第一步：匯入相關包

//butterknife
compile 'com.jakewharton:butterknife:8.4.0'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
//retrofit
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
// okHttp
 
compile 'com.squareup.okhttp3:okhttp:3.4.1'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
//picasso
compile 'com.squareup.picasso:picasso:2.5.2'

public class OkHttpManager {
    /**
     * OkHttpClient的封裝
     */
public OkHttpClient okHttpClient
 
() {
        // log用攔截器
HttpLoggingInterceptor logger = new HttpLoggingInterceptor();
// 開發模式記錄整個body，否則只記錄基本資訊如返回200，http協議版本等
        // 如果使用到HTTPS，我們需要建立SSLSocketFactory，並設定到client
        // SSLSocketFactory sslSocketFactory = null;
logger.setLevel(HttpLoggingInterceptor.Level.BODY);
        return new OkHttpClient.Builder()
                // HeadInterceptor實現了Interceptor，用來往Request Header新增一些業務相關資料，如APP版本，token資訊
 
                //.addInterceptor(new HeadInterceptor())
.addInterceptor(logger)//新增攔截器
.connectTimeout(10, TimeUnit.SECONDS) // 連線超時時間設定
.readTimeout(10, TimeUnit.SECONDS) // 讀取超時時間設定
.build();
}

    /**
     * Retrofit的封裝
     */
public Retrofit getRetrofit(OkHttpClient okHttpClient) {

        Retrofit.Builder builder = new Retrofit.Builder()
                .baseUrl(ApiServer.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(okHttpClient);//不設定則使用的是預設的OKHttpClient
return builder.build();
}
}

private String icon;
private int appendSize;
private String displayName;

private boolean hasMore;
private int status;
private String message;
private List<T> datas;

public interface ApiServer {
    public static final String BASE_URL = "http://112.124.22.238:8081/course_api/cniaoplay/";
//完整URL：http://112.124.22.238:8081/course_api/cniaoplay/featured?p={"page":0}
@GET("featured")
    Call<PageBean<AppInfo>> getApps(@Query("p") String jsonParms);
}

private void initRetrofit() {
    OkHttpManager httpManager = new OkHttpManager();
ApiServer apiServer = httpManager.getRetrofit(httpManager.okHttpClient())
            .create(ApiServer.class);
apiServer.getApps("{'page':0}").enqueue(new Callback<PageBean<AppInfo>>() {
        @Override
public void onResponse(Call<PageBean<AppInfo>> call, Response<PageBean<AppInfo>> response) {
            PageBean<AppInfo> body = response.body();
List<AppInfo> datas = body.getDatas();
Log.e(TAG,datas.toString());
//設定介面卡
initData(datas);
}

        @Override
public void onFailure(Call<PageBean<AppInfo>> call, Throwable t) {

        }
    });
}

public class GameAdapter extends RecyclerView.Adapter<GameAdapter.ViewHolder> {

    private Context mContext;
    private List<AppInfo> appInfos;
    private LayoutInflater mLayoutInflater;
    public GameAdapter(Context context, List<AppInfo> appInfos) {
        this.mContext = context;
        this.appInfos = appInfos;
mLayoutInflater = LayoutInflater.from(context);
}

    @Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ViewHolder(mLayoutInflater.inflate(R.layout.item_game, null));
}

    @Override
public void onBindViewHolder(ViewHolder holder, int position) {
        AppInfo appInfo = appInfos.get(position);
String baseImgUrl ="http://file.market.xiaomi.com/mfc/thumbnail/png/w150q80/";
Picasso.with(mContext).load(baseImgUrl +appInfo.getIcon()).into(holder.imgIcon);
holder.textTitle.setText(appInfo.getDisplayName());
holder.textSize.setText((appInfo.getApkSize() / 1024 /1024) +" MB");
}



    @Override
public int getItemCount() {
        return appInfos.size();
}

    class ViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.img_icon)
        ImageView imgIcon;
@BindView(R.id.text_title)
        TextView textTitle;
@BindView(R.id.text_size)
        TextView textSize;
@BindView(R.id.btn_dl)
        Button btnDl;
        public ViewHolder(View itemView) {
            super(itemView);
ButterKnife.bind(this, itemView);
}
    }
}

private void initData(List<AppInfo> datas) {
    recylerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
recylerView.setItemAnimator(new DefaultItemAnimator());
adapter=new GameAdapter(MainActivity.this,datas);
recylerView.setAdapter(adapter);
}