android - Null Pointer in Adapters when Data Transmission INterupted -

android - Null Pointer in Adapters when Data Transmission INterupted -

i null forcefulness closes on android app when user interrupts transmission info feed. or if net slow , seems stall null

here how handle http code:

httpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost(url_select); seek { httppost.setentity(new urlencodedformentity(param)); httpresponse httpresponse = httpclient.execute(httppost); httpentity httpentity = httpresponse.getentity(); // read content = httpentity.getcontent(); } grab (exception e) { log.e("log_tag", "error in http connection " + e.tostring()); } seek { bufferedreader br = new bufferedreader( new inputstreamreader(is)); stringbuilder sb = new stringbuilder(); string line = ""; while ((line = br.readline()) != null) { sb.append(line + "\n"); } is.close(); result = sb.tostring(); } grab (exception e) { log.e("log_tag", "error converting result " + e.tostring()); } homecoming null; }

then in onpostexecute of asynctask, null returned here seen in logcat below:

adapter = new reviewadapter(getactivity(), r, tf); // line 1164

i assume r null kills it? (tf truetype font pass in)

here r code:

(string : reviews) { r[index] = new review(reviews.get(index), datelist.get(index), userlist.get(index), itemlist.get(index), ratings.get(index), helpfulcount.get(index), chatcounts.get(index), catlist.get(index), titlelist.get(index)); index++; }

these arraylists populated through json parsing php, etc.

so question is: how handle popularly? there away avoid null? or how can gracefully throw error rather forceclose?

here logcat:

02-19 12:15:12.012: e/androidruntime(32116): fatal exception: main 02-19 12:15:12.012: e/androidruntime(32116): java.lang.nullpointerexception 02-19 12:15:12.012: e/androidruntime(32116): @ android.widget.arrayadapter.init(arrayadapter.java:310) 02-19 12:15:12.012: e/androidruntime(32116): @ android.widget.arrayadapter.<init>(arrayadapter.java:128) 02-19 12:15:12.012: e/androidruntime(32116): @ com.---.---.reviewadapter.<init>(reviewadapter.java:42) 02-19 12:15:12.012: e/androidruntime(32116): @ com.---.---.ratefragmentactivity$reviewfragment$reviewtask.onpostexecute(ratefragmentactivity.java:1164) 02-19 12:15:12.012: e/androidruntime(32116): @ com.---.---.ratefragmentactivity$reviewfragment$reviewtask.onpostexecute(ratefragmentactivity.java:1) 02-19 12:15:12.012: e/androidruntime(32116): @ android.os.asynctask.finish(asynctask.java:631) 02-19 12:15:12.012: e/androidruntime(32116): @ android.os.asynctask.access$600(asynctask.java:177) 02-19 12:15:12.012: e/androidruntime(32116): @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:644) 02-19 12:15:12.012: e/androidruntime(32116): @ android.os.handler.dispatchmessage(handler.java:99) 02-19 12:15:12.012: e/androidruntime(32116): @ android.os.looper.loop(looper.java:137) 02-19 12:15:12.012: e/androidruntime(32116): @ android.app.activitythread.main(activitythread.java:5193) 02-19 12:15:12.012: e/androidruntime(32116): @ java.lang.reflect.method.invokenative(native method) 02-19 12:15:12.012: e/androidruntime(32116): @ java.lang.reflect.method.invoke(method.java:511) 02-19 12:15:12.012: e/androidruntime(32116): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:795) 02-19 12:15:12.012: e/androidruntime(32116): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:562) 02-19 12:15:12.012: e/androidruntime(32116): @ dalvik.system.nativestart.main(native method)

if first try block throws exception, should stop there , not bother sec try block since is potentially not value of httpentity.getcontent(); if httpclient.execute threw exception (which in case of poor connection.

why can't check if r null , nowadays error user stating connection lost?

android null nullpointerexception adapter