I have changed the code to test more and found something strange, for some reason my annotation type is changing when I tried to edit, I have even tried with other variable and it's the same
private com.radaee.pdf.Page.Annotation m_annot;
    public static com.radaee.pdf.Page.Annotation m_annot2;
public void OnAnnotClicked(PDFVPage vpage, Page.Annotation annot)
    {
        Log.d("Reader","Annotation Click "+annot);
        m_annot_vpage = vpage;
        if(annot!=null) {
            m_annot = annot;
        }
        if(annot!=null){
                    if (annot.GetType() == 1) {//Popup note
                        m_reader.PDFPerformAnnot();
                    }else{
                        if (annot.GetType() == 3) {//EditText
                            m_annot=annot;
                            m_annot2=annot;
                            Log.d("Reader","Gettype==3 "+m_annot2.GetType());
                            Log.d("Reader","Gettype==3 "+m_annot2.SetEditText("aaa"));
                            onEdit2();
                        }
        }
    }
    private void onEdit2()
    {
        final EditText    input  = new EditText(getActivity());
        final AlertDialog dialog = new AlertDialog.Builder(getActivity())
                .setTitle("Edit Text")
                .setView(input)
                .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        Editable value     = input.getText();
                        String   newValue  = value.toString();
                        Log.d("Reader", "Annot text " + m_annot);
                        Log.d("Reader", "Annot text " + m_annot.GetType());
                        Log.d("Reader", "Annot text " + m_annot.SetEditText(newValue));
                        Log.d("Reader", "Annot text " + m_annot.GetEditText());
                        Log.d("Reader", "Annot text type " + m_annot.GetEditTextFormat());
                        Log.d("Reader", "Annot text " + m_annot2);
                        Log.d("Reader", "Annot text " + m_annot2.GetType());
                        Log.d("Reader", "Annot text " + m_annot2.SetEditText(newValue));
                        Log.d("Reader", "Annot text " + m_annot2.GetEditText());
                        Log.d("Reader", "Annot text type " + m_annot2.GetEditTextFormat());
                        m_reader.PDFEndAnnot();
                        m_reader.updatePage(m_annot_vpage);
                    }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        // Do nothing.
                       m_reader.PDFEndAnnot();
                    }
                })
                .setOnCancelListener(new DialogInterface.OnCancelListener() {
                    @Override
                    public void onCancel(DialogInterface dialogInterface) {
                        m_reader.PDFEndAnnot();
                    }
                }).create();
        input.setText(m_annot.GetEditText());
        input.setSelection(input.getText().length());
        input.setSingleLine(true);
        input.setImeOptions(input.getImeOptions() | EditorInfo.IME_FLAG_NO_EXTRACT_UI);
        dialog.show();
    }
12-10 17:36:44.459 23223-23223/com.radaee.reader D/Reader: Annotation Click com.radaee.pdf.Page$Annotation@42312ea8
12-10 17:36:44.459 23223-23223/com.radaee.reader D/Reader: Gettype==3 3
12-10 17:36:44.839 23223-23223/com.radaee.reader D/Reader: Gettype==3 true
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text com.radaee.pdf.Page$Annotation@42312ea8
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text 0
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text false
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text null
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text type null
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text com.radaee.pdf.Page$Annotation@42312ea8
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text 0
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text false
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text null
12-10 17:36:49.269 23223-23223/com.radaee.reader D/Reader: Annot text type null