getBooleanExtra

getBooleanExtra is a method commonly found in Android development, specifically within the Intent class. It is used to retrieve a boolean value that was previously put into an Intent as an extra. Intents are fundamental objects in Android used for inter-component communication, such as starting activities or services. When you need to pass a true or false value from one component to another, you can use the putExtra method of the Intent to store it with a specific key.

To retrieve this boolean value, the receiving component can then call getBooleanExtra. This method requires two arguments: the key that was used when putting the extra, and a default value. The default value is returned if no extra with the specified key is found in the Intent, or if the extra associated with that key is not a boolean type. This prevents NullPointerExceptions and ensures that the application can proceed even if the expected data is missing. For instance, if an activity is started with an intent containing a boolean extra indicating whether a specific feature is enabled, getBooleanExtra can be used to retrieve this status. The method signature typically looks like: boolean getBooleanExtra(String name, boolean defaultValue).