View - 获取某个view 宽高的四种方法

最新推荐文章于 2025-01-27 21:26:45 发布

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#视图

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本文介绍了Android中四种获取视图尺寸的方法：Activity#onWindowFocusChanged、view.post(runnable)、ViewTreeObserver及view.measure。这些方法适用于不同场景，如响应窗口焦点变化、延迟执行任务、监听全局布局变化及手动测量视图尺寸。

1.Activity# onWindowFousChanged


   @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if(hasFocus){
            int height = main_viewpager.getMeasuredHeight();
            int width = main_viewpager.getMeasuredWidth();
        }
    }

多次调用在窗口得到焦点和失去焦点

2.view.post(runnable)

  @Override
    protected void onStart() {
        super.onStart();
        main_viewpager.post(new Runnable() {
            @Override
            public void run() {
                int height = main_viewpager.getMeasuredHeight();
                int width = main_viewpager.getMeasuredWidth();
            }
        });
    }

3.ViewTreeObserver


 @Override
    protected void onStart() {
        super.onStart();

        ViewTreeObserver viewTreeObserver = main_viewpager.getViewTreeObserver();

        viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                main_viewpager.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                int height = main_viewpager.getMeasuredHeight();
                int width = main_viewpager.getMeasuredWidth();
            }
        });
    }