Android Запись в существующий Excel и чтение из Excel

Question

Я все еще работаю над приложением сканнера штрих-кода и все еще борюсь с некоторыми проблемами. Пользователь этого приложения может выбрать файл Excel, который он хочет использовать в качестве базы данных, и он может выбрать файл, в который он хочет поместить данные, которые он отсканировал («Штрих-код») и что он напишет («Количество продукта»). Мои проблема в том, что мое приложение не записывает данные в выбранный Excel.

Итак, мои вопросы: 1. Как я могу решить проблему, что мое приложение не записывает данные в выбранный Excel? 2. Как я могу это сделать? -> Когда пользователь отсканировал «Штрих-код», он запускает функцию «ReadDatas» Java, когда отсканированные данные совпадают с «Базой данных», выбирают из той же строки другие данные ячейки столбца и помещают их в диалоговое окно.

Действия сканера Java:

public class ScanActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {

private ZXingScannerView zXingScannerView;
public static String resultt;
public static WriteActivity writeActivity;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //set the main content layout of the Activity
    setContentView(R.layout.activity_barcode_scanner);

    ViewGroup contentFrame = (ViewGroup) findViewById(R.id.content_frame);
    zXingScannerView = new ZXingScannerView(this);
    contentFrame.addView(zXingScannerView);

}

@Override
public void onResume() {
    super.onResume();
    zXingScannerView.setResultHandler(this);
    zXingScannerView.startCamera();
}

@Override
public void onPause() {
    super.onPause();
    zXingScannerView.stopCamera();
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void handleResult(Result rawResult) {
    zXingScannerView.stopCamera();
    Toast.makeText(this, "Contents = " + rawResult.getText() +
            ", Format = " + rawResult.getBarcodeFormat().toString(), Toast.LENGTH_SHORT).show();

    ViewGroup viewGroup = findViewById(android.R.id.content);
    View dialogView = LayoutInflater.from(this).inflate(R.layout.result_dialog, viewGroup, false);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setView(dialogView);
    final AlertDialog dialog = builder.create();
    Objects.requireNonNull(dialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.BLACK));
    TextView myAwesomeTextView = (TextView) dialogView.findViewById(R.id.resultname);
    myAwesomeTextView.setText(rawResult.getText());
    setResultt(rawResult.getText());
    dialog.show();

    Button resultbutton = (Button) dialog.findViewById(R.id.resultbutton);
    resultbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                writeActivity.WritingDatas();
            } catch (IOException e) {
                e.printStackTrace();
            }
            dialog.dismiss();
            zXingScannerView.startCamera();
        }
    });

    // Note:
    // * Wait 2 seconds to resume the preview.
    // * On older devices continuously stopping and resuming camera preview can result in freezing the app.
    // * I don't know why this is the case but I don't have the time to figure out.
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            zXingScannerView.resumeCameraPreview(ScanActivity.this);
        }
    }, 2000);
}


public static void setResultt(String resultt) {
    ScanActivity.resultt = resultt;
}

public static String getResultt() {
    return resultt;
}

}

Второе действие Java

public class SecondActivity extends AppCompatActivity {

public static RelativeLayout relativeLayout;
public static Button buttonsecond;
public static Button opendatabase;
public static Button createnewdatabse;
public static Button openwritabledatabase;
public static String filePath;
public static String createdfilePath;
public static final int REQUEST_CODE = 10;
String[] permissionsall = {
        Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.CAMERA};

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    relativeLayout = findViewById(R.id.activity_second);
    relativeLayout.setBackgroundColor(Color.BLACK);

    if(checkPermission()){

    }else{

    }

    buttonsecond = findViewById(R.id.ScanBarcode);
    buttonsecond.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(SecondActivity.this,ScanActivity.class));
        }
    });

    opendatabase = findViewById(R.id.Opendatabase);
    opendatabase.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            new MaterialFilePicker()
                    .withActivity(SecondActivity.this)
                    .withRequestCode(1000)
                    .start();
        }
    });

    createnewdatabse = findViewById(R.id.Createnewfile);
    createnewdatabse.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onClick(View v) {
            createnewFile();
        }
    });

    openwritabledatabase = findViewById(R.id.Openwritable);
    openwritabledatabase.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            new MaterialFilePicker()
                    .withActivity(SecondActivity.this)
                    .withRequestCode(2000)
                    .start();
        }
    });
}

@Override
protected void onActivityResult(int Requestcode , int Result , Intent data){
    super.onActivityResult(Requestcode,Result,data);

    if(Requestcode == 1000 && Result == RESULT_OK){
     String filePathh = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
     setFilePath(filePathh);
        Toast.makeText(SecondActivity.this, getFilePath(),
                Toast.LENGTH_LONG).show();
    }

    if(Requestcode == 2000 && Result == RESULT_OK){
        String writablepath = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
        setCreatedfilePath(writablepath);
        Toast.makeText(SecondActivity.this, getCreatedfilePath(),
                Toast.LENGTH_LONG).show();
    }

}

public boolean checkPermission(){
    int result;
    List<String> listPermissionisNeed = new ArrayList<>();
        for(String permission : permissionsall ){
            result = ContextCompat.checkSelfPermission(this,permission);
            if(result != PackageManager.PERMISSION_GRANTED){
            listPermissionisNeed.add(permission);
        }
    }
        if (!listPermissionisNeed.isEmpty()){
        ActivityCompat.requestPermissions(this,listPermissionisNeed.toArray(new String[listPermissionisNeed.size()]),REQUEST_CODE);
            return false;
        }
    return true;
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,@NonNull int[] grantResults){
    if(requestCode == REQUEST_CODE){
        HashMap<String, Integer> permissionResults = new HashMap<>();
        int deniedCOunt = 0;
        for(int i=0; i<grantResults.length;i++){
            if(grantResults[i] == PackageManager.PERMISSION_DENIED){
                permissionResults.put(permissions[i],grantResults[i]);
                deniedCOunt++;
            }
        }
        if(deniedCOunt == 0)
        {

        }
        else{
            for(Map.Entry<String, Integer > entry : permissionResults.entrySet())
            {
                String permName = entry.getKey();
                int permResult = entry.getValue();

                if(ActivityCompat.shouldShowRequestPermissionRationale(this,permName)){
                    shownewDialog();
                }else{
                    showsecondDialog();
                }
            }
        }
    }
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void shownewDialog(){

    ViewGroup viewGroup = findViewById(android.R.id.content);
    View dialogView = LayoutInflater.from(this).inflate(R.layout.my_dialog, viewGroup, false);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setView(dialogView);
    final AlertDialog dialog = builder.create();
    Objects.requireNonNull(dialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.BLACK));
    dialog.show();

    Button dialogokbutton = (Button) dialog.findViewById(R.id.buttonOk);
    dialogokbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        dialog.dismiss();
        checkPermission();
        }
    });

    Button dialogcancelbutton = (Button) dialog.findViewById(R.id.buttonCancel);
    dialogcancelbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
            showsecondDialog();
        }
    });
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void showsecondDialog(){
    ViewGroup viewGroup = findViewById(android.R.id.content);
    View dialogView = LayoutInflater.from(this).inflate(R.layout.my_second_dialog, viewGroup, false);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setView(dialogView);
    final AlertDialog dialog = builder.create();
    Objects.requireNonNull(dialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.BLACK));
    dialog.show();

    Button dialogokbutton = (Button) dialog.findViewById(R.id.secondbuttonOk);
    dialogokbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
            Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,Uri.fromParts("package",getPackageName(),null));
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
        }
    });

    Button dialogcancelbutton = (Button) dialog.findViewById(R.id.secondbuttonCancel);
    dialogcancelbutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
            finish();
        }
    });

}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void createnewFile(){
    ViewGroup viewGroup = findViewById(android.R.id.content);
    View dialogView = LayoutInflater.from(this).inflate(R.layout.file_creator, viewGroup, false);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setView(dialogView);
    final AlertDialog dialog = builder.create();
    Objects.requireNonNull(dialog.getWindow()).setBackgroundDrawable(new ColorDrawable(Color.BLACK));
    dialog.show();

    final EditText userInput = (EditText) dialog.findViewById(R.id.filecreatortext);

    Button filecreatebutton = (Button) dialog.findViewById(R.id.filercreatorcreatebutton);
    filecreatebutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Workbook wb=new HSSFWorkbook();
            Cell cell=null;
            CellStyle cellStyle=wb.createCellStyle();
            cellStyle.setFillForegroundColor(HSSFColor.GREEN.index);
            cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

            Sheet sheet=null;
            sheet = wb.createSheet("Products");
            Row row =sheet.createRow(0);

            cell=row.createCell(0);
            cell.setCellValue("Product Name");
            cell.setCellStyle(cellStyle);

            cell=row.createCell(1);
            cell.setCellValue("Barcodenumber");
            cell.setCellStyle(cellStyle);

            cell=row.createCell(2);
            cell.setCellValue("Quantity");
            cell.setCellStyle(cellStyle);

            sheet.setColumnWidth(0,(10*200));
            sheet.setColumnWidth(1,(10*200));
            sheet.setColumnWidth(2,(10*200));

            File file = new File(getExternalFilesDir(null),userInput.getText()+".xls");
            FileOutputStream outputStream =null;

            try {
                outputStream=new FileOutputStream(file);
                wb.write(outputStream);
                Toast.makeText(SecondActivity.this,userInput.getText()+" File Created!",Toast.LENGTH_LONG).show();
            } catch (java.io.IOException e) {
                e.printStackTrace();

                Toast.makeText(SecondActivity.this,"Couldn't create the file!",Toast.LENGTH_LONG).show();
                try {
                    outputStream.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        dialog.dismiss();}
    });
}

public void setFilePath(String filePath){
    this.filePath = filePath;
}

public static String getFilePath(){
    return filePath;
}

public void setCreatedfilePath(String createdfilePath){
    this.createdfilePath = createdfilePath;
}

public static String getCreatedfilePath(){
    return createdfilePath;
}

}

Чтение Java:

public class ReadActivity extends AppCompatActivity {

private static final String LOG_TAG = "";
public static String cellValue;
public static AssetManager assetManager;
public static HSSFWorkbook myWorkBook;
public static HSSFSheet mySheet;
public static HSSFRow myRow;
public static InputStream inputStream;

public void LoadingDatas() throws IOException {

    inputStream = new FileInputStream(SecondActivity.getFilePath());
    myWorkBook = new HSSFWorkbook(inputStream);
    mySheet = myWorkBook.getSheetAt(0);
    Iterator<Row> rowIter = mySheet.rowIterator();
    while (rowIter.hasNext()) {
        myRow = (HSSFRow) rowIter.next();
        Iterator<Cell> cellIter = myRow.cellIterator();
        while (cellIter.hasNext()) {

            HSSFCell myCell = (HSSFCell) cellIter.next();

            if (myCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                cellValue = myCell.getStringCellValue();
            } else {
                cellValue = String.valueOf(myCell.getNumericCellValue());
            }

            Log.v(LOG_TAG, cellValue);
        }
    }

}

}

Запишите Java:

public class WriteActivity extends AppCompatActivity {

public static AssetManager assetManager;
public static HSSFWorkbook myWorkBook;
public static HSSFSheet mySheet;
public static FileInputStream inputStream;

public void WritingDatas() throws IOException {
    //inputStream = new FileInputStream(SecondActivity.getCreatedfilePath());
    File myFile = new File(SecondActivity.getCreatedfilePath());
    inputStream = new FileInputStream(myFile);
    myWorkBook = new HSSFWorkbook(inputStream);
    mySheet = myWorkBook.getSheetAt(0);
    int num = mySheet.getLastRowNum();
    Row row = mySheet.createRow(++num);
    EditText text = (EditText)findViewById(R.id.resultnumber);
    String value = text.getText().toString();
    row.createCell(0).setCellValue(ScanActivity.getResultt());
    row.createCell(1).setCellValue(value);
    FileOutputStream fileOut =new FileOutputStream(myFile);
    myWorkBook.write(fileOut);
    inputStream.close();
    myWorkBook.close();
    fileOut.close();
}

}