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