package com.lcjian.library.widget;
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import android.content.Context;
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import android.graphics.drawable.Drawable;
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import androidx.annotation.Nullable;
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import android.util.AttributeSet;
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import android.widget.ImageView;
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/**
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* Created by weikou2015 on 2018/4/9.
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*/
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public class ResizableImageView extends ImageView {
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public ResizableImageView(Context context) {
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super(context);
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}
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public ResizableImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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}
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public ResizableImageView(Context context, @Nullable AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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Drawable d = getDrawable();
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if (d != null) {
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// ceil not round - avoid thin vertical gaps along the left/right edges
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int width = MeasureSpec.getSize(widthMeasureSpec);
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//高度根据使得图片的宽度充满屏幕计算而得
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int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
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setMeasuredDimension(width, height);
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} else {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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}
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