Android ViewPager实现图片滑动预览效果

效果图：

      滑动前：

       滑动后：

代码非常简单，实现起来很容易

xml代码：

<?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.example.blog_0615.MainActivity">

    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/vp_main_viewpager"
        ></android.support.v4.view.ViewPager>

</android.support.constraint.ConstraintLayout>

Activity代码：

package com.example.blog_0615;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

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

public class MainActivity extends AppCompatActivity {

    //定义图片数组
    private int images[]={R.drawable.bird,R.drawable.cat,R.drawable.chicken};
    //定义一个View的数组
    private List<View> views=new ArrayList<>();
    private ViewPager vp_main_viewpager;

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

        vp_main_viewpager = (ViewPager) findViewById(R.id.vp_main_viewpager);

        //将images数组中的图片放入ImageView
        for (int i = 0; i < images.length; i++) {
            ImageView imageView=new ImageView(this);
            imageView.setImageResource(images[i]);
            views.add(imageView);
        }

        //为ViewPager设置适配器
        vp_main_viewpager.setAdapter(new MyAdapter());
    }

    class MyAdapter extends PagerAdapter {

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

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View v=views.get(position);
            container.addView(v);

            return v;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            View v=views.get(position);
            //前一张图片划过后删除该View
            container.removeView(v);
        }


    }
}

以上代码就可以实现上述效果啦