FixImageView 自动调整等比高宽

gistfile1.java

package com.example.imagetext.view;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class FixImageView extends ImageView{
    
    private int mFixWidth = -1;

    public FixImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        init();
    }

    public FixImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        init();
    }

    public FixImageView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        init();
    }
    
    private void init(){
        
    }
    
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // It is Auto-generated method stub
        if (mFixWidth > 0){
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(mFixWidth, MeasureSpec.EXACTLY);
            setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
            return;
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        // It is Auto-generated method stub
        float height = getHeight();
        mFixWidth = (int) ((height / drawable.getIntrinsicHeight()) * drawable.getIntrinsicWidth());
        System.out.println(String.format("h:%f, fixw: %d, dh: %d, dw: %d", height, mFixWidth, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()));
        requestLayout();
        super.setImageDrawable(drawable);
    }
}