HarmonyOS 鸿蒙Next系统升级后应用程序无法自启动

HarmonyOS 鸿蒙Next系统升级后应用程序无法自启动 各位大神急！！！！！！

我用android studio 写了个自启动的程序，开机监听广播后启动自身，代码如下：

package com.bridgescanapp.activity;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.AlarmManager;
import android.app.KeyguardManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.BatteryManager;
import android.os.Handler;
import android.os.PowerManager;
import android.os.SystemClock;
import com.bridgescanapp.NetWork;
import com.bridgescanapp.alarm.AlarmService;
import com.bridgescanapp.dao.DeviceInfo;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;
import static androidx.core.content.ContextCompat.getSystemService;
public class BootReceiver extends BroadcastReceiver {    
    BatteryManager batteryManager = null;
    private Handler handler = null;
    private Runnable runnable = null;
    void logAction(Context context,String string) throws IOException {
        File m_sdCardDir = context.getExternalFilesDir(null).getAbsoluteFile();
        File m_BuildDir_data = new File(m_sdCardDir, "/data/log");
        if(m_BuildDir_data.exists()==false)m_BuildDir_data.mkdirs();
        File datafile = new File(m_BuildDir_data, "/intent.txt");
        if (!datafile.exists()) { datafile.createNewFile(); }
        FileWriter fileWritter = new FileWriter(datafile.getAbsolutePath(),true);
        fileWritter.write("收到数据");
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(String.valueOf(new Date())).append(" ");
        stringBuilder.append(string);
        fileWritter.write(stringBuilder.toString());
        fileWritter.write(System.getProperty("line.separator"));
        fileWritter.close();
    }
    public static PendingIntent pendingIntent = null;
    public static AlarmManager alarmManager = null;
    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            logAction(context,intent.getAction());
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            for(int i=0;i<10;i++){
                Intent myIntent = new Intent(context, MainActivity.class);
                myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                pendingIntent = PendingIntent.getActivity(context, 0, myIntent, 0);
                alarmManager = (AlarmManager) context.getSystemService(Service.ALARM_SERVICE);
                alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,System.currentTimeMillis() + 1000 * 2 + i * 1000 * 2,pendingIntent);
                try {
                    logAction(context,"pendingIntent " + i + " " + pendingIntent.toString());
                    logAction(context,"alarmManager " + i + " " + alarmManager.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

这段代码，在华为P40手机 HarmonyOS 系统版本 2.0.0.245上正常自启动！！！

但是手机升级后 HarmonyOS 系统版本2.0.0.273及系统版本2.0.1.262都无法自启动了，debug也没有看到错误信息，请各位大神帮忙看看怎么解决!

感激不尽