SmsReceiver for Android

SmsReceiver.java

public class SmsReceiver extends BroadcastReceiver {

  public static final String SMS_RECEIVED_ACTION = "android.provider.Telephony.SMS_RECEIVED";
  private static final String KEY_PDUS = "pdus";

  @Override public void onReceive(final Context context, final Intent intent) {
    if (getActionFromIntent(intent).equals(SMS_RECEIVED_ACTION)) {

      final Intent smsServiceIntent = new Intent(context, SmsService.class);
      smsServiceIntent.putExtra(SmsService.KEY_SMS, getSmsFromIntent(intent));

      context.startService(smsServiceIntent);
    }
  }

  @NonNull private String getActionFromIntent(final Intent intent) {
    return intent != null && intent.getAction() != null ? intent.getAction() : "";
  }

  @NonNull private String getSmsFromIntent(final Intent intent) {
    final SmsMessage[] smsMessages = getMessagesFromIntent(intent);

    return smsMessages.length > 0 ? smsMessages[0].getMessageBody() : "";
  }

  @NonNull private SmsMessage[] getMessagesFromIntent(final Intent intent) {
    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT ? getMessagesFromIntentApi19(intent)
                                                               : getMessagesFromIntentApi15(intent);
  }

  @TargetApi(Build.VERSION_CODES.KITKAT) @NonNull
  private SmsMessage[] getMessagesFromIntentApi19(final Intent intent) {
    return Telephony.Sms.Intents.getMessagesFromIntent(intent);
  }

  @SuppressWarnings("deprecation") @NonNull
  public SmsMessage[] getMessagesFromIntentApi15(final Intent intent) {
    final Object[] pdus = (Object[]) intent.getSerializableExtra(KEY_PDUS);
    final SmsMessage[] smsMessages = new SmsMessage[pdus.length];

    for (int i = 0; i < pdus.length; i++) {
      smsMessages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
    }

    return smsMessages;
  }
}