ViewPager实现最后一个页面出现按钮

一,在布局中引入控件ViewPager和一个按钮

    android:id="@+id/vp_show"

    android:layout_width="match_parent"

    android:layout_height="wrap_content" />

    android:id="@+id/btn_next"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_centerHorizontal="true"

    android:layout_marginTop="600dp"

    android:text="完成"

    android:visibility="invisible" />先将按钮设置为隐藏

二,在Activity中添加布局

final ArrayList views =new ArrayList<>();

View view = LayoutInflater.from(this).inflate(R.layout.item_pop,null);

for (int i =1; i <4; i++) {

views.add(view);

}

三,适配器(继承PagerAdapter)

private Contextcontext;

private ArrayListviews;

public VpAdapter(Context context, ArrayList views) {

this.context = context;

this.views = views;

}

@Override

    public int getCount() {

        return views.size();

}

@Override

    public boolean isViewFromObject(@NonNull View view,@NonNull Object object) {

        return view == object;

}

@NonNull

@Override

    public Object instantiateItem(@NonNull ViewGroup container,int position) {

            View view = LayoutInflater.from(context).inflate(R.layout.item_pop,null);

            TextView tv_num = view.findViewById(R.id.tv_num);

            tv_num.setText((position +1) +"/" +views.size());

            container.addView(view);

    return view;

}

@Override

    public void destroyItem(@NonNull ViewGroup container,int position,@NonNull Object object) {

            container.removeView((View) object);

    }

}

四,绑定适配器

VpAdapter adapter =new VpAdapter(this, views);

vp_show.setAdapter(adapter);

五,设置监听方法判断是否到了最后一个页面

vp_show.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

@Override

        public void onPageScrolled(int position,float positionOffset,int positionOffsetPixels) {

}

@Override

        public void onPageSelected(int position) {

                if (views.size() -1 == position) {

                        btn_next.setVisibility(View.VISIBLE);//显示

                }else {

                        btn_next.setVisibility(View.GONE);//隐藏

                }

}

@Override

        public void onPageScrollStateChanged(int state) {

}

});

}

六,给按钮设置监听跳转到指定页面

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.btn_next:

Intent intent =new Intent(ShowActivity.this, DataActivity.class);

startActivity(intent);

break;

}

}