I'm having some trouble about visualization of items.On android 2.x xml fill the screen but in 4.x they cover about 50% of the screen and the other 50% it's all black. I think using fill_parent and wrap_content help me!How i can standardize it ? Here's the source\[code\] <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" androidrientation="vertical" android:background="#0058A8" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#0058A8" > <EditText android:id="@+id/smsnumber" android:layout_width="154dp" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="14dp" android:layout_toLeftOf="@+id/btnRubrica" android:ems="10" android:inputType="phone" > </EditText> <Button android:id="@+id/btnRubrica" android:layout_width="119dp" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:text="@string/phone_book" /></RelativeLayout> <EditText android:id="@+id/smstext" android:layout_width="fill_parent" android:layout_height="64dp" android:inputType="textMultiLine" /><DatePicker android:id="@+id/datePicker1" android:layout_width="fill_parent" android:layout_height="138dp" /> <TimePicker android:id="@+id/timePicker1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/start" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/start" /></LinearLayout>\[/code\]