第三方库之 banner

Android 广告图片轮播控件，支持无限循环和多种主题，可以灵活设置轮播样式、动画、轮播和切换时间、位置、图片加载框架等！

目前最新的版本是 2.2.2。
GitHub：banner

效果图

001.png

使用

1. 在 app/build.gradle 文件下添加依赖：

    implementation 'io.github.youth5201314:banner:2.2.2'
    //glide
    implementation 'com.github.bumptech.glide:glide:4.12.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'

2. 在 AndroidManifest.xml 文件中添加网络权限：

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

3. 在 main_activity.xml 布局文件中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.youth.banner.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        app:banner_loop_time="3000"
        app:banner_auto_loop="true"
        app:banner_radius="5dp"
        app:banner_indicator_normal_width="6dp"
        app:banner_indicator_normal_color="@color/teal_700"
        app:banner_indicator_selected_color="@color/teal_200"
        app:banner_indicator_gravity="center"/>

</LinearLayout>

4. 继承 BannerAdapter

/**
 * Created on 2021/8/28 14:59
 *
 * @author Gong Youqiang
 */
public class ImageAdapter extends BannerAdapter<String,ImageAdapter.BannerViewHolder> {
    public ImageAdapter(List<String> mDatas) {
        //设置数据，也可以调用banner提供的方法,或者自己在adapter中实现
        super(mDatas);
    }

    //创建ViewHolder，可以用viewType这个字段来区分不同的ViewHolder
    @Override
    public BannerViewHolder onCreateHolder(ViewGroup parent, int viewType) {
        ImageView imageView = new ImageView(parent.getContext());
        //注意，必须设置为match_parent，这个是viewpager2强制要求的
        imageView.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        return new BannerViewHolder(imageView);
    }

    @Override
    public void onBindView(BannerViewHolder holder, String data, int position, int size) {
        Glide.with(holder.itemView)
                .load(data)
                .apply(RequestOptions.bitmapTransform(new RoundedCorners(30)))
                .into(holder.imageView);
    }

    class BannerViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;

        public BannerViewHolder(@NonNull ImageView view) {
            super(view);
            this.imageView = view;
        }
    }
}

5. 具体方法调用

public class MainActivity extends BaseActivity {
    private Banner banner;
    private List<String> images;

    @Override
    protected int getLayoutId() {
        return R.layout.activity_main;
    }

    @Override
    protected void init(Bundle savedInstanceState) {
        initView();
    }

    private void initView() {
        initData();
        banner = findViewById(R.id.banner);

        banner.addBannerLifecycleObserver(this)//添加生命周期观察者
                .setAdapter(new ImageAdapter(images))
                .setIndicator(new CircleIndicator(this));

        banner.setOnBannerListener(new OnBannerListener() {
            @Override
            public void OnBannerClick(Object data, int position) {
                ToastUtils.show("click" + position);
            }
        });
        banner.setBannerGalleryMZ(60,0.8f);
    }

    @Override
    protected void onStart() {
        super.onStart();
        banner.start();
    }

    @Override
    protected void onStop() {
        super.onStop();
        banner.stop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        banner.destroy();
    }

    private void initData() {
        images = new ArrayList<>();
        images.add("https://ae01.alicdn.com/kf/U54ae3ae4e9ac4572a436c11a9cfa4927E.jpg");
        images.add("https://ae01.alicdn.com/kf/Uda72804a12f94aceb38a28fa6dde9eb3w.jpg");
        images.add("https://ae01.alicdn.com/kf/U5fac38377c6d434b94fd1bbab4e5e0efz.jpg");
        images.add("https://ae01.alicdn.com/kf/U6cdabb09d259457291dee1102d5d7a22i.jpg");
        images.add("https://ae01.alicdn.com/kf/U9a21a2f4b83c4030b87c840bc07105e5A.jpg");
        images.add("https://ae01.alicdn.com/kf/U8f29046315a345b488a91f19e0691d7bx.jpg");
    }

}