recyclerView和retrofit的简单使用

第一步：导入相关包

//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'

第二步：对retrofit进行简单封装，不懂的可以看下官网http://square.github.io/retrofit/

public class OkHttpManager {
    /**
     * OkHttpClient的封装
     */

    public OkHttpClient okHttpClient() {
        // log用拦截器
        HttpLoggingInterceptor logger = new HttpLoggingInterceptor();
        // 开发模式记录整个body，否则只记录基本信息如返回200，http协议版本等

        // 如果使用到HTTPS，我们需要创建SSLSocketFactory，并设置到client
        // SSLSocketFactory sslSocketFactory = null;
        logger.setLevel(HttpLoggingInterceptor.Level.BODY);
        return new OkHttpClient.Builder()
                // HeadInterceptor实现了Interceptor，用来往Request Header添加一些业务相关数据，如APP版本，token信息
                //.addInterceptor(new HeadInterceptor())
                .addInterceptor(logger)//添加拦截器
                .connectTimeout(10, TimeUnit.SECONDS) // 连接超时时间设置
                .readTimeout(10, TimeUnit.SECONDS) // 读取超时时间设置
                .build();

    }

    /**
     * Retrofit的封装
     */

    public Retrofit getRetrofit(OkHttpClient okHttpClient) {

        Retrofit.Builder builder = new Retrofit.Builder()
                .baseUrl(ApiServer.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(okHttpClient);//不设置则使用的是默认的OKHttpClient
        return builder.build();

    }
}

第三步：对详细信息进行封装（AppInfo）：

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

第四步:对所有信息进行封装(PageBean):

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

第五步：定义Retrofit的接口

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);
}

第六步：执行Retrofit：

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());
            //设置适配器
            initData(datas);
        }

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

        }
    });
}

第七步：定义RecyclerVeiw的适配器

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);
        }
    }
}

第八步：MainActivity中recycleview设置配置器

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);
}