Incorrect width and display height in Android

I have a screen size of 600 (width) x 1024 (height). I get the current width of 600, but get the height of 976 incorrectly (without turning the screen). I get the current width of 1024, but get the height of 552 incorrectly (with the screen rotated).

 int rowPixelWidth = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getWidth();
                int rowWidth =  (int)Math.floor(rowPixelWidth / this.getResources().getDisplayMetrics().density);
                int rowPixelheight = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getHeight();
                int rowheight =  (int)Math.floor(rowPixelheight / this.getResources().getDisplayMetrics().density);
                Log.d("rowWidth","rowWidth"+rowWidth);
                Log.d("rowheight","rowheight"+rowheight);
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 <uses-sdk
        android:minSdkVersion="3"
        android:targetSdkVersion="8" />
    <supports-screens android:anyDensity="true"/>
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What is wrong with this code?

Here are a few numbers for a typical screen width:

• 320dp: regular phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc.).
• 480dp: Tweener tablet such as Streak (480x800 mdpi).
• 600dp: 7-inch tablet (600x1024 mdpi).
• 720dp: 10-inch tablet (720x1280 mdpi, 800x1280 mdpi, etc.).

I get the current width but not get the current height for the whole device (without (screen 320x480).

I try the code from Get screen sizes in pixels , but this causes a problem.