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The Saved Instance State is not designed for performing read and write operations on the disk. Instead, it is designed to save and restore the state of an activity or fragment in case it is destroyed and recreated by the system, such as during a configuration change (e.g. orientation change).
To perform read and write operations on the disk in Android, you can use various methods such as:
- Using the Java IO classes such as FileInputStream, FileOutputStream, BufferedReader, BufferedWriter, etc.
- Using the Android-specific classes such as Context.getFileStreamPath(), Context.openFileInput(), Context.openFileOutput(), etc.
- Using third-party libraries such as Retrofit, OkHttp, Gson, etc.
It is recommended to perform disk operations asynchronously, for example by using AsyncTask, RxJava, or Kotlin Coroutines, to avoid blocking the main UI thread and improve app performance.