You have to prepare offline data yourself:
(1)If image data, you have to use ArcGIS desktop 10.1(or more)runtime tool to create Titled Layer(*.tpk).
ArcGISLocalTiledLayer localTileLayer = new ArcGISLocalTiledLayer("tkp data path";);
map.addLayer(localTileLayer);
(2)Else if vector data, you have to use ArcGIS desktop 10.2 runtime toool to create runtime content(*.geodatabse).
Geodatabase localGdb = new Geodatabase(geodatabsePath);
for (GeodatabaseFeatureTable gdbFeatureTable : localGdb.getGeodatabaseTables()) {
if (gdbFeatureTable.hasGeometry())
mMapView.addLayer(new FeatureLayer(gdbFeatureTable));
}