Android piccaso 缩放小图像以适应大图像视图而不影响图像质量

Question

我见过很多缩小大图像并使其不适合小图像的例子。但我的问题是如何在不损失质量的情况下增加图像的大小以适应特定的高度。下面是我试图实现的代码：

  [![Picasso.with(context).load(context.getResources().getString(R.string.host) + aiAndroidResponse.getImage_url()).into(new Target() {
                    @Override
                    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom loadedFrom) {

                        //whatever algorithm here to compute size
                        float ratio = (float) bitmap.getHeight() / (float) bitmap.getWidth();
                        float heightFloat = ((float) role_image.getWidth()) * ratio;

                        final android.view.ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) role_image.getLayoutParams();

                        layoutParams.height = (int) heightFloat;
                        layoutParams.width = (int) role_image.getWidth();
                        role_image.setLayoutParams(layoutParams);
                        role_image.setImageBitmap(bitmap);
                    }

                    @Override
                    public void onBitmapFailed(Drawable errorDrawable) {

                    }

                    @Override
                    public void onPrepareLoad(Drawable placeHolderDrawable) {

                    }


                });][1]][1]

下面是 xml 垂直线性布局的文件：

 <ImageView
                android:id="@+id/role_image"
                android:layout_width="100dp"
                android:layout_height="match_parent"
                android:src="@drawable/profile_default" />

请看下图 android 屏幕

Answer 1

how can i increase size of image to fit a specific height without losing its quality

那当然不可能。

Android piccaso 缩放小图像以适应大图像视图而不影响图像质量

Android piccaso scale small image to fit large imageview without affecting the quality of image

android

android-imageview

picasso