Question

I have following code and i want to pass additional parameter in JSON.getJSONfromURL() method but when i check on android it throws this exception

04-11 11:58:18.929: E/AndroidRuntime(566): FATAL EXCEPTION: main 04-11
11:58:18.929: E/AndroidRuntime(566): java.lang.RuntimeException:
Unable to start activity
ComponentInfo{cyclist.project/cyclist.project.user_discussion}:
java.lang.NullPointerException 04-11 11:58:18.929:
E/AndroidRuntime(566): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-11 11:58:18.929: E/AndroidRuntime(566): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-11 11:58:18.929: E/AndroidRuntime(566): at
android.app.ActivityThread.access$2300(ActivityThread.java:125) 04-11
11:58:18.929: E/AndroidRuntime(566): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-11 11:58:18.929: E/AndroidRuntime(566): at
android.os.Handler.dispatchMessage(Handler.java:99) 04-11
11:58:18.929: E/AndroidRuntime(566): at
android.os.Looper.loop(Looper.java:123) 04-11 11:58:18.929:
E/AndroidRuntime(566): at
android.app.ActivityThread.main(ActivityThread.java:4627) 04-11
11:58:18.929: E/AndroidRuntime(566): at
java.lang.reflect.Method.invokeNative(Native Method) 04-11
11:58:18.929: E/AndroidRuntime(566): at
java.lang.reflect.Method.invoke(Method.java:521) 04-11 11:58:18.929:
E/AndroidRuntime(566): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-11 11:58:18.929: E/AndroidRuntime(566): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 04-11
11:58:18.929: E/AndroidRuntime(566): at
dalvik.system.NativeStart.main(Native Method) 04-11 11:58:18.929:
E/AndroidRuntime(566): Caused by: java.lang.NullPointerException 04-11
11:58:18.929: E/AndroidRuntime(566): at
cyclist.project.JSON.getJSONfromURL(JSON.java:60) 04-11 11:58:18.929:
E/AndroidRuntime(566): at
cyclist.project.user_discussion.setList(user_discussion.java:250)
04-11 11:58:18.929: E/AndroidRuntime(566): at
cyclist.project.user_discussion.onCreate(user_discussion.java:154)
04-11 11:58:18.929: E/AndroidRuntime(566): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-11 11:58:18.929: E/AndroidRuntime(566): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-11 11:58:18.929: E/AndroidRuntime(566): … 11 more

Code:

    JSONObject json;

    try {
        json = new JSONObject(
        JSON.getJSONfromURL("http://myweb.com/ws_cyc/events_service.php?action=get_chats&title=fsfbnn" ));
    JSONArray miles = json.getJSONArray("cyc");
    JSONObject rec;
    JSONObject rec2 = null; 

    for (int i=0; i<miles.length(); i++){
                rec = miles.getJSONObject(i);
                rec2 = rec.getJSONObject("cycObject");
                new discussion_item(rec2.getString("Chats").toString());
                ImgList.add( rec2.getString("image_path").toString() );
                list.add( rec2.getString("email").toString() + ": " + rec2.getString("Chats").toString() );
            }                                   
    } catch (JSONException e) {
            e.printStackTrace();
        }   

Please guide me how to pass additional parameters in JSON.getJSONfromURL() and how php will get it , my php code to catch jason is

$titlez = json_decode($_GET['title']);

Answer 1

As the error log says, it is caused by null Value being passed and attempted to be processed at line 154 of the file user_discussion.java