Resize Image to Full Width and Variable Height with Picasso

Resize image to full width and variable height with Picasso

Finally I solved it doing a transformation of Picasso, here is the snippet:

    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);
            }
    });

This line is for customize with your desired width:

int targetWidth = holder.message_picture.getWidth();

Additionally this snipped include Callback for loading hide and error drawable built-in Picasso.

If you need more information to debug any error, you MUST implement a custom listener (Picasso builder) beacuse the onError Callback information is "null". You only know that there is an error for UI behavior.

I hope this helps someone to save many hours.

Resize image to full width and fixed height with Picasso

You are looking for:

.fit().centerCrop()

What these mean:

• fit - wait until the ImageView has been measured and resize the image to exactly match its size.
• centerCrop - scale the image honoring the aspect ratio until it fills the size. Crop either the top and bottom or left and right so it matches the size exactly.

Resizing image with picasso

try this:

for your imageview:

<ImageView
android:id="@id/img"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"  //add this
android:scaleType="fitCenter" />

And in picasso use .fit().centerCrop()

Picasso.with(getContext()).load(mSelectedTrack.getArtworkURL()).resize(800,300).fit().centerCrop().into(mAlbumCoverArt);

How to set ImageView height and width before image is loaded with Picasso inside Recycerview StaggeredGridLayout

Calc the aspect ratio of your image by width/height and wrap your ImageView inside something like this:

public class RelativeSizeLayout extends FrameLayout {
    private float aspectRatio = 1.77f;

    public RelativeSizeLayout(Context context) {
        this(context,null);
    }

    public RelativeSizeLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RelativeSizeLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean shouldDelayChildPressedState() {
        return false;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int width = MeasureSpec.getSize(widthMeasureSpec);
        heightMeasureSpec = MeasureSpec.makeMeasureSpec((int) (width / aspectRatio), MeasureSpec.EXACTLY);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    public void setAspectRatio(float ratio) {
        aspectRatio = ratio;
    }
}

Android Picasso resize() not consistent

It turns out that the imageview was stretching the image after picasso did its thing.

I tried to set the imageview height, but the OS overrode me.

In the end I set imageView.scaletype="matrix", and now it does not stretch my image.

hope that helps someone else, i've spent a lot of time on this.

scaling image size in Picasso

Breaking the first part down in to two sections:

I want the image to display in it's original aspect ratio

To do this you can call .fit().centerInside() on the Picasso request

scaled to be a reasonable size - ie 75% of the screen width

The easiest way to do this would be to specify this in your layout, so set an ImageView to be this width. Then when Picasso loads the image into this ImageView it will automatically scale it to fit (but keeping the aspect ratio as specified above).

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