4种Android获取View宽高的方式

@Override
  public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus) {
      System.out.println("onWindowFocusChanged width="
          + tvTest.getWidth() + " height=" + tvTest.getHeight());
    }
  }

/**
   * 会执行多次
   */
  private void getSize1() {

    ViewTreeObserver vto = tvTest.getViewTreeObserver();
    vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
      @Override
      public boolean onPreDraw() {
        int height = tvTest.getMeasuredHeight();
        int width = tvTest.getMeasuredWidth();
        System.out.println("height" + height);
        System.out.println("width" + width);
        return true;
      }

    });
  }

private void getSize2() {
    ViewTreeObserver viewTreeObserver = tvTest.getViewTreeObserver();
    viewTreeObserver
        .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
          @Override
          public void onGlobalLayout() {
            tvTest.getViewTreeObserver()
                .removeGlobalOnLayoutListener(this);
            System.out.println("onGlobalLayout width="
                + tvTest.getWidth() + " height="
                + tvTest.getHeight());
          }
        });
  }

private void getSize3() {
    tvTest.post(new Runnable() {

      @Override
      public void run() {
        System.out.println("postDelayed width=" + tvTest.getWidth()
            + " height=" + tvTest.getHeight());
      }
    });

  }