A GUI editor to create and edit constraint-based layouts (source files)
The Auckland Layout Editor (ALE) is a constraint-based layout editor that is based on the BALMLayout layout class. The constraint-based layout model is very powerful and can describe layouts that can't be described with other layout models, like for example, the grid-bag layout model. Layouts created with ALE are automatically resizable and non-overlapping. This means while editing a layout you can't create a layout that has two overlapping views. Furthermore, layouts created with ALE have no conflicting constraints.
ALE provides a small but powerful set of edit operations. These edit operations keep views automatically aligned to each other. This makes creating and editing layouts very easy.
For more information read: