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style="display:none"></iframe><![endif]--><div id="codesiteContent"><a name="gc-topnav-anchor"></a><div id="gc-topnav"> <h1>Android Platform Development Kit</h1> <ul class="gc-topnav-tabs"> <li id="sdk_link"> <a href="http://code.google.com/android/index.html" title="Android Software Development Kit">SDK</a> </li> <li id="docs_link"> <a href="index.html" title="Official Android documentation">Docs</a> </li> <li id="faq_link"> <a href="http://code.google.com/android/kb/index.html" title="Answers to frequently asked questions about Android">FAQ</a> </li> <li> <a href="http://android-developers.blogspot.com/" title="Official Android blog">Blog</a> </li> <li> <a href="http://code.google.com/android/groups.html" title="Android developer forum">Group</a> </li> <li> <a href="http://code.google.com/android/terms.html" title="Android terms of service">Terms</a> </li> <li> <a href="mailto:android-pdk-feedback@google.com?subject=PDK%20Feedback&body=(filed%20from:%20telephony.html%20v0.6%20-%2025%20November%202008)%0D%0A%0D%0ASUMMARY:%0D%0A%0D%0A%0D%0A%0D%0ASTEPS%20TO%20REPRODUCE:%0D%0A%0D%0A%0D%0A%0D%0AADDITIONAL%20NOTES:">Report a Problem</a> </li> </ul></div><!-- end gc-topnav --><div class="g-section g-tpl-180"><a name="gc-toc"></a><div class="g-unit g-first" id="gc-toc"> <ul> <li> <h1><a href="index.html">Documentation</a></h1> <ul> <li> <strong>Introduction</strong> <ul> <li><a href="system_requirements.html">Device Requirements</a></li> </ul> </li> <li> <strong>Dev Environment Setup</strong> <ul> <li><a href="build_system.html">Build System</a></li> </ul> </li> <li> <strong>Basic Bring up</strong> <ul> <li><a href="build_new_device.html">Building New Device</a></li> <li><a href="bring_up.html">Bring up</a></li> <li><a href="keymaps_keyboard_input.html">Keymaps and Keyboard</a></li> <li><a href="display_drivers.html">Display Drivers</a></li> </ul> </li> <li> <strong>Multimedia</strong> <ul> <li><a href="audio_sub_system.html">Audio</a></li> <li><a href="camera.html">Camera</a></li> </ul> </li> <li> <strong>Power Management</strong> <ul> <li><a href="power_management.html">Power Management</a></li> </ul> </li> <li> <strong>Networking</strong> <ul> <li><a href="wifi.html">Wi-Fi</a></li> <li><a href="gps.html">GPS</a></li> <li><a href="bluetooth.html">Bluetooth</a></li> </ul> </li> <li> <strong>Telephony</strong> <ul> <li><a href="telephony.html">Radio Interface Layer</a></li> </ul> </li> <li> <strong>Testing</strong> <ul> <li><a href="instrumentation_testing.html">Instrumentation Testing</a></li> </ul> </li> </ul> </li> </ul></div><a name="gc-pagecontent"></a><div class="g-unit" id="gc-pagecontent"><div id="jd-content"><div class="jd-descr"><a name="androidPowerTelephony"></a><h1>Radio Layer Interface</h1><a name="toc"/><div style="padding:10px"><a href="#androidTelephonyIntro">Introduction</a><br/><a href="#androidTelephonyRILInitialization">RIL Initialization</a><br/><a href="#androidTelephonyRILIntro">RIL Interaction</a><br/><div style="padding-left:40px"><a href="#androidTelephonyRILSolicited">Solicited</a><br/><a href="#androidTelephonyRILUnsolicited">Unsolicited</a><br/></div><a href="#androidTelephonyRILImplementing">Implementing the RIL</a><br/><div style="padding-left:40px"><a href="#androidTelephonyRILInit">RIL_Init</a><br/></div><a href="#androidTelephonyRILFunctions">RIL Functions</a><br/><div style="padding-left:40px"><a href="#androidRilFunctionsSolicited">RIL Solicited Command Requests</a><br/><a href="#androidRilFunctionsUnsolicited">RIL Unsolicited Commands</a><br/></div></div></font></div><a name="androidTelephonyIntro"></a><h2>Introduction</h2><p>Android's Radio Interface Layer (RIL) provides an abstraction layer between Android telephony services (<a href="http://code.google.com/android/reference/android/telephony/package-descr.html">android.telephony</a>) and radio hardware. The RIL is radio agnostic, and includes support for Global System for Mobile communication (GSM)-based radios. </P><p>The diagram below illustrates the RIL in the context of Android's Telephony system architecture.</p><p><img src="telephony.gif"></p>Solid elements represent Android blocks and dashed elements represent partner-specific blocks.<p>The RIL consists of two primary components:</p><p><ul><li><b>RIL Daemon</b>: The RIL daemon initializes the Vendor RIL, processes all communication from Android telephony services, and dispatches calls to the Vendor RIL as solicited commands.</li><li><b>Vendor RIL</b>: The radio-specific Vendor RIL of <code>ril.h</code> that processes all communication with radio hardware and dispatches calls to the RIL Daemon (<code>rild</code>) through unsolicited commands.</li></ul></p><a name="androidTelephonyRILInitialization"></a><h2>RIL Initialization</h2><p>Android initializes the telephony stack and the Vendor RIL at startup as described in the sequence below:</p>⌨️ 快捷键说明
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