Android实现ViewPager无限循环效果（二）

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<ImageView> 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<ImageView> mImageList;
private int[] mImageIds;
public LoopViewPagerAdapter2(List<ImageView> 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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/titleBar"
layout="@layout/my_app_bar" />
<android.support.v4.view.ViewPager
android:id="@+id/activity_loop_viewpager"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_below="@id/titleBar" />
<LinearLayout
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"/>
</RelativeLayout>

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。

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