation, I needed the view to be 6 digits wide. android:ems made the field too wide (since the M-character is wider than a digit).

I ended up using a transparent hint which dictates the minimum width of the field. The example below is six digits wide.

<EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="000000"
        android:textColorHint="#00FFFFFF"
        android:maxLength="6"
        android:inputType="numberPassword" />

This solution is independent of font, letter spacing and other things which may vary. The textColorHint is a 0% opaque white color, so the hint should never be visible to the user.

You can also try using. . .

android:ems="4"
android:maxEms="4"
android:layout_width="wrap_content"

. . . this should insure the tightest fit possibly allowed by the default android edittext style

For additional control with the padding on both left and right you can use

android:background="#ffffff"
android:paddingLeft="0dp"
android:paddingRight="0dp"

Use android:width="XXX.Xdp"

This lets you set the width in density pixels which ought to be relative to the screen density. I tried using ems based for a field 2 chars wide, but since ems requires a int, 2 was too small and 3 was too big. Blech.