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copied!<p>Try looking at the <a href="http://www.netmite.com/android/mydroid/frameworks/base/media/java/android/media/AudioManager.java" rel="noreferrer">AudioManager source code</a>:</p> <pre><code>public void setMicrophoneMute(boolean on){ IAudioService service = getService(); try { service.setMicrophoneMute(on); } catch (RemoteException e) { Log.e(TAG, "Dead object in setMicrophoneMute", e); } } </code></pre> <p>The task of muting the microphone is delegated to a service named <a href="http://www.netmite.com/android/mydroid/frameworks/base/media/java/android/media/AudioService.java" rel="noreferrer">IAudioService</a>:</p> <pre><code>public void setMicrophoneMute(boolean on) { if (!checkAudioSettingsPermission("setMicrophoneMute()")) { return; } synchronized (mSettingsLock) { if (on != mMicMute) { AudioSystem.muteMicrophone(on); mMicMute = on; } } } </code></pre> <p>Which, in turn, delegates it to <a href="http://www.netmite.com/android/mydroid/cupcake/frameworks/base/media/java/android/media/AudioSystem.java" rel="noreferrer">AudioSystem</a> which seems to be implemented in <a href="http://www.netmite.com/android/mydroid/frameworks/base/media/libmedia/AudioSystem.cpp" rel="noreferrer">native code</a>:</p> <pre><code>status_t AudioSystem::muteMicrophone(bool state) { const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger(); if (af == 0) return PERMISSION_DENIED; return af->setMicMute(state); } </code></pre> <p>Which, in turn, delegates it to <a href="http://androidaudio.blogspot.com/2010/06/so-what-is-audioflinger.html" rel="noreferrer">IAudioFlinger</a> as can be found in <a href="http://www.netmite.com/android/mydroid/frameworks/base/media/libmedia/IAudioFlinger.cpp" rel="noreferrer">IAudioFlinger.cpp</a>:</p> <pre><code>virtual status_t setMicMute(bool state) { Parcel data, reply; data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor()); data.writeInt32(state); remote()->transact(SET_MIC_MUTE, data, &reply); return reply.readInt32(); } </code></pre>

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