android 动态 wrap_content Android开发自定义控件View应对wrap_content属性处理

直接修改onMeasure()方法即可

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

// 获取宽-测量规则的模式和大小

int widthMode = MeasureSpec.getMode(widthMeasureSpec);

int widthSize = MeasureSpec.getSize(widthMeasureSpec);

// 获取高-测量规则的模式和大小

int heightMode = MeasureSpec.getMode(heightMeasureSpec);

int heightSize = MeasureSpec.getSize(heightMeasureSpec);

// 设置wrap_content的默认宽 / 高值

// 默认宽/高的设定并无固定依据,根据需要灵活设置

// 类似TextView,ImageView等针对wrap_content均在onMeasure()对设置默认宽 / 高值有特殊处理,具体读者可以自行查看

int mWidth = 400;

int mHeight = 400;

if (getLayoutParams().width == ViewGroup.LayoutParams.WRAP_CONTENT && getLayoutParams().height == ViewGroup.LayoutParams.WRAP_CONTENT) {

setMeasuredDimension(mWidth, mHeight);

// 宽 / 高任意一个布局参数为= wrap_content时，都设置默认值

} else if (getLayoutParams().width == ViewGroup.LayoutParams.WRAP_CONTENT) {

setMeasuredDimension(mWidth, heightSize);

} else if (getLayoutParams().height == ViewGroup.LayoutParams.WRAP_CONTENT) {

setMeasuredDimension(widthSize, mHeight);

}