使用MVP模式+Retrofit+Fresco載入網路資料
阿新 • • 發佈：2019-01-31
今天寫了一個使用MVP架構模式的網路請求資料的Demo，網路請求的是使用了Retrofit請求
自帶了Gson解析，Fresco載入網路圖片,使用recyclerview展示資料。首先，先把需要用到的依賴匯入
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'
先做準備工作，建立一個App,初始化Fresco
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
Fresco.initialize(this);
}
}不要忘了在清單檔案裡面配置App，還有不要忘了加網路許可權，
main_layout
佈局寫好了再去實現view層的介面，然後MainActivity實現介面，重寫介面的方法<?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="編輯" 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>
public interface IMusicView {
public void showData(List<MusicBean.SongListBean> bean);
}public interface IMusicModel {
public Retrofit getUrl(String path);
}把這個攔截器加到Retrofit裡面去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; } }
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) {
}
});
}
}需要建立一個service介面
public interface MusicService {
@GET("v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=20&offset=0")
Call<MusicBean> getda();
}建立recyclerview介面卡，建立子佈局
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);
}
}
}
佈局
<?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>主方法呼叫，與presenter互動
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("確認")
.setMessage("確認要刪除嗎?")
.setPositiveButton("是", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
})
.setNegativeButton("否", null)
.show();
}
}