Android Broadcast Receiver не срабатывает

Я пытаюсь прочитать все входящие SMS в своем приложении для Android. Я написал широковещательный приемник для чтения сообщений и добавил разрешения для него в AndroidManifest. Я получаю следующую ошибку:

android.content.ActivityNotFoundException: не удалось найти явный класс активности {com.example.asus.otpclippr/com.example.asus.otpclippr.readerService}; вы объявили это действие в своем AndroidManifest.xml?

Это AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.asus.otpclippr">
<uses-permission-sdk-23 android:name="android.permission.BROADCAST_SMS"/>
<uses-permission-sdk-23 android:name="android.permission.RECEIVE_SMS" />
<uses-permission-sdk-23 android:name="android.permission.SEND_SMS" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name="com.example.asus.otpclippr.readerService" >
        <intent-filter>
            <action android:name="android.provider.Telephony.SMS_RECEIVED"      />
        </intent-filter>
    </receiver>
</application>

This is the MainActivity.java package com.example.asus.otpclippr;

import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;

public class MainActivity extends AppCompatActivity {
    CheckBox copyClip, createNotif ;
    Button btn ;
    private BroadcastReceiver br ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    copyClip = (CheckBox)findViewById(R.id.checkBox) ;
    createNotif = (CheckBox)findViewById(R.id.checkBox2) ;
    btn = (Button)findViewById(R.id.button) ;
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            boolean res = false ;
            res = isMyServiceRunning(readerService.class) ;
            Intent intent = new     Intent(MainActivity.this,readerService.class) ;
            //intent.setAction("android.provider.Telephony.SMS_RECEIVED") ;
            intent.putExtra("flag1",copyClip.isChecked());
            intent.putExtra("flag2",createNotif.isChecked()) ;
            Log.d("Checkpoint1","calling broadcast") ;
            startActivity(intent);
        }
    });

}

/*public boolean isMyServiceRunning(Class<?> serviceClass){
    ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE) ;
    for(ActivityManager.RunningServiceInfo service : activityManager.getRunningServices(Integer.MAX_VALUE)){
        if(serviceClass.getName().equals(service.service.getClassName())){
            return true ;
        }
    }
    return false ;
    }*/
}

А это пакет BroadcastReceiver com.example.asus.otpclippr;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.provider.Telephony;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;

/**
 * Created by ASUS on 27-12-2016.
 */

public class readerService extends BroadcastReceiver {
    SmsManager smsManager = SmsManager.getDefault() ;
    String[] msg ;
    @Override
    public void onReceive(Context context, Intent intent) {



    final Bundle bundle = intent.getExtras() ;
    try{
        if(bundle!=null) {
            SmsMessage smsMessage;

            if (Build.VERSION.SDK_INT >= 19) { //KITKAT
                SmsMessage[] msgs = Telephony.Sms.Intents.getMessagesFromIntent(intent);
                smsMessage = msgs[0];
            } else {
                Object pdus[] = (Object[]) bundle.get("pdus");
                smsMessage = SmsMessage.createFromPdu((byte[]) pdus[0]);
            }
            String message = smsMessage.getMessageBody() ;
            String[] checks = new String[]{"OTP","Transaction","Password","key","card","txn"} ;
            msg = message.split(" ") ;
            Log.d("Message",message) ;
            for(int i=0;i<checks.length;i++){
                if(message.contains(checks[i])){
                    checkforOTP(context,message) ;
                    Log.d("Check2","Checking for OTP") ;
                    break;
                }
            }

            /*final Object[] pdusObj = (Object[]) bundle.get("pdus");
            for (int i = 0; i < pdusObj.length; i++) {

                SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                String phoneNumber = currentMessage.getDisplayOriginatingAddress();

                String senderNum = phoneNumber;
                String message = currentMessage.getDisplayMessageBody();

                Log.d("SmsReceiver", "senderNum: " + senderNum + "; message: " + message);
                String[] msg = message.split(" ") ;
                Toast.makeText(context,message,Toast.LENGTH_SHORT).show();
                String[] checks = new String[]   {"OTP","Transaction","Password","key","card"} ;
                for(int j=0; j< checks.length; j++){
                    if(message.contains(checks[j])){
                        checkforOTP(message) ;
                        break;
                    }
                }
            }*/
        }
    }catch (Exception e){
        e.printStackTrace();
    }
}

public void checkforOTP(Context context ,String message){
    int pos = message.indexOf("is") ;
    String msg1 = message.substring(pos,message.length()) ;
    String otp1 = msg1.split(" ")[0];
    String msg2 = message.substring(0,pos) ;
    String[] tempA = msg2.split(" ") ;
    String otp2 = tempA[tempA.length -1] ;
    if(isValid(otp1)){
        Toast.makeText(context,"OTP is"+otp1,Toast.LENGTH_SHORT).show();
    }
    else if(isValid(otp2)){
        Toast.makeText(context,"OTP is "+otp2,Toast.LENGTH_SHORT).show();
    }
    else{
        Log.d("check3","Wrong call") ;
    }

}

public boolean isValid(String x){
    if(!(x.length()==4 || x.length() ==6)){
        return false ;
    }
    if(x.matches("\\d+")){
        return  true ;
    }
    return  false ;
}
}

Как правильно вызвать Broadcast Receiver из MainActivity? Заранее спасибо