NullPointerException happens for some list items

Question

I have a custom listview in my app which fills by JSON and I'm using bitmap to fill images in listView and I want to get a TextView value inside the list item that has been clicked

lView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  @Override
  public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    try {
          hotel_id = (int) adapterView.getItemIdAtPosition(i);
          TextView id= (TextView) lView.getChildAt(i).findViewById(R.id.aNametxt);
          type_id_post = deleteIcon.getText().toString();

          backgroundTask = new BackgroundTask(textView);
          backgroundTask.execute();

          Intent intent = new Intent(RoomList.this, RoomPopUp.class);
          startActivity(intent);

        }
    catch (RuntimeException e){
          e.printStackTrace();
    }
  }
});

and it works for the first two items of the list but for another item app will stop on hotel_id definition line and this is logcat when I click an item except for the first two items :

08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: java.lang.NullPointerException
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at com.test.RoomList$1.onItemClick(RoomList.java:126)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.widget.AdapterView.performItemClick(AdapterView.java:299)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.widget.AbsListView.performItemClick(AbsListView.java:1158)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.widget.AbsListView$PerformClick.run(AbsListView.java:2957)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.widget.AbsListView$3.run(AbsListView.java:3849)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.os.Looper.loop(Looper.java:136)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5105)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
08-07 11:43:36.026 14747-14747/com.moalem.khane.khanemoalem W/System.err: at dalvik.system.NativeStart.main(Native Method)

the point is all item's id TextView of the list are casting to one id but it for "SOME" items that id is null is there anyone who knows what is the problem of this?

TextView id= (TextView) lView.getChildAt(i).findViewById(R.id.aNametxt); — Shakib Karami, Aug 07 '18 at 08:28
`lView.getChildAt(i)` is null likely. That is beacuse ListView is working not as you expect it to work. It doesn't have as much views as the items in the list — Vladyslav Matviienko, Aug 07 '18 at 08:32
well there is no reason for that my list got 6 items but for example lView.getChildAt(3) is null — Shakib Karami, Aug 07 '18 at 08:34
6 and when on print position of each one in logcat i can see each id off all items by clicking on them but for last four item this warning will appear and activity won't be started — Shakib Karami, Aug 07 '18 at 08:39
anyway, that is not the way to do that. You can use a `View view` parameter. It is exactly the clicked ListView row view — Vladyslav Matviienko, Aug 07 '18 at 08:46

NullPointerException happens for some list items

0 Answers0