ViewPager（视图滑动切换工具）

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example2.viewpager.MainActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

    <android.support.v4.view.ViewPager

        android:id="@+id/viewpage1"

        android:layout_height="wrap_content"

        android:layout_width="wrap_content" />

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:id="@+id/layout_id1"

    android:background="@color/colorAccent"

    tools:context="com.example2.viewpager.MainActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="layout111111"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:id="@+id/layout_id2"

    android:background="@color/colorPrimary"

    tools:context="com.example2.viewpager.MainActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="layout22222222"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

package com.example2.viewpager;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ArrayList<View> listView;

    View view1,view2, view3;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        LayoutInflater LI = LayoutInflater.from(this);

        view1 = LI.inflate(R.layout.layout1, null);

        view2 = LI.inflate(R.layout.layout2, null);

        view3 = LI.inflate(R.layout.layout3, null);

        listView = new ArrayList<View>();

        listView.add(view1);

        listView.add(view2);

        listView.add(view3);

        PagerAdapter pageradapter = new PagerAdapter() {

            @Override

            public int getCount() {

                return listView.size();

            }

            @Override

            public boolean isViewFromObject(View view, Object object) {

                return view == object;

            }

            public Object instantiateItem(ViewGroup container, int position){

                container.addView(listView.get(position));

                return listView.get(position);

            }

        };

        Log.e("hj...", "4444444");

        ViewPager viewPager = (ViewPager)findViewById(R.id.viewpage1);

        viewPager.setAdapter(pageradapter);

    }

}