BUTTON LAYOUT

Question

In my Xamarin.Android project I have a row of buttons such as:

    <LinearLayout  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:id="@+id/keyb_row2"  
        android:orientation="horizontal"  
        >  
        <Button  
            android:text="UD"  
            style="@style/text3Button"  
            />  
        <Button  
            android:text="Z"  
            style="@style/textButton"  
            />  
        <Button  
            android:text="X"  
            style="@style/textButton"  
            />  
        <Button  
            android:text="C"  
            style="@style/textButton"  
            />  
           ....  
    </LinearLayout>  

With styles defined as:

   <style name="textButtonBase">  
       <item name="android:layout_height">44dp</item>  
       <item name="android:layout_marginLeft">1dp</item>  
       <item name="android:layout_marginRight">1dp</item>  
       <item name="android:layout_marginTop">2dp</item>  
       <item name="android:layout_marginBottom">2dp</item>  
       <item name="android:textAllCaps">false</item>  
       <item name="android:background">@drawable/rounded_corners</item>  
     </style>  
     <style name="textButton" parent="textButtonBase">  
       <item name="android:layout_width">34dp</item>  
       <item name="android:textSize">20sp</item>  
     </style>  
     <style name="text3Button" parent="textButtonBase">  
       <item name="android:layout_width">52dp</item>  
       <item name="android:textSize">16sp</item>  
     </style>  

It happens that for all the buttons I get the error message: "Missing attribute: layout_height" (where in fact height is defined in style textButtonBase); however, the program compiles and runs successfully.

However, the most important issue is that the button 'UD' displays dropped down:

I can align the button by overriding marginTop=0: granted that this trick works, I would like to understand the reason for this strange behavior.

Answer 1

Hello,

I get the error message: "Missing attribute: layout_height"

VS cannot detect attributes in styles

the most important issue is that the button 'UD' displays dropped down:

Based on my test, android:textSize caused this issue, if you set the same textsize and use dp for textsize, the button 'UD' will not displays dropped down:

   <style name="textButton" parent="textButtonBase">  
           <item name="android:layout_width">34dp</item>  
           <item name="android:textSize">20dp</item>  
       </style>  
         
       <style name="text3Button" parent="textButtonBase">  
           <item name="android:layout_width">54dp</item>  
           <item name="android:textSize">20dp</item>  
       </style>  

Best Regards,

Leon Lu

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