So, I solved it. I have problem with manifest.xml. When I don't use
android:targetSdkVersion="4" it resize for example QVGA from 240x320
to 320x427 and WVGA from 480x800 to 320x533. When I use
android:targetSdkVersion="4" everithing works good and
Display display = ((WindowManager) getSystemService
(Context.WINDOW_SERVICE)).getDefaultDisplay();
display.getWidth();
display.getHeight();

return me correct absolute size of the physical screen. QWGA 240x320
like in Table 1 on 
http://d.android.com/guide/practices/screens_support.html#range

Now I need density too, so I use

DisplayMetrics metrics = new DisplayMetrics();
                 getWindowManager().getDefaultDisplay().getMetrics(metrics);
                 metrics.densityDpi;

it returns 120, 160 and 240 int number.
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