如何获得Android的System Bar’s Height

package com.sample.layouttest;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnLayoutChangeListener;

public class Main extends Activity implements OnLayoutChangeListener {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View newView = getLayoutInflater().inflate(R.layout.main, null);
    newView.addOnLayoutChangeListener(this);
    setContentView(newView);
    }

    @Override
    public void onLayoutChange(View view, int left, int top, int right,
            int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
        Log.d("LayoutTest","left="+left+", top="+top+", right="+right+", bottom="+bottom);
    }
}

On a Motorola Xoom running Android 3.1 (as well as a Samsung Galaxy 10.1V running 3.0), the output from the onLayoutChange method when entering portrait mode is :

05-24 15:11:43.047: DEBUG/LayoutTest(8658): left=0, top=0, right=800, bottom=1232

and when entering landscape :

05-24 15:13:18.837: DEBUG/LayoutTest(8658): left=0, top=0, right=1280, bottom=752