广播与线程问题通过广播监测网络连接从而控制手机自动重启时，连接上网络后无法取消重启

需求：手机没有网络后，延时30秒，假如手机还没有网络那么立即重启，30秒过程中一旦连上网络则取消重启。
思路1：通过广播监控网络连接状态，手机网络断开之后启动IntentService，通过子线程来延时30秒，之后重启。此方法需要在广播中将网络连接参数传入service，本人只知道通过intent然后startService传给service，但是由于联网与断网需要传两次，因此使用两次startService会新建单独的子线程，经过实验，第一个子线程30秒重启完毕之后才会新建第二条子线程，因此这个方法没有成功。
思路2：在service中接收广播，但是不知道什么原因，由联网切换到断网或由断网切换到联网的时候，切换后的状态并不会执行，例如断网30秒的时候会重启，但是30秒内连上网络，联网的代码并不会得到执行。
思路3：舍弃service，在activity中接收广播，通过断网设定断网变量，联网设置联网变量，通过判断变量的值来重启或取消。可惜本人在断网延时30秒然后重启，在30秒未到的时候联网，然而断网状态下的代码会执行完毕，不能取消重启

package com.riying.introduce.testo;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.BatteryManager;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity{
    private static String TAG="##################";
   /* private NetworkChangeReceiver networkChangeReceiver;*/
    private Dialog dialog;
    private Intent startservice=null;
    private int batteryChange;
    private int netChange;
    private int noNetChange;
    private int a;
    private IntentFilter intentFilter;
    private NetworkChangeReceiver networkChangeReceiver;
    private BatteryChangeReceiver batteryChangeReceiver;
    int level;
    int scale;
    int total;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
           /*充电状态检测*/
        batteryChangeReceiver=new BatteryChangeReceiver();
        registerReceiver(batteryChangeReceiver,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
             /*网络监测*/
        intentFilter=new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        networkChangeReceiver=new NetworkChangeReceiver();
        registerReceiver(networkChangeReceiver,intentFilter);
        
    }
    @Override
    protected void onDestroy() {
        unregisterReceiver(networkChangeReceiver);
        unregisterReceiver(batteryChangeReceiver);
        super.onDestroy();
        /*unregisterReceiver(networkChangeReceiver);*/
    }
    class BatteryChangeReceiver extends BroadcastReceiver{
        private static final String TAG = "##";
        /*   private PowerManager pm=null;
           private PowerManager.WakeLock wakeLock=null;*/
        @Override
        public void onReceive(final Context context, Intent intent) {
            String action=intent.getAction();
            level=intent.getIntExtra("level",0);
            scale=intent.getIntExtra("scale",0);
            total=(level*100)/scale;
            if (Intent.ACTION_BATTERY_CHANGED.equals(action)){
                int status=intent.getIntExtra("status", BatteryManager.BATTERY_HEALTH_UNKNOWN);
                if (status==BatteryManager.BATTERY_STATUS_CHARGING||total==100){
                    Log.e(TAG,"--正在充电");
                    batteryChange=1;
                }else {
                    Log.e(TAG,"电源已断开");
                    batteryChange=0;
                }
            }
        }
    }
    class NetworkChangeReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager connectivityManager=(ConnectivityManager)context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
            /*根据网络状态弹出对话框*/
            if (networkInfo!=null&&networkInfo.isAvailable()){
                noNetChange=1;
                if (batteryChange==0){
                    Log.e("无电有网","休眠"+"\t网络状态"+noNetChange+"\t电池状态"+batteryChange+"\t"+total+"\t"+level+"\t"+scale);
                }else{
                    Log.e("有电有网","休眠"+"\t网络状态"+noNetChange+"\t电池状态"+batteryChange+"\t"+total+"\t"+level+"\t"+scale);
                }
            }else {
                noNetChange=0;
                if (batteryChange==1){
                    Log.e("有电无网","重启"+"\t网络状态"+noNetChange+"\t电池状态"+batteryChange+"\t"+total+"\t"+level+"\t"+scale);
                    reStart();
                }else {
                    Log.e("无电无网","休眠"+"\t网络状态"+noNetChange+"\t电池状态"+batteryChange+"\t"+total+"\t"+level+"\t"+scale);
                }
            }
            Log.e("#######","\t网络状态"+noNetChange+"\t电池状态"+batteryChange);
        }
    }
    private void reStart(){
        long time= SystemClock.currentThreadTimeMillis();
        while (SystemClock.currentThreadTimeMillis()-time<=20000){
            Log.e("时间差",SystemClock.currentThreadTimeMillis()-time+"\t网络状态"+noNetChange+"\t电池状态"+batteryChange);
            if (SystemClock.currentThreadTimeMillis()-time==10000){
                Log.e("时间差为10秒",SystemClock.currentThreadTimeMillis()-time+"--10秒");
                Log.e("reStart","网络状态"+noNetChange+"电池状态"+batteryChange);
                try {
                    Log.e(TAG,"broadcast->shutdown");
                    java.lang.Process process=Runtime.getRuntime().exec(new String[]{"su","-c","reboot"});
                    process.wait();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            }
        }
    }
}