BETTER ANDROID INTENTS DART & HENSON https://github.com/f2prateek/dart 

ABOUT US Senior Android Dev @ Groupon ~20 years of Java coding OSS: Dart, TP STEPHANE NICOLAS DANIEL MOLINERO REGUERA Android Dev @ Groupon Best level 3 ever OSS: Dart, +stephane)nicolas @D_Lemures 

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 jobs.groupon.com/careers/ 

INTENTS & EXTRAS NAVIGATION LAYER DART: CONSUMING INTENTS ANNOTATIONS BINDING SETUP HENSON: CREATING INTENTS INTENT BUILDERS FLUENT API ANNOTATIONS SETUP CONCLUSION THE TALK 

EXTRAS CAN BE USED TO PROVIDE EXTENDED INFORMATION AN INTENT IS AN ABSTRACT DESCRIPTION OF AN OPERATION TO BE PERFORMED INTENTS & EXTRAS BROADCAST
 RECEIVER SERVICE ACTIVITY from developer.android.com/reference/android/content/Intent.html INTENT EXTRAS 

NAVIGATION LAYER ACTIVITY 1 ACTIVITY 4 ACTIVITY 2 ALL INTENTS TOGETHER FORM THE NAVIGATION LAYER OF AN ANDROID APP ACTIVITY 3 ACTIVITY 5 ACTIVITY 6 

NAVIGATION LAYER HOW TO ORGANIZE 
 YOUR NAVIGATION LAYER ? 

CONSUMING & CREATING INTENTS DEAL LIST 
 ACTIVITY DEAL DETAIL 
 ACTIVITY CREATING AN INTENT CONSUMING AN INTENT 

DART CONSUMING 
 INTENTS 

DART: CONSUMING INTENTS ACTIVITY String field1 int field2 boolean field3 INTENT EXTRA 1 value 1 EXTRA 2 value 2 EXTRA 3 value 3 EXTRAS 

DART: CONSUMING INTENTS public class DealDetailActivity extends Activity { public static final String EXTRA_DEAL_ID = "EXTRA_DEAL_ID"; public static final String EXTRA_SHOW_MAP = "EXTRA_SHOW_MAP"; 
 private String dealId; private boolean shouldShowMap; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); dealId = getIntent().getStringExtra(EXTRA_DEAL_ID); shouldShowMap = getIntent().getBooleanExtra(EXTRA_SHOW_MAP, false); if (dealId == null) { throw new IllegalArgumentException("Deal Id is required"); } ... } 

public class DealDetailActivity extends Activity { public static final String EXTRA_DEAL_ID = "EXTRA_DEAL_ID"; public static final String EXTRA_SHOW_MAP = "EXTRA_SHOW_MAP"; 
 private String dealId; private boolean shouldShowMap; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); dealId = getIntent().getStringExtra(EXTRA_DEAL_ID); shouldShowMap = getIntent().getBooleanExtra(EXTRA_SHOW_MAP, false); if (dealId == null) { throw new IllegalArgumentException("Deal Id is required"); } ... } DART: CONSUMING INTENTS BOILERPLATE!!! 

DART: ANNOTATIONS DECLARE REQUIRED AND OPTIONAL FIELDS public class DealDetailActivity extends Activity {
 @InjectExtra String dealId; @InjectExtra @Nullable Boolean shouldShowMap; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Dart.inject(this); ... } } 

DART: BINDING BIND INTENT EXTRAS TO ANNOTATED FIELDS public class DealDetailActivity extends Activity {
 @InjectExtra String dealId; @InjectExtra @Nullable Boolean shouldShowMap; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Dart.inject(this); ... } } 

ACTIVITY MODEL String field1 int field2 boolean field3 DART: BINDING A MODEL SEPARATE EXTRAS AND ACTIVITIES 

public class DealDetailModel {
 @InjectExtra String dealId; @InjectExtra @Nullable Boolean shouldShowMap; } MODEL: public class DealDetailActivity extends Activity {
 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Dart.inject(detailModelInstance, this); ... } ACTIVITY: DART: BINDING A MODEL 

compile ‘com.f2prateek.dart:dart:2.0.1 provided ‘com.f2prateek.dart:dart-processor:2.0.1 GRADLE: com.f2prateek.dart dart 2.0.1 com.f2prateek.dart dart-processor 2.0.1 provided MAVEN: DART: SETUP 

HENSON CREATING INTENTS 

public class CentralIntentFactory { public Intent newDealDetailActivityIntent(Context context, String dealId) {
 return new Intent(context, DealDetailActivity.class) .putExtra(EXTRA_DEAL_ID, dealId);
 }
 
 public Intent newDealDetailActivityIntent(Context context, 
 String dealId, 
 boolean showMap) {
 return new Intent(context, DealDetailActivity.class)
 .putExtra(EXTRA_DEAL_ID, dealId)
 .putExtra(EXTRA_SHOW_MAP, showMap);
 }
 ...
 } 
 HENSON: CREATING INTENTS - MEYER’S OPEN/CLOSED PRINCIPLE - BIG BALL OF MUD 

public class DealDetailActivity extends Activity { ... public static Intent getIntent(Context context, 
 String dealId) { 
 return new Intent(context, DealDetailActivity.class)
 .putExtra(EXTRA_DEAL_ID, dealId);
 } 
 
 public static Intent getIntent(Context context, 
 String dealId, 
 boolean showMap) { 
 return new Intent(context, DealDetailActivity.class)
 .putExtra(EXTRA_DEAL_ID, itemId)
 .putExtra(EXTRA_SHOW_MAP, showMap);
 } ...
 } 
 HENSON: CREATING INTENTS BOILERPLATE!!! 

DART & HENSON GENERATE THEM FOR YOU ! 
 HENSON: INTENT BUILDERS public class DealDetailActivity extends Activity {
 @InjectExtra String dealId; @InjectExtra @Nullable Boolean shouldShowMap; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Dart.inject(this); ... } } 

public class DealDetailActivity$$IntentBuilder {
 private Intent intent;
 private Bundler bundler = Bundler.create();
 
 public DealDetailActivity$$IntentBuilder(Context context) {
 intent = new Intent(context, DealDetailActivity.class);
 }
 
 public DealDetailActivity$$IntentBuilder dealId(String dealId) {
 bundler.put("dealId", dealId);
 return this;
 }
 
 public DealDetailActivity$$IntentBuilder shouldShowMap(Boolean shouldShowMap) {
 bundler.put(“shouldShowMap", shouldShowMap);
 return this;
 }
 
 public Intent build() {
 intent.putExtras(bundler.get());
 return intent;
 } } 
 HENSON: INTENT BUILDERS 

public class DealDetailActivity$$IntentBuilder {
 private Intent intent;
 private Bundler bundler = Bundler.create();
 
 public DealDetailActivity$$IntentBuilder(Context context) {
 intent = new Intent(context, DealDetailActivity.class);
 }
 
 public DealDetailActivity$$IntentBuilder dealId(String dealId) {
 bundler.put("dealId", dealId);
 return this;
 }
 
 public DealDetailActivity$$IntentBuilder shouldShowMap(Boolean shouldShowMap) {
 bundler.put(“shouldShowMap", shouldShowMap);
 return this;
 }
 
 public Intent build() {
 intent.putExtras(bundler.get());
 return intent;
 } } 
 HENSON: INTENT BUILDERS 

public class DealDetailActivity$$IntentBuilder {
 private Intent intent;
 private Bundler bundler = Bundler.create();
 
 public DealDetailActivity$$IntentBuilder(Context context) {
 intent = new Intent(context, DealDetailActivity.class);
 }
 
 public DealDetailActivity$$IntentBuilder dealId(String dealId) {
 bundler.put("dealId", dealId);
 return this;
 }
 
 public DealDetailActivity$$IntentBuilder shouldShowMap(Boolean shouldShowMap) {
 bundler.put(“shouldShowMap", shouldShowMap);
 return this;
 }
 
 public Intent build() {
 intent.putExtras(bundler.get());
 return intent;
 } } 
 HENSON: INTENT BUILDERS 


 HENSON: FLUENT API Intent intent = Henson.with(context) .gotoDealDetailActivity() .dealId(dealId) .shouldShowMap(true) .build(); HENSON CLASS PROVIDES A FLUENT API TO ACCESS INTENT BUILDERS 

HENSON: ANNOTATIONS MAKE YOUR ACTIVITIES VISIBLE TO HENSON EVEN IF THEY DON'T USE DART ANNOTATIONS @HensonNavigable public class SettingsActivity extends Activity {
 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ... } } 

ACTIVITY MODEL String field1 int field2 boolean field3 HENSON: BINDING A MODEL SEPARATE EXTRAS AND ACTIVITIES 

public class DealDetailModel {
 @InjectExtra String dealId; @InjectExtra @Nullable Boolean shouldShowMap; } MODEL: @HensonNavigable(model = DealDetailModel.class) public class DealDetailActivity extends Activity {
 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Dart.inject(detailModelInstance, this); ... } ACTIVITY: HENSON: ANNOTATIONS 

compile ‘com.f2prateek.dart:henson:2.0.1 provided ‘com.f2prateek.dart:henson-processor:2.0.1 GRADLE: com.f2prateek.dart henson 2.0.1 com.f2prateek.dart henson-processor 2.0.1 provided MAVEN: HENSON: SETUP 

CONCLUSION, QUESTIONS ? 

BETTER ANDROID INTENTS DART & HENSON https://github.com/f2prateek/dart +stephane)nicolas @D_Lemures