Detect whether headset has microphone

问题

I need to detect whether the plugged in wired headset has microphone or not.

I can check if a headset is plugged in using isWiredHeadSetOn(), but for microphone does not seem to be such a method in AudioManager class.

I have found some suggestions using ACTION_HEADSET_PLUG, but I am interested to find out this information even if the headset has been plugged in before opening my application, this event won't be fired during the lifetime of my app.

Any ideas regarding this issue? Thank you in advance.

回答1:

UPDATE: Go ahead and register ACTION_HEADSET_PLUG in your activity's onResume(). If user has ever plugged in/out her headset after boot-up, platform will deliver the latest state to your activity when it resumes.

Following test code worked:

package com.example.headsetplugtest;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;

public class HeadSetPlugIntentActivity extends Activity {

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (Intent.ACTION_HEADSET_PLUG.equals(action)) {
                Log.d("HeadSetPlugInTest", "state: " + intent.getIntExtra("state", -1));
                Log.d("HeadSetPlugInTest", "microphone: " + intent.getIntExtra("microphone", -1));
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    protected void onResume() {
        super.onResume();

        IntentFilter filter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
        getApplicationContext().registerReceiver(mReceiver, filter);
    }

    @Override
    protected void onStop() {
        super.onStop();

        getApplicationContext().unregisterReceiver(mReceiver);
    }
}

来源：https://stackoverflow.com/questions/14708636/detect-whether-headset-has-microphone