Android之Banner轮播图

1.添加网络权限和导入相关的依赖
1).网络权限

<uses-permission android:name="android.permission.INTERNET"/>

2).依赖

	//banner依赖
    implementation 'com.youth.banner:banner:1.4.10'
    // 最新版本
    implementation 'com.github.bumptech.glide:glide:4.8.0'//glide图片加载框架

2.创建封装类(比较简单,这里就不贴代码了)
3.创建一个接口(ApiService)(网络请求我使用的是RxJava+Retrofit,所以我这里讲的方法是RxJava+Retrofit的,当然网络请求你们也可以用其他的,我在这里只讲这一种方法)

	String path = "https://www.wanandroid.com/";
    @GET("banner/json")
    Observable<BannerBean> getBanner();

RxJava+Retrofit依赖:

	//RxJava和Retrofit依赖
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0' // 必要依赖，解析json字符所用
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0' // 必要依赖，和Rxjava结合必须用到，下面会提到
    implementation "io.reactivex.rxjava2:rxjava:2.1.3" // 必要rxjava2依赖
    implementation "io.reactivex.rxjava2:rxandroid:2.0.1"

4.适配器(我弄的多布局样式的适配器,但适配器目前只写了banner)

private Context context;
    private List<BannerBean.DataBean> data = new ArrayList<>();
    public static final int BANNER_TYPE = 0;

    public BannerAdapter(Context context) {
        this.context = context;
    }

    public void setData(List<BannerBean.DataBean> data) {
        this.data.addAll(data);
        notifyDataSetChanged();
    }

    @Override
    public int getItemViewType(int position) {
        if(position==0){
            return BANNER_TYPE;
        }
        return 0;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if(viewType==BANNER_TYPE){
            View inflate = LayoutInflater.from(context).inflate(R.layout.banner_item, parent, false);
            return new BannerViewHolder(inflate);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        int itemViewType = getItemViewType(position);
        if(itemViewType==0){
            BannerViewHolder bannerViewHolder = (BannerViewHolder) holder;
            bannerViewHolder.banner.setImages(data).setImageLoader(new ImageLoader() {
                @Override
                public void displayImage(Context context, Object path, ImageView imageView) {
                    BannerBean.DataBean bean = (BannerBean.DataBean) path;
                    Glide.with(context).load(bean.getImagePath()).into(imageView);
                }
            }).start();
        }
    }

    @Override
    public int getItemCount() {
        return data !=null ? 1:0;
    }

    private class BannerViewHolder extends RecyclerView.ViewHolder {
        Banner banner;
        public BannerViewHolder(View inflate) {
            super(inflate);
            banner = inflate.findViewById(R.id.banner);
        }
    }

5.banner_item的布局:

<com.youth.banner.Banner
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/banner"
        />

6.activity:布局是RecyclerView,这里就不贴代码了

	private RecyclerView recycler;
    private BannerAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initData();
    }

    private void initData() {
        Retrofit build = new Retrofit.Builder()
                .baseUrl(ApiService.path)
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        final ApiService apiService = build.create(ApiService.class);
        apiService.getBanner().subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<BannerBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(BannerBean bannerBean) {
                        List<BannerBean.DataBean> data = bannerBean.getData();
                        adapter.setData(data);
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }

    private void initView() {
        recycler = findViewById(R.id.recycler);
        recycler.setLayoutManager(new LinearLayoutManager(this));
        adapter = new BannerAdapter(this);
        recycler.setAdapter(adapter);
    }

好了,到这里就大功告成了,欢迎大家提出意见!

下面给大家找了一些banner的其他属性,具体其他的如果下面没有,那就自行百度吧!

本文地址：https://blog.csdn.net/qq_46237697/article/details/110185604