Android利用Glide获取图片真正的宽高

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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="https://www.jianshu.com/p/299b637afe7c/@mipmap/ic_launcher"/>
</RelativeLayout>

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