原来我都是通过缩放比例。来计算图片的展示后的真实宽高。
今天看到用glide也能巧妙的获得宽高,省区了再计算这一步。
下一次遇到可以直接拿glide尝试下。
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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | //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:
1 2 3 4 5 6 7 8 9 10 11 12 13 | //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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | <? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout android:id = "@+id/activity_main" 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 > |