now i create model using ArcMap and want to use it in my android app
Sounds like you have a model that is basically some geoprocessing steps. You could publish your model as a geoprocessing service and then consume the service in you app.
models are run as model tools from toolboxes in arctoolbox or even arccatalog or even within other models. I suspect that one of those requirements isn't being met. If you app doesn't permit access to these, then I suspect it isn't possible to do so in the way you want
Running a model tool—Help | ArcGIS for Desktop
Running custom (model or script) tools in the background—Help | ArcGIS for Desktop
Integrating a model within a model—Help | ArcGIS for Desktop
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