android - Intent.ACTION_HEADSET_PLUG 的状态 extra 总是返回 1

Question

我正在使用 BroadcastReceiver 来了解耳机是否已插入设备，但在任何情况下“状态” Intent 都会立即返回 1(已插入)。

这是我的代码:

public class Class {

  boolean isHeadsetOn;
  IntentFilter headsetReceiverFilter;
  HeadsetPluggedReceiver headsetReceiver;

  public Class(Context context) {
    this.headsetReceiverFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
    this.headsetReceiver = new HeadsetPluggedReceiver();
    context.registerReceiver(this.headsetReceiver, this.headsetReceiverFilter);
  }

  private class HeadsetPluggedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
      switch(intent.getIntExtra("state", -1)) {
        case 0:
          Synthesizer.this.isHeadsetOn = false;
          Log.d("onreceive", "off");
        case 1:
          Synthesizer.this.isHeadsetOn = true;
          Log.d("onreceive", "on");
        default:
          // shit
      }
    }

  }

}

这是我的日志:

// not plugged. plugging in
onreceive | on
// unplugging
onreceive | off
onreceive | on
// plugging in again
onreceive | on
// plugging off again
onreceive | off
onreceive | on

我该如何解决这个问题？

提前谢谢你。

Answer 1

您需要在 switch case 中使用 break 语句。现在您的逻辑正在落入案例 1。