How do I use Key Listener to close a panel?

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• Fragment using ViewPager, getting getTag/getId as null

  I am a newbie to android and Stack Overflow, help will be appreciated here.

  I have created multiple fragments like below FragmentA, using View Pager. Now I have a requirement where that on button click whenever I have to take all of the input data from all of the fragment and need to submit that data somewhere.

  I just came to know that after swiping from FragmentA to FragmentC my FragmentA activity will destroy, so I thought of saving that activity somewhere and i just have saved that in List.

  While swiping from current FragmentA to FragmentC and after coming back on FragmentA . I am trying to getTag/getId of my EDITText view in my case I am getting that as null

  I have tried multiple ways. What am I missing in my code as part of the standard, what have I done wrong in my code and
  how I have to think on my requirement?

  I even have tried SharedPreferences for storing values for final submission, in that case, I have faced "OutOfMemoryError". Then directly adding that view to List, then while coming back to fragment I have tried that view to add in the parent, this also won't work for me.

  Thanks, Shadab.

  FragmentA.java:

   public class FragmentA extends Fragment {
  
          //Edit text
          TextInputLayout basics_TextInputLayout1, basics_TextInputLayout2, 
             basics_TextInputLayout3, basics_TextInputLayout4, 
             basics_TextInputLayout5, basics_TextInputLayout6, 
             basics_TextInputLayout7, basics_TextInputLayout8, 
             basics_TextInputLayout9, basics_TextInputLayout10, 
             basics_TextInputLayout11;
          TextInputLayout[] arrayOfEditText;
          ArrayList<TextInputLayout> setEditTextLayouts = null;
          ArrayList<String> textHintCaptionValuesListFromDb = null;
          //ArrayList<View> setTextViewList;
  
          //Add views
          ArrayList<View> addEditTextView;
          boolean isbuttonClicked=false;
          private Bundle savedState = null;
          Button button;
          boolean onCreate;
          VillageServeyBean  villageSubmitBasicsFormList;
          View v;
  
          //testlistr
  
          @Override
          public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
              v = inflater.inflate(R.layout.activity_village_basics_info, container, false);
              if(!isbuttonClicked && savedState==null) {
                  //EditText Boxes            
                   arrayOfEditText = new TextInputLayout[]{basics_TextInputLayout1, basics_TextInputLayout2, basics_TextInputLayout3, basics_TextInputLayout4, basics_TextInputLayout5,
                   basics_TextInputLayout6, basics_TextInputLayout7, basics_TextInputLayout8, basics_TextInputLayout9, basics_TextInputLayout10, basics_TextInputLayout11};
                   setEditTextLayouts = new ArrayList<TextInputLayout>();
                   //getLayout and initialize
                          DynamicFieldUpdate.getTextInputLayoutBasedOnTagName(arrayOfEditText, v, Constant.BASICS_TAG_EDITTEXT, setEditTextLayouts);
                   addEditTextView = new ArrayList<View>();
  
                   //call weservice for fields
                   new CallWebservices().execute();
               }
  
               if(savedInstanceState != null && savedState == null) {
                   savedState = savedInstanceState.getBundle("BasicInfoScreen");
               }
               if(savedState != null) {
                   setDataToFormOnComingBackAgaing();
               }
  
               return v;            
          }
  
          private void setDataToFormOnComingBackAgaing(/*View v*/) {
              if (savedState!= null) {
                  HashMap<String,ArrayList> listToGetFromBundle = new HashMap<String,ArrayList>();
                  listToGetFromBundle = (HashMap<String, ArrayList>) savedState.getSerializable("DataInBasicsBundle");
                  ArrayList<String> listText = (ArrayList) listToGetFromBundle.get("BasicsTextHint");
                  ArrayList<View> listView = (ArrayList) listToGetFromBundle.get("BasicsInputEditTextValuesView");
                  for (String text : listText) {
                      System.out.println("Text Of Basics Screen " + text);
                  }
  
                  TextInputEditText editText0 = (TextInputEditText) listView.get(0);
                  if (editText0 != null) {
                      int st = editText0.getId();
                      TextInputEditText editText= (TextInputEditText) v.findViewById(st);
                      editText.setText(editText0.getText());
                      // System.out.println(" Basics id : - " + editText0.getId());
                      System.out.println("  tagName : - : - " + editText0.getTag());
                      System.out.println(" hint : -  : - " + editText0.getHint());
                      System.out.println("Values:  Basics :- -  : - " + editText0.getText());
  
                  } TextInputEditText editText1 = (TextInputEditText) listView.get(1);
                  if (editText1 != null) {
                      String st = editText1.getTag().toString();
                      TextInputEditText editText= (TextInputEditText) getActivity().findViewById(st.trim().hashCode());
                      editText.setText(editText1.getText());
                      //System.out.println(" Basics id : - " + editText1.getId());
                      System.out.println(" tagName : - " + editText1.getTag());
                      System.out.println(" hint : - " + editText1.getHint());
                      System.out.println("Values:  Basics :- - " + editText1.getText());
  
                  }            
              }
          }
  
          @Override
          public void onActivityCreated(@Nullable Bundle savedInstanceState) {
              super.onActivityCreated(savedInstanceState);
              // setDataToFormOnComingBackAgaing();
              // View detailsFrame = getActivity().findViewById(R.id.details);
          }
  
          //till here
          private boolean getTextFieldsCaptionsValuesFromDb() {
              boolean isServicedParsed = false;
              String responseData = Utility.callwebService(Constant.GETVILLAGEBASICSSCREENFIELDS, Constant.GET, null);
              if (Utility.isNotNullAndEmpty(responseData)) {
                  System.out.println("Response data := " + responseData);
                  isServicedParsed = parseResponseData(responseData);
              } else {
                  //show error
              }
              return isServicedParsed;
          }
  
          private boolean parseResponseData(String responseData) {
              boolean flag = false;
              try {
                  JSONArray jsonArray = new JSONArray(responseData);
                  textHintCaptionValuesListFromDb = new ArrayList<String>();
                  for (int i = 0; i < jsonArray.length(); i++) {
                      JSONObject jsonObj = jsonArray.getJSONObject(i);
                      textHintCaptionValuesListFromDb.add(jsonObj.getString("textFields"));
                      System.out.println("Data ya aaaa : " + jsonObj.getString("textFields"));
                      if(!flag) {
                          flag= true;
                      }
                   }
               } catch (JSONException e) {
                   e.printStackTrace();
               }
                   return flag;
           }
  
           private class CallWebservices extends AsyncTask<Void, Void, Boolean> {
               @Override
               protected void onPostExecute(Boolean sucess) {
                   if (sucess) {                            
                       DynamicFieldUpdate.setTextInputLayout(setEditTextLayouts, textHintCaptionValuesListFromDb, getContext(), 1,addEditTextView);
                   }
               }
  
               @Override
               protected Boolean doInBackground(Void... voids) {
                   return getTextFieldsCaptionsValuesFromDb();
               }
           }
  
           //adding for  saving instance of fragments
           @Override
           public void onDestroyView() {
               super.onDestroyView();
               savedState = saveState();
           }
  
           private Bundle saveState() {
               Bundle state = new Bundle();
               VillageServeyBean villageServeyBean = new VillageServeyBean();
               ArrayList<Map<String,ArrayList>> listToAddInShrdPrefncAndBundl= new ArrayList<Map<String,ArrayList>>();
               //GetData and add in bean
               GetAddedListToAddInBundle(listToAddInShrdPrefncAndBundl,state);
               setFormSubmitDataHere(listToAddInShrdPrefncAndBundl);
               return state;
           }
  
           private void GetAddedListToAddInBundle(ArrayList<Map<String, ArrayList>> listToAddInBundle, Bundle state ) {
               HashMap<String,ArrayList> putListToBundle =new HashMap<String,ArrayList>();
               ArrayList<View> test = new ArrayList<>();
               if(textHintCaptionValuesListFromDb!=null) {
                   putListToBundle.put("BasicsTextHint", textHintCaptionValuesListFromDb);
               }
               if(addEditTextView != null)                        
                   putListToBundle.put("BasicsInputEditTextValuesView", addEditTextView);
                   listToAddInBundle.add(putListToBundle);
                   state.putSerializable("DataInBasicsBundle",putListToBundle);
                   EditText editT = (EditText) addEditTextView.get(0);
                   /*int st = editT.getId();
                   View editText= (View) getActivity().findViewById(st) ;*/
                   test.add(editT);
                   state.putSerializable("sub_conatainer1_Basic",test);
               }
  
               @Override
               public void onSaveInstanceState(Bundle outState) {
                   super.onSaveInstanceState(outState);
                   outState.putBundle("BasicInfoScreen", (savedState != null) ? savedState : saveState());
               }            
  
               public void setFormSubmitDataHere(ArrayList<Map<String,ArrayList>> submitFormList){
                   villageSubmitBasicsFormList = new VillageServeyBean();
  
    villageSubmitBasicsFormList.setListToAddInShrdPrefnc(submitFormList);
               }
  
               public VillageServeyBean getFormSubmitDataHere(){
                   return villageSubmitBasicsFormList;
               }
  
           } 
  

  And have Created Below Methods to create some view of my layout pragmatically like EditText and Spinner etc

  ---

  public class DynamicFieldUpdate {  
  
    public static void setCheckBoxes(LinearLayout layout, ArrayList<String> list, Context context,ArrayList<View> viewList ) {
          for (int i = 0; i < list.size(); i++) {
              CheckBox cb = new CheckBox(context);
              cb.setText(list.get(i));
              cb.setId(list.get(i).hashCode());
              layout.addView(cb);
          }
          viewList.add(layout);    
      }
  
      public static void setTextView(LinearLayout layout,String setText,Context context,int size,ArrayList<View> viewList ) {
          TextView tv = new TextView(context);
          tv.setText(setText);
          tv.setTag(setText);
          tv.setTextSize(size);
          layout.addView(tv);
           viewList.add(tv);  
      }
  
      public static void setEditText(TextInputLayout layout,String setHint , Context context,int i,ArrayList<View> viewList ){
          TextInputEditText textInputLayout = new TextInputEditText(context);
          LinearLayout.LayoutParams editTextParams = new LinearLayout.LayoutParams(
                  LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
          textInputLayout.setLayoutParams(editTextParams);
          System.out.println("Integer values of hint :-"+setHint.trim().hashCode() + " field"+setHint);
          textInputLayout.setId(setHint.trim().hashCode());
          textInputLayout.setTag(layout.getTag());
          textInputLayout.setHint(setHint);
          textInputLayout.setInputType(getInputType(i));
          layout.addView(textInputLayout);
          viewList.add(textInputLayout);
      }
  
  
      public static void setCustomRadioGroup(LinearLayout layout,Context context,ArrayList<String> setName,ArrayList<View> viewList ){
          int sizeOfList=setName.size();
          final RadioButton[] radioButtons = new RadioButton[setName.size()];
          RadioGroup radioGroup = new RadioGroup(context);
          //radioGroup.setTag();//create the RadioGroup
          if(setName.size()<3){
              radioGroup.setOrientation(RadioGroup.HORIZONTAL);
          } else {
              radioGroup.setOrientation(RadioGroup.VERTICAL);
          }
         //or RadioGroup.VERTICAL
          for(int i=0; i<setName.size(); i++) {
              radioButtons[i] = new RadioButton(context);
              radioButtons[i].setText(setName.get(i));
              radioButtons[i].setId(i);
              radioGroup.addView(radioButtons[i]);
          }
          layout.addView(radioGroup);
          viewList.add(radioGroup);
  
      }
  
          private static int getInputType(int i) {
              int retValue = InputType.TYPE_NULL;
              switch (i) {
  
                  case 1:
                      retValue = InputType.TYPE_CLASS_TEXT;
                      break;
                  case 2:
                      retValue = InputType.TYPE_CLASS_NUMBER;
                      break;
                  case 4:
                      retValue = InputType.TYPE_CLASS_PHONE;
                      break;
                  case 5:
                      retValue = InputType.TYPE_TEXT_VARIATION_PASSWORD;
                      break;
                  case 6:
                      retValue = InputType.TYPE_CLASS_PHONE;
                      break;
                  case 7:
                      retValue = InputType.TYPE_CLASS_DATETIME;
                      break;
  
                  default:
                      break;
              }
              return retValue;
          }
  
  
          // get linear layouts from Views on bases of TAG name, and initialize that view
          public static void getLinearLayoutBasedOnTagName(LinearLayout[] layout ,View v,String tagName,ArrayList setListOfLinearLayout){
              for(int i = 0 ; i<layout.length;i++){
                  int k = i+1;
                  layout[i]=(LinearLayout) v.findViewWithTag(tagName+k);
                  setListOfLinearLayout.add(layout[i]);
              }
  
          }
  
          // get EDITText layouts from Views on bases of TAG name, and initialize that view
          public static void getTextInputLayoutBasedOnTagName(TextInputLayout[] layout ,View v,String tagName,ArrayList setListOfTextInputLayout){
              for(int i = 0 ; i<layout.length;i++){
                  int k = i+1;
                  layout[i]=(TextInputLayout) v.findViewWithTag(tagName+k);
                  setListOfTextInputLayout.add(layout[i]);
              }
  
          }
  
          //set radio button values to corresponding caption
          public static void setRadioButtonsValues(ArrayList<LinearLayout> setRadioGroupValuesLinearLayoutList,ArrayList<ArrayList<String>> radionButtonTextCaptionValuesListFromDb,Context context,ArrayList<View> viewList ) {
              for (int i = 0; i < setRadioGroupValuesLinearLayoutList.size(); i++) {
                  DynamicFieldUpdate.setCustomRadioGroup(setRadioGroupValuesLinearLayoutList.get(i), context,radionButtonTextCaptionValuesListFromDb.get(i),viewList);
              }
          }
  
  
          //set radio button caption text
          public static void setTextViewCaptionValues(ArrayList<LinearLayout> setRadioButtonCaptionsLayoutList,ArrayList radionButtonTextCaptionValuesListFromDb,Context context, int size ,ArrayList<View> viewList ) {
              for (int i = 0; i < setRadioButtonCaptionsLayoutList.size(); i++) {
                  DynamicFieldUpdate.setTextView(setRadioButtonCaptionsLayoutList.get(i), radionButtonTextCaptionValuesListFromDb.get(i).toString(), context, size,viewList);
              }
  
          }
  
          //set edit text
          public static void setTextInputLayout(ArrayList<TextInputLayout> setTextInputLayout,ArrayList radionButtonTextCaptionValuesListFromDb,Context context, int inputType ,ArrayList<View> viewList){
              for (int i = 0; i < setTextInputLayout.size(); i++) {
                  DynamicFieldUpdate.setEditText(setTextInputLayout.get(i), radionButtonTextCaptionValuesListFromDb.get(i).toString(), context, inputType,viewList);
              }
          }
  
  
          public static void getMultipleCheckLayoutBasedOnTagName(MultiSelectionSpinner[] layout ,View v,String tagName,ArrayList setListOfMultiSelectionSpinnerLayout){
              for(int i = 0 ; i<layout.length;i++){
                  int k = i+1;
                  setListOfMultiSelectionSpinnerLayout.add(tagName+k);
              }
  
          }
          public static void setMultiCheckBoxesLayout(ArrayList<String> tagName,View v,ArrayList<ArrayList<String>> listToAdd, MultiSelectionSpinner.OnMultipleItemsSelectedListener listner,Context context,ArrayList<View> viewList){
              for (int i = 0; i < tagName.size(); i++) {
                  DynamicFieldUpdate.setMultipleCheckBoxesSelector(tagName.get(i),v, listToAdd.get(i),listner, context,viewList);
              }
          }
  
          public static void setMultipleCheckBoxesSelector(String tagName, View v, ArrayList<String> listToAdd, MultiSelectionSpinner.OnMultipleItemsSelectedListener listner, Context context,ArrayList<View> viewList){
              MultiSelectionSpinner multiSelectionSpinner1 = (MultiSelectionSpinner) v.findViewWithTag(tagName);
              multiSelectionSpinner1.setItems(listToAdd);
              multiSelectionSpinner1.setSelection(new int[]{0});
              multiSelectionSpinner1.setListener(listner);
              viewList.add(multiSelectionSpinner1);
          }
      }       
  }
  
• How to get the bytes of a string?

  The Backstory

  We've been asked to recreate a legacy system (from Java to PHP, namely Laravel) however it has been stressed that we need to port all the old users to the new system. The old system is using Ofbiz (a very old version too).

  The Problem

  The old system is using outdated hash algorithms.

  I've scoured through the Ofbiz codebase to find the hashing class and located the following functions:

  HashCrypt.java

  public static String cryptPassword(String hashType, String password) {
      int saltLength = new Random().nextInt(15) + 1;
      return cryptPassword(hashType, RandomStringUtils.random(saltLength, CRYPT_CHAR_SET), password);
  }
  
  public static String cryptPassword(String hashType, String salt, String password) {
      StringBuilder sb = new StringBuilder();
      sb.append("$").append(hashType).append("$").append(salt).append("$");
      sb.append(getCrypted(hashType, salt, password));
      return sb.toString();
  }
  
  private static String getCrypted(String hashType, String salt, String password) {
      try {
          MessageDigest messagedigest = MessageDigest.getInstance(hashType);
          messagedigest.update(salt.getBytes("UTF-8"));
          messagedigest.update(password.getBytes("UTF-8"));
          return Base64.encodeBase64URLSafeString(messagedigest.digest()).replace('+', '.');
      } catch (NoSuchAlgorithmException e) {
          throw new GeneralRuntimeException("Error while comparing password", e);
      } catch (UnsupportedEncodingException e) {
          throw new GeneralRuntimeException("Error while comparing password", e);
      }
  }
  

  I've recreated everything up to:

  sb.append(getCrypted(hashType, salt, password));
  

  In PHP without any issues, however, I'm stumped on when getCrypted is called. It runs the following two snippets:

  messagedigest.update(salt.getBytes("UTF-8"));
  messagedigest.update(password.getBytes("UTF-8"));
  

  I've done some basic debugging and noticed that the salt value is changed when getBytes is performed on it, as an example:

  Salt (Pre getBytes): DP1OpoA

  Salt (Post getBytes: [B@5338f526

  This means that unless I can find a equivalent of getBytes in PHP, it will not be possible for me to recreate this.

  The following is the PHP class so far:

  OfbizPassword.php

  class OfbizPassword {
      const HASH_TYPE = 'sha1';
      const HASH_APPEND = 'SHA';
  
      public static function hash($password, $salt = '')
      {
          if (empty($salt))
            $salt = self::random_str(random_int(1, 15));
  
          $hash = '$' . self::HASH_APPEND;
          $hash .=  '$' . $salt;
      }
  
      private static function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
      {
          $pieces = [];
          $max = mb_strlen($keyspace, '8bit') - 1;
  
          for ($i = 0; $i < $length; ++$i) {
              $pieces[] = $keyspace[random_int(0, $max)];
          }
  
          return implode('', $pieces);
      }
  
      private static function base64_url_encode($input) {
        return strtr(base64_encode($input), '+/=', '._-');
      }
  
      private static function base64_url_decode($input) {
        return base64_decode(strtr($input, '._-', '+/='));
      }
  }
  

  So, my question is that is there an equivalent to getBytes to get the same output example as given above with the salt?

  I am not a Java developer, so please, bear with me.
• get Kik username from phone number programmatically

  I have a list of phone contacts in my android app, I want to open chat with a contact if the user taps on it. I can open profile page of a user with the following code:

    KikClient.getInstance().openProfileForKikUsername(this, "username");
  

  But I can't know the username of a Kik contact. I couldn't find anything helpful on Kik API GitHub page either. Thank you.
• Scrolling edit-disabled textarea

  I am writing simple application that is fetching continously data from some website. The data is stored inside JTextArea. Old data can't get removed from area (requirement). When new data arrives, Console is not scrolling to the bottom. JTextArea has disabled editing. I've tried using things like this:

  DefaultCaret caret = (DefaultCaret)Console.getCaret();
  caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
  

  But it didn't work. I want to avoid adding scrollbars to the window. New data is added to console like so:

  SetContent(GetContent() + data);
  
  /* SetContent and GetContent look like this: */
  protected String GetContent() {
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  protected void SetContent(String s) {
      Console.setText(s);
  }
  

  My question is, how to make this JTextArea scroll to bottom?
• Is it possible to write paint on screen program in java/swing?

  I'm writing paint on screen program using Java Swing. It working on ubuntu linux. But windows shows black screen instead of transparent panel. I included similar example code. What is wrong in my code?

  import javax.swing.*;
  import java.awt.*;
  import java.awt.event.MouseAdapter;
  import java.awt.event.MouseEvent;
  
  public class Example {
  
  public static final Color COLOR_TRANSPARENT = new Color(0,0,0,0);
  
  public Example() {
      Canvas drawArea = new Canvas();
      drawArea.setBackground(COLOR_TRANSPARENT);
      drawArea.setOpaque(true);
  
      JWindow drawingFrame = new JWindow();
      drawingFrame.setBackground(COLOR_TRANSPARENT);
      drawingFrame.setContentPane(drawArea);
      drawingFrame.pack();
      drawingFrame.setSize(640, 460);
      drawingFrame.setVisible(true);
      drawingFrame.setLocationRelativeTo(null);
      drawingFrame.setAlwaysOnTop(true);
  }
  
  public static void main(String[] args){
      SwingUtilities.invokeLater(Example::new);
  }
  
  class Canvas extends JPanel{
  
      private Image image;
      private Graphics2D g2;
  
      public Canvas() {
          super();
          addMouseListener(new MouseAdapter() {
              @Override
              public void mouseClicked(MouseEvent e) {
                  int x = e.getX();
                  int y = e.getY();
                  g2.setPaint(Color.RED);
                  g2.fillOval(x-10, y-10, 20, 20);
                  repaint(x-10, y-10, 20, 20);
              }
          });
      }
  
      @Override
      protected void paintComponent(Graphics g) {
          super.paintComponent(g);
  
          if (image == null){
              image = createImage(getWidth(), getHeight());
              g2 = (Graphics2D) image.getGraphics();
              g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
              g2.setBackground(COLOR_TRANSPARENT);
              clear();
          }
          Graphics2D g2 = (Graphics2D) g;
          g2.drawImage(image, 0,0, null);
      }
  
      public void clear(){
          System.out.println("clearing canvas ");
          g2.setComposite(AlphaComposite.Clear);
          g2.setBackground(COLOR_TRANSPARENT);
          g2.setColor(COLOR_TRANSPARENT);
          g2.fillRect(0, 0, getWidth(), getHeight());
          g2.clearRect(0, 0, getWidth(), getHeight());
          g2.setPaint(Color.RED);
          g2.setComposite(AlphaComposite.SrcOver);
          repaint();
      }
  }
  }
  

  Here is screenshot what I wanted.

  Example code updated. Now code should work without any other additional code.
• Removing added custom cell renderer

  I have created a custom cell renderer to fill a cell by a particular color.

  public class ColorInCellRenderer extends DefaultTableCellRenderer
  
      {
          private final Map<Point, Color> cellColors = new HashMap<Point, Color>();
          public void setCellColor(int row, int column, Color color)
          {
              if (color == null)
              {
                  cellColors.remove(new Point(row, column));
              }
              else
              {
                  cellColors.put(new Point(row, column), color);
              }
          }
  
          private Color getCellColor(int row, int column)
          {
              Color color = cellColors.get(new Point(row, column));
              return color;
          }
  
          public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
          {
              Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
              Color color = getCellColor(row, column);
              c.setBackground(color);
              return c;
          }
      }
  

  i used it in adding a row into jTable as follows.

  private void addTableRow(String type, String name, String rank, String notes, String location, Color color)
      {
          tableModel.addRow(new Object[]
          {
              type,
              name,
              rank,
              notes,
              location
          });
          colorInCellRenderer.setCellColor(tableModel.getRowCount() - 1, INDEX_OF_THE_COLOR_COLUMN, color);
          JTable.repaint();
      }
  

  It works properly and fill the cell correctly. But when I remove the row it does not remove the filled color cell. Instead of it the color column replaces with the color cell in the next row. I tried by repainting the jTable after removing a row. But it does not work.
• Explain the KeyListener in Java

  I am someone new to Java and working with the robot class. I would like to make an emergency stop function for my robot so when it does something wrong I can make the automation end. While robot so far has been easy the key listener escapes me, please explain in a "my first keylistener" style, thank you! Here is what I have so far:

  public static void keyboard(String input, HWND window) throws Exception {
          System.out.println("Keyboard Typing:\n" + input);
          //This is just to stop the error, but I don't know how
          //to actually listen
          KeyEvent e = null;  
          for (int i = 0; i < input.length(); i++) {;
              keepFocus(window);
              if(stopBot(e /*How to pass a key press*/) == true){
                  break;
              }
              char c = input.charAt(i);
              keyboardHandler(c);
              Thread.sleep(80);
          }
      }
  
      public static boolean stopBot(KeyEvent e){
          if(e.getKeyCode() == KeyEvent.VK_END){
              return true;
          }
          return false;
      }
  

  There is other code but this is all that is relevant to my problem
• how to take keyEvent on eclipse platform

  i was making an application for editor on eclipse plugin and using Eclipse PDE with "Hello,World Command" template. The application works, after running the program, it run eclipse platform with sample menu. How to take keylistener when user type on running eclipse platform editor ?
• Why isn't the jnativehook library working in only one program?

  I am currently using the jnativehook2.1.0 library to detect key strokes one my computer globally (in all programs/ without the program having focus). It works in every program on my computer but not in the one I need it to work... The program I want it to work in is the MAlighting onPc Software (A lighting control software). But I can't detect anything when dot2 onPc is focussed. Like I said when I focus for example Spotify or Firefox it cn still detect any keyboard presses...

  Thanks you for your help, SnkeP