LifeCycleBinder


Source link: https://github.com/fabioCollini/LifeCycleBinder

LifeCycleBinder

Using LifeCycleBinder you can create Java classes connected to the lifecycle of an Activity or a Fragment.

The usage is simple, you just need to create a class that implements LifeCycleAware and modify your Activity/Fragment adding a field annotated with @BindLifeCycle and invoking LifeCycleBinder.bind(this) in onCreate method.

If you want to create an object that survives on configuration changes you can annotate a Callable or a Provider field using @RetainedObjectProvider annotation.

Usage

In this example we are using a field annotated with @BindLifeCycle. We don't need to extend a custom base class, we just invoke the LifeCycleBinder.bind static method:

public class MyActivity extends AppCompatActivity {

  @BindLifeCycle
  MyLifeCycleAware myLifeCycleAware = new MyLifeCycleAware();

private TextView textView;

@Override
  public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

textView = new TextView(this);

setContentView(textView);

 LifeCycleBinder.bind(this);

  
}

public void setText(String text) {

textView.setText(text);

  
}
 
}

The MyLifeCycleAware class must implement LifeCycleAware interface, the class DefaultLifeCycleAware can be used to override only some methods:

public class MyLifeCycleAware extends DefaultLifeCycleAware<MyActivity> {

  @Override
  public void onCreate(MyActivity view, Bundle savedInstanceState, Intent intent, Bundle arguments) {

view.setText("Hello world!");

  
}
 
}

The first parameter of LifeCycleAware methods is always the Activity or the Fragment. An interface or a base class can be used to avoid dependency to Android classes. The other parameters are usually the same parameters of the corresponding Activity/Fragment method, there are two exceptions:

  • onCreate method contains the Activity intent and a Bundle (it can be the Activity intent bundle or the Fragment arguments);
  • onDestroy method contains a changingConfigurations parameters.

Using LifeCycleBinder it's easy to manage retained objects, we can create an Activity with a Callable field annotated with @RetainedObjectProvider:

@RetainedObjectProvider Callable<MyRetainedLifeCycleAware> myFactory = () -> new MyRetainedLifeCycleAware();

In this example a MyRetainedLifeCycleAware object is created on the first start, all the callbacks are invoked on this object. If the Activity/Fragment is destroyed for a configuration change the object is retained. In case we need to use this object directly we can create a field and add the field name as parameter to the @RetainedObjectProvider annotation:

MyRetainedLifeCycleAware myRetainedLifeCycleAware;  @RetainedObjectProvider("myRetainedLifeCycleAware") Callable<MyRetainedLifeCycleAware> myFactory = () -> new MyRetainedLifeCycleAware();

LifeCycleAware interface contains the methods to manage option menu:

  • boolean hasOptionsMenu(T view)
  • void onCreateOptionsMenu(T view, Menu menu, MenuInflater inflater)
  • boolean onOptionsItemSelected(T view, MenuItem item)

Activity navigation can be managed using LifeCycleBinder, LifeCycleAware interface contains onActivityResult method that it's invoked when an Activity returns. LifeCycleBinder class contains a static method startActivityForResult, you need to use this method passing the Activity/Fragment to receive the callback.

How does it work under the hood?

LifeCycleBinder creates a new Fragment with no user interface and adds it to the Activity or the Fragment. This new Fragment manages the lifecycle and invokes the methods on the registered objects. Annotated objects are collected using an annotation processor.

Retained objects are managed using a Loader associated to the Fragment.

LifeCycleBinder depends on support-v4 v24, it uses the new method commitNow to dynamically add the Fragment.

Dagger support

LifeCycleBinder can be easily used on objects managed by Dagger 2. @BindLifeCycle works on fields populated using @Inject annotation, @RetainedObjectProvider can be used on Provider fields. The previous examples can be rewritten using Dagger:

@Inject @BindLifeCycle MyLifeCycleAware myLifeCycleAware;  MyRetainedLifeCycleAware myRetainedLifeCycleAware;  @Inject @RetainedObjectProvider("myRetainedLifeCycleAware") Provider<MyRetainedLifeCycleAware> myFactory;

JitPack configuration

LifeCycleBinder is available on JitPack, add the JitPack repository in your build.gradle (in top level dir):

repositories {

  jcenter()
  maven {
 url "https://jitpack.io" 
}
 
}

and the dependency in the build.gradle of the module:

dependencies {

  annotationProcessor 'com.github.fabioCollini.lifecyclebinder:lifecyclebinder-processor:0.3.2'
  compile 'com.github.fabioCollini.lifecyclebinder:lifecyclebinder-lib:0.3.2' 
}

License

Copyright 2016 Fabio Collini  Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 

Resources

DebugKit lib for Android allows you to use a fancy hovering debug tool to trigger some actions directly in the app. This tool is very useful to trigger some event at runtime, and to have a written feedback directly on your testing phone screen.

Traceur enables easier debugging of RxJava2 exceptions, by appending the source of any asynchronous calls to the original exception.

Lyra is a library that can save and restore the state of Android components easily through annotations. It will replace all the boilerplate code from onSaveInstanceState() to save and restore the state of your variables.

An user-friendly numerical input interface. It can easily be customized and is built to be used on Android-TV as well.

This library support nested scroll for refresh and load more, so you can use it with CoordinatorLayout and AppBarLayout and so no..

BackStack is a light weight android navigation library for view based navigation. It supports animations and multiple multipage containers like bottom bars and view pagers.

Topics


2D Engines   3D Engines   9-Patch   Action Bars   Activities   ADB   Advertisements   Analytics   Animations   ANR   AOP   API   APK   APT   Architecture   Audio   Autocomplete   Background Processing   Backward Compatibility   Badges   Bar Codes   Benchmarking   Bitmaps   Bluetooth   Blur Effects   Bread Crumbs   BRMS   Browser Extensions   Build Systems   Bundles   Buttons   Caching   Camera   Canvas   Cards   Carousels   Changelog   Checkboxes   Cloud Storages   Color Analysis   Color Pickers   Colors   Comet/Push   Compass Sensors   Conferences   Content Providers   Continuous Integration   Crash Reports   Credit Cards   Credits   CSV   Curl/Flip   Data Binding   Data Generators   Data Structures   Database   Database Browsers   Date &   Debugging   Decompilers   Deep Links   Dependency Injections   Design   Design Patterns   Dex   Dialogs   Distributed Computing   Distribution Platforms   Download Managers   Drawables   Emoji   Emulators   EPUB   Equalizers &   Event Buses   Exception Handling   Face Recognition   Feedback &   File System   File/Directory   Fingerprint   Floating Action   Fonts   Forms   Fragments   FRP   FSM   Functional Programming   Gamepads   Games   Geocaching   Gestures   GIF   Glow Pad   Gradle Plugins   Graphics   Grid Views   Highlighting   HTML   HTTP Mocking   Icons   IDE   IDE Plugins   Image Croppers   Image Loaders   Image Pickers   Image Processing   Image Views   Instrumentation   Intents   Job Schedulers   JSON   Keyboard   Kotlin   Layouts   Library Demos   List View   List Views   Localization   Location   Lock Patterns   Logcat   Logging   Mails   Maps   Markdown   Mathematics   Maven Plugins   MBaaS   Media   Menus   Messaging   MIME   Mobile Web   Native Image   Navigation   NDK   Networking   NFC   NoSQL   Number Pickers   OAuth   Object Mocking   OCR Engines   OpenGL   ORM   Other Pickers   Parallax List   Parcelables   Particle Systems   Password Inputs   PDF   Permissions   Physics Engines   Platforms   Plugin Frameworks   Preferences   Progress Indicators   ProGuard   Properties   Protocol Buffer   Pull To   Purchases   Push/Pull   QR Codes   Quick Return   Radio Buttons   Range Bars   Ratings   Recycler Views   Resources   REST   Ripple Effects   RSS   Screenshots   Scripting   Scroll Views   SDK   Search Inputs   Security   Sensors   Services   Showcase Views   Signatures   Sliding Panels   Snackbars   SOAP   Social Networks   Spannable   Spinners   Splash Screens   SSH   Static Analysis   Status Bars   Styling   SVG   System   Tags   Task Managers   TDD &   Template Engines   Testing   Testing Tools   Text Formatting   Text Views   Text Watchers   Text-to   Toasts   Toolkits For   Tools   Tooltips   Trainings   TV   Twitter   Updaters   USB   User Stories   Utils   Validation   Video   View Adapters   View Pagers   Views   Watch Face   Wearable Data   Wearables   Weather   Web Tools   Web Views   WebRTC   WebSockets   Wheel Widgets   Wi-Fi   Widgets   Windows   Wizards   XML   XMPP   YAML   ZIP Codes