[AS2.3.3] MVP mode learning and as2.3.3mvp mode Learning

[AS2.3.3] MVP mode learning and as2.3.3mvp mode Learning

Some specific charts are not mentioned here! Start your learning journey directly.

1. Basic mvp mode implementation

The example is to access the URL to obtain the json string.

The network uses the network framework address implemented by rxjava2 + okttp3 + javasfit2.

The first is the mvp hierarchy.

M layer
Create an interface ITestModel and an implementation TestModelImpl

public interface ITestModel {    void getImgs(String url,ITestView view);}

public class TestModelImpl implements ITestModel{    @Override    public void getImgs(String url, final ITestView view) {        RORManager.getInstance()                .setUrl(url)                .create(ITestService.class)                .getImg(10,1)                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Consumer
 
  () {                    @Override                    public void accept(ResponseBody responseBody) throws Exception {                        String str = responseBody.string();                        ImgModel imgModel = new Gson().fromJson(str,ImgModel.class);                        List
  
    imgs = new ArrayList<>();                        for (ImgModel.ResultsBean resultsBean : imgModel.getResults()) {                            imgs.add(resultsBean.getUrl());                        }                        view.onSuccess(imgs);                    }                }, new Consumer
   
    () {                    @Override                    public void accept(Throwable throwable) throws Exception {                        view.onFail(throwable);                    }                });    }}
   
  
 

P Layer
Create an interface ITestPresenter and an implementation TestPresenterImpl

public interface ITestPresenter {    void getImg(String url);}

public class TestPresenterImpl implements ITestPresenter {    private ITestView view;    ITestModel model;    public TestPresenterImpl(ITestView view){        this.view = view;        model = new TestModelImpl();    }    @Override    public void getImg(String url) {        model.getImgs(url,view);    }}

V Layer
Create an interface.

public interface ITestView {    void onSuccess(List
 
   imgs);    void onFail(Throwable throwable);}
 

After creating the MVP structure, you can implement it.

Public class TestActivity extends AppCompatActivity implements ITestView {@ BindView (R. id. iv_test) ImageView imageView; String url = "https://gank.io/api/data/welfare/"; private int s = 0; private List
 
  
Imgs; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_test); ButterKnife. bind (this); TestPresenterImpl presenter = new TestPresenterImpl (this); presenter. getImg (url) ;}@ OnClick (R. id. btn_test) public void click () {s ++; if (s> 9) {s = 0;} setImg (imgs. get (s) ;}@ Override public void onSuccess (List
  
   
Imgs) {Toast. makeText (this, "successful! ", Toast. LENGTH_SHORT ). show (); this. imgs = imgs; setImg (imgs. get (0);} private void setImg (String s) {Glide. with (this ). load (s ). into (imageView) ;}@ Override public void onFail (Throwable throwable) {Toast. makeText (this, "error! ", Toast. LENGTH_SHORT). show ();}}
  
 

The Implementation Effect and program structure are as follows:

Here we have implemented the mvp loading function!

2. mvp mode General advanced

The above is just a method to implement. Here we can perform general advanced operations, that is, encapsulate the Activity layer.
First, create the following methods:

public interface IBaseMvpView {}

public interface IBaseMvpPresenter
 
   {    void onAttached(V view);    void onDetached();    boolean isAttached();    V getMvpView();}
 

public class BasePresenter
 
   implements IBaseMvpPresenter
  
    {    private V mvpView;    @Override    public void onAttached(V view) {        mvpView = view;    }    @Override    public void onDetached() {        mvpView = null;    }    @Override    public boolean isAttached() {        return mvpView != null;    }    @Override    public V getMvpView() {        return mvpView;    }}
  
 

public abstract class MvpActivity
 
  > extends AppCompatActivity {    protected P mPresenter;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mPresenter = getPresenter();        if (mPresenter == null) {            throw new NullPointerException("presenter is null.");        }        mPresenter.onAttached((V) this);    }    @Override    protected void onDestroy() {        if (mPresenter != null) {            mPresenter.onDetached();        }        super.onDestroy();    }    protected abstract P getPresenter();}
 

Then we will transform the interface and method of the old mvp hierarchy.
P Layer
TestPresenterImpl

public class TestPresenterImpl extends BasePresenter
 
   implements ITestPresenter {    ITestModel model;    public TestPresenterImpl(){        model = new TestModelImpl();    }    @Override    public void getImg(String url) {        model.getImgs(url,getMvpView());    }}
 

V Layer
ITestView

public interface ITestView extends IBaseMvpView{    void onSuccess(List
 
   imgs);    void onFail(Throwable throwable);}
 

Last modified TestActivity

Public class TestActivity extends MvpActivity
 
  
Implements ITestView {@ BindView (R. id. iv_test) ImageView imageView; String url = "https://gank.io/api/data/welfare/"; private int s = 0; private List
  
   
Imgs; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_test); ButterKnife. bind (this); mPresenter. getImg (url) ;}@ Override protected TestPresenterImpl getPresenter () {return new TestPresenterImpl () ;}@ OnClick (R. id. btn_test) public void click () {s ++; if (s> 9) {s = 0;} setImg (imgs. get (s) ;}@ Override public void onSuccess (List
   
    
Imgs) {Toast. makeText (this, "successful! ", Toast. LENGTH_SHORT ). show (); this. imgs = imgs; setImg (imgs. get (0);} private void setImg (String s) {Glide. with (this ). load (s ). into (imageView) ;}@ Override public void onFail (Throwable throwable) {Toast. makeText (this, "error! ", Toast. LENGTH_SHORT). show ();}}
   
  
 

This is a simple and advanced process for mvp members.

You only need to modify the getPresenter () method when performing the p-layer operation.