Develop Reference

Android Picasso load image to Bitmap variable cropping it to square

I need to load some images from URI to Bitmap variables and perform some operation with them togheter. I need the bitmaps to be squared images with fixes size, scaled down and cropped. By now I use this code:
return Picasso.with(c).load(imageUri).resize(size, size).get();
but, obviously, the image will be resized without keep its aspect ratio.
I want to resize the image with these requirements:
the smaller dimension (width or height) should be equals to size
the greater dimension should be cropped to size, keep image centered

The key is using centerInside after resize. See link
Picasso.with(c).load(imageUri).resize(size, size).centerInside().get()

set your imageview height and width fix inside xml and then set image to imageview like
Picasso.with(YourActivityName.this)
.load(imageUri)
.into(imageview_id);

How to get width of what image really occupies on the ImageView android

I have an activity which only has an ImageView on it. I'm setting an image bitmap for this view that is much taller than wider. So, for example, my activity has 720x950 and my image is 918x2077.
When I add the image in the imageView, both side parts of imageView stays white (read: no image in there).
If I call mImage.getWidth() it returns me the width of the entire imageView of 720 (which is the activity wide).
I would like to get the width of the image in specific, not of the view.. is that possible?

It sounds like the aspect ratio of your image is being kept. You want to know how much width the image is actually occupying.
You can calculate it!
if your bitmap is 918x2077 and your window size is 720x950, then to calculate your width, simply do:
(950/2077) * 918 = 419.8844...
Hope this helps :)

Android- How to get image size

I have an image loaded asynchronously by its url. Then i set the layout width and height according to the size of the of the image loaded. Is there a way i can get this aside from getting the size from my ImageLoader class using BitmapFactoryOptions (i forgot the, if it is BitmapOptions or BitmapFactoryOptions).
The problem is that at the start of the activity, the image is not rendered.

I am not quitely sure your case, but it is still able to get image's size by setting BitmapFactory.Options.inJustDecodeBounds = true even when the image is not rendered.

Drawing a large number of ImageViews with the same Bitmap but different size

I am trying to draw multiple ImageViews inside a single LinearLayout.
All the ImageViews need to have a single bitmap.
The ImageViews will only vary in size.
The single bitmap will not be resized.
The simple way is to create one Bitmap per ImageView. But, this runs out of memory quickly.
final Bitmap placeholderBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
final Canvas canvas = new Canvas(placeholderBitmap);
canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.placeholder_image), 0, 0, null);
imageView.setImageBitmap(placeholderBitmap);
linearLayout.addView(imageView);
I also tried setting the max and min height and width, no effect. The images remain the same size.
imageView.setImageResource(R.drawable.ic_no_image);
imageView.setMaxHeight(imageViewInfo.height);
imageView.setMaxWidth(imageViewInfo.width);
I believe working with Drawables is the right "Android" way to do it, but I can't find a way to dynamically create a Drawable with the right side and layering the shared bitmap into it.

Just use one Bitmap -- as you say they will all use the same Bitmap, so no duplication is necessary.
If you want the ImageViews to have different sizes and have the Bitmap scale itself to the size of the ImageView then use the setScaleType or android:scaleType attribute to set the scaling of the ImageView. For instance FIT_START maintains the aspect ratio of your image and tries to fill the ImageView starting from the top-left corner.
I don't see any need to create a Drawable, though if you need to you can just create one from a Bitmap using:
Drawable d = new BitmapDrawable(bitmap);
ImageView actually does this automatically when you call setImageBitmap(...).

ImageView will always resize the bitmap to it need proportions.
If you want to save memory, resize the bitmaps manually and set them into the ImageViews this should stop the ImageView from resizing it internally - to make sure, you can set the layout_width and layout_hieght of the image view to 'wrap_content'.

I think may be looking for a ClipDrawable.
You would set the android:drawable property of the clip XML to your bitmap
That or you can do it with the Java code also given in the example

Use image sizes

Is there a way to use an image size when setting the sizes of a view? I want to create a TextView item with the exact height of a resource image, but I don't want to use the image as a background for the text view.

If you can get the height of the image, you can use TextView's setHeight. If you read in the image as a Bitmap, you can get the image's height with getHeight.