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In manifiest.xml

<div class="post-text" style="background-color: white; border: 0px; margin: 0px 5px 5px 0px; padding: 0px; vertical-align: baseline; width: 660px;"><pre class="default prettyprint" style="background-color: #eeeeee; border: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; font-size: 14px; line-height: 18px; margin-bottom: 10px; max-height: 600px; overflow: auto; padding: 5px; vertical-align: baseline; width: auto;"><uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
</pre>In activity code:</div><div class="post-text" style="background-color: white; border: 0px; margin: 0px 5px 5px 0px; padding: 0px; vertical-align: baseline; width: 660px;">
<div><pre class="default prettyprint" style="background-color: #eeeeee; border: 0px; color: black; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; margin-bottom: 10px; max-height: 600px; overflow: auto; padding: 5px; vertical-align: baseline; width: auto;"> AudioManager am = (AudioManager)getSystemService(AUDIO_SERVICE);
 Log.i("am.isWiredHeadsetOn()", am.isWiredHeadsetOn()+"")</pre>Source</div></div>