What methods can be used to extract information from Intent in Android applications?

In Android, methods are used to extract information from an Intent's "extras" — additional parameters passed along with the Intent. Main methods:

• getStringExtra(String name) — to get a string by key.
• getIntExtra(String name, int defaultValue) — to get an integer with a default value.
• getBooleanExtra(String name, boolean defaultValue) — to get a boolean value.
• getSerializableExtra(String name) — to get an object implementing Serializable.
• getParcelableExtra(String name) — to get an object implementing Parcelable.

Example:

Intent intent = getIntent();
String username = intent.getStringExtra("username");
int age = intent.getIntExtra("age", 0);
boolean isActive = intent.getBooleanExtra("isActive", false);

You can also get a Bundle using getExtras() and extract data from it.