摘自：安卓APP_ 布局（7) —— ViewPager翻页
作者：丶PURSUING
发布时间： 2021-04-14 19:37:18
网址：https://blog.csdn.net/weixin_44742824/article/details/115705471

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#00ffff"android:orientation="vertical"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="layout1"android:textSize="50sp"/></LinearLayout>
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activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#00ffff"android:orientation="vertical"><androidx.viewpager.widget.ViewPagerandroid:layout_width="match_parent"android:layout_height="match_parent"android:id="@+id/vp"/></LinearLayout>
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MainActivity.java

public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//通过Inflater进行渲染LayoutInflater lf = getLayoutInflater().from(this);//使用lf对象进行渲染View view1 = lf.inflate(R.layout.mylayout1, null);View view2 = lf.inflate(R.layout.mylayout2, null);View view3 = lf.inflate(R.layout.mylayout3, null);//把三个view添加到集合中List<View> viewList = new ArrayList<>();viewList.add(view1);viewList.add(view2);viewList.add(view3);ViewPager viewPage = findViewById(R.id.vp);//有了集合后，创建AdapterMyAdapter myAdapter = new MyAdapter(viewList);viewPage.setAdapter(myAdapter);}
}
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MyAdapter.java

public class MyAdapter extends PagerAdapter {//创建View列表private List<View> mListView;public MyAdapter(List<View> mListView){this.mListView = mListView;}@NonNull@Override//方法实现了：（1）将给定位置的view添加到ViewGroup（容器）中，创建并显示出来//         （2）返回一个代表新增页面的Object(key)，通常都是直接返回view本身就可以public Object instantiateItem(@NonNull ViewGroup container, int position) {container.addView(mListView.get(position),0);return mListView.get(position);}@Override//获得viewpager中有多少个viewpublic int getCount() {return mListView.size();}@Override//判断instantiateItem方法返回来的key与一个页面视图是否代表同一个视图（即他们是否相对应，对应则表示同一个view）//通常是直接写return view == objectpublic boolean isViewFromObject(@NonNull View view, @NonNull Object object) {return view == object;}@Override//移除一个给定位置的页面public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {container.removeView(mListView.get(position));}
}
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