Android Alarm Manager with Time and Date Picker

Question

I'm working on an app in which I need the user to schedule an event. I am using TimePicker and DatePicker Dialogs to set the time of the event and an AlarmManager with a BroadcastReceiver to execute the action when the time is reached. On testing I have come to a conclusion that my time and date picker dialogs are working fine and I am able to pick a date and time. However the BroadcastReceiver isn't being triggered by the AlarmManager when the time is reached.

Here is my MainActivity.class that schedules the event:

public class MainActivity extends Activity {

Button setTime;
Button scheduleEvent;
static final int DATEPICKER_DIALOG_ID = 0;
static final int TIMEPICKER_DIALOG_ID = 1;
int dpYear, dpMonth, dpDay, tpHour, tpMinute;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final Calendar calendar = Calendar.getInstance();
    dpYear = calendar.get(Calendar.YEAR);
    dpMonth = calendar.get(Calendar.MONTH);
    dpDay = calendar.get(Calendar.DAY_OF_MONTH);
    tpHour = calendar.get(Calendar.HOUR_OF_DAY);
    tpMinute = calendar.get(Calendar.MINUTE);

    setTime = (Button) findViewById(R.id.button1);
    scheduleEvent = (Button) findViewById(R.id.button2);

    setTime.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showDialog(DATEPICKER_DIALOG_ID);
        }
    });

    scheduleEvent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent intent = new Intent("com.ohs.example.myEvent");
            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager alarmMgr = (AlarmManager) (this.getSystemService(Context.ALARM_SERVICE));

            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.YEAR, dpYear);
            cal.set(Calendar.MONTH, dpMonth);
            cal.set(Calendar.DAY_OF_MONTH, dpDay);
            cal.set(Calendar.HOUR_OF_DAY, tpHour);
            cal.set(Calendar.MINUTE, tpMinute);
            cal.set(Calendar.SECOND, 0);
            long mills = cal.getTimeInMillis();

            alarmMgr.set(AlarmManager.RTC_WAKEUP, mills, pendingIntent);
            Toast.makeText(this, "Event scheduled at " + tpHour + ":" + tpMinute + " " + dpDay + "/" + dpMonth + "/" + dpYear, Toast.LENGTH_LONG).show();

        }
    });

}

@Override
protected Dialog onCreateDialog(int id) {
    if (id == DATEPICKER_DIALOG_ID) {
        return new DatePickerDialog(this, datePickerListener, dpYear, dpMonth, dpDay);
    } else if (id == TIMEPICKER_DIALOG_ID) {
        return new TimePickerDialog(this, timePickerListener, tpHour, tpMinute, false);
    } else {
        return null;
    }
}

private DatePickerDialog.OnDateSetListener datePickerListener =
        new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
                dpYear = i;
                dpMonth = i1 + 1;
                dpDay = i2;
                showDialog(TIMEPICKER_DIALOG_ID);
            }
        };

protected TimePickerDialog.OnTimeSetListener timePickerListener =
        new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker timePicker, int i, int i1) {
                tpHour = i;
                tpMinute = i1;
            }
        };
}

AlarmReceiver.class:

public class AlarmReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    Toast.makeText(context, "Broadcast Received", Toast.LENGTH_LONG).show();
    eventMethod();

}

protected void eventMethod() {

//Do something...

}
}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ohs.example" >

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name=".AlarmReceiver" android:enabled="true">
        <intent-filter>
            <action android:name="com.ohs.example.myEvent" />
        </intent-filter>
    </receiver>
</application>

</manifest>

I have previously worked on other apps where I had to set a repeating alarm for every 6 hours. I used the exact same code as above (with an AlarmManager and BraodcastReceiver), only instead of:

    cal.set(Calendar.YEAR, dpYear);
    cal.set(Calendar.MONTH, dpMonth);
    cal.set(Calendar.DAY_OF_MONTH, dpDay);
    cal.set(Calendar.HOUR_OF_DAY, tpHour);
    cal.set(Calendar.MINUTE, tpMinute);
    cal.set(Calendar.SECOND, 0);

All I had was:

    cal.set(Calendar.SECOND, 0);
    cal.set(Calendar.MINUTE, 0);
    cal.set(Calendar.HOUR_OF_DAY, 18);

And it works perfectly. So are the "YEAR", "MONTH", and "DAY_OF_MONTH" the ones that are causing problems here. If so, what's the solution?

I have looked a lot for solutions to my problem and I've found similar questions on stackoverflow, but none have helped me. Any help would be much appreciated.

Answer 1

After lots and lots of trying... I realized that the problem is that Calendar.DAY_OF_MONTH takes months starting from 0 to 11 (0 being Jan and 11 being December)... And I unfortunately did not know that, so I added 1 to the value of month obtained from the datePicker. So I just removed the + 1 and now it's working perfectly.