My main activity has a RelativeLayout that includes some TextViews.
The vertical position is determined by things like this in the XML:
<TextView android:id="@+id/name"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignParentTop="true"
android:textSize="18sp" android:textColor="#000000" ></
TextView>
<TextView android:id="@+id/frequency"
android:layout_below="@id/name"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignParentLeft="true"
android:textSize="18sp" android:textColor="#000000"></
TextView>
As you can see, the vertical positioning of id/frequency is to be
directly below id/name. At various times the app sets different
strings as the text of these TextViews. Sometimes the top TextView is
supposed to be blank. I do that by setting:
nameTV.setText(nameString); //..where nameString happens to be
"" (zero length)
And I expect that after such a setting, the RelativeLayout will
continue to hold a 18sp vertical space for the blanked TextView, so
that the second TextView appears in its proper place regardless. And
indeed this is exactly what happens on the emulator and on a Motorola
Droid and on two different Chinese-brand tablets. The app is compiled
use API 8 for Android 2.2. But on a Acer A100 tablet running Android
3.2, this is not what happens. Instead a TextView with a zero-length
text takes up no room at all and the second TextView slides up to
where the first TextView would have been. I know I could probably fix
the problem by setText(" ") instead of setText(""), but there are
various reasons in my app that would make that a messy solution. Can
anyone confirm or explain this layout behavior?
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