This document discusses using intents to start activities and send data between activities in Android. It provides examples of creating explicit intents to start a new activity, sending extra data to another activity, and receiving extra data in the new activity. It also covers using implicit intents to launch other apps like making phone calls, opening browser links, and viewing maps. Tips are given for navigating back to the parent activity and code samples are provided for sending data to a second activity in a codelab.

1. Intent
Anuchit Chalothorn
anoochit@gmail.com

3. Intent to start activity
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
startActivity(intent);

4. Intent to send extra data
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
String textValue = String.valueOf(editText.getText());
intent.putExtra("TEXT_FORM",textValue);
startActivity(intent);

5. Receive extra data
Bundle bundle = getIntent().getExtras();
if (bundle!=null) {
String value = bundle.getString("TEXT_FORM");
txtView.setText(value);
}

6. Tips: Up button back to parent activity
<activity android:name=".SecondActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="net.redlinesoft.a05_intent.MainActivity" />
</activity>

7. Codelab: Explicit Intent
Use 2 buttons to navigate to second activity
● Sent data in edittext to second activity and show in
textview
● Just navigate to second activity and show default value
of textview

10. Codelab: send data to 2nd
activity
Send basic form data to second activity.

12. Codelab: Implicit Intent
Send intent to android system to find out which activity can
take action with extra data. some

13. Intent with data
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, "News for you!");
startActivity(intent);

14. Intent with data
String url = "http://www.example.com";
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);

15. Sample Implicit Intent
Open Browser
● Intent.ACTION_VIEW
● Uri.parse("http://google.com");

16. Sample Implicit Intent
Call Someone
● Intent.ACTION_CALL
● Uri.parse("tel:0891234567");

17. Dial
● Intent.ACTION_DIAL
● Uri.parse("tel:0891234567");
Sample Implicit Intent
* Don’t forget request permission to dial.

18. Sample Implicit Intent
Show Map
● Intent.ACTION_VIEW
● Uri.parse("geo:0,0?q=13.901720, 100.532805 (PIM)");

19. Sample Implicit Intent
Search on Map
● Intent.ACTION_VIEW
● Uri.parse("geo:0,0?q=Bluecup coffee");