解决Glide首次进来不加载图片的情况

方法一：

    Glide.with(mContent)

        .load(school_icon.get(position))

        .placeholder(R.drawable.test)

        .dontAnimate()//添加这行代码

        .into(holder.schoolIcon);

方法二：

    .into(new SimpleTarget() {

     @Override

     public void onResourceReady(GlideDrawable resource,

        GlideAnimation glideAnimation) {

         iv_img.setImageDrawable(resource);

     }

    });