How would you implement a data transfer mechanism in a system?

There are several ways to transfer data in an Android application depending on the context:

• Intent — for transferring data between Activities or Services. For example:

Intent intent = new Intent(CurrentActivity.this, NextActivity.class);
intent.putExtra("key", "value");
startActivity(intent);

• Bundle — for passing complex data within an Intent or saving state.

• SharedPreferences — for storing small amounts of data between sessions.

• ViewModel and LiveData — for passing and storing data between fragments within the same Activity.

• Object serialization — using Parcelable or Serializable for transferring complex objects.

The choice depends on the volume and lifecycle of the data.