как заказать просмотр списка и установить фон?

Question

Во-первых, как поместить последний элемент в списке сверху вверху списка? Может быть приоритет для каждой заметки. Пример номера очереди. И когда я создаю заметку, я хочу выбрать цвет фона заметки для каждой заметки. У каждой заметки свой цвет фона.

Основная деятельность

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mlistViewNotes = findViewById(R.id.main_listview_notes);




}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main,menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.action_main_new_note:
            //start noteaactivity
            Intent newNoteActivity =new Intent(this,NoteActivity.class);
            startActivity(newNoteActivity);
            break;
    }
    return true;
}

@Override
protected void onResume() {
    super.onResume();
    mlistViewNotes.setAdapter(null);
    ArrayList<Note> notes = Utilities.getAllSavedNotes(this);
    if(notes == null || notes.size() == 0){
        Toast.makeText(this, "You have no saved notes",Toast.LENGTH_SHORT).show();
        return;
    }else{
        NoteAdapter na= new NoteAdapter(this, R.layout.item_note,notes);
        mlistViewNotes.setAdapter(na);

        mlistViewNotes.setOnItemClickListener(new AdapterView.OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String fileName =((Note)mlistViewNotes.getItemAtPosition(position)).getmDateTime() + Utilities.FILE_EXTENSION;


                Intent viewNoteIntent= new Intent(getApplicationContext(), NoteActivity.class);
                viewNoteIntent.putExtra("NOTE_FILE",fileName);
                startActivity(viewNoteIntent);
            }
        });
    }


}

Класс примечания

public Note(long mDateTime, String mTitle, String mContent) {
    this.mDateTime = mDateTime;
    this.mTitle = mTitle;
    this.mContent = mContent;
}

public void setmDateTime(long mDateTime) {
    this.mDateTime = mDateTime;
}

public void setmTitle(String mTitle) {
    this.mTitle = mTitle;
}

public void setmContent(String mContent) {
    this.mContent = mContent;
}

public long getmDateTime() {
    return mDateTime;
}

public String getmTitle() {
    return mTitle;
}

public String getmContent() {
    return mContent;
}

public String getDateTimeFormatted(Context context){
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss",context.getResources().getConfiguration().locale);
    sdf.setTimeZone(TimeZone.getDefault());
    return  sdf.format(new Date(mDateTime));
}

NoteActivity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_note);
    mEtTitle = findViewById(R.id.note_et_title);
    mEtContent = findViewById(R.id.note_et_content);
    mNoteFileName = getIntent().getStringExtra("NOTE_FILE");
    if(mNoteFileName != null && !mNoteFileName.isEmpty()){
        mLoadedNote = Utilities.getNoteByName(this,mNoteFileName);

        if(mLoadedNote != null){
            mEtTitle.setText(mLoadedNote.getmTitle());
            mEtContent.setText(mLoadedNote.getmContent());
        }
    }

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_note_new, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.action_note_save:
            saveNote();
        case R.id.action_note_delete:
            deleteNote();
        break;
    }

    return true;
}



private void saveNote(){
    Note note;
    if(mEtTitle.getText().toString().trim().isEmpty() || mEtContent.getText().toString().trim().isEmpty()){
        Toast.makeText(this," Please enter a title and a content",Toast.LENGTH_SHORT).show();
        return;
    }
    if(mLoadedNote == null){
         note =new Note(System.currentTimeMillis(), mEtTitle.getText().toString(),mEtContent.getText().toString());
    }else{
         note =new Note(mLoadedNote.getmDateTime(), mEtTitle.getText().toString(),mEtContent.getText().toString());
    }

    if(Utilities.saveNote(this,note)){
        Toast.makeText(this,"Your note is saved", Toast.LENGTH_SHORT).show();

    }else{
        Toast.makeText(this,"Can not save the note.", Toast.LENGTH_SHORT).show();
    }
    finish();

}
private void deleteNote() {
    if(mLoadedNote == null){
        finish();
    }else{
        AlertDialog.Builder dialog = new AlertDialog.Builder(this).setTitle("Delete").setMessage("You are about to delete " + mEtTitle.getText().toString() + ", are you sure?").setPositiveButton("yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Utilities.deleteNote(getApplicationContext(),mLoadedNote.getmDateTime() + Utilities.FILE_EXTENSION);
                Toast.makeText(getApplicationContext(),mEtTitle.getText().toString() + " is deleted",Toast.LENGTH_SHORT).show();
                finish();
            }
        })
                .setNegativeButton("no",null).setCancelable(false);
        dialog.show();




    }

}

NoteAdapter

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    //return super.getView(position, convertView, parent);
    if(convertView == null){
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_note,null);

    }
    Note note = getItem(position);
    if(note !=null){
        TextView title = convertView.findViewById(R.id.list_note_title);
        TextView date = convertView.findViewById(R.id.list_note_date);
        TextView content = convertView.findViewById(R.id.list_note_content);
        title.setText(note.getmTitle());
        date.setText(note.getDateTimeFormatted(getContext()));
        if(note.getmContent().length() > 50 ){
            content.setText(note.getmContent().substring(0,50));

        }else{
            content.setText(note.getmContent());
        }

    }
    return convertView;

}

Utilies

public static boolean saveNote(Context context, Note note) {
    String fileName = String.valueOf(note.getmDateTime()) + FILE_EXTENSION;
    FileOutputStream fos;
    ObjectOutputStream oos;

    try {
        fos = context.openFileOutput(fileName, context.MODE_PRIVATE);
        oos = new ObjectOutputStream(fos);
        oos.writeObject(note);
        oos.close();
        fos.close();

    } catch (IOException e) {
        e.printStackTrace();
        return false; //tell the user something went wrong.

    }

    return true;
}

public static ArrayList<Note> getAllSavedNotes(Context context) {
    ArrayList<Note> notes = new ArrayList<>();

    File filesDir = context.getFilesDir();
    ArrayList<String> noteFiles = new ArrayList<>();

    for (String file : filesDir.list()) {
        if (file.endsWith(FILE_EXTENSION)) {
            noteFiles.add(file);
        }

    }
    FileInputStream fis;
    ObjectInputStream ois;

    for (int i = 0; i < noteFiles.size(); i++) {
        try {
            fis = context.openFileInput(noteFiles.get(i));
            ois = new ObjectInputStream(fis);
            notes.add((Note) ois.readObject());
            fis.close();
            ois.close();
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
            return null;
        }


    }
    return notes;
}
public static Note getNoteByName(Context context,String fileName){
    File file = new File(context.getFilesDir(), fileName);
    Note note;
    if(file.exists()){
        FileInputStream fis;
        ObjectInputStream ois;
        try{
            fis =context.openFileInput(fileName);
            ois = new ObjectInputStream(fis);
            note = (Note) ois.readObject();
            fis.close();
            ois.close();

        }catch (IOException | ClassNotFoundException e){
            e.printStackTrace();
            return null;
        }
        return note;
    }
    return null;

}
public static void deleteNote(Context context, String fileName){
    File dir = context.getFilesDir();
    File file = new File(dir, fileName);
    if(file.exists()){
        file.delete();
    }

}