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POConverting arraylist to array
 

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  1. POConverting arraylist to array
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    <p>I have to convert arraylist to array for <a href="https://stackoverflow.com/questions/6631424/dynamic-lazylist/6631615#6631615">this</a> thread . Its sending null , so i am wondering about that there is something not right with conversion , although i have give a direct url but still its coming with empty value . The approach i have used is this </p> <pre><code>public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;String&gt; listItems = new ArrayList&lt;String&gt;(); try { URL twitter = new URL( "http://midsweden.gofreeserve.com/proj/androidjson.php?identifier=123"); URLConnection tc = twitter.openConnection(); BufferedReader in = new BufferedReader(new InputStreamReader( tc.getInputStream())); String line; while ((line = in.readLine()) != null) { JSONArray ja = new JSONArray(line); for (int i = 0; i &lt; ja.length(); i++) { JSONObject jo = (JSONObject) ja.get(i); listItems.add(jo.getString("http://midsweden.gofreeserve.com/proj/admin/pictures/file87619.JPG")); } } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } mStrings = listItems.toArray(new String[listItems.size()]); list=(ListView)findViewById(R.id.list); adapter=new LazyAdapter(this, mStrings); list.setAdapter(adapter); Button b=(Button)findViewById(R.id.button1); b.setOnClickListener(listener); } </code></pre> <p>Thanks .</p> <pre><code>Logcat 07-09 18:06:34.104: DEBUG/dalvikvm(55): GC freed 2 objects / 56 bytes in 403ms 07-09 18:06:34.594: DEBUG/dalvikvm(82): GC freed 7261 objects / 396352 bytes in 608ms 07-09 18:06:34.644: INFO/UsageStats(82): Unexpected resume of com.droidnova.android.howto.optionmenu while already resumed in com.htc.launcher 07-09 18:06:34.745: WARN/dalvikvm(82): disableGcForExternalAlloc: false 07-09 18:06:35.264: WARN/ActivityManager(82): Activity pause timeout for HistoryRecord{44b7d888 com.droidnova.android.howto.optionmenu/.Test} 07-09 18:06:35.274: DEBUG/ImagesWidgetProvider(15615): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:35.304: DEBUG/ImagesWidgetProvider(15615): onUpdate(): 07-09 18:06:35.794: INFO/global(15618): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required. 07-09 18:06:35.805: WARN/System.err(15618): org.json.JSONException: A JSONArray text must start with '[' at character 0 of 07-09 18:06:35.925: WARN/System.err(15618): at org.json.JSONTokener.syntaxError(JSONTokener.java:448) 07-09 18:06:35.935: WARN/System.err(15618): at org.json.JSONArray.&lt;init&gt;(JSONArray.java:104) 07-09 18:06:35.935: WARN/System.err(15618): at org.json.JSONArray.&lt;init&gt;(JSONArray.java:150) 07-09 18:06:35.935: WARN/System.err(15618): at com.droidnova.android.howto.optionmenu.Test.onCreate(Test.java:45) 07-09 18:06:35.944: WARN/System.err(15618): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 07-09 18:06:35.944: WARN/System.err(15618): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2544) 07-09 18:06:35.944: WARN/System.err(15618): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2621) 07-09 18:06:35.944: WARN/System.err(15618): at android.app.ActivityThread.access$2200(ActivityThread.java:126) 07-09 18:06:35.944: WARN/System.err(15618): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932) 07-09 18:06:35.954: WARN/System.err(15618): at android.os.Handler.dispatchMessage(Handler.java:99) 07-09 18:06:35.954: WARN/System.err(15618): at android.os.Looper.loop(Looper.java:123) 07-09 18:06:35.954: WARN/System.err(15618): at android.app.ActivityThread.main(ActivityThread.java:4595) 07-09 18:06:35.954: WARN/System.err(15618): at java.lang.reflect.Method.invokeNative(Native Method) 07-09 18:06:35.954: WARN/System.err(15618): at java.lang.reflect.Method.invoke(Method.java:521) 07-09 18:06:35.954: WARN/System.err(15618): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 07-09 18:06:35.954: WARN/System.err(15618): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 07-09 18:06:35.964: WARN/System.err(15618): at dalvik.system.NativeStart.main(Native Method) 07-09 18:06:35.964: DEBUG/ArrayList(15618): List: [] 07-09 18:06:37.164: INFO/ActivityManager(82): Start proc com.svox.pico for broadcast com.svox.pico/.VoiceDataInstallerReceiver: pid=15628 uid=10009 gids={} 07-09 18:06:37.594: INFO/dalvikvm(15628): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=38) 07-09 18:06:37.674: INFO/dalvikvm(15628): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=30) 07-09 18:06:37.754: INFO/ActivityManager(82): Displayed activity com.droidnova.android.howto.optionmenu/.Test: 6140 ms (total 6140 ms) 07-09 18:06:37.884: DEBUG/HtcWidgetScanner(371): action - android.intent.action.PACKAGE_ADDED 07-09 18:06:37.884: DEBUG/HtcWidgetScanner(371): packageUid - 10078 07-09 18:06:38.244: DEBUG/PackageInstallationReceiver(234): Removing.../data/local/tmp/com.droidnova.android.howto.optionmenu.apk 07-09 18:06:38.524: DEBUG/vending(553): [211] LocalAssetCache.updateOnePackage(): No local info for com.droidnova.android.howto.optionmenu 07-09 18:06:38.924: ERROR/PackageInstallationReceiver(234): Remove /data/local/tmp/com.droidnova.android.howto.optionmenu.apk Fail! 07-09 18:06:38.935: WARN/System.err(234): java.io.IOException: Error running exec(). Commands: [/system/xbin/su, 0, /system/bin/rm, /data/local/tmp/com.droidnova.android.howto.optionmenu.apk] Working Directory: null Environment: null 07-09 18:06:38.984: WARN/System.err(234): at java.lang.ProcessManager.exec(ProcessManager.java:196) 07-09 18:06:38.984: WARN/System.err(234): at java.lang.Runtime.exec(Runtime.java:225) 07-09 18:06:38.994: WARN/System.err(234): at java.lang.Runtime.exec(Runtime.java:313) 07-09 18:06:39.004: WARN/System.err(234): at java.lang.Runtime.exec(Runtime.java:246) 07-09 18:06:39.004: WARN/System.err(234): at com.htc.android.psclient.PackageInstallationReceiver.removeTempPackageFile(PackageInstallationReceiver.java:34) 07-09 18:06:39.015: WARN/System.err(234): at com.htc.android.psclient.PackageInstallationReceiver.access$000(PackageInstallationReceiver.java:8) 07-09 18:06:39.025: WARN/System.err(234): at com.htc.android.psclient.PackageInstallationReceiver$1.run(PackageInstallationReceiver.java:24) 07-09 18:06:39.025: WARN/System.err(234): Caused by: java.io.IOException: No such file or directory 07-09 18:06:39.044: WARN/System.err(234): at java.lang.ProcessManager.exec(Native Method) 07-09 18:06:39.054: WARN/System.err(234): at java.lang.ProcessManager.exec(ProcessManager.java:194) 07-09 18:06:39.054: WARN/System.err(234): ... 6 more 07-09 18:06:39.074: INFO/ActivityManager(82): Start proc com.google.android.apps.maps:FriendService for broadcast com.google.android.apps.maps/com.google.googlenav.friend.android.ServiceReceiver: pid=15637 uid=10033 gids={3003, 1015} 07-09 18:06:39.465: INFO/dalvikvm(15637): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=38) 07-09 18:06:39.515: INFO/dalvikvm(15637): Debugger thread not active, ignoring DDM send (t=0x41504e4d l=88) 07-09 18:06:41.274: DEBUG/dalvikvm(15637): GC freed 1881 objects / 141632 bytes in 184ms 07-09 18:06:41.524: DEBUG/LocationManager(15637): Constructor: service = android.location.ILocationManager$Stub$Proxy@448bffb0 07-09 18:06:41.615: DEBUG/NetworkLocationProvider(82): setMinTime: 540000 07-09 18:06:41.824: DEBUG/WifiService(82): acquireWifiLockLocked: WifiLock{NetworkLocationProvider type=2 binder=android.os.Binder@44d4ea68} 07-09 18:06:41.824: DEBUG/WifiService(82): enable and start wifi due to updateWifiState 07-09 18:06:41.894: INFO/ActivityManager(82): Process com.mamlambo.imageswidget (pid 15615) has died. 07-09 18:06:41.934: INFO/UsageStats(82): Something wrong here, didn't expect com.droidnova.android.howto.optionmenu to be paused 07-09 18:06:41.984: WARN/dalvikvm(82): disableGcForExternalAlloc: false 07-09 18:06:42.115: DEBUG/NetworkLocationProvider(82): onCellLocationChanged [1413,68270998] 07-09 18:06:42.594: INFO/ActivityManager(82): Start proc com.mamlambo.imageswidget for broadcast com.mamlambo.imageswidget/.ImagesWidgetProvider: pid=15643 uid=10093 gids={1015} 07-09 18:06:42.625: INFO/ActivityManager(82): Process com.svox.pico (pid 15628) has died. 07-09 18:06:42.814: DEBUG/ddm-heap(15643): Got feature list request 07-09 18:06:42.985: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:42.985: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:43.044: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:43.055: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:43.104: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:43.104: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:43.154: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:43.154: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:46.784: DEBUG/WifiService(82): releaseWifiLockLocked: WifiLock{NetworkLocationProvider type=2 binder=android.os.Binder@44d4ea68} 07-09 18:06:46.784: DEBUG/WifiService(82): enable and start wifi due to updateWifiState 07-09 18:06:47.425: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:47.425: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:52.425: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:52.425: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:06:57.465: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:06:57.484: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:07:02.424: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:07:02.424: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:07:07.424: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:07:07.424: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:07:12.464: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:07:12.485: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:07:17.495: VERBOSE/com.mickeyc.batmon.Batreceiver(580): onReceive called - com.mickeyc.batmon.RECORD 07-09 18:07:17.544: DEBUG/ImagesWidgetProvider(15643): OnReceive:Action: android.appwidget.action.APPWIDGET_UPDATE 07-09 18:07:17.544: DEBUG/ImagesWidgetProvider(15643): onUpdate(): 07-09 18:07:17.594: VERBOSE/com.mickeyc.batmon.Batreceiver(580): Recording data (100) 07-09 18:07:17.614: VERBOSE/Batreceiver(580): setLevel(100,100) </code></pre>
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    1. COhave you checked that your array list contains the data you expect before your trying to convert it to an array?
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    2. COIn the url there is image so it will have the value listItems.add(jo.getString("http://midsweden.gofreeserve.com/proj/admin/pictures/file87619.JPG")); please guide if there is other way to check
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    3. COuse logcat with a statement like Log.d("ArrayList","List: "+listItems); this will display the contents of the arraylist, so put it after your try/catch. If it says null then you know the data is not being put into your list correctly
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