View设置宽高

 public class ViewMeasuare extends View {

     public ViewMeasuare(Context context, AttributeSet attrs) {
         super(context, attrs);
     }

     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         setMeasuredDimension(780, 120);
     }

 }

setMeasuredDimension 这个方法的确把我实实在在的坑了一把