There is no publicly available tool specifically named "Android Material Theme Generator" that can directly generate a complete Material Theme for a "Task Manager" app based on provided data. The creation of a Material Theme requires design choices and specifications beyond what a simple generator could handle. A true Material Theme involves selecting colors, typography, shapes, and other stylistic elements to create a cohesive and branded look and feel. This is typically a design process, not a purely automated one.

To create a Material Theme for a Task Manager Android app, you would need to use Android Studio and leverage its built-in tools and resources. You would define your theme in an XML file (typically styles.xml within your res/values directory) specifying colors, typography, and other attributes according to Material Design guidelines. There are no automated tools that can replace this design and implementation process.