Android ViewPager真正的实现无限循环滚动
在存放View的集合中的第一个位置放入真正的最后一个View，而在最后一个放入第一个。具体请参照下图以及代码！
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package com.xinye.ui;
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import java.util.ArrayList;
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import java.util.HashMap;
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import net.tsz.afinal.FinalBitmap;
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import net.tsz.afinal.FinalHttp;
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import net.tsz.afinal.http.AjaxCallBack;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import android.graphics.Color;
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import android.support.v4.view.PagerAdapter;
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import android.support.v4.view.ViewPager;
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import android.support.v4.view.ViewPager.OnPageChangeListener;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import android.widget.ImageView.ScaleType;
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import android.widget.TextView;
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import android.widget.Toast;
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import com.xinye.R;
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import com.xinye.domain.Bargain;
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import com.xinye.domain.Screen;
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import com.xinye.domain.ViewFrame;
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import com.xinye.util.ApplicationUtils;
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import com.xinye.util.ConstantsUtils;
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import com.xinye.util.FileUtils;
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import com.xinye.util.ImagePathUtils;
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import com.xinye.util.LogUtils;
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import com.xinye.util.StringUtils;
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import com.xinye.view.SlidingView;
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/**
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* Fragment
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*
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*
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*
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*/
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public class BannerFragment extends BaseFragment implements OnPageChangeListener {
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// 当前Fragment的RootView
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private View mRootView = null;
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// 当前Fragment中的ViewPager
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private ViewPager mViewPager = null;
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// 展示当前页面标识的TextView
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private TextView mTextView = null;
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// 布局填充器对象
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private LayoutInflater mLayoutInflater = null;
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// 保存Bargain信息的ArrayList
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private ArrayList<Bargain> mBargainList = new ArrayList<Bargain>();
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// 保存所有的ViewPager的View
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private ArrayList<ImageView> mViewList = new ArrayList<ImageView>();
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// Bitmap载入工具类
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private FinalBitmap mFinalBitmap;
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// 切换到左边的ImageView
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private ImageView mToLeftImageView = null;
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// 切换到右侧的ImageView
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private ImageView mToRightImageView = null;
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// 图片URL列表
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private static ArrayList<String> mImageUrlList = new ArrayList<String>();
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@Override
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protected void initContent() {
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mFinalBitmap = FinalBitmap.create(mActivity, FileUtils.getCacheDirectory(mActivity));
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mTopbarTextView.setText(R.string.popup_banner);
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mPopupBannerTextView.setTextColor(Color.argb(0xff, 0xa1, 0x01, 0x01));
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mTopbarLeftImageView.setImageResource(R.drawable.topbar_banner);
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mLayoutInflater = mActivity.getLayoutInflater();
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mRootView = mLayoutInflater.inflate(R.layout.fragment_banner, null);
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mbaseLinearLayout.addView(mRootView);
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mViewPager = (ViewPager) mRootView.findViewById(R.id.bannerFragmentViewPager);
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mTextView = (TextView) mRootView.findViewById(R.id.countBannerFragmentTextView);
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mToLeftImageView = (ImageView) mRootView.findViewById(R.id.toLeftBannerFragmentImageView);
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mToLeftImageView.setOnClickListener(BannerFragment.this);
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mToRightImageView = (ImageView) mRootView.findViewById(R.id.toRightBannerFragmentImageView);
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mToRightImageView.setOnClickListener(BannerFragment.this);
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try {
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if(mImageUrlList != null && mImageUrlList.size() > 0){
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initViewPager();
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}else{
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initData();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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// 初始化数据
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private void initData() throws Exception {
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HashMap<String, Object> data = new HashMap<String, Object>();
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data.put("loginUserId", UserLoginActivity.userID);
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data.put("checkStr", UserLoginActivity.token);
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data.put("isMember", UserLoginActivity.isMember);
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String url = StringUtils.composeUrl(ConstantsUtils.BANNER_LIST_URL, data);
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LogUtils.printLog(Log.INFO, LogUtils.LOG_TAG, "BannerFragment initData url = " + url);
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new FinalHttp().get(url, new AjaxCallBack<String>() {
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@Override
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public void onSuccess(String t) {
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LogUtils.printLog(Log.INFO, LogUtils.LOG_TAG, "banner list JSON:" + t);
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parseJSON(t);
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super.onSuccess(t);
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}
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@Override
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public void onFailure(Throwable t, String strMsg) {
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if(t != null){
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mImageUrlList = FileUtils.readListFromFile(mActivity, FileUtils.LIST_BANNER_FILE_NAME);
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if(mImageUrlList != null){
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initViewPager();
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}
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}
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super.onFailure(t, strMsg);
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}
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});
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}
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// 解析JSON
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private void parseJSON(String t) {
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if (t == null) {
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return;
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}
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try {
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JSONObject tObj = new JSONObject(t);
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int status = tObj.getInt("status");
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// String message = tObj.getString("message");
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if (status == 0) {
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String dataString = tObj.getString("data");
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if (dataString != null && !dataString.equalsIgnoreCase("null")) {
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JSONObject dataObj = new JSONObject(dataString);
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String partnerBargainFormListString = dataObj.getString("partnerBargainFormList");
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if (partnerBargainFormListString != null && !partnerBargainFormListString.equalsIgnoreCase("null")) {
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JSONArray array = new JSONArray(partnerBargainFormListString);
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Screen screen = ApplicationUtils.getScreen(mActivity);
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if (array != null) {
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int len = array.length();
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for (int i = 0; i < len; i++) {
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JSONObject obj = array.getJSONObject(i);
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String bargainString = obj.getString("partnerBargain");
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Bargain bargain = new Bargain();
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if (bargainString != null && !bargainString.equalsIgnoreCase("null")) {
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JSONObject bargainObj = new JSONObject(bargainString);
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bargain.partnerCategoryId = bargainObj.getLong("partnerCategoryId");
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bargain.partnerId = bargainObj.getLong("partnerId");
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bargain.pictureId = bargainObj.getLong("pictureId");
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bargain.title = bargainObj.getString("title");
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bargain.displayOrder = bargainObj.getLong("displayOrder");
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bargain.dailySpecialsId = bargainObj.getLong("dailySpecialsId");
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bargain.bargainId = bargainObj.getLong("bargainId");
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}
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String pic = obj.getString("pic");
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pic = ImagePathUtils.getBannerRealPath(pic,screen);
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bargain.pic = pic;
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mBargainList.add(bargain);
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mImageUrlList.add(bargain.pic);
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}
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FileUtils.writeListToFile(mActivity, FileUtils.LIST_BANNER_FILE_NAME, mImageUrlList);
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initViewPager();
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}
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} else {
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return;
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}
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} else {
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return;
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}
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}
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} catch (JSONException e) {
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e.printStackTrace();
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}
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}
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// 初始化ViewPager
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private void initViewPager() {
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if(!(mImageUrlList != null && mImageUrlList.size() > 0)){
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return;
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}
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int length = mImageUrlList.size() + 2;
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for (int i = 0; i < length; i++) {
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ImageView mViewPagerImageView = new ImageView(mActivity);
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ViewGroup.LayoutParams viewPagerImageViewParams =
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new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
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ViewGroup.LayoutParams.FILL_PARENT);
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mViewPagerImageView.setLayoutParams(viewPagerImageViewParams);
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mViewPagerImageView.setScaleType(ScaleType.FIT_XY);
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mViewPagerImageView.setOnClickListener(BannerFragment.this);
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mViewList.add(mViewPagerImageView);
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}
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if (mViewList != null && mViewList.size() > 0) {
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mViewPager.setAdapter(new ViewpagerAdapter());
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}
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mViewPager.setOnPageChangeListener(BannerFragment.this);
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if (mImageUrlList.size() == 0) {
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mTextView.setText(String.format("0 / %s", mImageUrlList.size()));
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} else {
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mTextView.setText(String.format("1 / %s", mImageUrlList.size()));
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}
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mViewPager.setCurrentItem(1);
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if (mActivity.getSlidingMenu() != null && mActivity.getSlidingMenu().getSlidingView() != null) {
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SlidingView sv = mActivity.getSlidingMenu().getSlidingView();
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sv.setOnInterceptListener(new SlidingView.OnInterceptListener() {
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@Override
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public ViewFrame getInterceptViewFrame() {
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ViewFrame frame = new ViewFrame(0, 50, mViewPager.getWidth(), mViewPager.getHeight());
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return frame;
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}
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});
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}
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}
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@Override
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protected void init() {
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}
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/**
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* PagerAdapter
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* @author
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*
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*/
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class ViewpagerAdapter extends PagerAdapter {
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@Override
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public void destroyItem(View container, int position, Object object) {
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ImageView view = mViewList.get(position % mViewList.size());
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((ViewPager) container).removeView(view);
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view.setImageBitmap(null);
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}
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@Override
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public Object instantiateItem(View container, int position) {
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((ViewPager) container).addView(mViewList.get(position));
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return mViewList.get(position);
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}
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@Override
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public int getCount() {
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return mViewList.size();
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}
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@Override
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public boolean isViewFromObject(View view, Object object) {
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return view == object;
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}
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}
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@Override
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public void onPageScrollStateChanged(int state) {
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}
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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}
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@Override
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public void onPageSelected(int position) {
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if(position == 0){
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mFinalBitmap.display(mViewList.get(position), mImageUrlList.get(mImageUrlList.size() - 1));
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}else if(position == mViewList.size() - 1){
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mFinalBitmap.display(mViewList.get(position), mImageUrlList.get(0));
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}else{
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mFinalBitmap.display(mViewList.get(position), mImageUrlList.get(position - 1));
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}
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int pageIndex = position;
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if(position == 0){
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pageIndex = mImageUrlList.size();
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}else if(position == mImageUrlList.size() + 1){
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pageIndex = 1;
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}
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if(position != pageIndex){
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mViewPager.setCurrentItem(pageIndex, false);
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return;
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}
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int count = mViewList.size() - 2;
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if(mViewList != null && count > 0){
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int index = (position);
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String text = index + "/" + count;
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mTextView.setText(text);
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}else{
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String text = 0 + " / " + 0;
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mTextView.setText(text);
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}
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}
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@Override
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public void onClick(View v) {
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switch (v.getId()) {
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// 切换到左边的ImageView
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case R.id.toLeftBannerFragmentImageView: {
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if (mViewPager != null && mViewPager.getCurrentItem() > 0) {
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mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1, true);
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} else {
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Toast.makeText(mActivity, R.string.banner_is_first, Toast.LENGTH_SHORT).show();
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}
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}
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break;
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// 切换到右边的ImageView
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case R.id.toRightBannerFragmentImageView: {
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if (mViewPager != null && mViewList != null && mViewPager.getCurrentItem() < Integer.MAX_VALUE - 1) {
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mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1, true);
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} else {
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Toast.makeText(mActivity, R.string.banner_is_last, Toast.LENGTH_SHORT).show();
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}
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}
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break;
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}
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super.onClick(v);
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}
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@Override
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public void onPause() {
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if (mFinalBitmap != null) {
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mFinalBitmap.onPause();
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}
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super.onPause();
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}
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@Override
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public void onResume() {
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if (mFinalBitmap != null) {
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mFinalBitmap.onResume();
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}
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super.onResume();
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}
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@Override
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public void onDestroy() {
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if (mFinalBitmap != null) {
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mFinalBitmap.onDestroy();
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}
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super.onDestroy();
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}
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}