-- 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); } @Override protected 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9:16 heightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeighSize, MeasureSpec.EXACTLY); widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } }