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();
}
}
Paste_Image.png
本文作者简书地址:
http://www.jianshu.com/u/303ec9abdc08
作者博客地址:http://blog.csdn.net/e_Inch_Photo/article/details/61190342
