call activity method from broadcast receiver

use this

Intent intent=new Intent();
intent.setClassName("com.package.my", "bcd.class");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(intent);

Thanks @Manishika. To elaborate, making the Broadcastreceiver dynamic, instead of defining it in the manifest, did the trick. So in my broadcast receiver class, i add the code :

MainActivity main = null;
void setMainActivityHandler(MainActivity main){
    this.main=main;
}

In the end of the onReceive function of the BroadcastReceiver class, I call the main activity's function :

main.verifyPhoneNumber("hi");

In the main activity, I dynamically define and register the broadcast receiver before sending the sms:

SmsReceiver BR_smsreceiver = null;
BR_smsreceiver = new SmsReceiver();
BR_smsreceiver.setMainActivityHandler(this);
IntentFilter fltr_smsreceived = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(BR_smsreceiver,fltr_smsreceived);  

Pass your Activity's context to BroadcastReceiver's contructor.

public class SmsReceiver extends BroadcastReceiver{

    MainActivity ma; //a reference to activity's context

    public SmsReceiver(MainActivity maContext){
        ma=maContext;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        ma.brCallback("your string"); //calling activity method
    }

}

and in your MainActivity

public class MainActivity extends AppCompatActivity {
    ...
    public void onStart(){
        ...        
    SmsReceiver smsReceiver = new SmsReceiver(this); //passing context
    LocalBroadcastManager.getInstance(this).registerReceiver(smsReceiver,null);
        ...
    }

    public void brCallback(String param){
        Log.d("BroadcastReceiver",param);
    }
}

hope it helps