How to track messages in Android?

This is easy to do with the broadcast receive entry in the manifest:

edit: it seems only for SMS_RECEIVED see this thread

<receiver android:name=".SMSReceiver"  android:enabled="true">
 <intent-filter android:priority="1000">
      <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
      <action android:name="android.provider.Telephony.SMS_SENT"/>
 </intent-filter>
</receiver>

And resolution:

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

Then create an llike receiver:

public class SMSReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
       if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")){
    //do something with the received sms        
       }else  if(intent.getAction().equals("android.provider.Telephony.SMS_SENT")){
            //do something with the sended sms
     }
  }
}

To process incoming sms, it might look like this:

Bundle extras = intent.getExtras();
Object[] pdus = (Object[]) extras.get("pdus");
for (Object pdu : pdus) {
        SmsMessage msg = SmsMessage.createFromPdu((byte[]) pdu);
        String origin = msg.getOriginatingAddress();
        String body = msg.getMessageBody();
....
}

If you want sms not to be pressed in commen InBox, you can achieve this with

abortBroadcast();