Pari Pari - 1 year ago 88
Java Question

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;

public void onCreate(Bundle savedInstanceState) {
reminderService = new ReminderService("ReminderService");

TimePickerDialog dialog = new TimePickerDialog(this, mTimeSetListener, mHour, mMinute, false);;

TimePickerDialog.OnTimeSetListener mTimeSetListener = new OnTimeSetListener() {

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) {
// TODO Auto-generated constructor stub

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);

.setTicker("Local Notification Ticker")
.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=""
android:versionName="1.0" >

android:targetSdkVersion="15" />

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


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

Answer Source

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

public ReminderService() {

Explanation from the documentation:

The name is used to name the worker thread.

NOTE: this is only applicable to intent service.

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