DisplayUtils

DisplayUtils.java

import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.util.DisplayMetrics;

public class DisplayUtils {

    private static DisplayUtils instance;

    public static DisplayUtils getInstance() {
        if (instance == null) {
            instance = new DisplayUtils();
        }
        return instance;
    }

    public float dpToPx(int dp, Context context) {
        return dp * (context.getResources().getDisplayMetrics().density);
    }

    public int getStatusBarHeight(Context context) {
        int result = 0;
        int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            result = context.getResources().getDimensionPixelSize(resourceId);
        }
        return result;
    }

    public int getNavigationBarHeight(Context context) {
        int result = 0;
        int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            result = context.getResources().getDimensionPixelSize(resourceId);
        }
        return result;
    }

    public int getSoftButtonsBarHeight(Activity activity) {
        // getRealMetrics is only available with API 17 and +
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            DisplayMetrics metrics = new DisplayMetrics();
            activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
            int usableHeight = metrics.heightPixels;
            activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
            int realHeight = metrics.heightPixels;
            if (realHeight > usableHeight)
                return realHeight - usableHeight;
            else
                return 0;
        }
        return 0;
    }
}

gistfile1.txt

// status bar height
        int statusBarHeight = 0;
        int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            statusBarHeight = getResources().getDimensionPixelSize(resourceId);
        }

        // action bar height
        int actionBarHeight = 0;
        final TypedArray styledAttributes = getActivity().getTheme().obtainStyledAttributes(
            new int[] { android.R.attr.actionBarSize }
        );
        actionBarHeight = (int) styledAttributes.getDimension(0, 0);
        styledAttributes.recycle();

        // navigation bar height
        int navigationBarHeight = 0;
        int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            navigationBarHeight = resources.getDimensionPixelSize(resourceId);
        }