Android picasso scale photos to be bigger or fit the imageView (no white space)

Question

I have a serious problem with the Picasso library scaling. The problem is that I have a layout consisting of 3 Main views and some buttons. Views are like :

ImageView 50% mapView 20% EditTextView 30%

And I want to load pictures of unknown resolution into that imageView without leaving white spaces. I was trying to use .fit().centerInside but that just left white spaces on the sides. This is how my layout looks like:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_below="@+id/photo1"
        android:weightSum="10">

        <ImageView
        android:id="@+id/photo1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="5"
        android:background="#75aea7ab" />

        <com.google.android.gms.maps.MapView
            android:id="@+id/map2"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="2" />

        <EditText
            android:id="@+id/edittext"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_marginBottom="15dp"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="15dp"
            android:layout_weight="3"
            android:background="#00000000"
            android:gravity="top|left"
            android:inputType="textMultiLine"
            android:textColor="#ff000000"
            android:textSize="15sp" />
    </LinearLayout>
<ImageButton
    android:id="@+id/post"
    android:layout_width="@dimen/fab_button_diameter"
    android:layout_height="@dimen/fab_button_diameter"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentRight="true"
    android:layout_gravity="end"
    android:layout_marginBottom="300dp"
    android:background="@drawable/fab_shape"
    android:src="@drawable/forward"
    android:text="Post!"
    android:tint="@android:color/white" />

<Button
    android:id="@+id/camera"
    android:layout_width="72dp"
    android:layout_height="72dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="75dp"
    android:layout_marginTop="100dp"
    android:background="@drawable/camera" />

<Button
    android:id="@+id/gallery"
    android:layout_width="72dp"
    android:layout_height="72dp"
    android:layout_alignParentEnd="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:layout_marginRight="75dp"
    android:layout_marginTop="100dp"
    android:background="@drawable/gallery" />

Answer 1

Have you try to set the ScaleType after the image has been loaded?

   mPicasso.load("yourUrl")
                    .into(yourImageView, new Callback() {
                        @Override
                        public void onSuccess() {
                            yourImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);//Or ScaleType.FIT_CENTER
                        }
                        @Override
                        public void onError() {
                            //nothing for now
                        }
                    });