android - viewPager實現左右滑動

一、activity

public class ViewPager2 extends Activity {

    private ViewPager pager;
    private List<View> list;

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

    //初始化ViewPager的方法
    public void initViewPager() {
        ImageView iv1 = new ImageView(this);
        iv1.setImageResource(R.mipmap.image_1);
        ImageView iv2 = new ImageView(this);
        iv2.setImageResource(R.mipmap.image_2);
        ImageView iv3 = new ImageView(this);
        iv3.setImageResource(R.mipmap.image_3);
        list = new ArrayList<View>();
        list.add(iv1);
        list.add(iv2);
        list.add(iv3);

        pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(new ViewPagerAdapter(list));
        //監聽ViewPager滑動效果
        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageSelected(int arg0) {

            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }
        });
    }

二、xml佈局

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

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

三、viewpager工具類

public class ViewPagerAdapter extends PagerAdapter {

    private List<View> listView;

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(listView.get(position));
        return listView.get(position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(listView.get(position));
    }

    public ViewPagerAdapter(List<View> listView){super();
        this.listView=listView;
    }

    @Override
    public int getCount() {
        return listView.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }
}