Send SMS in Alarm Service at a pre-defined time

In former exercises, it have been shown how to "Send SMS using android.telephony.SmsManager" and "A simple example of Alarm Service, using AlarmManager".

It's a exercise merge them together, start a alarm service in a pre-defined time (10 second), and send SMS using SmsManager inside service when time reached.



In the main activity, data can be passed as bundle as normal.
But there are no getIntent().getExtras() in Service class! It can be retrieved in onStart() call-back method, it will be passed as parameter.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<TextView
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Enter Phone Number:"
   />
<EditText
   android:id="@+id/smsnumber"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:inputType="phone"
   />
<TextView
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Enter Phone SMS Text:"
   />
<EditText
   android:id="@+id/smstext"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<Button
   android:id="@+id/startalarm"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Start"
   />
<Button
   android:id="@+id/cancelalarm"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Cancel"
   />
</LinearLayout>

main activity AndroidAlarmSMS.java

package com.exercise.AndroidAlarmSMS;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AndroidAlarmSMS extends Activity {

 String smsNumber, smsText;
 private PendingIntent pendingIntent;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       final EditText edittextSmsNumber = (EditText)findViewById(R.id.smsnumber);
       final EditText edittextSmsText = (EditText)findViewById(R.id.smstext);
      
       Button buttonStart = (Button)findViewById(R.id.startalarm);
       Button buttonCancel = (Button)findViewById(R.id.cancelalarm);
      
       buttonStart.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    smsNumber = edittextSmsNumber.getText().toString();
    smsText = edittextSmsText.getText().toString();
    
    Intent myIntent = new Intent(AndroidAlarmSMS.this, MyAlarmService.class);
    
    Bundle bundle = new Bundle();
             bundle.putCharSequence("extraSmsNumber", smsNumber);
             bundle.putCharSequence("extraSmsText", smsText);
             myIntent.putExtras(bundle);
    
    pendingIntent = PendingIntent.getService(AndroidAlarmSMS.this, 0, myIntent, 0);
    
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

             Calendar calendar = Calendar.getInstance();
             calendar.setTimeInMillis(System.currentTimeMillis());
             calendar.add(Calendar.SECOND, 10);
             alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
         
             Toast.makeText(AndroidAlarmSMS.this,
               "Start Alarm with \n" +
               "smsNumber = " + smsNumber + "\n" +
               "smsText = " + smsText,
               Toast.LENGTH_LONG).show();
    
   }});
      
       buttonCancel.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    alarmManager.cancel(pendingIntent);
    Toast.makeText(AndroidAlarmSMS.this, "Cancel!", Toast.LENGTH_LONG).show();
    
   }});
   }
  
}

the service, MyAlarmService.java

package com.exercise.AndroidAlarmSMS;

import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.telephony.SmsManager;
import android.widget.Toast;

public class MyAlarmService extends Service {
 
 String smsNumberToSend, smsTextToSend;

 @Override
 public void onCreate() {
  // TODO Auto-generated method stub
  
  Toast.makeText(this, "MyAlarmService.onCreate()", Toast.LENGTH_LONG).show();
 }

 @Override
 public IBinder onBind(Intent arg0) {
  // TODO Auto-generated method stub
  Toast.makeText(this, "MyAlarmService.onBind()", Toast.LENGTH_LONG).show();
  return null;
 }
 
 @Override
 public void onDestroy() {
  // TODO Auto-generated method stub
   super.onDestroy();
   Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show();
 }

 @Override
 public void onStart(Intent intent, int startId) {
  // TODO Auto-generated method stub
  super.onStart(intent, startId);
  
  Bundle bundle = intent.getExtras();
       smsNumberToSend = (String) bundle.getCharSequence("extraSmsNumber");
       smsTextToSend = (String) bundle.getCharSequence("extraSmsText");
  
  Toast.makeText(this, "MyAlarmService.onStart()", Toast.LENGTH_LONG).show();
  Toast.makeText(this,
         "MyAlarmService.onStart() with \n" +
         "smsNumberToSend = " + smsNumberToSend + "\n" +
         "smsTextToSend = " + smsTextToSend,
         Toast.LENGTH_LONG).show();
  
  SmsManager smsManager = SmsManager.getDefault();
  smsManager.sendTextMessage(smsNumberToSend, null, smsTextToSend, null, null);
 }

 @Override
 public boolean onUnbind(Intent intent) {
  // TODO Auto-generated method stub
  Toast.makeText(this, "MyAlarmService.onUnbind()", Toast.LENGTH_LONG).show();
  return super.onUnbind(intent);
 }

}

Modify AndroidManifest.xml to add <service android:name=".MyAlarmService" />

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.exercise.AndroidAlarmSMS"
     android:versionCode="1"
     android:versionName="1.0">
   <uses-sdk android:minSdkVersion="4" />

   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".AndroidAlarmSMS"
                 android:label="@string/app_name">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>
       <service android:name=".MyAlarmService" />
   </application>
   <uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
</manifest>

Download the files.