本文实例为大家分享了Android实现ViewPager无限循环效果的第二种方式，供大家参考，具体内容如下

原理：在Adapter中将getCount设置为无限大

package com.xiaomai.myproject.demo;

import android.os.Bundle;

import android.support.v4.view.ViewPager;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.LinearLayout;

import com.xiaomai.myproject.R;

import com.xiaomai.myproject.adapter.LoopViewPagerAdapter2;

import com.xiaomai.myproject.base.BaseActivity;

import java.util.ArrayList;

import java.util.List;

/**

* Created by XiaoMai on 2016/10/9 17:44.

*

*/

public class LoopViewPagerDemo2Activity extends BaseActivity {

/**

* 更新图片的时间

*/

private static final int UPDATE_TIME = 3 * 1000;

private ViewPager mViewPager;

private LoopViewPagerAdapter2 mAdapter;

/**

* 指示Point

*/

private LinearLayout mLinearLayoutPonits;

/**

* 图片资源集合

*/

private int[] mImageIds;

/**

* 图片集合

*/

private List mImageList;

/**

* 当前广告的index

*/

private int mCurrentPageIndex;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

}

@Override

protected void initVariables() {

super.initVariables();

/**

* 初始化图片的资源id

*/

mImageIds = new int[]{

R.mipmap.ic_launcher,

R.mipmap.ic_launcher,

R.mipmap.ic_launcher,

R.mipmap.ic_launcher,

R.drawable.my_toast,

R.drawable.my_toast,

R.drawable.my_toast,

R.drawable.my_toast};

/**

* 添加ImageView

*/

mImageList = new ArrayList<>();

//额外添加两张图片

ViewGroup.LayoutParams layoutParams =

new ViewGroup.LayoutParams(

ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.WRAP_CONTENT);

for (int i = 0; i < mImageIds.length; i++) {

ImageView imageView = new ImageView(mContext);

imageView.setLayoutParams(layoutParams);

mImageList.add(imageView);

}

}

@Override

protected void initViews() {

mLinearLayoutPonits = (LinearLayout) findViewById(R.id.activity_ll_container);

mViewPager = (ViewPager) findViewById(R.id.activity_loop_viewpager);

mAdapter = new LoopViewPagerAdapter2(mImageList, mImageIds);

mViewPager.setAdapter(mAdapter);

int middle = mAdapter.getCount() / 2;

mViewPager.setCurrentItem(middle - middle % mImageList.size());

}

@Override

protected int getContentLayout() {

return R.layout.act_loopviewpager;

}

}

代码：

package com.xiaomai.myproject.adapter;

import android.support.v4.view.PagerAdapter;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import java.util.List;

/**

* Created by XiaoMai on 2016/10/9 17:53.

*/

public class LoopViewPagerAdapter2 extends PagerAdapter {

private List mImageList;

private int[] mImageIds;

public LoopViewPagerAdapter2(List mImageList, int[] mImageIds) {

this.mImageList = mImageList;

this.mImageIds = mImageIds;

}

@Override

public int getCount() {

return Integer.MAX_VALUE;

}

@Override

public boolean isViewFromObject(View view, Object object) {

return view == object;

}

@Override

public Object instantiateItem(ViewGroup container, int position) {

ImageView imageView = mImageList.get(position % mImageList.size());

imageView.setImageResource(mImageIds[position % mImageIds.length]);

container.addView(imageView);

return mImageList.get(position % mImageList.size());

}

@Override

public void destroyItem(ViewGroup container, int position, Object object) {

container.removeView(mImageList.get(position % mImageList.size()));

}

}

act_loopviewpager.xml

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

android:id="@+id/titleBar"

layout="@layout/my_app_bar" />

android:id="@+id/activity_loop_viewpager"

android:layout_width="match_parent"

android:layout_height="200dp"

android:layout_below="@id/titleBar" />

android:id="@+id/activity_ll_container"

android:layout_width="match_parent"

android:orientation="horizontal"

android:gravity="center"

android:background="@color/toast"

android:layout_alignBottom="@id/activity_loop_viewpager"

android:visibility="gone"

android:layout_height="40dp"/>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。