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文章目录
  1. 1. 在Android自定义View中，一个标准的onMeasure()方法。

在Android自定义View中，一个标准的onMeasure()方法。

1
@Override
   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
       super.onMeasure(widthMeasureSpec, heightMeasureSpec);
       int viewWidth = circleRadius /*默认size*/+ this.getPaddingLeft() + this.getPaddingRight();
       int viewHeight = circleRadius + this.getPaddingTop() + this.getPaddingBottom();
       int widthMode = MeasureSpec.getMode(widthMeasureSpec);//获取宽度的模式
       int widthSize = MeasureSpec.getSize(widthMeasureSpec);//获取宽度的尺寸
       int heightMode = MeasureSpec.getMode(heightMeasureSpec);//高度的模式
       int heightSize = MeasureSpec.getSize(heightMeasureSpec);//高端的尺寸
       int width;
       int height;
       //Measure Width
       if (widthMode == MeasureSpec.EXACTLY) {//指定了确定的尺寸：100dp,match_parent
           //Must be this size
           width = widthSize;
       } else if (widthMode == MeasureSpec.AT_MOST) {//wrap_content类型
           //Can't be bigger than...
           width = Math.min(viewWidth, widthSize);
       } else {
           //Be whatever you want
           width = viewWidth;
       }
       //Measure Height
       if (heightMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.EXACTLY) {
           //Must be this size
           height = heightSize;
       } else if (heightMode == MeasureSpec.AT_MOST) {
           //Can't be bigger than...
           height = Math.min(viewHeight, heightSize);
       } else {
           //Be whatever you want
           height = viewHeight;
       }
       setMeasuredDimension(width, height);
   }
文章目录
  1. 1. 在Android自定义View中，一个标准的onMeasure()方法。