Android利用Glide獲取圖片真正的寬高的實例

前言

有時候需要獲取網絡圖片的寬高來設置圖片顯示的大小，很多人會直接利用Glide的加載監聽去拿圖片的寬高，但是這樣拿到的不是圖片真正的寬高，而是圖片顯示在ImageView後的寬高。如下：

    //獲取圖片顯示在ImageView後的寬高
    Glide.with(this)
        .load(imgUrl)
        .asBitmap()//強制Glide返回一個Bitmap對象
        .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);

想要拿到圖片真正的寬高，應該利用Glide的Target。如下：

    //獲取圖片真正的寬高
    Glide.with(this)
        .load(imgUrl)
        .asBitmap()//強制Glide返回一個Bitmap對象
        .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
          }
        });

完整代碼

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);

    //獲取圖片真正的寬高
    Glide.with(this)
        .load(imgUrl)
        .asBitmap()//強制Glide返回一個Bitmap對象
        .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
          }
        });

    //獲取圖片顯示在ImageView後的寬高
    Glide.with(this)
        .load(imgUrl)
        .asBitmap()//強制Glide返回一個Bitmap對象
        .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>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持本站。