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：

privatevoidfirst(){intwidth=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);intheight=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);textView.measure(width,height);intheight1=textView.getMeasuredHeight();intwidth3=textView.getMeasuredWidth();System.out.println("first:宽："+width3+"高："+height1);}

（2）添加绘制view之前的监听

privatevoidsecond(){ViewTreeObservervto=textView.getViewTreeObserver();vto.addOnPreDrawListener(newViewTreeObserver.OnPreDrawListener(){publicbooleanonPreDraw(){intheight=textView.getMeasuredHeight();intwidth=textView.getMeasuredWidth();System.out.println("second:宽："+width+"高："+height);returntrue;}});}

（3）添加整体布局监听

privatevoidthird(){ViewTreeObservervto=textView.getViewTreeObserver();vto.addOnGlobalLayoutListener(newOnGlobalLayoutListener(){publicvoidonGlobalLayout(){textView.getViewTreeObserver().removeGlobalOnLayoutListener(this);intheight=textView.getMeasuredHeight();intwidth=textView.getMeasuredWidth();System.out.println("third:宽："+width+"高："+height);}});}