wrap_content is not working in button height android

Question

"wrap_content" is not working in my button, it currently looks like this:

 now                        want
 ____________
|            |           _____________
|   aaaaaa   |     =>   | aaaaaaaaaaa |
|____________|           -------------

and the xml for my buttons :

 <Button 
     android:layout_gravity="center"
     android:id="@+id/input_expend"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"                               
     android:textSize="12sp"
     android:text="aaaaaaa"                         
     android:background="@drawable/btn_01"/>
 <Button 
     android:layout_gravity="center"
     android:id="@+id/input_expend"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"                               
     android:textSize="12sp"
     android:text="aaaaaaa"                         
     android:background="@drawable/btn_02"/> 

How can I solve this problem? Thanks!

Answer 1

Button is a View and the android:minHeight attribute is set 48dip default. You can set minHeight lower than your actual text 'aaaaa' such as 1dp. Then wrap_content will work. But I don't think this is recommended.

Answer 2

One solution is to add android:padding="@null" to the button in your XML. This will override any existing padding being enforced.

There is also an issue I've come across where a button will not shrink smaller than the padding defined in the default button style. I highlighted this in my own question some time ago but haven't had an answer that resolves it yet.

Answer 3

Changing the background didn't work, as well as padding="@null".

I ended up using a TextView because my button was simple enough for it to suffice:

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Join"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:padding="5dp"
        android:textSize="@dimen/xsmall_text_size"
        android:textColor="@drawable/button_text_selector"
        android:background="@color/turquoise"
        android:textStyle="bold"
        android:onClick="buttonOnClick"
        android:clickable="true"/>