/**
   * 获取屏幕的宽
   *
   * @param context
   * @return
   */
  public static int getScreenWidth(Context context) {
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    DisplayMetrics dm = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(dm);
    return dm.widthPixels;
  }

  /**
   * 获取屏幕的高度
   *
   * @param context
   * @return
   */
  public static int getScreenHeight(Context context) {
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    DisplayMetrics dm = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(dm);
    return dm.heightPixels;
  }

  public static int getRealHeight(Context context) {
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    int screenHeight = 0;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      DisplayMetrics dm = new DisplayMetrics();
      display.getRealMetrics(dm);
      screenHeight = dm.heightPixels;

      //或者也可以使用getRealSize方法
//      Point size = new Point();
//      display.getRealSize(size);
//      screenHeight = size.y;
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
      try {
        screenHeight = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
      } catch (Exception e) {
        DisplayMetrics dm = new DisplayMetrics();
        display.getMetrics(dm);
        screenHeight = dm.heightPixels;
      }
    }
    return screenHeight;
  }

  public static int getNavigationBarHeight(Context context) {
    int navigationBarHeight = -1;
    Resources resources = context.getResources();
    int resourceId = resources.getIdentifier("navigation_bar_height","dimen", "android");
    if (resourceId > 0) {
      navigationBarHeight = resources.getDimensionPixelSize(resourceId);
    }
    return navigationBarHeight;
  }

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

  public void getStatusBarHeightByReflect() {
    int statusBarHeight2 = -1;
    try {
      Class<?> clazz = Class.forName("com.android.internal.R$dimen");
      Object object = clazz.newInstance();
      int height = Integer.parseInt(clazz.getField("status_bar_height")
          .get(object).toString());
      statusBarHeight2 = getResources().getDimensionPixelSize(height);
    } catch (Exception e) {
      e.printStackTrace();
    }
    Log.e(TAG, "状态栏高度-反射方式：" + statusBarHeight2);
  }

  /**
   * 应用区的顶端位置即状态栏的高度
   * *注意*该方法不能在初始化的时候用
   * */
  public void getStatusBarHeightByTop() {
    
    Rect rectangle = new Rect();
    getWindow().getDecorView().getWindowVisibleDisplayFrame(rectangle);
    Log.e(TAG, "状态栏高度-应用区顶部:" + rectangle.top);
  }

/**
   * 不能在 onCreate 方法中使用。
   * 因为这种方法依赖于WMS（窗口管理服务的回调）。正是因为窗口回调机制，所以在Activity初始化时执行此方法得到的高度是0。
   * 这个方法推荐在回调方法onWindowFocusChanged()中执行，才能得到预期结果。
   */
  public void getAppViewHeight(){
    //屏幕
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    //应用区域
    Rect outRect1 = new Rect();
    getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect1);
    int statusBar = dm.heightPixels - outRect1.height(); //状态栏高度=屏幕高度-应用区域高度
    Log.e(TAG, "应用区高度:" + statusBar);
  }

public static int getContentViewHeight(Activity activity) {
    Rect rectangle= new Rect();
    activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getDrawingRect(rectangle);
    return rectangle.height();
  }

  public static void getTitleBarHeight(Activity activity) {
    Rect outRect1 = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect1);

    int viewTop = activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();  //要用这种方法
    int titleBarH = viewTop - outRect1.top;

    Log.e(TAG, "标题栏高度-计算:" + titleBarH);
  }