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() {
   @Override
   public boolean onException(Exception e, String model, Target target, boolean isFirstResource) {
     Log.d(TAG, "onException " + e.toString());
     return false;
   }

   @Override
   public boolean onResourceReady(Bitmap bitmap, String model, Target 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() {
   @Override
   public void onResourceReady(Bitmap bitmap, GlideAnimation 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() {
   @Override
   public void onResourceReady(Bitmap bitmap, GlideAnimation 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() {
   @Override
   public boolean onException(Exception e, String model, Target target, boolean isFirstResource) {
     Log.d(TAG, "onException " + e.toString());
     return false;
   }

   @Override
   public boolean onResourceReady(Bitmap bitmap, String model, Target 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

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