Question

Following is an onclick method called when a button is clicked. But the code doesn’t stop my application. It sends a message and then closes and then restarts again.. I have read the lifecycle model of an activity and fyi this is a single activity application. I also researched on stackoverflow, many of the post describing to have a return statement after finish() call so i have done that too but no results.

Where am i going wrong ???

public void onClick(View v) 
    {       
        String text = "Demo Message";

        String number = <set via a particular code>;


        if(number.equals(""))
        {
            Toast.makeText(this, "Please Enter or Select a Number", Toast.LENGTH_SHORT).show();
        }
        else
        {
            sms = SmsManager.getDefault();
            PendingIntent sentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, Main.class), 0);

            sms.sendTextMessage(number, null, text, sentIntent, null);
            Toast.makeText(this, "Message Sent to : " + number, Toast.LENGTH_SHORT).show();

            // Stop the Activity...
            finish();           
            return;
        }   
    }

Answer 1

Everything is quite simple. Your PendingIntent calls Main activity after sending sms. So the process is the following:

1. Your application sends sms
2. After that activity is finished
3. But PendingIntent runs this activity once again

You can simply test this by inputting in the onCreate() method log task, for instance Log.d("MyApp", "onCreate()"); and you’ll see that it is called after your sms is sent.