Android ViewPager + Fragment实现滑动页面

效果：

PagerData类：

package com.cloud.viewpagerdemo;

import java.io.Serializable;

class PagerData implements Serializable {

    private int mImageResId;
    private String mContent;

    PagerData(int imageResId, String content) {
        mImageResId = imageResId;
        mContent = content;
    }

    public int getImageResId() {
        return mImageResId;
    }

    public void setImageResId(int imageResId) {
        mImageResId = imageResId;
    }

    public String getContent() {
        return mContent;
    }

    public void setContent(String content) {
        mContent = content;
    }
}

PagerFragment类：

package com.cloud.viewpagerdemo;

import android.graphics.Outline;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewOutlineProvider;
import android.widget.ImageView;
import android.widget.TextView;

public class PagerFragment extends Fragment {

    private static final String ARG_DATA = "data";

    private PagerData mData;

    private ImageView mImageView;
    private TextView mContent;

    /**
     * 通过静态方法获取Fragment实例，向Fragment传参数
     * @param data 数据
     * @return Fragment
     */
    public static PagerFragment newInstance(PagerData data) {
        PagerFragment fragment = new PagerFragment();

        //使用FragmentArguments传递参数
        Bundle args = new Bundle();
        args.putSerializable(ARG_DATA, data);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mData = (PagerData) getArguments().getSerializable(ARG_DATA);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_pager, container, false);

        //绑定控件
        mImageView = view.findViewById(R.id.image_view);
        mContent = view.findViewById(R.id.text_content);

        //ImageView设置圆角
        ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setRoundRect(0, 0, mImageView.getWidth(), mImageView.getHeight(), 16);
            }
        };

        mImageView.setOutlineProvider(viewOutlineProvider);
        mImageView.setClipToOutline(true);
        mImageView.setImageResource(mData.getImageResId());
        mContent.setText(mData.getContent());

        return view;
    }
}

PagerActivity:

package com.cloud.viewpagerdemo;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class PagerActivity extends AppCompatActivity {

    private List<PagerData> mPagerData = new ArrayList<>();

    private ViewPager mViewPager;
    private TextView mTextPage;

    private String page = "1 / 3";

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

        initData();

        FragmentManager fragmentManager = getSupportFragmentManager();

        mViewPager = findViewById(R.id.view_pager);
        mTextPage = findViewById(R.id.text_page);
        //设置ViewPager适配器
        mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
            @Override
            public Fragment getItem(int position) {
                return PagerFragment.newInstance(mPagerData.get(position));
            }

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

        //监听页面改变
        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                //页面选中
                page = String.valueOf(position + 1) + " / " + String.valueOf(mPagerData.size());
                mTextPage.setText(page);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
        //设置缓存页数
        mViewPager.setOffscreenPageLimit(3);
        //设置默认页
        mViewPager.setCurrentItem(0);

        mTextPage.setText(page);
    }

    private void initData() {
        //添加三项数据
        mPagerData.add(new PagerData(R.drawable.img_0, "Photo by Adam Krowitz"));
        mPagerData.add(new PagerData(R.drawable.img_1, "Photo by Samuel Ferrara"));
        mPagerData.add(new PagerData(R.drawable.img_2, "Photo by Earth"));
    }
}

fragment_pager：

<?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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:background="@drawable/pager_background"
        android:elevation="4dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:id="@+id/image_view"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_margin="8dp"
            android:layout_weight="1"
            android:contentDescription="@null"
            android:scaleType="centerCrop" />

        <TextView
            android:id="@+id/text_content"
            android:layout_width="match_parent"
            android:layout_height="125dp"
            android:gravity="center"
            android:padding="8dp"
            android:textSize="18sp"
            android:textColor="#000000"
            tools:text="Content" />

    </LinearLayout>

</android.support.constraint.ConstraintLayout>

activity_pager：

<?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=".PagerActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="@color/colorPrimary"
        android:elevation="4dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:textSize="18sp"
            android:textColor="#FFFFFF"
            android:text="@string/app_name" />

    </android.support.v7.widget.Toolbar>

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar">

    </android.support.v4.view.ViewPager>

    <TextView
        android:id="@+id/text_page"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/toolbar"
        tools:text="page" />

</android.support.constraint.ConstraintLayout>