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>