CountDownTimerサービスが開かれたときにクラッシュする

Question

私はアプリから外したり画面を変更したりするとカウントダウンタイマー画面を作ろうとしています。なんらかの理由で、timeLeftがnullであると言ってクラッシュし続けます。カウントダウンクラスの時間変数があることがわかっている理由がわからないのです。助けてくれてありがとう！

カウントダウン活動

public class Countdown extends Activity { 
public static String time; 
public static String address; 
@Override 
protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_countdown); 
    Intent confIntent = getIntent(); 
    time = confIntent.getStringExtra("time"); 
    address = confIntent.getStringExtra("address"); 
    LocalBroadcastManager.getInstance(this).registerReceiver(
      new BroadcastReceiver() { 
       @Override 
       public void onReceive(Context context, Intent intent) { 
        TextView textView= findViewById(R.id.t1); 
        String timeLeftString = intent.getStringExtra("timeSent"); 
        int timeLeft = Integer.parseInt(timeLeftString); 
        if(timeLeft>0) { 
         textView.setText("You have " + timeLeft + " minutes left"); 
        } 
        else{ 
         textView.setText("Y'all outta time, see ya again soon!"); 
         killIt(); 
        } 
       } 
      }, new IntentFilter(CountdownService.ACTION_LOCATION_BROADCAST) 
    ); 
    Intent toService = new Intent(this, CountdownService.class); 
    startService(toService); 

} 
@Override 
protected void onResume() { 
    super.onResume(); 
    TextView textView= findViewById(R.id.t1); 
    textView.setText("You have " + CountdownService.toSend + " minutes left"); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 

} 

public void killIt(){ 
    stopService(new Intent(this, CountdownService.class)); 
} 


} 

カウントダウンサービス

public class CountdownService extends Service{ 
public static int toSend=0; 
public int time; 
public static final String 
     ACTION_LOCATION_BROADCAST = CountdownService.class.getName() + 
"LocationBroadcast"; 
public final String timeFromCD = Countdown.time; 
public final String address = Countdown.address; 

@Override 
public void onCreate() { 
super.onCreate(); 
    time = Integer.parseInt(timeFromCD); 
    time = time*60000; 
    new CountDownTimer(time, 5000) { 
     public void onTick(long millisUntilFinished) { 
      int timeLeftInt = (int) Math.ceil((double) millisUntilFinished/60000); //Whole number of minutes left, ceiling 
      sendBroadcastMessage(timeLeftInt); 
      toSend = timeLeftInt; 
      if(timeLeftInt == 5){ 
       Notify("Not Done"); 
      } 

     } 

     public void onFinish() { 
      sendBroadcastMessage(0); 
      Notify("done"); 

      Response.Listener<String> response = new Response.Listener<String>() { 
       @Override 
       public void onResponse(String response) { 
        try { 
         //creating a jsonResponse that will receive the php json 
         JSONObject jsonResponse = new JSONObject(response); 
         boolean success = jsonResponse.getBoolean("success"); 

         if (success) { 

         } else { 
          AlertDialog.Builder builder = new AlertDialog.Builder(CountdownService.this); 
          builder.setMessage("Login Failed") 
            .setNegativeButton("Retry", null) 
            .create() 
            .show(); 
         } 

        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 
       } 
      }; 

      SpotAmountRequest spotAmountRequest = new SpotAmountRequest(address, "0", response); 
      RequestQueue queue = Volley.newRequestQueue(CountdownService.this); 
      queue.add(spotAmountRequest); 

     } 
    }.start(); 

} 


private void sendBroadcastMessage(int timeSent) { 
     Intent intent = new Intent(ACTION_LOCATION_BROADCAST); 
     intent.putExtra("timeSent", timeSent); 
     LocalBroadcastManager.getInstance(this).sendBroadcast(intent); 

} 



@Override 
public IBinder onBind(Intent intent) { 
    return null; 
} 


private void Notify(String doneness){ 

    NotificationManager notificationManager = (NotificationManager) 
      getSystemService(NOTIFICATION_SERVICE); 

    Intent intent = new Intent(this, Map.class); 
    PendingIntent pIntent = PendingIntent.getActivity(this, (int) System.currentTimeMillis(), intent, 0); 
    if(doneness.equals("done")) { 
     Notification n = new Notification.Builder(this) 
       .setContentTitle("Time to leave!") 
       .setContentText("Your PrePark spot has expired, time to go home!") 
       .setSmallIcon(R.mipmap.ic_launcher) 
       .setContentIntent(pIntent) 
       .setAutoCancel(true) 
       .build(); 

     notificationManager.notify(0, n); 
     Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); 
     // Vibrate for 500 milliseconds 
     v.vibrate(1000); 
    } 

    else{ 
     Notification n = new Notification.Builder(this) 
       .setContentTitle("Ya got 5 minutes left in your PrePark spot!") 
       .setContentText("Better get going soon here") 
       .setSmallIcon(R.mipmap.ic_launcher) 
       .setContentIntent(pIntent) 
       .setAutoCancel(true) 
       .build(); 

     notificationManager.notify(0, n); 
    } 
} 


} 

Answer 1

あなたがサービスから放送している意図でint値を保存しているが、あなたはそれを取得しようとしていますブロードキャストを受信するStringとして発信します。受信者を変更してgetStringExtraの代わりにgetIntExtraを使用するか、をサービス内のStringに変換してから、インテントに保存してください。