I have two approaches to get real resolution:
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
device_value[index++] = dm.widthPixels + "x" + m.heightPixels;
Display display = getWindowManager().getDefaultDisplay();
String widthAndHeight = display.getWidth() + " x " + display.getHeight();
<uses-sdk android:minSdkVersion="3" android:targetSdkVersion="3"/>
<supports-screens android:anyDensity="false" android:smallScreens="true" android:normalScreens="true" android:largeScreens="true"/>
Both of them return "320x569" while the real one is "640x960".