Resize Android tablet app to android phone

Question

Im creating an app and im testing on a android tablet. Which means im using dimensions and positioning to fit the tablet screen. However as this app will be available for both tablet and phone im wondering is there a way of auto scaling for any device??

Thanks

Im using map fragment, rss feeds contained in listview and i have buttons.

im wondering if its complicated to scale down for a android phone?? or is it simple enough. Im currently testing on a tablet running 4.0.4 but app is compatible with newer and older android versions.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
     android:orientation="vertical"
    android:background="@color/white">

    <fragment
        android:id="@+id/map"
        android:layout_width="300dp"
        android:layout_height="413dp"
        android:layout_marginTop="5dp"
        android:layout_toRightOf="@+id/button5"
        class="com.google.android.gms.maps.MapFragment" />



    <Button
        android:id="@+id/button3"
        android:layout_width="305dp"
        android:layout_height="100dp"
        android:layout_marginLeft="34dp"
        android:layout_marginTop="10dp"
        android:onClick="ClickTourismButton"
        android:layout_below="@+id/map"
        android:text="Touism Guide" />
    <TextView
        android:id="@+id/button5"
        android:layout_width="34dp"
        android:textIsSelectable="true"
        android:layout_height="match_parent"
        android:background="@color/grey"
        />
    <TextView
        android:id="@+id/button6"
        android:layout_width="34dp"
        android:textIsSelectable="true"
        android:layout_alignParentRight="true" 
        android:layout_height="match_parent"
        android:background="@color/grey"
        />
    <Button
        android:id="@+id/button4"
        android:layout_width="305dp"
        android:layout_height="100dp"
       android:layout_marginLeft="34dp"
        android:layout_below="@+id/button3"
        android:text="Whats Nearby" />
    <Button
        android:id="@+id/button2"
        android:layout_width="305dp"
        android:layout_height="100dp"
        android:layout_marginLeft="34dp"
        android:layout_below="@+id/button4"
        android:text="Favouites" />
    <Button
        android:id="@+id/button1"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="304dp"
       android:layout_marginLeft="34dp"  
        android:layout_height="100dp"
        android:layout_below="@+id/button2"
        android:text="See Full Map" />   

    <TextView
        android:layout_width="260dp"
        android:layout_height="413dp"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="5dp"
        android:textIsSelectable="true"
        android:layout_toRightOf="@+id/map"
        android:layout_toLeftOf="@+id/button6"
        android:id="@+id/feedupdate1" />

    <ListView
        android:id="@android:id/list"
        android:background="@color/red"
        android:layout_toRightOf="@+id/map"
        android:layout_width="260dp"
         android:layout_marginTop="5dp"
        android:layout_marginLeft="10dp"
        android:layout_height="413dp" />

    <TextView
        android:id="@+id/empty"
        android:textIsSelectable="true"
        android:layout_width="260dp"
        android:layout_height="413dp"
        android:layout_marginLeft="10dp"
         android:layout_marginTop="5dp"
        />
    <TextView
        android:id="@+id/feedupdate"
        android:layout_width="260dp"
        android:layout_height="390dp"
        android:layout_marginLeft="6dp"
        android:layout_marginTop="430dp"
        android:textIsSelectable="true"
        android:layout_toRightOf="@+id/button3"
         />
    <ListView

        android:id="@+id/list1"
        android:background="@color/blue"
        android:layout_toRightOf="@+id/button3"
        android:layout_width="260dp"
        android:layout_marginTop="430dp"
        android:layout_marginLeft="6dp"
        android:layout_height="390dp" /> 




</RelativeLayout>

---

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:background="@color/white">

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

    <fragment
        android:id="@+id/map"
        android:layout_marginTop="5dp"
        android:layout_weight="1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        class="com.google.android.gms.maps.MapFragment"
         />

    <Button
        android:id="@+id/button3"
        android:layout_weight=".10"
        android:layout_marginLeft="34dp"
        android:layout_marginTop="10dp"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:onClick="ClickTourismButton"
        android:label="@string/Tourism" />

    <Button
        android:id="@+id/button4"
        android:layout_weight=".10"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginLeft="34dp"
        android:label="@string/Nearby" />
    <Button
        android:id="@+id/button2"
        android:layout_weight=".25"
        android:layout_marginLeft="34dp"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:label="@string/Favourites" />
    <Button
        android:id="@+id/button1"
        android:layout_weight=".25"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:layout_marginLeft="34dp"  
        android:label="@string/Map" />

    </LinearLayout>   


    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    <TextView

        android:layout_marginLeft="10dp"
        android:layout_marginTop="5dp"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:textIsSelectable="true"      
        android:id="@+id/feedupdate1" />

    <ListView
        android:id="@android:id/list"
        android:background="@color/red"
        android:layout_weight="1"       
        android:layout_marginTop="5dp"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginLeft="10dp"/>

    <TextView
        android:id="@+id/empty"
        android:textIsSelectable="true"   
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"  
        android:layout_marginLeft="10dp"
         android:layout_marginTop="5dp"/>
    <TextView
        android:id="@+id/feedupdate"        
        android:layout_marginLeft="6dp"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginTop="430dp"
        android:textIsSelectable="true"/>
    <ListView

        android:id="@+id/list1"
        android:background="@color/blue"
        android:layout_weight="1"
        android:layout_width="fill_parent"
            android:layout_height="fill_parent"
        android:layout_marginTop="430dp"
        android:layout_marginLeft="6dp" /> 

    </LinearLayout>
</LinearLayout>

Answer 1

I don't think you will have a problem as long as you are making use of fill_parent, wrap_content wherever possible. still do search "Android Compatibility Package" on developers.android.com

You will get a handful of info on that link.

Answer 2

It is better to use layout weight and weightsum property of the view wherever possible. It'll ensure that your views take up only that percentage of the screen space that you wish to specify. Thus, it'll scale your views for viewing in small or big screens.