Try Freehand Mind Mapping With MindBoard Free
MindBoard Free is a nice mind mapping application for Android devices. The app allows you to create mind maps through freehand drawing and or by typing on the screen. All of the mind maps that you create in MindBoard Free can be saved to your Google Drive account. Once the mind map is in your Google Drive account you can open it on any other device. One of the more thoughtful features of MindBoard Free is palm-input rejection which rejects accidental input from brushing your palm on the screen while writing. See MindBoard Free in action in the video below (the video does not have sound).