Android(安卓)获取控件宽高的3种方法

  /**     * 获取控件宽高 此方法会加载onMeasure三次     *     * @param v     * @return 宽高坐标     */        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        v.measure(w, h);        int width = v.getMeasuredWidth();        int height = v.getMeasuredHeight();    /**     * 获取控件宽高 此方法会加载onMeasure二次，但是回调函数会回调很多次     *     * @param v     * @return 宽高坐标     */        ViewTreeObserver viewTreeObserver = v.getViewTreeObserver();        viewTreeObserver.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {            @Override            public boolean onPreDraw() {                int width = v.getMeasuredWidth();                int height= v.getMeasuredHeight();                return true;            }        });    /**     * 获取控件宽高 此方法会加载onMeasure二次，但是回调函数只回调一次     *     * @param v     * @return 宽高坐标     */        ViewTreeObserver vto = v.getViewTreeObserver();        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            @Override            public void onGlobalLayout() {                v.getViewTreeObserver().removeGlobalOnLayoutListener(this);                int width = v.getMeasuredWidth();                int height = v.getMeasuredHeight();            }        });
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