SQL Database Design For Developers at php[tek] 2024
Intents are Awesome
1. Israel Ferrer
Android Lover since 2008
cofounder bubiloop
cofounder android.es
Barcelona GTUG Leader
Android Dev at Fever
Head Mobile Dept. at ASMWS
Computer Science at LaSalle
4. intent |inˈtent| noun
intention or purpose:
with alarm she realized his
intent | a real intent to cut back
on social programs.
flickr: chinesetealover
9. EXPLICIT INTENTS
• Explicit
Intent names the component which should be called
by the Android system, using the Java class as identifier.
• Used to open new activities in the same app.
final Intent intent=new Intent(this, LoginActivity.class);
startActivity(intent);
10. IMPLICIT INTENTS
• Implicitintent specifies the action to perform and optionally an
URI for the action.
• Implicit
Intent is managed by Android Intent resolution, which
maps the intent to a Service, Activity or Broadcasts Receiver
• Thisresolution is done by matching intent with intentFilters of
every app.
• Ifmore than one app can handle the action, the user will have
to choose.
final Intent intent=new Intent(Intent.ACTION_VIEW, "http://mylookout.com");
11. SHARE DATA
• Intents can contain aditional data by using putExtra() method
• intent.putExtra(EXTRA_CONVERSATION, conversation);
• the
receiving component can obtain this data by getExtras()
method
Bundle extras = getIntent().getExtras();
String conversation = extras.getString(EXTRA_CONVERSATION);
if (conversation != null) {
// Do something with the data
}
12. INTENT FILTERS
• AnIntentFilter specifies the types of Intent that an activity,
service, or broadcast receiver can respond to. IntentFilters are
declared in the Android Manifest.
• There are 3 pieces of information used for this resolution:
• Action
• Type: mymeType or scheme.
• Category: need to support DEFAULT to be found by
startActivity.
14. TO SUM UP
• Explicit: choose the component to call.
• Implicit: isa general intent with action and optionally URI.
The Intent resolution call the component that can handle it.
• Intents can share data between components and apps.
16. • Reuse code and functionality from 3rd party apps
• ACTION_SEND
• ACTION_VIEW
• geo:lat,lon to open map
• http://host to open browser
• tel:number to open dialer
17. • Define a set of intents to handle web addresses.
• Example: Twitter
• Define IntentFilter to handle twitter urls
<activity android:name=".UrlHandleActivity" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:host="www.twitter.com" android:scheme="http" />
</intent-filter>
</activity>
18. • Check the URL path to fire target Activity
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Uri uri = getIntent().getData();
if (null == uri) {
// Shouldn't happen. Handle errors.
finish();
return;
}
String path = uri.getPath();
for (Pair<String, Class> pair : DISPATCH_MAP) {
if (path.matches(pair.mFirst)) {
Intent intent = new Intent(this, pair.mSecond);
intent.setData(uri);
startActivity(intent);
finish();
return;
}
}
finish();
}
private static final List<Pair<String, Class>> DISPATCH_MAP
= new LinkedList<Pair<String, Class>>();
static {
DISPATCH_MAP.add(new Pair<String, Class>("(.*)/status$",
TweetActivity.class));
DISPATCH_MAP.add(new Pair<String, Class>("/another/path",
ProfileActivity.class));
}
19. • Exposeintents to 3rd party apps. Example: Lookout public
backup intent.
21. A core component of Android.
A way to reuse functionality between apps.
The glue between activities.
The mashup concept into a mobile platform
Intents are Awesome for users & developers
