A listview adapter that arranges images in a fluid grid. Callbacks for loading the image into the view and for when a single cell is tapped. Allows for custom cell padding, row height, and cell background.

Display a grid of photos	Adjust padding and row height	Set the cell background color

Create a FluidGridAdapter by passing in an array of objects that have:

1. an image url/tag/identifier
2. an aspect ratio OR width & height

Here's using an example using a library such as Picasso

////////////////////////////////////////////////////////////////////////////////
//Query the MediaStore for device photos and build an array of ImageData objects
////////////////////////////////////////////////////////////////////////////////
String[] projection = { MediaStore.Images.Thumbnails._ID,
    MediaStore.Images.Thumbnails.DATA, MediaStore.Images.Thumbnails.HEIGHT,
    MediaStore.Images.Thumbnails.WIDTH };

Cursor cursor = getContentResolver().query(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
    projection, null, null, null);
ArrayList imageDatas = new ArrayList();
int photoHeightIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.HEIGHT);
int photoWidthIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.WIDTH);
int fileLocationIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
while(cursor.moveToNext()) {
  int photoHeight = cursor.getInt(photoHeightIndex);
  int photoWidth = cursor.getInt(photoWidthIndex);
  String fileLocation = cursor.getString(fileLocationIndex);

  if(photoWidth > 0 && photoHeight > 0) {
    ImageData imageData = new ImageData(fileLocation, photoWidth, photoHeight);
    imageDatas.add(imageData);
  }
}

/////////////////////////////////////////////////////////
//Pass the array of ImageData objects into the adapter
/////////////////////////////////////////////////////////
FluidGridAdapter fluidGridAdapter = new FluidGridAdapter(this, imageDatas){
  @Override
  protected void onSingleCellTapped(ImageData imageData) {
    Log.d(TAG,"Single cell tapped");
  }

  @Override
  protected void loadImageIntoView(String photoUrl, int cellWidth, int cellHeight, ImageView imageHolder) { 
    Picasso.with(context).load(photoUrl).resize(cellWidth, cellHeight).into(imageHolder);
  }
};
listview.setAdapter(fluidGridAdapter);

Compatible and tested with Android 4.0 and above.