图片轮播：跳出隐藏按钮：点击跳转

例：

图片轮播完：跳出隐藏按钮：点击跳转新的页面（图片自己随便找几张就行）

主方法类：

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private RadioGroup radio;
    private Button btn;
    private List<Integer> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager = findViewById(R.id.viewPager);
        radio = findViewById(R.id.radio);
        btn = findViewById(R.id.btn);
        list = new ArrayList<Integer>();
        list.add(R.drawable.a);
        list.add(R.drawable.b);
        list.add(R.drawable.c);
        MyAdapter adapter = new MyAdapter(list,MainActivity.this);
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }
            @Override
            public void onPageSelected(int position) {
                switch (position){
                    case 0:
                        radio.check(R.id.btn_01);
                        btn.setVisibility(View.GONE);//按钮隐藏
                        break;
                    case 1:
                        radio.check(R.id.btn_02);
                        btn.setVisibility(View.GONE);//按钮隐藏
                        break;
                    case 2:
                        radio.check(R.id.btn_03);
                        btn.setVisibility(View.VISIBLE);//隐藏按钮显示
                        break;
                    default:
                        break;
                }
            }
            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);
            }
        });
    }
}

activity_main  布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true" />
    <RadioGroup
        android:id="@+id/radio"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <RadioButton
            android:id="@+id/btn_01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"/>
        <RadioButton
            android:id="@+id/btn_02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/btn_03"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </RadioGroup>
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:visibility="gone"
        android:layout_above="@id/radio"
        android:text="点击" />
</RelativeLayout>

MyAdapter  适配器类：

//轮播适配器
public class MyAdapter extends PagerAdapter {
    private List<Integer> list;
    private Context context;
    public MyAdapter(List<Integer> list, Context context) {
        this.list = list;
        this.context = context;
    }
    @Override
    public int getCount() {
        return list.size();
    }
    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imageView = new ImageView(context);
        imageView.setImageResource(list.get(position));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        container.addView(imageView);
        return imageView;
    }
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }
}

Main2Activity  跳转页面类                                                          

清单文件的<application>里记得加上<activity android:name=".Main2Activity"/>          

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
    }
}

activity_main2

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="这里是新的页面" />
    
</RelativeLayout>