java - 应用程序关闭时，服务中的 BroadcastReceiver 无法正常工作

Question

我正在创建一个应用程序，该应用程序有一个图像按钮，单击该按钮即可启动服务。该服务包含一个处理程序，我将其用作 24 小时计时器。服务启动后，该按钮将被禁用，因此无法再次单击。然后，当时间到了时，按钮将再次启用。在应用程序完全关闭之前，这一切都运行良好。如果应用程序完全关闭，服务将继续正常运行，除非广播接收器出现问题。如果应用程序关闭然后重新打开，即使服务已经在运行，也可以单击启动服务的按钮。我不确定为什么即使服务仍在运行，应用程序重新打开时也会启用该按钮。

这是我的服务的代码:

public class SetupTimerPC1 extends Service
{
Handler handler;
Database data;
Intent i, result;
runGraphics runG;
int bucketLevel = 1, bucketExpTotal = 0, totalWater = 0, bucketExp = 0;
float waterAmt = 0;
int timerCount = 0;
Notification notify;
Notification.Builder builder;
NotificationManager notificationManager;
PendingIntent pendingIntent;
@Override
public IBinder onBind(Intent intent) 
{
    return null;
}//end onBind function

@Override
public void onRebind(Intent intent)
{
    super.onRebind(intent);
}//end onRebing

@Override
public boolean onUnbind(Intent intent)
{
    return true;
}//end onUnbind

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

    //setup 24 hour timer
    handler = new Handler(Looper.getMainLooper());
    handler.postDelayed(runnable, 2000); //600000 -> wait ten minutes then call runnable
}//end onCreate function

private Runnable runnable = new Runnable()
{
    public void run()
    {
        //get current bucket exp
        data = new Database(SetupTimerPC1.this);
        data.open();
        bucketExp = data.getBucketExp();
        data.close();

        //check experience for current level
        if (bucketExp < 3000)
        {
            bucketLevel = 1;
        }//end if
        else if (bucketExp > 3000 && bucketExp < 6000)
        {
            bucketLevel = 2;
        }//end else if
        else if (bucketExp > 6000 && bucketExp < 9000)
        {
            bucketLevel = 3;
        }//end else if
        else if (bucketExp > 9000 && bucketExp < 12000)
        {
            bucketLevel = 4;
        }//end else if
        else if (bucketExp > 12000)
        {
            bucketLevel = 5;
        }//end else if

        //give resource based on level
        if (bucketLevel == 1)
        {
            waterAmt += .2;
            bucketExp += 1;
        }//end if
        else if (bucketLevel == 2)
        {
            waterAmt += .4;
            bucketExp += 2;
        }//end else if
        else if (bucketLevel == 3)
        {
            waterAmt += .6;
            bucketExp += 3;
        }//end else if
        else if (bucketLevel == 4)
        {
            waterAmt += .8;
            bucketExp += 4;
        }//end else if
        else if (bucketLevel == 5)
        {
            waterAmt += 1.0;
            bucketExp += 5;
        }//end else if
        timerCount++;
        if (timerCount < 5)//144
        {
            handler.postDelayed(runnable, 2000); //600000
        }//end if
        else
        {
            //pull data
            data = new Database(SetupTimerPC1.this);
            data.open();
            bucketExpTotal = data.getBucketExp();
            totalWater = data.getWaterAmt();
            data.close();

            //add new data to old
            bucketExpTotal += bucketExp;
            totalWater += (int)waterAmt;

            //push data
            data.open();
            data.bucketExpEntry(bucketExpTotal);
            data.waterAmountEntry(totalWater);
            data.bucketLevelEntry(bucketLevel);
            data.close();

            //send notification that resources have been gained
            notifyUser();

            i.putExtra("polarCap1Stat", true);
            LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(i);
            handler.removeCallbacks(runnable);
        }//end else
    }//end run function
};//end runnable    

public void notifyUser()
{
    //notify user of resource gain 
    result = new Intent(this, runGraphics.class);
    pendingIntent = PendingIntent.getActivity(
        SetupTimerPC1.this, 
        0, 
        result, 
        Intent.FLAG_ACTIVITY_NEW_TASK);

    notify = new Notification.Builder(getApplicationContext())
         .setContentTitle("2023: Water Gained")
         .setContentText("Successfully extracted water.")
         .setTicker("2023")
         .setWhen(System.currentTimeMillis())
         .setContentIntent(pendingIntent)
         .setDefaults(Notification.DEFAULT_SOUND)
         .setAutoCancel(true)
         .setSmallIcon(R.drawable.alienicon)
         .build();

        notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0, notify);
}//end notifyUser

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
    i = new Intent("polarCap1Status");
    i.putExtra("polarCap1Stat", false);
    LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(i);
    return Service.START_STICKY;
}//end onStartCommand function

}//结束SetupTimerPC1类

以下是从 BroadcastReceiver 接收 boolean 值的按钮的代码:

    //setup image buttons
    polarCap1 = (ImageButton) findViewById(R.id.polarCapButton1);
    polarCap1.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {   
            Toast.makeText(getApplicationContext(), "Attempting to Gain Resources", Toast.LENGTH_SHORT).show();

            if (polarCap1.isEnabled() && appSound)
            {
                water = new SoundPool(2, AudioManager.STREAM_MUSIC, 0);
                playSound = water.load(runGraphics.this, R.raw.watersound, 1);

                //play water sound
                water.setOnLoadCompleteListener(new OnLoadCompleteListener()
                {

                    @Override
                    public void onLoadComplete(SoundPool soundPool,
                            int sampleId, int status) 
                    {
                        water.play(playSound, 1, 1, 0, 0, 1);
                    }//end onLoadComplete

                });//end setOnLoadCompleteListener
            }//end if

            //button cannot be clicked
            polarCap1.setEnabled(false);

            //start service for timer
            startService(new Intent(runGraphics.this, SetupTimerPC1.class));

            //stop service for timer
            //stopService(new Intent(runGraphics.this, SetupTimerPC1.class));

            //broadcast receiver to allow button to be clicked again
            mMessageReceiver1 = new BroadcastReceiver()
            {
                @Override
                public void onReceive(Context context, Intent intent) 
                {
                    clickOnOff1 = intent.getBooleanExtra("polarCap1Stat", false);
                    polarCap1.setEnabled(clickOnOff1);
                    updateScores();
                }//end onReceive function
            };
            LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(mMessageReceiver1, new IntentFilter("polarCap1Status"));
        }//end onClick function         
    });//end setOnClickListener

非常感谢您的帮助。

Answer 1

如果您想保留正在做的事情，可以添加此代码以使用 isMyServiceRunning(SetupTimerPC1.class) 在 onCreate() 中检查服务的状态。如果它正在运行，那么您可以禁用该按钮:

private boolean isMyServiceRunning(Class<?> serviceClass) {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
    if (serviceClass.getName().equals(service.service.getClassName())) {
        return true;
    }
}
return false;
}