Hi ganye
specific i.MX documentation is included in android doc bundle
http://www.nxp.com/webapp/Download?colCode=IMX6_M6.0.1_2.1.0_ANDROID_DOCS&Parent_nodeId=133769948107...
there is no general android porting guide, one can refer to common android developers resources.
As android is based on linux, it may be useful to check linux porting guide included in
linux doc bundle
http://www.nxp.com/webapp/Download?colCode=L4.1.15_1.1.0_LINUX_DOCS&Parent_nodeId=133769948107170617...
Best regards
igor
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