自定义控件的时候getMeasuredWidth/getMeasuredHeight它的赋值在View的setMeasuredDimension中，所以有时可以在onMeasure方法中看到利用getMeasuredWidth/getMeasuredHeight初始化别的参数。而getWidth/getHeight一直在onLayout完成后才会被赋值。一般情况下，如果都完成了赋值，两者值是相同的。
可以在自定义View的onMessure、onLayout、onDraw里面打印看看区别
public class MyView extends View { private static final String TAG = MyView.class.getSimpleName(); public MyView(Context context) { super(context); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); } public MyView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); Log.d(TAG, "======>"+"onMeasure") ; printWH(); } private void printWH() { Log.d(TAG,"getMeasuredWidth:"+getMeasuredWidth()); Log.d(TAG,"getMeasuredHeight:"+getMeasuredHeight()); Log.d(TAG,"getWidth:"+getWidth()); Log.d(TAG,"getHeight:"+getHeight()); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); Log.d(TAG,"======>"+"onLayout") ; printWH(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Log.d(TAG,"======>"+"onDraw") ; printWH(); } }本文作者简书地址: http://www.jianshu.com/p/f0cefbdc6d55
作者博客地址: http://blog.csdn.net/e_inch_photo
