This library has the base architecture for making Facebook's chathead like UI. Though drawing over other apps is becaming a common feature, there are no good guides or libraries for easily implementing this behavior. This library intends to be a good usable API for developing such applications. We have consolidated all the effort and experience gained from making the Define app. The feature set this library offers is not yet exhaustive. But this would be a good starting point.
The sample in the project is more for testing purposes than demonstration. Do have a look at the source code of Define to see how this library can be used effectively in a production app.
Using the library
The library is hosted in jcenter gradle dependency:
Copyright 2015 Workarounds Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.