I am trying to make an application that shows a notification on the selected time and date entered by the user from date picker and time picker, but after selecting the time and date it is not showing on that exact time. Instead it fires after a few seconds when I press ok button. Code is given below for main activity:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_reminder);
Reminder_Title=(EditText)findViewById(R.id.Reminder_Title);
tDate=(TextView) findViewById(R.id.Date_text);
tTime=(TextView)findViewById(R.id.Time_text);
tRepeat=(TextView)findViewById(R.id.Repeat_text);
doneFab=(FloatingActionButton)findViewById(R.id.donefab);
calendar=Calendar.getInstance();
int Hour = calendar.get(Calendar.HOUR_OF_DAY);
int Mint = calendar.get(Calendar.MINUTE);
final int Year = calendar.get(Calendar.YEAR);
final int Month = calendar.get(Calendar.MONTH) + 1;
final int Day = calendar.get(Calendar.DAY_OF_MONTH);
mDate = Day + "/" + Month + "/" + Year;
tDate.setText(mDate);
if(Mint<10) {
mTime=Hour + ":"+0+ Mint;
}
else
{
mTime=Hour + ":" + Mint;
}
tTime.setText(mTime);
doneFab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Reminder_Title.getText().toString().length() != 0) {
AlertDialog.Builder Message = new AlertDialog.Builder(Add_Reminder.this);
Message.setTitle("Message");
Message.setMessage("Reminder Added!!");
Message.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onClick(DialogInterface dialog, int which) {
// Set calender for notifcation
calendar.set(Calendar.MONTH, --nMonth);
calendar.set(Calendar.YEAR, nYear);
calendar.set(Calendar.DAY_OF_MONTH, nDay);
calendar.set(Calendar.HOUR_OF_DAY, nHour);
calendar.set(Calendar.MINUTE, nMinute);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
long selectedTimestamp = calendar.getTimeInMillis();
Intent intent=new Intent(Add_Reminder.this,AlarmSetter.class);
PendingIntent p1=PendingIntent.getBroadcast(getApplicationContext(),0, intent,0);
AlarmManager a=(AlarmManager)getSystemService(ALARM_SERVICE);
a.setExactAndAllowWhileIdle(AlarmManager.RTC,selectedTimestamp,p1);
}
});
AlertDialog alert = Message.create();
alert.show();
}
}
});
}
public void setDate(View view) {
Calendar c=Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);
DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener()
{
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
{
//getting reminder set dates and day
nYear=year;
nMonth=monthOfYear;
nDay=dayOfMonth;
mDate=dayOfMonth + "-" + (monthOfYear + 1) + "-" + year;
tDate.setText(mDate);
}
}, mYear, mMonth, mDay);
datePickerDialog.show();
}
public void setTime(View view) {
Calendar c = Calendar.getInstance();
int mHour = c.get(Calendar.HOUR);
int mMinute = c.get(Calendar.MINUTE);
// Launch Time Picker Dialog
TimePickerDialog timePickerDialog = new TimePickerDialog(this,
new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int HOUR_OF_DAY,
int minute) {
nHour=HOUR_OF_DAY;
nMinute=minute;
if(minute<10) {
mTime=HOUR_OF_DAY + ":"+0+ minute;
}
else
{
mTime=HOUR_OF_DAY + ":" + minute;
}
tTime.setText(mTime);
}
}, mHour, mMinute, false);
timePickerDialog.show();
}
public void setRepeating(View view)
{
final String[] items = new String[6];
items[0] = "No Repeating";
items[1] = "Every Hour";
items[2] = "Every Day";
items[3] = "Every Week";
items[4] = "Every Month";
items[5] = "Every Year";
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select Type");
builder.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
String mRepeatType = items[item];
tRepeat.setText(mRepeatType);
}
});
AlertDialog alert = builder.create();
alert.show();
}
Code for Alarm.java
public class AlarmSetter extends BroadcastReceiver{
@Override public void onReceive(Context context, Intent intent) {
String id="main_channel";
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O) {
Toast.makeText(context, "Wake up", Toast.LENGTH_LONG).show();
NotificationManager notificationManager=(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
CharSequence name="Channel Name";
String description="Channel Description";
int importance=NotificationManager.IMPORTANCE_HIGH;
NotificationChannel notificationChannel=new NotificationChannel(id,name,importance);
notificationChannel.setDescription(description);
notificationChannel.enableLights(true);
notificationChannel.setLightColor(Color.WHITE);
notificationChannel.enableVibration(false);
if(notificationManager!=null)
{
notificationManager.createNotificationChannel(notificationChannel);
}
NotificationCompat.Builder notificationBuilder =new NotificationCompat.Builder(context,id);
notificationBuilder.setSmallIcon(R.drawable.timesmall);
notificationBuilder.setContentTitle("Notification Title");
notificationBuilder.setLights(Color.WHITE,500,5000);
notificationBuilder.setColor(Color.RED);
notificationBuilder.setDefaults(Notification.DEFAULT_SOUND);
NotificationManagerCompat notificationManagerCompat=NotificationManagerCompat.from(context);
notificationManagerCompat.notify(1000,notificationBuilder.build());
}
}
}
