Multiple Screen Support
<p>I have some problem with multiple screen support, I work with dp(dpi) for specify the layout_heigth and layout_width and I hope that is the better way to support multiple screen, but when I tried with two smartphone I meet two different result.</p>

<p>I give an example, this is a layout I use:</p>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/cities_main_layout"
          android:orientation="vertical"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"&gt;

       &lt;ListView
          android:id="@+id/citieslist"
          android:layout_width="wrap_content" 
          android:layout_height="320dip"
          android:layout_gravity="center_vertical"
          android:layout_below="@id/cities_main_layout"
       /&gt;

       &lt;LinearLayout 
          android:id="@+id/cities_button_layout"
          android:orientation="horizontal"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_below="@id/citieslist"
          android:layout_gravity="center_vertical"&gt;   
        &lt;Button 
           android:id="@+id/bycountry"
           android:layout_height="50dip"
           android:layout_width="105dip"
           android:background="@drawable/buttonmarket"
           android:text="@string/button_bycountry"
          /&gt;
        &lt;Button 
           android:id="@+id/top10"
           android:layout_height="50dip"
           android:layout_width="105dip"
           android:background="@drawable/buttonmarket"
           android:text="@string/button_top10"
          /&gt;
        &lt;Button 
           android:id="@+id/recommended"
           android:layout_height="50dip"
           android:layout_width="105dip"
           android:background="@drawable/buttonmarket"
           android:text="@string/button_recommended"
          /&gt;

       &lt;/LinearLayout&gt;

    &lt;/RelativeLayout&gt;
</code></pre>

<p>The button are at the bottom of the layout, and I see two different result:</p>

<p><img src="http://img600.imageshack.us/img600/5513/htcmagicg2.png" alt="http://img600.imageshack.us/img600/5513/htcmagicg2.png"></p>

<p><img src="http://img441.imageshack.us/img441/6440/samsunggalaxys.png" alt="http://img441.imageshack.us/img441/6440/samsunggalaxys.png"></p>

<p>In the last smartphone I can see the buttons, instead in the first I cannot...what's wrong?</p>

<p>I have to write a layout for any set of screen??!!!</p>
