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https://github.com/BlackBoxVision/mvp-helpers
♻️Helper classes to build Android Apps through MVP pattern in a faster way
https://github.com/BlackBoxVision/mvp-helpers
android java library mvp-architecture mvp-clean mvp-pattern
Last synced: 3 months ago
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♻️Helper classes to build Android Apps through MVP pattern in a faster way
- Host: GitHub
- URL: https://github.com/BlackBoxVision/mvp-helpers
- Owner: BlackBoxVision
- License: mit
- Created: 2016-11-24T21:16:05.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2017-05-21T23:03:11.000Z (about 7 years ago)
- Last Synced: 2024-02-21T23:38:57.214Z (4 months ago)
- Topics: android, java, library, mvp-architecture, mvp-clean, mvp-pattern
- Language: Java
- Homepage:
- Size: 2.62 MB
- Stars: 42
- Watchers: 7
- Forks: 12
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- my-awesome-starred - BlackBoxVision/mvp-helpers - ♻️Helper classes to build Android Apps through MVP pattern in a faster way (Java)
README
> Helper classes to build Android Apps through MVP pattern in a faster way
[](https://opensource.org/licenses/MIT) []() [](https://jitpack.io/#BlackBoxVision/mvp-helpers) [](https://travis-ci.org/BlackBoxVision/mvp-helpers)
**This library exposes a minimal API, that should help you to build well architected Android Apps. ¡Check the following steps to get up and running!**
## Installation
Actually I don't have this library in **JCenter/Maven Central**, so if you want to use, follow the instructions. The library is distributed for Java and Kotlin. Looking for Kotlin variant? [Go here](https://github.com/BlackBoxVision/mvp-helpers/tree/kotlin)
**Gradle**
- Add it in your root build.gradle at the end of repositories:
```gradle
allprojects {
repositories {
...
maven {
url "https://jitpack.io"
}
}
}
```
- Add the dependency:
```gradle
dependencies {
compile 'com.github.BlackBoxVision:mvp-helpers:v0.2.0'
}
```
**Maven**
- Add this line to repositories section in pom.xml:
```xml
jitpack.io
https://jitpack.io
```
- Add the dependency:
```xml
com.github.BlackBoxVision
mvp-helpers
v0.2.0
```
**SBT**
- Add it in your build.sbt at the end of resolvers:
```sbt
resolvers += "jitpack" at "https://jitpack.io"
```
- Add the dependency:
```sbt
libraryDependencies += "com.github.BlackBoxVision" % "mvp-helpers" % "v0.2.0"
```
## Core Concepts
The concepts behind this library are the following ones:
- **View** → The **View** is an interface that contains methods related to UI interaction. Those methods should be implemented in your **Activity, Fragment or View**.
- **Interactor** → The **Interactor** is the class that do the hard work, all the blocking operations like **I/O, Networking, Database** Intectations should be done here.
- **Presenter** → The **presenter** acts as a middle man between the **Interactor** and the **View**.
## Usage example
The usage is really simple:
**1** - Create your **View** interface by extending the [**BaseView**](https://github.com/BlackBoxVision/mvp-helpers/blob/master/library/src/main/java/io/blackbox_vision/mvphelpers/logic/view/BaseView.java). **BaseView** is an empty interface that acts as water mark for the **Presenter**.
```java
public interface DetailsView extends BaseView {
void onInfoReceived(@NonNull Bundle information);
void onInfoError(@NonNull String errorMessage);
}
```
**2** - Create an **Interactor** class by extending the [**BaseInteractor**](https://github.com/BlackBoxVision/mvp-helpers/blob/master/library/src/main/java/io/blackbox_vision/mvphelpers/logic/interactor/BaseInteractor.java) class. The **BaseInteractor** provides you a set of helper methods to deal with **background execution and UIThread interaction**. The methods are the following ones:
- **runOnUiThread** → use it when you need to post data to the main thread.
- **runOnBackground** → use it when you need to make background processing.
- **runOnBackground** → use it when you need to make a scheduled task.
- **cancelTask** → use it when you want to cancel a scheduled task.
```java
//This example uses Java 8 features, I assume the usage of retrolambda
public final class DetailsInteractor extends BaseInteractor {
public void retrieveDetailsFromService(@NonNull final String id, @NonNull final OnSuccessListener successListener, @NonNull final OnErrorListener errorListener) {
runOnBackground(() -> {
//Getting data from somewhere
final Bundle data = MockUtils.getMockedData(id);
runOnUiThread(() -> {
if (data != null) {
successListener.onSuccess(data);
} else {
errorListener.onError("Ups, something went wrong");
}
});
});
}
}
```
**3** - Create a **Presenter** class by extending the [**BasePresenter**](https://github.com/BlackBoxVision/mvp-helpers/blob/master/library/src/main/java/io/blackbox_vision/mvphelpers/logic/presenter/BasePresenter.java) class. The **BasePresenter** provides you with a set of helper methods to deal with **View** management. The methods are the following ones:
- **isViewAttached** → check if you have set the view to the presenter, returns to you a boolean value that you should handle in your presenter implementation.
- **attachView** → add the view to the presenter, so you can start to handle the cycle of view - presenter - interactor interaction.
- **detachView** → dereference the view, setting it to null. This method should be called in the onDestroy method in case of use in Activity, and onDestroyView in case of Fragment usage.
- **getView** → simple getter, to make your access to the view defined more cleaner.
- **onViewAttached** → callback fired when the view is attached to the presenter, it gives you the view so you can start doing something like restoring state, instantiating the interactors.
- **onViewDetached** → callback fired when the view is detached from the presenter, in this place you can dereference the objects you won't use anymore.
```java
//I use method references from Java 8 to point the callbacks to interactor, I assume a working project with Retrolambda
public final class DetailsPresenter extends BasePresenter {
private DetailsInteractor interactor;
@Override
protected void onViewAttached(@NonNull DetailsView view) {
interactor = new DetailsInteractor();
}
@Override
protected void onViewDetached() {
interactor = null;
}
public void findRequiredInformation(@NonNull String id) {
if (isViewAttached()) {
interactor.retrieveDetailsFromService(id, this::onSuccess, this::onError);
}
}
private void onSuccess(@NonNull Bundle information) {
if (isViewAttached()) {
getView().onInfoReceived(information);
}
}
private void onError(@NonNull String errorMessage) {
if (isViewAttached()) {
getView().onInfoError(errorMessage);
}
}
}
```
**4** - Create a custom **PresenterFactory** class to provide the presenter instance. You should implement the [**PresenterFactory**](https://github.com/BlackBoxVision/mvp-helpers/blob/master/library/src/main/java/io/blackbox_vision/mvphelpers/logic/factory/PresenterFactory.java) interface.
**Now we have to create a Factory, because I have recently implemented a way to not loose presenter when configuration changes. The BaseActivity/BaseFragment use a Loader to provide the Presenter instance, Android Loaders can survive configuration changes, that's why I select them.**
```java
class DetailsPresenterFactory implements PresenterFactory {
@Override
public DetailsPresenter create() {
return new DetailsPresenter();
}
}
```
**5** - Attach this cycle with Android specific classes. You can choice an **Activity/Fragment or also a custom view**. In this case I will show you an example with **Fragment** that inherits from [**BaseFragment**](https://github.com/BlackBoxVision/mvp-helpers/blob/master/library/src/main/java/io/blackbox_vision/mvphelpers/ui/fragment/BaseFragment.java)
The **BaseFragment** comes with a resumed lifecycle, and a set of methods to implement. The methods are the following ones:
- **createPresenterFactory** → in this method you have to create an instance of PresenterFactory.
- **getLayout** → in this method you have pass the id reference to the layout.
- **getPresenter** → simple getter, to make your access to the presenter more cleaner.
- **onPresenterCreated** → In this method you can start doing something with the presenter. **¡Now the View is attached automatically to the Presenter!**
- **onPresenterDestroyed** → In this method you can do something, like saving app state.
```java
public final class DetailsFragment extends BaseFragment implements DetailsView {
@Override
protected DetailsPresenterFactory createPresenterFactory() {
return new DetailsPresenterFactory();
}
@LayoutRes
@Override
protected int getLayout() {
return R.layout.fragment_details;
}
@Override
protected void onPresenterCreated(@NonNull DetailsPresenter presenter) {
//Do something when presenter it's created
getPresenter().getInformationFromId("ssdWRGD132");
}
@Override
protected void onPresenterDestroyed() {
//Do something when presenter is removed, this method is called in onDestroy
}
@Override
void onInfoReceived(@NonNull Bundle information) {
Toast.makeText(getContext(), information.toString(), Toast.LENGTH_SHORT).show();
}
@Override
void onInfoError(@NonNull String errorMessage) {
Toast.makeText(getContext(), errorMessage, Toast.LENGTH_SHORT).show();
}
}
```
## Advise about ButterKnife
From version **0.2.0 of this library**, I have decided to remove butterKnife, in order to not force any dev to use butterKnife.
## Issues
If you found a bug, or you have an answer, or whatever. Please, open an [issue](https://github.com/BlackBoxVision/mvp-helpers/issues). I will do the best to fix it, or help you.
## Contributing
Of course, if you see something that you want to upgrade from this library, or a bug that needs to be solved, **PRs are welcome!**
## Release History
* **0.2.0**
* **CHANGE**: **BasePresenter** has now two new callbacks, to be notified about **view attachment/detachment**.
* **CHANGE**: **BaseActivity/BaseFragment** has now two new callbacks to be notified about **presenter creation/destruction**, also, **addPresenter** callback has been replace with **createPresenterFactory**
* **CHANGE**: Added **PresenterFactory** interface to create custom factories to provide presenter instances
* **CHANGE**: Added **PresenterLoader**, an Android Loader, that provides the presenter instance and survives configuration changes.
* **BUG FIX**: Fixed issue with **BaseInteractor runOnBackground method**, this method was calling **executor.isTerminated** instead of calling **executor.isShutdown**, this produce a RuntimeException, because of troubles with ThreadPool reuse. Also, the methods have been refactored, to use a **ExecutorService** to get more control instead of an **Executor**.
* **0.1.0**
* **CHANGE**: Folder refactor under **UI package**
* **CHANGE**: Modified **BasePresenter** method **registerView** to **attachView** in order to get more consistence
* **CHANGE**: Added new **runOnBackground** version in **BaseInteractor** that uses a ScheduledExecutorService and also cancel method to stop execution
* **CHANGE**: Added Custom Views to extend **BaseRelativeLayout, BaseFrameLayout and BaseLinearLayout**
* **0.0.3**
* **CHANGE**: Removed **ButterKnife** annotation processor
* **CHANGE**: Rename **mvphelper** library to library
* **0.0.2**
* **CHANGE**: Minor updates
* **0.0.1**
* Work in progress
## License
Distributed under the **MIT license**. See [LICENSE](https://github.com/BlackBoxVision/mvp-helpers/blob/master/LICENSE) for more information.