The document describes how to create a new Android activity and send data between activities using intents. It involves creating a new activity called "Display Message Activity", adding an onclick listener to a button in the main activity to call a sendMessage method, defining an intent in that method to launch the new activity and passing data via extras, and receiving that data in the new activity. The intent acts as a bridge between activities, allowing transition between them and passing of optional data.

1. Create another Android activity
and start it by Intent
By
Mark, Chao-Yih Hsia

2. New>Other..
Select 'Android Activity'

3. Click Next

4. Set the name as 'Display Message
Activity'

5. Add 'android:onClick = ”sendMessage”'
for Button
to the file of activity_main.xml

6. Add a sendMessage method to the
mainActivity.java

7. Add import for View

8. Define import and
EXTRA_MESSAGE

9. Add an Intent into sendMessage
for switching into the DisplayMessageActivity

10. Run As Android Application, click
'Send' Button to Switch to Intent

11. Switch to Intent Activity

12. Intent: A bridge between Activities
/** Called when the user clicks the Send button */
public void sendMessage(View view) {
Intent intent = new Intent(this,
DisplayMessageActivity.class);
EditText editText = (EditText)
findViewById(R.id.editText1);
String message =
editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}