計算全屏幕/狀態欄/導航欄的高度工具類

import android.content.Context;
import android.content.res.Resources;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
import java.lang.reflect.Method;

public class UnitUtils {

    /**
     * 獲取屏幕原始尺寸高度，包括虛擬按鍵NavigationBar
     * @param context
     * @return
     */
    public static int getFullScreenHeight(Context context) {
        int dpi = 0;
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        @SuppressWarnings("rawtypes")
        Class c;
        try {
            c = Class.forName("android.view.Display");
            @SuppressWarnings("unchecked")
            Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
            method.invoke(display, displayMetrics);
            dpi = displayMetrics.heightPixels;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dpi;
    }

    /**
     * 獲取狀態欄高度
     *
     * @return
     */
    public static 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;
    }

    /**
     * 獲得顯示屏幕高度，不包括虛擬按鍵NavigationBar
     *
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    /**
     * 計算NavigationBar的高度
     * @param context
     * @return
     */
    public static int getNavigationBarHeight(Context context) {
        int navigationBarHeight = 0;
        Resources rs = context.getResources();
        int id = rs.getIdentifier("navigation_bar_height", "dimen", "android");
        if (id > 0 && checkDeviceHasNavigationBar(context)) {
            navigationBarHeight = rs.getDimensionPixelSize(id);
        }
        return navigationBarHeight;
    }

    /**
     * 判斷是否存在虛擬的NavigationBar
     * @param context
     * @return
     */
    public static boolean checkDeviceHasNavigationBar(Context context) {
        boolean hasNavigationBar = false;
        Resources rs = context.getResources();
        int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");
        if (id > 0) {
            hasNavigationBar = rs.getBoolean(id);
        }
        try {
            Class systemPropertiesClass = Class.forName("android.os.SystemProperties");
            Method m = systemPropertiesClass.getMethod("get", String.class);
            String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");
            if ("1".equals(navBarOverride)) {
                hasNavigationBar = false;
            } else if ("0".equals(navBarOverride)) {
                hasNavigationBar = true;
            }
        } catch (Exception e) {
        }
        return hasNavigationBar;
    }


}