动态添加ViewPager无限循环滑动

package com.cogent.viewpager; import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.view.Window; import android.widget.ImageView; import android.widget.TextView; /** * 无限滑动，实现动态添加,动态添加第一次加入后，的第一轮滑动，页数显示混乱···。 * */ public class ViewPagerGuideActivity extends Activity { private ViewPager viewPager; private ArrayList<View> pageViews; private ImageView imageView; private ImageView[] imageViews; // 鍖呰９婊戝姩鍥剧墖鐨凩inearLayout private ViewGroup viewPics; // 鍖呰９灏忓渾鐐圭殑LinearLayout private ViewGroup viewPoints; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); LayoutInflater inflater = getLayoutInflater(); pageViews = new ArrayList<View>(); pageViews.add(inflater.inflate(R.layout.page01, null)); pageViews.add(inflater.inflate(R.layout.page02, null)); pageViews.add(inflater.inflate(R.layout.page03, null)); imageViews = new ImageView[pageViews.size()]; viewPics = (ViewGroup) inflater.inflate(R.layout.view_pics, null); viewPoints = (ViewGroup) viewPics.findViewById(R.id.viewGroup); viewPager = (ViewPager) viewPics.findViewById(R.id.guidePages); for (int i = 0; i < pageViews.size(); i++) { imageView = new ImageView(ViewPagerGuideActivity.this); imageView.setLayoutParams(new LayoutParams(20, 20)); imageView.setPadding(20, 0, 20, 0); imageViews[i] = imageView; if (i == 0) { imageViews[i] .setBackgroundResource(R.drawable.page_indicator_focused); } else { imageViews[i].setBackgroundResource(R.drawable.page_indicator); } viewPoints.addView(imageViews[i]); } setContentView(viewPics); viewPager.setAdapter(new GuidePageAdapter()); viewPager.setOnPageChangeListener(new GuidePageChangeListener()); viewPager.setCurrentItem(Integer.MAX_VALUE/2) ; } private int count ; public void addView(View view){ TextView text = new TextView(this) ; text.setText(""+count++) ; pageViews.add(text) ; } class GuidePageAdapter extends PagerAdapter { private ArrayList<Integer> countArray = new ArrayList<Integer>() ; private int old_c_p = -1 ; @Override public void destroyItem(View v, int position, Object arg2) { System.out.println("destroyItem:" + position ); if(instantiate_cut_p==position%pageViews.size()){ System.out.println("刚生成的界面，避免删除 instantiate_cut_p = "+instantiate_cut_p+" 返回。") ; return ; } System.out.println("成功删除："+" remove("+position%pageViews.size()+")" ); ((ViewPager) v).removeView(pageViews.get(position%pageViews.size())); countArray.remove(Integer.valueOf(position%pageViews.size())) ; } @Override public void finishUpdate(View arg0) { } @Override public int getCount() { return Integer.MAX_VALUE; } private int oldP = -1; private int instantiate_cut_p = -1 ; @Override public Object instantiateItem(View v, int position) { System.out .println("instantiateItem:" + position ); if(countArray.contains(position% pageViews.size())){ System.out.println("还含有这个View，予以删除 删除Integer = "+position% pageViews.size()); ((ViewPager) v).removeView(pageViews.get(position % pageViews.size())) ; instantiate_cut_p = position%pageViews.size() ; }else{ System.out.println("还没有这个View,添加 add("+position % pageViews.size()+")") ; countArray.add(position % pageViews.size()) ; } System.out.println("添加成功 "+position) ; ((ViewPager) v).addView(pageViews.get(position % pageViews.size())); return pageViews.get(position % pageViews.size()); } @Override public boolean isViewFromObject(View v, Object arg1) { return v == arg1; } @Override public void startUpdate(View arg0) { } @Override public int getItemPosition(Object object) { return super.getItemPosition(object); } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } } class GuidePageChangeListener implements OnPageChangeListener { @Override public void onPageScrollStateChanged(int arg0) { } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int position) { for (int i = 0; i < imageViews.length; i++) { imageViews[position%imageViews.length] .setBackgroundResource(R.drawable.page_indicator_focused); if (position != i) { imageViews[i] .setBackgroundResource(R.drawable.page_indicator); } } } } }