在Android Oreo及以上版本中，由于后台限制的加强，使用AlarmManager和BroadcastReceiver需要进行一些特殊处理。以下是解决方法的示例代码：

1. 首先，在AndroidManifest.xml文件中添加以下权限和声明：

    ...
    
        
            
        
    
    ...

2. 创建BroadcastReceiver类，用于接收AlarmManager触发的广播：

public class YourBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 在此处处理AlarmManager触发的操作
    }
}

3. 在你的Activity或Service中设置AlarmManager，并确保在Android Oreo及以上版本中使用setExactAndAllowWhileIdle或setAndAllowWhileIdle方法：

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, YourBroadcastReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10000, pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    alarmManager.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10000, pendingIntent);
} else {
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10000, pendingIntent);
}

4. 在你的Activity或Service中注册和取消注册BroadcastReceiver：

public class YourActivity extends AppCompatActivity {
    private YourBroadcastReceiver broadcastReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        broadcastReceiver = new YourBroadcastReceiver();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            registerReceiver(broadcastReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
        } else {
            registerReceiver(broadcastReceiver, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(broadcastReceiver);
    }
}

通过以上步骤，你应该能够在Android Oreo及以上版本中正确使用AlarmManager和BroadcastReceiver。