No empty constructor when create a service

I am struggling with this error:

> 08-08 11:42:53.179: E/AndroidRuntime(20288): Caused by: java.lang.InstantiationException: can't instantiate class com.example.localnotificationtest.ReminderService; no empty constructor

I don't understand why this error occurs.

I am trying to appear notification at specific time and after searching for a time i found this old stackoverflow question. I tried everything but my code gives error.

Please help me to solve this problem.

Here is my MainActivity code:

public class MainActivity extends Activity {
	int mHour, mMinute;
	ReminderService reminderService;
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        reminderService = new ReminderService("ReminderService");
        
        TimePickerDialog dialog = new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, false);
        dialog.show();
    }
	
	TimePickerDialog.OnTimeSetListener mTimeSetListener =  new OnTimeSetListener() {
		
		@Override
		public void onTimeSet(TimePicker v, int hourOfDay, int minute) {
			mHour = hourOfDay;
			mMinute = minute;

			AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
			Calendar c = Calendar.getInstance();
			c.set(Calendar.YEAR, Calendar.YEAR);
			c.set(Calendar.MONTH, Calendar.MONTH);
			c.set(Calendar.DAY_OF_MONTH, Calendar.DAY_OF_MONTH);
			c.set(Calendar.HOUR_OF_DAY, mHour);
			c.set(Calendar.MINUTE, mMinute);
			c.set(Calendar.SECOND, 0);
			
			long timeInMills = c.getTimeInMillis();
			
			Intent intent = new Intent(MainActivity.this, ReminderService.class);
			PendingIntent pendingIntent = PendingIntent.getService(MainActivity.this, 0, intent, 0);
			alarmManager.set(AlarmManager.RTC, timeInMills, pendingIntent);
		}
	};
    
}

and here is my ReminderService code:

public class ReminderService extends IntentService {

	public ReminderService(String name) {
		super(name);
		// TODO Auto-generated constructor stub
	}

	@Override
	protected void onHandleIntent(Intent intent) {
		
		Intent notificationIntent = new Intent(this, MainActivity.class);
		PendingIntent contentIntent = PendingIntent.getActivity(this, 1, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

		NotificationManager nm = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

		Notification.Builder builder = new Notification.Builder(this);

		builder.setContentIntent(contentIntent)
			.setSmallIcon(R.drawable.ic_launcher)
			.setTicker("Local Notification Ticker")
		 	.setWhen(System.currentTimeMillis())
		 	.setAutoCancel(true)
		 	.setContentTitle("Local Notification")
		 	.setContentText("This is content text.");
		 Notification n = builder.getNotification();

		 nm.notify(1, n);
	}

}

and here is my manifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.localnotificationtest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"  android:label="@string/app_name"  android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity"  android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name="ReminderService"></service>
    </application>

</manifest>

I don't know where I am going wrong. Am I missing some code?

You need to add an empty constructor to your class i.e. one that takes no arguments:

public ReminderService() {
    super("ReminderService");
}

Explanation from the documentation:

The name is used to name the worker thread.

NOTE: this is only applicable to intent service.

If you have your Service declared as an Inner Class / Nested Class, you also need to make the class static

Without that you´ll get the error even if your constructor is correct

> Explanation > > The reason for that is, you can only instantiate inner classes in the > context of the outer class, so you would need to create an instance of > the outer class first. > > Declaring your inner class static makes it independent from its outer class

Declare a default no-argument constructor for IntentService

public class ReminderService extends IntentService {
    public ReminderService() {
      super("ReminderService");
    }
}

You need to add the default no-argument constructor to your ReminderService class. This is only implicitly added if you don't write a constructor of your own (which you have). See here: http://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html