android - Retrieve and parse JSON from multiple URLs and add to listview -
i started learning android week ago , decided write simple android application website bhooka.in. used koush/ion api retrieve json data url.
here's problem - have single json file, containing multiple json urls. tried retrieve jsons in loop, doesn't seem work. here's code:
future<jsonobject> loading; private void load() { // don't attempt load more if load in progress if (loading != null && !loading.isdone() && !loading.iscancelled()) return; // load tweets string url = "http://bhooka.in/web_services_json_helper.php?mode=fetch_locations&user_agent=in.bhooka.bhooka&city_id=4"; loading = ion.with(this) .load(url) .asjsonobject() .setcallback(new futurecallback<jsonobject>() { @override public void oncompleted(exception e, jsonobject result) { // called onto ui thread, no activity.runonuithread or handler.post necessary. if (e != null) { toast.maketext(getview().getcontext(), "error loading information", toast.length_long).show(); return; } jsonarray locationslist = result.getasjsonarray("locations"); // add tweets (int = 0; < locationslist.size(); i++) { try { jsonobject temp = ion.with(getview().getcontext()) .load("http://bhooka.in/web_services_json_helper.php?mode=fetch_loc_info&user_agent=in.bhooka.bhooka&loc_id=" + locationslist.get(i).getasjsonobject().get("post_id").getasstring()) .asjsonobject().get(); placearrayadapter.add(temp.get("loc_info").getasjsonobject()); } catch (exception ex) { ex.printstacktrace(); } /* tried approach - doesn't work .setcallback(new futurecallback<jsonobject>() { @override public void oncompleted(exception e, jsonobject result) { // called onto ui thread, no activity.runonuithread or handler.post necessary. if (e != null) { toast.maketext(getview().getcontext(), "error loading information", toast.length_long).show(); return; } placearrayadapter.add(result.get("loc_info").getasjsonobject()); } });*/ } } }); } the application opens , freezes. i've tried asynchronous approach using callbacks, shows 1 or 2 entries in listview , crashes. please tell me i'm doing wrong?
thanks lot.
edit: suggested, here's logcat:
07-14 17:02:11.851 20332-20332/? d/dalvikvm﹕ late-enabling checkjni 07-14 17:02:11.867 20332-20338/? d/dalvikvm﹕ debugger has detached; object registry had 1 entries 07-14 17:02:12.206 20332-20332/? i/adreno-egl﹕ <qegldrvapi_eglinitialize:410>: egl 1.4 qualcomm build: au_linux_android_lnx.la.3.5.1_rb1.04.04.02.048.018_msm8610_lnx.la.3.5.1_rb1__release_au () opengl es shader compiler version: e031.24.00.08 build date: 03/07/14 fri local branch: remote branch: quic/lnx.la.3.5.1_rb1.1 local patches: none reconstruct branch: au_linux_android_lnx.la.3.5.1_rb1.04.04.02.048.018 + f2fd134 + nothing 07-14 17:02:12.244 20332-20332/? d/openglrenderer﹕ enabling debug mode 0 07-14 17:02:14.469 20332-20364/in.bhooka.bhooka d/dalvikvm﹕ trying load lib /data/app-lib/in.bhooka.bhooka-2/libgmscore.so 0x41d995f0 07-14 17:02:14.470 20332-20364/in.bhooka.bhooka e/dalvikvm﹕ dlopen("/data/app-lib/in.bhooka.bhooka-2/libgmscore.so") failed: dlopen failed: library "/data/app-lib/in.bhooka.bhooka-2/libgmscore.so" not found 07-14 17:02:14.470 20332-20364/in.bhooka.bhooka e/providerinstaller﹕ unable load native code /data/app-lib/in.bhooka.bhooka-2/libgmscore.so 07-14 17:02:14.470 20332-20364/in.bhooka.bhooka d/dalvikvm﹕ trying load lib /data/app-lib/com.google.android.gms-2/libgmscore.so 0x41d995f0 07-14 17:02:14.472 20332-20364/in.bhooka.bhooka d/dalvikvm﹕ added shared lib /data/app-lib/com.google.android.gms-2/libgmscore.so 0x41d995f0 07-14 17:02:14.472 20332-20364/in.bhooka.bhooka d/dalvikvm﹕ no jni_onload found in /data/app-lib/com.google.android.gms-2/libgmscore.so 0x41d995f0, skipping init 07-14 17:02:14.474 20332-20364/in.bhooka.bhooka e/providerinstaller﹕ libgmscore version mismatch (0 vs. 7574) 07-14 17:02:14.474 20332-20364/in.bhooka.bhooka w/ionconscrypt﹕ conscrypt initialization failed. 07-14 17:02:44.955 20332-20364/in.bhooka.bhooka d/dalvikvm﹕ gc_for_alloc freed 3066k, 29% free 7930k/11072k, paused 37ms, total 47ms 07-14 17:02:45.008 20332-20332/in.bhooka.bhooka d/androidruntime﹕ shutting down vm 07-14 17:02:45.008 20332-20332/in.bhooka.bhooka w/dalvikvm﹕ threadid=1: thread exiting uncaught exception (group=0x415dad40) 07-14 17:02:45.010 20332-20332/in.bhooka.bhooka e/androidruntime﹕ fatal exception: main process: in.bhooka.bhooka, pid: 20332 java.lang.nullpointerexception @ in.bhooka.bhooka.mainactivity$1.oncompleted(mainactivity.java:73) @ in.bhooka.bhooka.mainactivity$1.oncompleted(mainactivity.java:67) @ com.koushikdutta.async.future.simplefuture.handlecallbackunlocked(simplefuture.java:107) @ com.koushikdutta.async.future.simplefuture.setcomplete(simplefuture.java:141) @ com.koushikdutta.async.future.simplefuture.setcomplete(simplefuture.java:124) @ com.koushikdutta.ion.ionrequestbuilder$1.run(ionrequestbuilder.java:244) @ com.koushikdutta.async.asyncserver$runnablewrapper.run(asyncserver.java:57) @ android.os.handler.handlecallback(handler.java:733) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:136) @ android.app.activitythread.main(activitythread.java:5086) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:515) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:601) @ dalvik.system.nativestart.main(native method)
instead use retrofit , jackson converter locations . code since code complex. these best combination deal urls
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