Dagger 2 ppt
- 1. Dagger 2
- 2. Dagger 2 Dagger 2 analyzes dependencies for you and generates code to help wire them together.
- 3. WITHOUT DAGGER 2 Activities Fragments Views Objects API interface (Retrofit) Image Loader (Picasso) Shared Preference Network client Image disk cache
- 4. DAGGER USAGE Components Object Find object @Inject Take all fields with annotation, look in the component and find the object by type, and set the field.
- 5. DAGGER USAGE @Inject Picasso Picasso; @ Inject Preference preference onject // in oncreate function getComponent().inject(this) Take all fields with annotation, look in the component and find the object by type, and set the field.
- 6. ANNOTATIONS USED BY DAGGER 2 • @Module and @Provides • @Inject • @Components
- 7. MODULES & COMPONENTS Activities Fragments Views Objects Network client Shared Preferences Application Network module Storage module Application module Application component .inject()
- 8. SCOPES • @UserScope • @Singleton • @ActivityScope
- 9. CONSTRUCTOR INJECTION @Provides public StoreUserInfo provideStorUserInfo(NetworkApi networkApi){ return new StoreUserInfo(networkApi); } public class MainActivity extends AppCompatActivity { @Inject StoreUserInfo storeUserInfo; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ((MyApplication) getApplication()).getComponent() .inject(this); }