title: Can I access the internal data of an application that has already been deployed and get data?
body: <p>I think the question itself is actually a fairly sensitive topic. I'll explain why I'm asking this question, assuming all the circumstances I'm going to tell you.</p>
  <h3>[fictional story]</h3>
  <p>I built a <code>Notepad</code> app using an internal database (SQLiteDatabase or Room) and deployed it to the Google Play Store. A lot of users are getting downloads, but there is a problem. We realized that an error occurred during the feedback we received from users, and this was an error we could not find during the development process. I've been getting these error reports from a lot of users, and I've been trying to solve the problem with <code>Notepad</code> version 2. However, version 2 did not solve the error for users whose data was already stored in the internal database in the wrong format. So I try to access their data by only accessing the internal database of my app of users. And we try to modify the data so that there are no errors and store it inside each user's phone.</p>
  <p>This is the story of the hypothetical situation that I assumed so far. Let me ask you a question.</p>
  <ol>
  <li>Can I access and modify the internal database of my app?</li>
  <li>If it is an action that should not be done, the reason is too natural and you do not need to explain it. So, how do apps with these problems solve them? If you simply delete the app and then install it again, users will not like it because the existing information will be lost.</li>
  <li>However, if you can access the internal database, how do you access it?</li>
  </ol>
  <p>If the answer in question 1 is no, you do not need to answer in question 3. Since it is a question that involves the user's personal information, I ask this question before the initial development of the app.</p>