ril

问题 I'm trying to write an app to talk to the rild. And Yes, I know this is not politically correct, but it's an embedded industrial telemetry app so I'm not concerned about user experience, portability and all that stuff. The problem is that when I try to connect, I get a java.io "Permission denied" exception. Can anybody help me? The phone (Nexus One) is rooted with Cyanogenmod 7 and the app is running as superuser using the "SuperUser" app from Market. My Code (abbreviated): try { mSocket =

问题 I am trying to connect external GSM modem with nexus 5 and send AT command using android RIL layer.I am using android 5.0 AOSP for nexus 5 downloaded from Google source. Error: Permission denied with trying to open ttyACM0 port. i have checked this by changing permissions but still permission denied error. Does there any other permissions do i have to change to open port? 回答1: You are getting permission denied because the Android RIL doesn't have the appropriate selinux(Security Enhanced

问题 Following Microsoft's documentation on RIL I've been able to implement a code that retrieves Cell ID, LAC, MCC, MNC and Signal Strength. Using these data and http://www.opencellid.org/ I'm able to retrieve latitude and longitude of that cell tower. The problem is that I need to implement some kind of triangulation algorithm to get a more accurate position. But before even thinking in triangulation, I'm going to need more than one tower ID to work with. How can I get them? I tried to create an

问题 I would like to know high level idea of how Android Modem code will call/pass message to Android application layer. Say we take SMS for example. If network sends SMS and Modem (say Qualcomm C code parses it) how is it transmitted to Android Application layer? Is there always a JNI call happening? as interface between modem and Android? Can you please share the information with us. Thanks 回答1: In almost all android source base as found in the AOSP/CAF/CM source (Android Open Source Project,