Android之Banner輪播圖

1.添加網絡權限和導入相關的依賴
1).網絡權限

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

2).依賴

//banner依賴
    implementation 'com.youth.banner:banner:1.4.10'
    // 最新版本
    implementation 'com.github.bumptech.glide:glide:4.8.0'//glide圖片加載框架

2.建立封裝類(比較簡單,這裏就不貼代碼了)
3.建立一個接口(ApiService)(網絡請求我使用的是RxJava+Retrofit,因此我這裏講的方法是RxJava+Retrofit的,固然網絡請求大家也能夠用其餘的,我在這裏只講這一種方法)

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

RxJava+Retrofit依賴:

//RxJava和Retrofit依賴
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0' // 必要依賴，解析json字符所用
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0' // 必要依賴，和Rxjava結合必須用到，下面會提到
    implementation "io.reactivex.rxjava2:rxjava:2.1.3" // 必要rxjava2依賴
    implementation "io.reactivex.rxjava2:rxandroid:2.0.1"

4.適配器(我弄的多佈局樣式的適配器,但適配器目前只寫了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的佈局:

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

6.activity:佈局是RecyclerView,這裏就不貼代碼了

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,到這裏就大功告成了,歡迎你們提出意見!

下面給你們找了一些banner的其餘屬性,具體其餘的若是下面沒有,那就自行百度吧!