Block Inbox SMS in Android With BroadcastReceiver

Broadcast Receivers

Broadcast Receivers simply respond to broadcast messages from other applications or from the system itself. These messages are sometime called events or intents

Creating the Broadcast Receiver:

A broadcast receiver is implemented as a subclass of BroadcastReceiver class and overriding the onReceive() method where each message is received as a Intent object parameter.

public class IncomingSms extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) 

     {

       Toast toast = Toast.makeText(context, "Broadcast Receiver", duration);

toast.show();

      }

}

Registering Broadcast Receiver:

An application listens for specific broadcast intents by registering a broadcast receiver inAndroidManifest.xml file. Consider we are going to register MyReceiver for system generated event ACTION_BOOT_COMPLETED which is fired by the system once the Android system has completed the boot process.

<receiver android:name="com.example.smsbroadcastreceiver.IncomingSms">   

            <intent-filter android:priority="1000">

                <action android:name="android.provider.Telephony.SMS_RECEIVED" />

            </intent-filter>

        </receiver>

Example:

IncomingSms.Java:

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.support.v4.app.NotificationCompat;

import android.telephony.SmsManager;

import android.telephony.SmsMessage;

import android.util.Log;

import android.widget.Toast;

public class IncomingSms extends BroadcastReceiver {

// Get the object of SmsManager

final SmsManager sms = SmsManager.getDefault();

public void onReceive(Context context, Intent intent) {

// Retrieves a map of extended data from the intent.

final Bundle bundle = intent.getExtras();

try {

if (bundle != null) {

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.i("SmsReceiver", "senderNum: " + senderNum+ "; message: " + message);

int duration = Toast.LENGTH_LONG;

Toast toast = Toast.makeText(context, "senderNum: "+ senderNum + ",\n message: " + message, duration);

toast.show();

notification(context, message, senderNum);

}

}

} catch (Exception e) {

Log.e("SmsReceiver", "Exception smsReceiver" + e);

}

}

public void notification(Context context, String Msg, String to) {

String message = Msg + "\n" + to;

Intent intent = new Intent(context, MainActivity.class);

PendingIntent pIntent = PendingIntent.getActivity(context, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);

NotificationCompat.Builder builder = new NotificationCompat.Builder(context)

.setSmallIcon(R.drawable.ic_launcher).setTicker(message)

.setContentTitle(context.getResources().getString(R.string.app_name))

.setContentText(message).setContentIntent(pIntent)

.setAutoCancel(true);

NotificationManager notificationmanager = (NotificationManager) context

.getSystemService(Context.NOTIFICATION_SERVICE);

notificationmanager.notify(0, builder.build());

}

}

MainActivity.java:

import android.app.Activity;

import android.os.Bundle;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

}

activity_main.Xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".BroadcastPhoneStates" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="When new SMS will come it will show a alert message." />

</RelativeLayout>

AndroidManifest.Xml:

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

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

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

  <receiver android:name="com.example.smsbroadcastreceiver.IncomingSms">   

            <intent-filter android:priority="1000">

                <action android:name="android.provider.Telephony.SMS_RECEIVED" />

            </intent-filter>

  </receiver>