schedule a repeating alarm

To schedule a repeating alarm, call setRepeating(int type, long triggerAtTime, long interval, PendingIntent operation) method of AlarmManager instead of set(int type, long triggerAtTime, PendingIntent operation).

Modify from last post "Cancel alarm with a matching PendingIntent". (Also change using TimePicker widget instead of TimePickerDialog)

package com.exercise.AndroidTime;

import java.util.Calendar;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.TimePicker;

public class AndroidTimeActivity extends Activity {
 
 TimePicker myTimePicker;
 Button buttonstartSetDialog;
 Button buttonCancelAlarm;
 TextView textAlarmPrompt;
 
 TimePicker timePicker;
 CheckBox optRepeat;
 
 final static int RQS_1 = 1;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        timePicker = (TimePicker)findViewById(R.id.picker);
        optRepeat = (CheckBox)findViewById(R.id.optrepeat);
        textAlarmPrompt = (TextView)findViewById(R.id.alarmprompt);
        
        buttonstartSetDialog = (Button)findViewById(R.id.startSetDialog);
        buttonstartSetDialog.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    Calendar calNow = Calendar.getInstance();
    Calendar calSet = (Calendar) calNow.clone();

    calSet.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
    calSet.set(Calendar.MINUTE, timePicker.getCurrentMinute());
    calSet.set(Calendar.SECOND, 0);
    calSet.set(Calendar.MILLISECOND, 0);
    
    if(calSet.compareTo(calNow) <= 0){
     //Today Set time passed, count to tomorrow
     calSet.add(Calendar.DATE, 1);
    }
    
    setAlarm(calSet, optRepeat.isChecked());
    
   }});

        buttonCancelAlarm = (Button)findViewById(R.id.cancel);
        buttonCancelAlarm.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    cancelAlarm();
   }});
        
    }

 private void setAlarm(Calendar targetCal, boolean repeat){
  
  Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
  AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
  alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);

  if(repeat){
   alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
     targetCal.getTimeInMillis(), 
     TimeUnit.MINUTES.toMillis(5),
     pendingIntent);
   
   textAlarmPrompt.setText(
     "\n\n***\n"
     + "Alarm is set@ " + targetCal.getTime() + "\n"
     + "Repeat every 5 minutes\n"
     + "***\n");
  }else{
   alarmManager.set(AlarmManager.RTC_WAKEUP, 
     targetCal.getTimeInMillis(),  
     pendingIntent);
   
   textAlarmPrompt.setText(
     "\n\n***\n"
     + "Alarm is set@ " + targetCal.getTime() + "\n"
     + "One shot\n"
     + "***\n");
  }

 }
 
 private void cancelAlarm(){

  textAlarmPrompt.setText(
    "\n\n***\n"
    + "Alarm Cancelled! \n"
    + "***\n");
  
  Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
  AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
  alarmManager.cancel(pendingIntent);

 }
  
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <TimePicker
        android:id="@+id/picker"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <CheckBox
        android:id="@+id/optrepeat"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Repeat every 5 minutes" />
    <Button
        android:id="@+id/startSetDialog"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="Set Target Time"/>
    <Button
        android:id="@+id/cancel"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="Cancel Alarm"/>
    <TextView
        android:id="@+id/alarmprompt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

Both AlarmReceiver.java and AndroidManifest.xml keep no change, refer to the exercise "Create alarm set on a specified time, using AlarmManager and BroadcastReceiver."


Download the files.


Next:
- Generate Notification using Notification.Builder for Android 3.0