java - 使用蓝牙服务时如何避免出现 "Are you missing a call to unregisterReceiver()?"错误？

Question

我收到以下错误:

12-02 13:35:55.990 10977-10977/com.example.btpdemo76 E/ActivityThread: Activity com.zkc.pinter.activity.MainActivity 已泄露 IntentReceiver com.zkc.helper.printer.BlueToothService$1@4179571最初是在这里注册的。您是否错过了对 unregisterReceiver() 的调用？ android.app.IntentReceiverLeaked:Activity com.zkc.pinter.activity.MainActivity 已泄露最初在此处注册的 IntentReceiver com.zkc.helper.printer.BlueToothService$1@4179571。您是否错过了对 unregisterReceiver() 的调用？ 在 android.app.LoadedApk$ReceiverDispatcher。(LoadedApk.java:1351) 在 android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:1132) 在 android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1421) 在 android.app.ContextImpl.registerReceiver(ContextImpl.java:1394) 在 android.app.ContextImpl.registerReceiver(ContextImpl.java:1382) 在 android.content.ContextWrapper.registerReceiver(ContextWrapper.java:609) 在 com.zkc.helper.printer.BlueToothService.ScanDevice(BlueToothService.java:87) 在 com.zkc.helper.printer.bt.BtService$2.run(BtService.java:86)

这是我的代码

公共(public)无效扫描(){

    if (!mBTService.IsOpen()) {
        mBTService.OpenDevice();
        return;
    }
    if (mBTService.getState() == STATE_SCANING)
        return;

    new Thread() {
        public void run() {
            mBTService.ScanDevice();  
        }
    }.start();
}









public void ScanDevice() {
    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    context.registerReceiver(mReceiver,  filter);  //showing error here

    filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    context.registerReceiver(mReceiver, filter);
    if (adapter.isDiscovering()) {
        adapter.cancelDiscovery();
    }
    setState(PrinterClass.STATE_SCANING);
    // Request discover from BluetoothAdapter
    adapter.startDiscovery();
}

Answer 1

当您动态添加接收器时，请记住在 onPause() 方法中取消注册同一接收器:

@Override
protected void onPause() {
   unregisterReceiver(mReceiver);
   super.onPause();
}

注意:不要将以上代码放在 onStop() 方法中，因为:

this method may never be called, in low memory situations where the system does not have enough memory to keep your activity's process running after its onPause() method is called.