Android利用Glide获取图片真正的宽高的实例

前言

有时候需要获取网络图片的宽高来设置图片显示的大小，很多人会直接利用glide的加载监听去拿图片的宽高，但是这样拿到的不是图片真正的宽高，而是图片显示在imageview后的宽高。如下：

    //获取图片显示在imageview后的宽高
    glide.with(this)
        .load(imgurl)
        .asbitmap()//强制glide返回一个bitmap对象
        .listener(new requestlistener<string, bitmap>() {
          @override
          public boolean onexception(exception e, string model, target<bitmap> target, boolean isfirstresource) {
            log.d(tag, "onexception " + e.tostring());
            return false;
          }

          @override
          public boolean onresourceready(bitmap bitmap, string model, target<bitmap> target, boolean isfrommemorycache, boolean isfirstresource) {
            int width = bitmap.getwidth();
            int height = bitmap.getheight();
            log.d(tag, "width2 " + width); //400px
            log.d(tag, "height2 " + height); //400px
            return false;
          }
        }).into(miv_img);

想要拿到图片真正的宽高，应该利用glide的target。如下：

    //获取图片真正的宽高
    glide.with(this)
        .load(imgurl)
        .asbitmap()//强制glide返回一个bitmap对象
        .into(new simpletarget<bitmap>() {
          @override
          public void onresourceready(bitmap bitmap, glideanimation<? super bitmap> glideanimation) {
            int width = bitmap.getwidth();
            int height = bitmap.getheight();
            log.d(tag, "width " + width); //200px
            log.d(tag, "height " + height); //200px
          }
        });

完整代码

mainactivity.java

public class mainactivity extends appcompatactivity {

  private imageview miv_img;
  string imgurl = "https://ss2.bdstatic.com/70cfvnsh_q1ynxgkpowk1hf6hhy/it/u=523024675,1399288021&fm=117&gp=0.jpg";
  private string tag = this.getclass().getsimplename();

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    miv_img = (imageview) findviewbyid(r.id.iv_img);

    //获取图片真正的宽高
    glide.with(this)
        .load(imgurl)
        .asbitmap()//强制glide返回一个bitmap对象
        .into(new simpletarget<bitmap>() {
          @override
          public void onresourceready(bitmap bitmap, glideanimation<? super bitmap> glideanimation) {
            int width = bitmap.getwidth();
            int height = bitmap.getheight();
            log.d(tag, "width " + width); //200px
            log.d(tag, "height " + height); //200px
          }
        });

    //获取图片显示在imageview后的宽高
    glide.with(this)
        .load(imgurl)
        .asbitmap()//强制glide返回一个bitmap对象
        .listener(new requestlistener<string, bitmap>() {
          @override
          public boolean onexception(exception e, string model, target<bitmap> target, boolean isfirstresource) {
            log.d(tag, "onexception " + e.tostring());
            return false;
          }

          @override
          public boolean onresourceready(bitmap bitmap, string model, target<bitmap> target, boolean isfrommemorycache, boolean isfirstresource) {
            int width = bitmap.getwidth();
            int height = bitmap.getheight();
            log.d(tag, "width2 " + width); //400px
            log.d(tag, "height2 " + height); //400px
            return false;
          }
        }).into(miv_img);
  }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
  android:id="@+id/activity_main"
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <imageview
    android:id="@+id/iv_img"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:layout_centerinparent="true"
    android:scaletype="centercrop"
    android:src="@mipmap/ic_launcher"/>

</relativelayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。