Android studio ViewPager2 底部圆点指示器应用设计

一、activity_main.xml布局文件：

<androidx.viewpager2.widget.ViewPager2
    android:id="@+id/viewpager2"
    android:layout_width="403dp"
    android:layout_height="442dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<LinearLayout
    android:layout_width="397dp"
    android:layout_height="40dp"
    android:background="#66000000"
    android:gravity="center"
    android:orientation="vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/viewpager2"
    app:layout_constraintVertical_bias="0.686">

    <LinearLayout
        android:id="@+id/layout_dot"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal">

    </LinearLayout>
</LinearLayout>

二、MainActivity.java:

三、Adapter：

private int[] images= new int[]{R.drawable.one,R.drawable.two,R.drawable.three,R.drawable.four};

    public ViewPager2Adapter(Context context, List<String> data, ViewPager2 viewPager2) {
        this.mInflater = LayoutInflater.from(context);
        this.list = data;
        this.viewPager2 = viewPager2;
    }

    @NonNull
    @Override
    public ViewPager2Adapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.view_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewPager2Adapter.ViewHolder holder, int position) {
        holder.viewImage.setImageResource(images[position]);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        RelativeLayout relativeLayout;
        ImageView viewImage;

        ViewHolder(View itemView) {
            super(itemView);
            viewImage = itemView.findViewById(R.id.imageView);
            relativeLayout = itemView.findViewById(R.id.container);


        }
    }

四、运行效果：

五、项目工程：

AndroidstudioViewPager2图片切换+底部圆点指示器应用设计资源-CSDN文库