I want to create an Android Gallery with different size columns

Question

I want to create a Photo Gallery with two columns, like shown in the image here

The image must be subsampled and also keep her aspect ratio. This is the custom transformation that subsamples the image:

  public ImageCustomTransformation(Context context, int maxWidth, int maxHeight) {
    super(context);
    this.maxWidth = maxWidth;
    this.maxHeight = maxHeight;
}

@Override
protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {

    int targetWidth, targetHeight;
    double aspectRatio;

    if (toTransform.getWidth() > toTransform.getHeight()) {
        targetWidth = maxWidth;
        aspectRatio = (double) toTransform.getHeight() / (double) toTransform.getWidth();
        targetHeight = (int) (targetWidth * aspectRatio);
    } else {
        targetHeight = maxHeight;
        aspectRatio = (double) toTransform.getWidth() / (double) toTransform.getHeight();
        targetWidth = (int) (targetHeight * aspectRatio);
    }

    Bitmap result = Bitmap.createScaledBitmap(toTransform, targetWidth, targetHeight, false);
    if (result != toTransform) {
        toTransform.recycle();
    }
    return result;
}

Here is the code for the GridView:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/darker_gray">

<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/grid_view_photos"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/set_photo_button"
    android:layout_below="@+id/relativeLayout2"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="10dp"
    android:numColumns="2"
    android:horizontalSpacing="10dp"
    android:verticalSpacing="10dp" />

<Button
    android:id="@+id/set_photo_button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:text="Upload Photo" />
</RelativeLayout>

And here is the item for the GridView:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/and`enter code here`roid"
xmlns:cardview="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@android:color/white"
cardview:cardCornerRadius="5dp">

<ImageView
    android:id="@+id/image_view_gallery"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="5dp"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="5dp"></ImageView>
</android.support.v7.widget.CardView>

To load the images I am using Glide Library, and I pass it the Context and the dimensions to subsample(transform) the images. The result is not the one I imagined. Can anyone help me figure out how to accomplish the layout from the example image above? Thanks!

Answer 1

Look for AsymmetricGridView or QuiltViewLibrary, these examples might be useful.