Android虛拟按鍵的判斷與适配

唉……，直接上代碼吧

/**
	 * 擷取是否存在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;
	}
           

/**
	 * 擷取虛拟功能鍵高度
	 * @param context
	 * @return
     */
	public static int getVirtualBarHeigh(Context context) {
		int vh = 0;
		WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
		Display display = windowManager.getDefaultDisplay();
		DisplayMetrics dm = new DisplayMetrics();
		try {
			@SuppressWarnings("rawtypes")
			Class c = Class.forName("android.view.Display");
			@SuppressWarnings("unchecked")
			Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
			method.invoke(display, dm);
			vh = dm.heightPixels - windowManager.getDefaultDisplay().getHeight();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return vh;
	}