Common mistakes when working with SharedPreferences?

SharedPreferences is a powerful tool for Android developers to store small amounts of data. However, many developers make common mistakes when using it. Here are some of those mistakes along with best practices to avoid them:

1. Not Using the Correct Context

Using the wrong context can lead to memory leaks or not being able to access the preferences. Always use the application context.

2. Forgetting to Commit or Apply Changes

Changes made to SharedPreferences need to be saved. Failing to call commit() or apply() can result in data loss.

3. Not Handling Data Types Correctly

Using the wrong method to retrieve data can cause runtime exceptions. Ensure you're using the correct method for the data type you stored.

4. Ignoring the Needs for Encryption

Since SharedPreferences stores data as plain text, sensitive information should be encrypted before saving.

5. Overusing SharedPreferences for Large Data

SharedPreferences is ideal for small amounts of data. For larger datasets, consider using a database.

Example Code

// Storing data in SharedPreferences SharedPreferences sharedPref = getApplicationContext().getSharedPreferences("MyPrefs", Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putString("key_name", "value_name"); // Use apply() for asynchronous saving editor.apply(); // Retrieving data String value = sharedPref.getString("key_name", "default_value"); Log.d("TAG", "Retrieved value: " + value);

Android SharedPreferences Common mistakes Android development SharedPreferences best practices

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