/**
* 按比例縮放的ImageView
* 用于圖片按比例縮放(寬度填滿机隙,高度自適應)
* 注:如果不指定寬度蜘拉,則默認填滿屏幕。
*/
public class ScaleImageView extends ImageView {
public ScaleImageView(Context context) {
super(context);
}
public ScaleImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ScaleImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Drawable drawable = getDrawable();
if (drawable != null) {
int width = MeasureSpec.getSize(widthMeasureSpec);//高度根據(jù)寬度計算而得
int height = (int) Math.ceil((float) width * (float) drawable.getIntrinsicHeight() / (float) drawable.getIntrinsicWidth());
setMeasuredDimension(width, height);
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}
在xml布局文件中直接使用
<com.wy.test.other.ScaleImageView
android:layout_width="200dp"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher" />
原文鏈接:https://blog.csdn.net/qq941263013/article/details/80942666