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在我的 android 项目中，我的两台设备相互配对。我想通过蓝牙将文件从一台设备发送到另一台设备，当自动或手动接收到该文件时，该设备上的我的应用程序需要读取该文件并根据它执行一些操作。

我创建了一项服务，其 OnCreate 方法为 CONNECTION_STATE_CHANGED 注册了一个广播侦听器。此服务在我的主要活动的 OnCreate 方法中启动。所以即使我的应用程序不在前端，这个广播接收器也会读取文件并执行所需的操作。首先，这是正确的做法吗？如果是，请告诉我怎么做？

以下是我注册广播接收器的服务文件。当我运行此代码并接收文件时，没有调用广播接收器的 OnReceive。

package com.android;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class FileReceiver extends Service {

    private static final String ACTION = "android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED";

//    private BroadcastReceiver   BT_CONNECTION_BCAST_Receiver;
@Override
public IBinder onBind(Intent arg0) {
    return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.i("LocalService", "Received start id " + startId + ": " + intent);
    // We want this service to continue running until it is explicitly
    // stopped, so return sticky.
    return START_STICKY;
}

@Override
public void onCreate() {
    super.onCreate();

    final IntentFilter theFilter = new IntentFilter();
    theFilter.addAction(ACTION);

    Log.i("LocalService", "On created ");




    // Registers the receiver so that your service will listen for broadcasts
    this.registerReceiver(this.btReceiver_Receiver, theFilter);
}

private final BroadcastReceiver btReceiver_Receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        // Do whatever you need it to do when it receives the broadcast
        // Example show a Toast message...
        String action = intent.getAction();
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        Log.i("BT_Connection", "Inside Receiver");

        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            Log.i("BT_Connection", "Device Found");
         }

        if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) 
        {
            Log.i("BT_Connection", "On BT Connection");

        }


        Log.i("LocalService", "On Broadcast Receiver");

        showSuccessfulBroadcast();
    }
};
@Override
public void onDestroy() {
    super.onDestroy();
    Log.i("LocalService", "On Being Destroyed!!");

    // Do not forget to unregister the receiver!!!
    this.unregisterReceiver(this.btReceiver_Receiver);
}

private void showSuccessfulBroadcast() {
    Toast.makeText(this, "Broadcast Successful!!!", Toast.LENGTH_LONG).show();
}
}
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