Lazy Loading of Fragment+viewpager

The company app uses Viewpager to load fragment: Each Viewpager page is a fragment,fragment content from the Web, and the function to be implemented is when switching between different pages of Viewpager, can display the page that has been loaded smoothly.

The implementation of the method is very simple answer. Because Viewpager has the ability to cache.

Mviewpager.setoffscreenpagelimit (6);

You can do this by simply adding this sentence: for fragment that have already been loaded, any event of that fragment will not be triggered when it is switched. It can be displayed normally when switching back.

It is important to note that the function of this sentence is to set the number of pre-cached fragment (or other view). If the set number is too large, the fragment that is not displayed when you load the current fragment will cause the current page to load too slowly. So this number should choose the appropriate value.

More Content Blog Links: http://blog.csdn.net/zhouzme/article/details/19707677

2. Package com.cosmosource.mbi.fragment;
4. Import java.util.ArrayList;
6. Import java.util.List;
8. Import Cn.jiabeis.andr.log.CommonLog;
10. Import Cn.jiabeis.andr.log.LogFactory;
12. Import com.cosmosource.mbi.MainActivity;
14. Import COM.COSMOSOURCE.MBI.R;
16. Import Com.cosmosource.mbi.adapter.TabPagerAdapter;
18. Import Com.jeremyfeinstein.slidingmenu.lib.SlidingMenu;
20. Import Android.os.Bundle;
22. Import Android.os.Handler;
24. Import android.support.v4.app.Fragment;
26. Import Android.support.v4.view.PagerAdapter;
28. Import Android.support.v4.view.ViewPager;
30. Import Android.support.v4.view.ViewPager.OnPageChangeListener;
32. Import Android.view.LayoutInflater;
34. Import Android.view.View;
36. Import Android.view.ViewGroup;
38. Import android.view.ViewParent;
40. /**
42. * @description Viewerpager's Fragment
44. * @author Herb
46. * @version 0.1
48. * @since 2013-11-18 10:29:37
50. */
52. public class Viewpagerfragment extends commonfragment{
56. Private static final Commonlog log = Logfactory.createlog ();
58. /**
60. * References to Viewpager objects
62. */
64. Public Viewpager Mviewpager;
66. /**
68. * Loading fragment containers, each of our interfaces is a fragment
70. */
72. Private list<fragment> mfragmentlist = new arraylist<fragment> ();
74. /**
76. * Used to record fragment that have been browsed, no longer loading from the Web, because the Viewpager cache function when switching fragemnt
78. * Does not trigger any events for fragment. Can be saved in full.
80. * JKX
82. */
84. Private list<fragment> browsedfragmentlist = new arraylist<fragment> ();
86. Private Tabpageradapter TPA = null;
92. Public list<fragment> getmfragmentlist () {
94. return mfragmentlist;
96. }
100. public void Setmfragmentlist (list<fragment> mfragmentlist) {
102. This.mfragmentlist = mfragmentlist;
104. }
108. @Override
110. public void OnCreate (Bundle savedinstancestate) {
112. Super.oncreate (savedinstancestate);
114. }
116. @Override
118. Public View Oncreateview (layoutinflater inflater, ViewGroup container,
120. Bundle savedinstancestate) {
122. if (mview==null) {
128. MView = inflater.inflate (r.layout.frame_viewpager_layout, NULL);
130. Mviewpager = (Viewpager) Mview.findviewbyid (R.id.viewpager);
134. Setting up Monitoring
136. Mviewpager.setonpagechangelistener (New Mysetonpagechangelistener ());
138. Cache multiple sub-pages, pre-cache 16 menu items
140. Mviewpager.setoffscreenpagelimit (15);
142. /* Resolution: Java.lang.IllegalStateException:Recursive entry to executependingtransaction*/
144. New Handler (). postdelayed (New Runnable () {
146. @Override
148. public void Run () {
150. TPA = new Tabpageradapter (Getfragmentmanager (), mfragmentlist);
152. Mviewpager.setadapter (TPA);
154. Mviewpager.setcurrentitem (0);
156. /* Load url*/here
158. if (null! = Mfragmentlist && mfragmentlist.size () > 0) {
160. There are multiple secondary navigation, the default display of the No. 0 navigation corresponding to the fragment
162. Fragment ff = mfragmentlist.get (0);
164. if (null! = FF && ff instanceof webviewfragment) {
166. ((webviewfragment) FF). Cusloadurl ();
168. }
170. }
172. }
174. }, 10);
176. }else{
178. System.out.println ("Viewpagerfragment:mview is not empty, re-use");
180. }
182. return mView;
184. }
186. @Override
188. public void onactivitycreated (Bundle savedinstancestate) {
190. Super.onactivitycreated (savedinstancestate);
192. Setupviews ();
194. }
196. private void Setupviews () {
198. }
202. @Override
204. public void OnDestroy () {
206. Super.ondestroy ();
208. }
212. @Override
214. public void Ondestroyview () {
216. TODO auto-generated Method Stub
218. Super.ondestroyview ();
220. if (Null!=mview) {
222. ((ViewGroup) mview.getparent ()). Removeview (MView);
224. }
226. }
230. /**
232. * Viewpager page tab Toggle Listener
234. */
236. Class Mysetonpagechangelistener implements Onpagechangelistener
238. {
240. public void onpagescrollstatechanged (int arg0) {
244. }
246. public void onpagescrolled (int arg0, float arg1, int arg2) {
250. }
252. public void onpageselected (int position) {
254. Fragment ff = mfragmentlist.get (position);
256. /**
258. * determine if it has been browsed, and if not, reload it from the web.
260. * JKX
262. */
264. if (!isbrowsered (FF)) {
266. if (null! = FF && ff instanceof webviewfragment) {
268. ((webviewfragment) FF). Cusloadurl ();
270. }
272. Browsedfragmentlist.add (FF);
274. System.out.println ("Number of pages loaded:" +browsedfragmentlist.size ());
276. }
280. Mainactivity ma = (mainactivity) getactivity ();
282. if (null! = MA) {
284. Ma.getsupportactionbar (). Setselectednavigationitem (position);
288. int last = Mviewpager.getchildcount ()-1;
290. if (position = = Last | | position = = 0) {
292. Ma.getslidingmenu (). Settouchmodeabove (Slidingmenu.touchmode_margin);
294. } else {
296. Ma.getslidingmenu (). Settouchmodeabove (Slidingmenu.touchmode_none);
298. }
300. }
304. }
306. }
308. /**
310. * Determine if the fragment has been browsed.
312. * @param fragment
314. * @return
316. * JKX
318. */
320. public boolean isbrowsered (Fragment Fragment) {
322. if (Browsedfragmentlist.contains (fragment)) {
324. return true;
326. }else{
328. return false;
330. }
332. }
334. }

Lazy Loading of Fragment+viewpager