Android Open Source - SmsRadar Sms Observer

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...

Java Source Code

/*
 * Copyright (c) Tuenti Technologies S.L. All rights reserved.
 */*from w w  w  .  j  ava 2s  .c o  m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.tuenti.smsradar;


import android.content.ContentResolver;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;


/**
 * ContentObserver created to handle the sms content provider changes. This entity will be called each time the
 * system changes the sms content provider state.
 * <p/>
 * SmsObserver analyzes the change and studies if the protocol used is null or not to identify if the sms is incoming
 * or outgoing.
 * <p/>
 * SmsObserver will analyze the sms inbox and sent content providers to get the sms information and will notify
 * SmsListener.
 * <p/>
 * The content observer will be called each time the sms content provider be updated. This means that all
 * the sms state changes will be notified. For example, when the sms state change from SENDING to SENT state.
 *
 * @author Pedro Vcente Gmez Snchez <pgomez@tuenti.com>
 * @author Manuel Peinado <mpeinado@tuenti.com>
 */
class SmsObserver extends ContentObserver {

  private static final Uri SMS_URI = Uri.parse("content://sms/");
  private static final Uri SMS_SENT_URI = Uri.parse("content://sms/sent");
  private static final Uri SMS_INBOX_URI = Uri.parse("content://sms/inbox");
  private static final String PROTOCOL_COLUM_NAME = "protocol";
  private static final String SMS_ORDER = "date DESC";

  private ContentResolver contentResolver;
  private SmsCursorParser smsCursorParser;

  SmsObserver(ContentResolver contentResolver, Handler handler, SmsCursorParser smsCursorParser) {
    super(handler);
    this.contentResolver = contentResolver;
    this.smsCursorParser = smsCursorParser;
  }

  @Override
  public boolean deliverSelfNotifications() {
    return true;
  }

  @Override
  public void onChange(boolean selfChange) {
    super.onChange(selfChange);
    Cursor cursor = null;
    try {
      cursor = getSmsContentObserverCursor();
      if (cursor != null && cursor.moveToFirst()) {
        processSms(cursor);
      }
    } finally {
      close(cursor);
    }
  }

  private void processSms(Cursor cursor) {
    Cursor smsCursor = null;
    try {
      String protocol = cursor.getString(cursor.getColumnIndex(PROTOCOL_COLUM_NAME));
      smsCursor = getSmsCursor(protocol);
      Sms sms = parseSms(smsCursor);
      notifySmsListener(sms);
    } finally {
      close(smsCursor);
    }
  }

  private void notifySmsListener(Sms sms) {
    if (sms != null && SmsRadar.smsListener != null) {
      if (SmsType.SENT == sms.getType()) {
        SmsRadar.smsListener.onSmsSent(sms);
      } else {
        SmsRadar.smsListener.onSmsReceived(sms);
      }
    }
  }

  private Cursor getSmsCursor(String protocol) {
    return getSmsDetailsCursor(protocol);
  }

  private Cursor getSmsDetailsCursor(String protocol) {
    Cursor smsCursor;
    if (isProtocolForOutgoingSms(protocol)) {
      //SMS Sent
      smsCursor = getSmsDetailsCursor(SmsContext.SMS_SENT.getUri());
    } else {
      //SMSReceived
      smsCursor = getSmsDetailsCursor(SmsContext.SMS_RECEIVED.getUri());
    }
    return smsCursor;
  }

  private Cursor getSmsContentObserverCursor() {
    String[] projection = null;
    String selection = null;
    String[] selectionArgs = null;
    String sortOrder = null;
    return contentResolver.query(SMS_URI, projection, selection, selectionArgs, sortOrder);
  }

  private boolean isProtocolForOutgoingSms(String protocol) {
    return protocol == null;
  }

  private Cursor getSmsDetailsCursor(Uri smsUri) {

    return smsUri != null ? this.contentResolver.query(smsUri, null, null, null, SMS_ORDER) : null;
  }

  private Sms parseSms(Cursor cursor) {
    return smsCursorParser.parse(cursor);
  }

  private void close(Cursor cursor) {
    if (cursor != null) {
      cursor.close();
    }
  }

  /**
   * Represents the SMS origin.
   */
  private enum SmsContext {
    SMS_SENT {
      @Override
      Uri getUri() {
        return SMS_SENT_URI;
      }
    }, SMS_RECEIVED {
      @Override
      Uri getUri() {
        return SMS_INBOX_URI;
      }
    };

    abstract Uri getUri();
  }
}

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