android 判断耳机是否插入的几种方式

1.耳机插入和拔出时会发出广播ACTION_HEADSET_PLUG

 private final BroadcastReceiver mReceiver = new BroadcastReceiver() {      @Override      public void onReceive(Context context, Intent intent) {          String action = intent.getAction();          if (action.equals(Intent.ACTION_HEADSET_PLUG)) {              if(intent.hasExtra("state")) {                  if(intent.getIntExtra("state", 0) == 0) {                      Toast.makeText(context, "headset not connected", Toast.LENGTH_LONG).show();                  } else if(intent.getIntExtra("state", 0) == 1) {                      Toast.makeText(context, "headset connected", Toast.LENGTH_LONG).show();                  }              }          }      }  };

0：无插入，1：耳机和话筒均插入，2：仅插入话筒

2.在目录下读取状态

 private static final String HEADSET_STATE_PATH = "/sys/class/switch/h2w/state";  nbsp;private boolean isHeadsetExists() {      char[] buffer = new char[1024];      int newState = 0;      try {          FileReader file = new FileReader(HEADSET_STATE_PATH);          int len = file.read(buffer, 0, 1024);          newState = Integer.valueOf((new String(buffer, 0, len)).trim());      }      catch (FileNotFoundException e) {          Log.e("FMTest", "This kernel does not have wired headset support");      }      catch (Exception e) {          Log.e("FMTest", "", e);      }      return newState != 0;  }

3.第二种比较麻烦，其实android提供一个接口

AudioManager localAudioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);                  boolean isHeadSetOn = localAudioManager.isWiredHeadsetOn();                if(!isHeadSetOn){                    Toast.makeText(context, "请插入话筒", Toast.LENGTH_LONG).show();                    return;                }

不要忘了加上权限

 <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

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