android - 使用毕加索将图像大小调整为全宽和可变高度

Question

我有一个带有ImageView可变大小（宽度和高度）的适配器的 listView。我需要将使用毕加索加载的图片调整为布局的最大宽度和图片纵横比给出的可变高度。

我已经检查了这个问题： Resize image to full width and fixed height with Picasso

作品，fit()但我没有找到任何东西来保持图片的纵横比。

如果我固定适配器布局中的高度，此代码部分有效：

Picasso.with(this.context).load(message_pic_url)
.placeholder(R.drawable.profile_wall_picture)
.fit().centerInside()
.into(holder.message_picture);

但它会在 listView 的图片之间生成空格，因为图片可能没有那个高度。

提前致谢。

score 94 · Accepted Answer

从 Picasso 2.4.0 开始，现在直接支持此操作。只需添加一个.resize()维度为的请求0。例如，要具有可变宽度，您的调用将变为：

Picasso.with(this.context)
       .load(message_pic_url)
       .placeholder(R.drawable.profile_wall_picture)
       .resize(0, holder.message_picture.getHeight()),
       .into(holder.message_picture);

请注意，此调用使用.getHeight()并因此假定message_picture已测量。如果不是这种情况，例如当您在 a 中扩展了一个新视图时ListAdapter，您可以通过在视图中添加一个来延迟此调用直到测量之后OnGlobalLayoutListener：

holder.message_picture.getViewTreeObserver()
      .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            // Wait until layout to call Picasso
            @Override
            public void onGlobalLayout() {
                // Ensure we call this only once
                imageView.getViewTreeObserver()
                         .removeOnGlobalLayoutListener(this);


                Picasso.with(this.context)
                       .load(message_pic_url)
                       .placeholder(R.drawable.profile_wall_picture)
                       .resize(0, holder.message_picture.getHeight())
                       .into(holder.message_picture);
            }
        });

score 86 · Accepted Answer

我遇到了同样的问题，我花了一段时间才找到解决方案，但我终于找到了适合我的东西。

首先，我将毕加索的电话改为

Picasso.with(this.context).load(message_pic_url)
.placeholder(R.drawable.profile_wall_picture)
.into(holder.message_picture);

删除fit和centerInside。接下来，您需要将以下行添加到 XML 中的 ImageView

android:scaleType="fitStart"
android:adjustViewBounds="true"

希望它也对你有用。

score 62 · Accepted Answer

最后我解决了它做毕加索的转换，这里是片段：

    Transformation transformation = new Transformation() {

        @Override
        public Bitmap transform(Bitmap source) {
            int targetWidth = holder.message_picture.getWidth();

            double aspectRatio = (double) source.getHeight() / (double) source.getWidth();
            int targetHeight = (int) (targetWidth * aspectRatio);
            Bitmap result = Bitmap.createScaledBitmap(source, targetWidth, targetHeight, false);
            if (result != source) {
                // Same bitmap is returned if sizes are the same
                source.recycle();
            }
            return result;
        }

        @Override
        public String key() {
            return "transformation" + " desiredWidth";
        }
    };

    mMessage_pic_url = message_pic_url;

    Picasso.with(this.context)
        .load(message_pic_url)
        .error(android.R.drawable.stat_notify_error)
        .transform(transformation)
        .into(holder.message_picture, new Callback() {
            @Override
            public void onSuccess() {
                holder.progressBar_picture.setVisibility(View.GONE);
            }

            @Override
            public void onError() {
                Log.e(LOGTAG, "error");
                holder.progressBar_picture.setVisibility(View.GONE);
            }
    });

此行用于自定义您想要的宽度：

int targetWidth = holder.message_picture.getWidth();

此外，此剪辑包括用于加载隐藏和错误可绘制内置毕加索的回调。

如果您需要更多信息来调试任何错误，则必须实现自定义侦听器（Picasso 构建器），因为onError Callback信息为“null”。你只知道 UI 行为有错误。

我希望这可以帮助某人节省很多时间。

score 11 · Accepted Answer

可能接受的答案对所有人都有用，但如果您ViewHolder为 Multiple绑定 Multiple，Views那么您可以通过为Transformation创建Class并从ViewHolder.

/**
 * Created by Pratik Butani
 */
public class ImageTransformation {

    public static Transformation getTransformation(final ImageView imageView) {
        return new Transformation() {

            @Override
            public Bitmap transform(Bitmap source) {
                int targetWidth = imageView.getWidth();

                double aspectRatio = (double) source.getHeight() / (double) source.getWidth();
                int targetHeight = (int) (targetWidth * aspectRatio);
                Bitmap result = Bitmap.createScaledBitmap(source, targetWidth, targetHeight, false);
                if (result != source) {
                    // Same bitmap is returned if sizes are the same
                    source.recycle();
                }
                return result;
            }

            @Override
            public String key() {
                return "transformation" + " desiredWidth";
            }
        };
    }
}

来自ViewHolder：

Picasso.with(context).load(baseUrlForImage)
                     .transform(ImageTransformation.getTransformation(holder.ImageView1))
                     .error(R.drawable.ic_place_holder_circle)
                     .placeholder(R.drawable.ic_place_holder_circle)
                     .into(holder.mMainPhotoImageView1);

希望它会帮助你。

score 3 · Accepted Answer

    Picasso.with(this).load(url).resize(1800, 1800).centerInside().into(secondImageView)

    <ImageView
        android:id="@+id/SecondImage"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:adjustViewBounds="true"
        android:layout_margin="10dp"
        android:visibility="gone"/>

这将帮助您为所有设备设置可变高度的图像

score 1 · Accepted Answer

imageView.post(new Runnable() {
      @Override public void run() {
        Picasso.with(context)
            .resize(0, imageView.getHeight())
            .onlyScaleDown()
            .into(imageView, new ImageCallback(callback, null));
      }
    });

score 0 · Accepted Answer

我编写了简单的助手，负责添加布局完成侦听器并在布局过程完成时调用 into(imageView)。

public class PicassoDelegate {

private RequestCreator mRequestCreator;

public PicassoDelegate(ImageView target, RequestCreator requestCreator) {
    if (target.getWidth() > 0 && target.getHeight() > 0) {
        complete(target, requestCreator);
    } else {
        mRequestCreator = requestCreator;
        target.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                v.removeOnLayoutChangeListener(this);
                complete((ImageView) v, mRequestCreator);
            }
        });

    }

}

private void complete(ImageView target, RequestCreator requestCreator) {
    if (target.getWidth() > 0 && target.getHeight() > 0) {
        requestCreator.resize(target.getWidth(), target.getHeight());
    }

    requestCreator.into(target);
}

}

因此，您可以像这样轻松地使用它，例如在片段的 onViewCreated()

new PicassoDelegate(customerPhoto, Picasso.with(getActivity()).load(user.getPhotoUrl()).centerCrop());

score 0 · Accepted Answer

public class CropSquareTransformation implements Transformation {

  private int mWidth;
  private int mHeight;

  @Override public Bitmap transform(Bitmap source) {
    int size = Math.min(source.getWidth(), source.getHeight());

    mWidth = (source.getWidth() - size) / 2;
    mHeight = (source.getHeight() - size) / 2;

    Bitmap bitmap = Bitmap.createBitmap(source, mWidth, mHeight, size, size);
    if (bitmap != source) {
      source.recycle();
    }

    return bitmap;
  }

  @Override public String key() {
    return "CropSquareTransformation(width=" + mWidth + ", height=" + mHeight + ")";
  }

更多转换：https ://github.com/wasabeef/picasso-transformations

score 0 · Accepted Answer

扩展 ImageView 然后覆盖 onMeasure 方法，如下所示。

@Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
        Drawable d = getDrawable();

        if(d!=null && fittingType == FittingTypeEnum.FIT_TO_WIDTH){
            int width = MeasureSpec.getSize(widthMeasureSpec);
            int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
            setMeasuredDimension(width, height);
        }else{
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

score 0 · Accepted Answer

实际上我是在加载具有可缩放功能的 CustomImageView 中的图像时进入的

错误是

java.lang.RuntimeException: Transformation transformation desiredWidth crashed with exception.

我通过编辑从接受的答案给出的代码解决了这个问题，我得到了显示的最大宽度，就好像我的 imageview 宽度已经是 match_parent。

如果（！imgUrl.equals（“”））{

        DisplayMetrics displayMetrics = new DisplayMetrics();
        ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
        int height = displayMetrics.heightPixels;
        int width = displayMetrics.widthPixels;

        Picasso.with(context).load(imgUrl)
                .transform(getTransformation(width, imageView))
                .into(imageView, new Callback() {
                    @Override
                    public void onSuccess() {
                        if (progressBar != null) {
                            progressBar.setVisibility(View.GONE);
                        }
                    }

                    @Override
                    public void onError() {
                        if (progressBar != null) {
                            progressBar.setVisibility(View.GONE);
                        }
                    }
                });
    }

    public static Transformation getTransformation(final int width, final ImageView imageView) {
        return new Transformation() {
            @Override
            public Bitmap transform(Bitmap source) {
                int targetWidth = width;
                double aspectRatio = (double) source.getHeight() / (double) source.getWidth();
                int targetHeight = (int) (targetWidth * aspectRatio);
                Bitmap result = Bitmap.createScaledBitmap(source, targetWidth, targetHeight, false);
                if (result != source) {
                    // Same bitmap is returned if sizes are the same
                    source.recycle();
                }
                return result;
            }

            @Override
            public String key() {
                return "transformation" + " desiredWidth";
            }
        };
    }

score 0 · Accepted Answer

Picasso.get()
.load(message_pic_url)
.fit()
.centerCrop()
.placeholder(R.drawable.profile_wall_picture)
.into(holder.message_picture);

试试这个代码，为我工作。

score 0 · Accepted Answer

@Override
    protected void onResume() {
        super.onResume();

        imageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                loadImageIfReady();
            }
        });

    }

    private void loadImageIfReady() {
        if (imageView.getMeasuredWidth() <= 0 || mPayload == null)
            this.finish();    // if not ready GTFO

        Picasso.with(this)
                    .load(mPayload)
                    .resize(imageView.getMeasuredWidth(), imageView.getMeasuredWidth())
                    .centerInside()
                    .into(imageView);


    }

android - 使用毕加索将图像大小调整为全宽和可变高度

12 回答 12

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