How to get data from array of jsonarray from a PHP?

This is the output I am getting from my server script:

{"task_id":"1","task_create_time":"2015-08-09 22:48:25","task_end_time":"0000-00-00 ``00:00:00","service_id":"2","task_status":"1","user_id":"1","user_email":"[email protected]","user_name":"rr","user_mobile":"1234567890"}{"task_id":"3","task_create_time":"2015-08-13 00:23:54","task_end_time":"0000-00-00 00:00:00","service_id":"2","task_status":"1","user_id":"2","user_email":null,"user_name":null,"user_mobile":null}

I want to convert this output to a custom list in Android, but I am getting many errors. My code:

try {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(url_jobdetail);
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();
    is = entity.getContent();

    // Toast.makeText(getApplicationContext(), “pass”,
    // Toast.LENGTH_SHORT).show();
} catch (Exception e) {

}
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
    sb.append(line + "\n");         
}
is.close();

result = sb.toString();

this the error i am getting

08-13 12:42:34.935: I/InputMethodManager(23564): handleMessage: MSG_SET_ACTIVE true, was false

08-13 12:42:39.463: D/AbsListView(23564): checkAbsListViewlLogProperty get invalid command 08-13 12:42:39.478: D/AndroidRuntime(23564): Shutting down VM 08-13 12:42:39.478: W/dalvikvm(23564): threadid=1: thread exiting with uncaught exception (group=0x40cb49c0) 08-13 12:42:39.499: E/AndroidRuntime(23564): FATAL EXCEPTION: main 08-13 12:42:39.499: E/AndroidRuntime(23564): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.OnDeOS.ondeos_internal/com.OnDeOS.ondeos_internal.jobs}: java.lang.NullPointerException 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread.access$600(ActivityThread.java:162) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.os.Handler.dispatchMessage(Handler.java:107) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.os.Looper.loop(Looper.java:194) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread.main(ActivityThread.java:5371) 08-13 12:42:39.499: E/AndroidRuntime(23564): at java.lang.reflect.Method.invokeNative(Native Method) 08-13 12:42:39.499: E/AndroidRuntime(23564): at java.lang.reflect.Method.invoke(Method.java:525) 08-13 12:42:39.499: E/AndroidRuntime(23564): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 08-13 12:42:39.499: E/AndroidRuntime(23564): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 08-13 12:42:39.499: E/AndroidRuntime(23564): at dalvik.system.NativeStart.main(Native Method) 08-13 12:42:39.499: E/AndroidRuntime(23564): Caused by: java.lang.NullPointerException 08-13 12:42:39.499: E/AndroidRuntime(23564): at com.OnDeOS.ondeos_internal.jobs.onCreate(jobs.java:67) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.Activity.performCreate(Activity.java:5122) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081) 08-13 12:42:39.499: E/AndroidRuntime(23564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307) 08-13 12:42:39.499: E/AndroidRuntime(23564): ... 11 more