使用MVP模式+Retrofit+Fresco加载网络数据

今天写了一个使用MVP架构模式的网络请求数据的Demo，网络请求的是使用了Retrofit请求

自带了Gson解析，Fresco加载网络图片,使用recyclerview展示数据。首先，先把需要用到的依赖导入

compile 'com.android.support:appcompat-v7:26.+'    compile 'com.android.support.constraint:constraint-layout:1.0.2'    testCompile 'junit:junit:4.12'    compile 'com.android.support:recyclerview-v7:26.+'    compile 'com.squareup.okhttp3:okhttp:3.9.0'    compile 'com.squareup.retrofit2:retrofit:2.3.0'    compile 'com.squareup.retrofit2:converter-gson:2.3.0'    compile 'io.reactivex.rxjava2:rxjava:2.1.6'    compile 'com.squareup.retrofit2:adapter-rxjava:2.3.0'    compile 'com.facebook.fresco:fresco:1.5.0'

先做准备工作，建立一个App,初始化Fresco

public class App extends Application {    @Override    public void onCreate() {        super.onCreate();        Fresco.initialize(this);    }}

不要忘了在清单文件里面配置App，还有不要忘了加网络权限，

main_layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.a1106lianxi.MainActivity">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="50dp"        android:background="#FF4081">        <TextView            android:id="@+id/tv_f"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_centerVertical="true"            android:paddingLeft="10dp"            android:paddingRight="10dp"            android:text="←"            android:textColor="#ffffff"            android:textSize="30sp" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:layout_centerVertical="true"            android:paddingLeft="10dp"            android:paddingRight="15dp"            android:text="我的收藏"            android:textColor="#ffffff"            android:textSize="15sp" />        <TextView            android:id="@+id/tv_bian"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:layout_centerVertical="true"            android:paddingLeft="10dp"            android:paddingRight="15dp"            android:text="编辑"            android:textColor="#ffffff"            android:textSize="15sp" />    </RelativeLayout>    <FrameLayout        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1">        <android.support.v7.widget.RecyclerView            android:id="@+id/rv"            android:layout_width="match_parent"            android:layout_height="match_parent">        </android.support.v7.widget.RecyclerView>    </FrameLayout></LinearLayout>

布局写好了再去实现view层的接口，然后MainActivity实现接口，重写接口的方法

public interface IMusicView {    public void showData(List<MusicBean.SongListBean> bean);}

model创建接口，实现方法

public interface IMusicModel {    public Retrofit getUrl(String path);}

这里用到了一个拦截器，数据源必须加这个拦截器才能出数据

public class LoggingInterceptor implements Interceptor {    private static final String UA = "User-Agent";    @Override    public Response intercept(Chain chain) throws IOException {        Request request = chain.request()                .newBuilder()                .addHeader(UA, makeUA())                .build();        return chain.proceed(request);    }    private String makeUA() {        String s = Build.BRAND + "/" + Build.MODEL + "/" + Build.VERSION.RELEASE;        return Build.BRAND + "/" + Build.MODEL + "/" + Build.VERSION.RELEASE;    }}

把这个拦截器加到Retrofit里面去

public class MusicModel implements IMusicModel {    @Override    public Retrofit getUrl(String path) {        OkHttpClient client = new OkHttpClient.Builder()                .addInterceptor(new LoggingInterceptor())                .build();        Retrofit retrofit = new Retrofit.Builder()                .baseUrl(path)                .addConverterFactory(GsonConverterFactory.create())                .client(client)                .build();        return retrofit;    }}

presenter

public class MusicPresenter {    Context context;    IMusicModel model;    IMusicView view;    List<MusicBean.SongListBean> list;    public MusicPresenter(Context context, IMusicView view) {        this.context = context;        this.view = view;        model = new MusicModel();    }    public void showdata(){        Retrofit rf = model.getUrl("http://tingapi.ting.baidu.com/");        MusicService ms = rf.create(MusicService.class);        ms.getda().enqueue(new Callback<MusicBean>() {            @Override            public void onResponse(Call<MusicBean> call, Response<MusicBean> response) {                MusicBean mb = response.body();                list = new ArrayList<MusicBean.SongListBean>();                list.addAll(mb.getSong_list());                Log.i("+++++list++++++", "onResponse: "+list.toString());                view.showData(list);            }            @Override            public void onFailure(Call<MusicBean> call, Throwable t) {            }        });    }}

需要创建一个service接口

public interface MusicService {    @GET("v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=20&offset=0")    Call<MusicBean> getda();}

注解的方式
创建recyclerview适配器，创建子布局

public class MusicAdapter extends RecyclerView.Adapter<MusicAdapter.MyViewHolder> {    List<MusicBean.SongListBean> list;    Context context;    public MusicAdapter(List<MusicBean.SongListBean> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = View.inflate(context, R.layout.item,null);        MyViewHolder holder = new MyViewHolder(view);        return holder;    }    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        holder.tv.setText(list.get(position).getTitle());        Uri uri = Uri.parse(list.get(position).getPic_small());        holder.iv.setImageURI(uri);    }    @Override    public int getItemCount() {        return list == null ? 0 : list.size();    }    class MyViewHolder extends RecyclerView.ViewHolder {        TextView tv;        ImageView iv;        public MyViewHolder(View itemView) {            super(itemView);            tv = itemView.findViewById(R.id.tv_title);            iv = itemView.findViewById(R.id.iv_title);        }    }}

布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal">    <com.facebook.drawee.view.SimpleDraweeView        android:id="@+id/iv_title"        android:layout_width="200dp"        android:layout_height="200dp"        android:layout_gravity="center"        android:src="@mipmap/ic_launcher"/>    <TextView        android:id="@+id/tv_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text="哈哈哈哈哈哈哈哈哈"/></LinearLayout>

主方法调用，与presenter交互

public class MainActivity extends Activity implements IMusicView, View.OnClickListener {    private RecyclerView rv;    List<MusicBean.SongListBean> mlist;    private TextView mFTv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        MusicPresenter presenter = new MusicPresenter(this, this);        presenter.showdata();    }    private void initView() {        rv = (RecyclerView) findViewById(R.id.rv);        mFTv = (TextView) findViewById(R.id.tv_f);        mFTv.setOnClickListener(this);    }    @Override    public void showData(List<MusicBean.SongListBean> bean) {        mlist = bean;        rv.setLayoutManager(new LinearLayoutManager(this));        MusicAdapter adapter = new MusicAdapter(mlist, this);        rv.setAdapter(adapter);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.tv_f:                Tuichu();                break;            default:                break;        }    }    private void Tuichu() {        new AlertDialog.Builder(this)                .setTitle("确认")                .setMessage("确认要删除吗?")                .setPositiveButton("是", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialogInterface, int i) {                        finish();                    }                })                .setNegativeButton("否", null)                .show();    }}