Detecting whether a headset is plugged into an Android device or not.

Question

How can I determine whether a headset is plugged into an Android device or not?

Answer 1

You can use the broadcast receiver.

So, You might write this code in "AndroidManifest.xml"

<receiver android:name="com.juno.brheadset.HeadsetStateReceiver">     <intent-filter>         <action android:name="android.intent.action.HEADSET_PLUG"/>     </intent-filter> </receiver>--> 

But, This doesn't work. When OS send this "HEADSET_PLUG" intent, OS set the flag "Intent.FLAG_RECEIVER_REGISTERED_ONLY" So, You should write the code like below in Activity or Service class instead of "AndroidManifest" things.

public class BRHeadsetActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      IntentFilter receiverFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);     HeadsetStateReceiver receiver = new HeadsetStateReceiver();     registerReceiver( receiver, receiverFilter );   } 

I hope this article help you. Bye!

This is the part of "HeadsetObserver.java", Android SDK Source.

private final void sendIntent(int headset, int headsetState, int prevHeadsetState, String headsetName) {     if ((headsetState & headset) != (prevHeadsetState & headset)) {         //  Pack up the values and broadcast them to everyone         Intent intent = new Intent(Intent.ACTION_HEADSET_PLUG);          **intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);**          int state = 0;         int microphone = 0;          if ((headset & HEADSETS_WITH_MIC) != 0) {             microphone = 1;         }         if ((headsetState & headset) != 0) {             state = 1;         }         intent.putExtra("state", state);         intent.putExtra("name", headsetName);         intent.putExtra("microphone", microphone);          if (LOG) Slog.v(TAG, "Intent.ACTION_HEADSET_PLUG: state: "+state+" name: "+headsetName+" mic: "+microphone);         // TODO: Should we require a permission?         ActivityManagerNative.broadcastStickyIntent(intent, null);     } }