LayoutParams和onMeasure的效率（自定义16:9图片）

本文主要是介绍LayoutParams和onMeasure的效率（自定义16:9图片），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

-- SetLayoutParams和onMeasure的差别
setLayoutParams：设置view的宽度和高度。
onMeasure: 设置view的可见宽度和高度。

1） LayoutParams

RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.width = CommonUtils.getScreenWidth(mContext);
params.height = CommonUtils.getScreenWidth(mContext) * 9 / 16;
point.iv_news.setLayoutParams(params);

2）重写View的onMeasure()方法

android自定义正方形的imageview和textview- https://blog.csdn.net/hy_programmer/article/details/48137807

* 自定义16:9的图片显示

public class CustomRatioImageView extends ColorImageView {public CustomRatioImageView(Context context) {super(context);}public CustomRatioImageView(Context context, AttributeSet attrs) {super(context, attrs);}public CustomRatioImageView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));int childWidthSize = getMeasuredWidth();int childHeighSize = childWidthSize * 9 / 16;//高度和宽度9:16heightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeighSize, MeasureSpec.EXACTLY);widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);super.onMeasure(widthMeasureSpec, heightMeasureSpec);}
}

 

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