在activity生命周期方法:onCreate(),onStart(),onResume()中调用View.getWidth()和View.getHeight()方法获取View的高度是不可行的,因为此时布局没有加载是不可见状态。
还有当view的可见状态为:GONE,时获取的宽高也是0;
2. 解决办法:
(1)直接测量:
private void first() { int width = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); int height = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); textView.measure(width, height); int height1 = textView.getMeasuredHeight(); int width3 = textView.getMeasuredWidth(); System.out.println("first: 宽: " + width3 + " 高: " + height1); }
(2)添加绘制view之前的监听
private void second() { ViewTreeObserver vto = textView.getViewTreeObserver(); vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { public boolean onPreDraw() { int height = textView.getMeasuredHeight(); int width = textView.getMeasuredWidth(); System.out.println("second: 宽:" + width + " 高: " + height); return true; } }); }
(3)添加整体布局监听
private void third() { ViewTreeObserver vto = textView.getViewTreeObserver(); vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { public void onGlobalLayout() { textView.getViewTreeObserver().removeGlobalOnLayoutListener( this); int height = textView.getMeasuredHeight(); int width = textView.getMeasuredWidth(); System.out.println("third: 宽:" + width + " 高: " + height); } }); }
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