? 1）ViewPager類直接繼承了ViewGroup類，所有它是一個容器類，可以在其中添加其他的view類。

? 2）ViewPager類需要一個PagerAdapter適配器類給它提供數據。

向右滑動切換圖片

MainActivity package com.shaoxin.myviewpager;import android.os.Bundle; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; 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 {private ViewPager viewpager;private List<ImageView> imageViewList;private int[] imgId = {R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);viewpager = (ViewPager) findViewById(R.id.viewpager);imageViewList = new ArrayList<>();for (int i = 0; i < imgId.length; i++) {ImageView imgview = new ImageView(this);imgview.setBackgroundResource(imgId[i]);imageViewList.add(imgview);}MyAdapter adapter = new MyAdapter();viewpager.setAdapter(adapter);}private class MyAdapter extends PagerAdapter {@Overridepublic int getCount() {return imageViewList.size();}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {container.addView(imageViewList.get(position));return imageViewList.get(position);}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView(imageViewList.get(position));}} }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/activity_main"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.shaoxin.myviewpager.MainActivity"><android.support.v4.view.ViewPagerandroid:id="@+id/viewpager"android:layout_width="match_parent"android:layout_height="match_parent" /> </RelativeLayout>

?

轉載于:https://www.cnblogs.com/ShaoXin/p/6171452.html

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