title: "Specified child already has a parent.You must call removeView() on child's parent first." Exception in android
body: <p>I am retrieving information from server and trying to display it in a tabular format,hence using json object.</p>
  
  <p><strong>Code :</strong></p>
  
  <pre><code>  JSONArray jsonArray = new JSONArray(jsonResult);
                  TableLayout tv=(TableLayout) findViewById(R.id.table);
                  tv.removeAllViewsInLayout();
  
                  int flag=1;
                  for (int i = 0; i &lt; jsonArray.length() ; i++) {
                      //JSONObject object1 = jsonArray.getJSONObject(i);
  
                          TableRow tr=new TableRow(viewtimetable.this);
  
                          tr.setLayoutParams(new LayoutParams(
                                     LayoutParams.FILL_PARENT,
                                     LayoutParams.WRAP_CONTENT));
  
                          if(flag==1)
                          {
  
                              TextView col1=new TextView(viewtimetable.this);
                               col1.setText("Day");
                               col1.setTextColor(Color.BLUE);
                               col1.setTextSize(15);
                               tr.addView(col1);
  
  
                              TextView col2=new TextView(viewtimetable.this);
                               col2.setPadding(10, 0, 0, 0);
                               col2.setTextSize(15);
                               col2.setText("7:30-9:10AM");
                               col2.setTextColor(Color.BLUE);
                               tr.addView(col2);
  
                              TextView col3=new TextView(viewtimetable.this);
                               col3.setPadding(10, 0, 0, 0);
                               col3.setText("9:20-11:00AM");
                               col3.setTextColor(Color.BLUE);
                               col3.setTextSize(15);
                               tr.addView(col3);
  
                              TextView col4=new TextView(viewtimetable.this);
                               col4.setPadding(10, 0, 0, 0);
                               col4.setText("11:10-12:50PM");
                               col4.setTextColor(Color.BLUE);
                               col4.setTextSize(15);
                               tr.addView(col4);
  
                              TextView col5=new TextView(viewtimetable.this);
                               col5.setPadding(10, 0, 0, 0);
                               col5.setText("1:40-3:20PM");
                               col5.setTextColor(Color.BLUE);
                               col5.setTextSize(15);
                               tr.addView(col5);
  
                              TextView col6=new TextView(viewtimetable.this);
                               col6.setPadding(10, 0, 0, 0);
                               col6.setText("3:30-5:00PM");
                               col6.setTextColor(Color.BLUE);
                               col6.setTextSize(15);
                               tr.addView(col6);
  
                               tv.addView(tr);
  
                               final View vline = new View(viewtimetable.this);
  
                               vline.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 2));
                               vline.setBackgroundColor(Color.BLUE);
  
  
  
                          tv.addView(vline);
                          flag=0;
  
  
                          }
  
                          else
                          {
  
                         try{
  
                              JSONObject json_data = jsonArray.getJSONObject(i);
  
                              //Log.i("log_tag","id: "+json_data.getInt("f1")+
                               //         ", Username: "+json_data.getString("f2")+
                                 //       ", No: "+json_data.getInt("f3"));
  
  
                              //((ViewGroup)tr.getParent()).removeView(tr);
  
                      TextView b=new TextView(viewtimetable.this);
                          String stime=json_data.getString("day");
                          b.setText(stime);
                          b.setTextColor(Color.RED);
                          b.setTextSize(15);
                          tr.addView(b);
  
  
                         TextView b1=new TextView(viewtimetable.this);
                          b1.setPadding(10, 0, 0, 0);
                          b1.setTextSize(15);
                          if(json_data.getString("slot").equals("7:30-9:10AM")){
                          String stime1=json_data.getString("subject");
                           b1.setText(stime1);
                          }
                          b1.setTextColor(Color.WHITE);
                          tr.addView(b1);
  
                        TextView b2=new TextView(viewtimetable.this);
                       b2.setPadding(10, 0, 0, 0);
  
                          if(json_data.getString("slot").equals("9:20-11:00AM")){
                              String stime2=json_data.getString("subject");
                               b2.setText(stime2);
                              }
                          b2.setTextColor(Color.RED);
                          b2.setTextSize(15);
                          tr.addView(b2);
  
                          TextView b3=new TextView(viewtimetable.this);
                          b3.setPadding(10, 0, 0, 0);
  
                             if(json_data.getString("slot").equals("11:10-12:50PM")){
                                 String stime3=json_data.getString("subject");
                                  b3.setText(stime3);
                                 }
                             b3.setTextColor(Color.RED);
                             b3.setTextSize(15);
                             tr.addView(b2);  
  
                             TextView b4=new TextView(viewtimetable.this);
                             b4.setPadding(10, 0, 0, 0);
  
                                if(json_data.getString("slot").equals("1:40-3:20PM")){
                                    String stime4=json_data.getString("subject");
                                     b4.setText(stime4);
                                    }
                                b4.setTextColor(Color.RED);
                                b4.setTextSize(15);
                                tr.addView(b2);     
  
                                TextView b5=new TextView(viewtimetable.this);
                                b5.setPadding(10, 0, 0, 0);
  
                                   if(json_data.getString("slot").equals("3:30-5:00PM")){
                                       String stime5=json_data.getString("subject");
                                        b5.setText(stime5);
                                       }
                                   b5.setTextColor(Color.RED);
                                   b5.setTextSize(15);
                                   tr.addView(b2);        
  
                            tv.addView(tr);
  
  
                         }catch(JSONException e){
                             content.setText("jsonexception");
                         }
                  final View vline1 = new View(viewtimetable.this);
                vline1.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 1));
                vline1.setBackgroundColor(Color.WHITE);
                tv.addView(vline1);       
  
  
                          }
  </code></pre>
  
  <p>After searching for a solution i found <a href="https://stackoverflow.com/questions/6526874/call-removeview-on-the-childs-parent-first">here</a> but i don't know where to use this line.I am not getting about which child the exception is!It would be a great help if you can explain this.</p>
  
  <p><strong>Question:</strong>
  I know from the above link that the following line is the solution for my problem.</p>
  
  <pre><code>((ViewGroup)scrollChildLayout.getParent()).removeView(scrollChildLayout);
  </code></pre>
  
  <p>But in my case where,how and why to use this? </p>