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Examples of Intent and Bundles

Allen Scott 2312 18-Jan-2016
I need a simple example code that will show me the difference between Intents and Bundles 
android android  android intent 
Updated on 27-Jun-2023
Allen Scott

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2 Answers

Aryan Kumar

Aryan Kumar

27-Jun-2023

Sure, here is an example of how to use an Intent and a Bundle to transfer data from one activity to another:

Code snippet

// Create an Intent to start the second activity.
Intent intent = new Intent(this, SecondActivity.class);

// Add some data to the Intent.
Bundle bundle = new Bundle();
bundle.putString("data", "This is the data");
intent.putExtras(bundle);

// Start the activity.
startActivity(intent);

In the second activity, you can retrieve the data that was passed in the Intent using the getExtras() method.

Code snippet

// Get the data from the Intent.
Bundle bundle = getIntent().getExtras();
String data = bundle.getString("data");

The data variable will now contain the string that was passed in the Intent.

Here is an example of how to use a Bundle to store a more complex data structure:

Code snippet

// Create a Bundle to store the data.
Bundle bundle = new Bundle();

// Add a person object to the Bundle.
Person person = new Person();
person.setName("John Doe");
person.setAge(30);
bundle.putSerializable("person", person);

// Start the activity.
Intent intent = new Intent(this, SecondActivity.class);
intent.putExtras(bundle);
startActivity(intent);

In the second activity, you can retrieve the person object from the Bundle using the getSerializable() method.

Code snippet

// Get the person object from the Bundle.
Bundle bundle = getIntent().getExtras();
Person person = (Person) bundle.getSerializable("person");

The person variable will now contain the person object that was passed in the Bundle.

Anonymous User

Anonymous User

18-Jan-2016
In MainActivity :
Intent intent = new Intent(this, OtherActivity.class);
intent.putExtra(OtherActivity.KEY_EXTRA, yourDataObject);
startActivity(intent);

In OtherActivity :
public static final String KEY_EXTRA = "com.example.yourapp.KEY_BOOK";
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  String yourDataObject = null;
  Bundle extras = getIntent().getExtras();
  if (extras != null) {
      yourDataObject = extras.getString(KEY_EXTRA);
  }
  if (yourDataObject != null) {
        // do stuff
  } else {
      throw new IllegalArgumentException("Activity cannot find  extras " + KEY_EXTRA);
  }
}
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