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Android利用Glide获取图片真正的宽高的实例

2019-12-12 02:20:26
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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="@mipmap/ic_launcher"/></RelativeLayout>

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