Send sms in background in Android | Send sms after every 5 min in Android | Alarm Manager demo | Hash-map Demo in Android | Broadcast Receiver Demo in Android

Hi Guys,
Today I am sharing code for sending SMS in android programmatically, in background after every 5 min. For this I am using Alarm Manager. And you can set any number of contact and message, I am using Hash-map for that. Important steps are given below-

1) Create Hash Map for store phone number and messages.
     static HashMap<String, String> recorArray = null;

2) Create a receiver i.e. name-AlarmReceiver for sending SMS after every 5 min.

public class AlarmReceiver extends BroadcastReceiver {
private final String SOMEACTION = "com.manish.alarm.ACTION";

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

String action = intent.getAction();
if (SOMEACTION.equals(action)) {
/**
* call method to send sms
*/
MainActivity.sendSms();

}
}

}

3) Create a AlarmManager which will send SMS after every 5 min.

Intent intent = new Intent(context, AlarmReceiver.class);
intent.setAction("com.manish.alarm.ACTION");
PendingIntent pendingIntent = PendingIntent
.getBroadcast(MainActivity.this, 0, intent,
PendingIntent.FLAG_CANCEL_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
AlarmManager alarm = (AlarmManager) MainActivity.this
.getSystemService(Context.ALARM_SERVICE);
alarm.cancel(pendingIntent);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
500000, pendingIntent);

4) Add  <uses-permission android:name="android.permission.SEND_SMS" /> in manifest.xml.

5) Add receiver in manifest-
  <receiver android:name="com.manish.sendsmsinbackground.AlarmReceiver" >
            <intent-filter>
                <action android:name="com.manish.alarm.ACTION" />
            </intent-filter>
        </receiver>

My Code

1)MainActivity.java-

package com.manish.sendsmsinbackground;

import java.util.Calendar;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

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.telephony.SmsManager;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

/**

 *

 * @author manish

 *

 */

public class MainActivity extends Activity {

       EditText editTextPhone, editTextMessage;

       Button btnSubmit, btnStart;

       String phoneNumber, message;

       static HashMap<String, String> recorArray = null;

       Context context = MainActivity.this;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              /**

               * get id's fro xml

               */

              editTextPhone = (EditText) findViewById(R.id.editText1);

              editTextMessage = (EditText) findViewById(R.id.editText2);

              btnSubmit = (Button) findViewById(R.id.button1);

              btnStart = (Button) findViewById(R.id.button2);

              /**

               * create object of hashmap

               */

              recorArray = new HashMap<String, String>();

              /**

               * button's onclick listner object

               */

              btnSubmit.setOnClickListener(new OnClickListener() {

                     @Override

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                           phoneNumber = editTextPhone.getText().toString();

                           message = editTextMessage.getText().toString();

                           recorArray.put(phoneNumber, message);

                     }

              });

              btnStart.setOnClickListener(new OnClickListener() {

                     @Override

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                           System.out.println(recorArray);

                           fireAlarm();

                     }

              });

       }

       /**

        * send sms method

        */

       public static void sendSms() {

              Set<?> set = recorArray.entrySet();

              // Get an iterator

              Iterator<?> i = set.iterator();

              // Display elements

              while (i.hasNext()) {

                     @SuppressWarnings("rawtypes")

                     Map.Entry me = (Map.Entry) i.next();

                     System.out.print(me.getKey() + ": ");

                     System.out.println(me.getValue());

                     try {

                           SmsManager smsManager = SmsManager.getDefault();

                           smsManager.sendTextMessage(me.getKey().toString(), null, me

                                         .getValue().toString(), null, null);

                           System.out.println("message sent");

                     } catch (Exception e) {

                           System.out.println("sending failed!");

                           e.printStackTrace();

                     }

              }

       }

       public void fireAlarm() {

              /**

               * call broadcost reciver for send sms

               */

              Intent intent = new Intent(context, AlarmReceiver.class);

              intent.setAction("com.manish.alarm.ACTION");

              PendingIntent pendingIntent = PendingIntent

                           .getBroadcast(MainActivity.this, 0, intent,

                                         PendingIntent.FLAG_CANCEL_CURRENT);

              Calendar calendar = Calendar.getInstance();

              calendar.setTimeInMillis(System.currentTimeMillis());

              AlarmManager alarm = (AlarmManager) MainActivity.this

                           .getSystemService(Context.ALARM_SERVICE);

              alarm.cancel(pendingIntent);

              alarm.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),

                           500000, pendingIntent);

       }

}

2)AlarmReciver.java

package com.manish.sendsmsinbackground;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

public class AlarmReceiver extends BroadcastReceiver {

       private final String SOMEACTION = "com.manish.alarm.ACTION";

       @Override

       public void onReceive(Context context, Intent intent) {

              String action = intent.getAction();

              if (SOMEACTION.equals(action)) {

                     /**

                      * call method to send sms

                      */

                     MainActivity.sendSms();

              }

       }

}

3)activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

    <EditText

        android:id="@+id/editText1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_margin="10dp"

        android:hint="phone number"

        android:ems="10"

        android:inputType="phone"/>

    <EditText

        android:id="@+id/editText2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_margin="10dp"

        android:layout_below="@+id/editText1"

        android:layout_centerHorizontal="true"

        android:inputType="textMultiLine"/>

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText2"

        android:layout_below="@+id/editText2"

        android:text="Submit" />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentRight="true"

        android:layout_below="@+id/button1"

        android:layout_marginTop="73dp"

        android:text="Start Timer" />

</RelativeLayout>

4)manifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.manish.sendsmsinbackground"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="16" />

    <uses-permission android:name="android.permission.SEND_SMS" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.manish.sendsmsinbackground.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="com.manish.sendsmsinbackground.AlarmReceiver" >

            <intent-filter>

                <action android:name="com.manish.alarm.ACTION" />

            </intent-filter>

        </receiver>

    </application>

</manifest>

Download zip

Thanks!