Retrofit+RxJava+Fresco简单实现数据展示

最新推荐文章于 2018-04-23 13:54:57 发布

原创最新推荐文章于 2018-04-23 13:54:57 发布 · 375 阅读

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本文介绍如何在Android应用中集成Fresco图片加载库与RecyclerView，实现高效图片展示。包括依赖添加、布局配置、接口定义、Fresco初始化、自定义适配器及MainActivity中的数据加载流程。

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1.首先我们要添加依赖

compile 'com.facebook.fresco:fresco:0.9.0+'
compile 'com.android.support:recyclerview-v7:25.0.0+'
compile 'com.squareup.retrofit2:retrofit:2.0.1'
compile 'com.squareup.retrofit2:converter-gson:2.0.1'
compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'
compile 'io.reactivex:rxandroid:1.1.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'

2.布局就是一个单纯的recyclerview ，子布局是一个图片和一个textview ，切记当我们使用了Fresco布局的时候我们就应该把Imageview改成SimpleDraweeView

<com.facebook.drawee.view.SimpleDraweeView
    android:id="@+id/image_view"
    android:src="@mipmap/ic_launcher"
    android:layout_width="50dp"
    android:layout_height="50dp" />

3.上代码首先我们创建一个接口用来拼接口

public interface RequestServes {

    @GET("news/latest")
    Observable<MyBean> getString();
}

4.Fresco需要一个APP初始化

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

5.上适配器

public class MyAdapter2 extends RecyclerView.Adapter<MyAdapter2.MyViewHodel> {

    private Context context;
    private MyBean myBean;

    public MyAdapter2(Context context, MyBean myBean) {
        this.context = context;
        this.myBean = myBean;
    }

    @Override
    public MyViewHodel onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(context , R.layout.item , null);
        return new MyViewHodel(view);
    }

    @Override
    public void onBindViewHolder(MyViewHodel holder, int position) {
        String s = myBean.getStories().get(position).getImages().get(0);
        Uri uri = Uri.parse(s);
        holder.imageView.setImageURI(uri);
        holder.textView.setText(myBean.getStories().get(position).getTitle());
    }

    @Override
    public int getItemCount() {
        List<MyBean.StoriesBean> stories = myBean.getStories();

        return myBean.getStories().size();
    }

    class MyViewHodel extends RecyclerView.ViewHolder{

        TextView textView;
        SimpleDraweeView imageView;
        public MyViewHodel(View itemView) {
            super(itemView);

            imageView = (SimpleDraweeView) itemView.findViewById(R.id.image_view);
            textView = (TextView) itemView.findViewById(R.id.text_view);
        }
    }
}

6.MainActivity

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private MyAdapter2 adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));


        Retrofit retrofit =new Retrofit.Builder()
                .baseUrl("http://news-at.zhihu.com/api/4/")
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();

        RequestServes requestServes = retrofit.create(RequestServes.class);
        Observable<MyBean> string = requestServes.getString();

         string .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<MyBean>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable throwable) {

                    }

                    @Override
                    public void onNext(MyBean myBean) {
                        recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
                        adapter = new MyAdapter2(MainActivity.this , myBean);
                        recyclerView.setAdapter(adapter);
                    }
                });

    }
}