如何在Android中将Excel工作表数据上传到Firebase实时数据库？

Firebase Realtime Database是Google提供的后端服务，用于处理您的Android应用，IOS应用以及您的网站的后端任务。它提供了许多服务，例如存储，数据库等等。 Firebase以其Firebase实时数据库而闻名的功能。通过在您的应用程序中使用Firebase实时数据库，您可以向用户提供实时数据更新，而无需实际刷新您的应用程序。在本文中，我们将Excel工作表数据上传到Firebase实时数据库中。当您创建必须上传很多问题的测验应用程序时，这可能会很有用。在这种情况下，您可以使用Excel工作表上传数据。

我们将在本文中构建什么?

我们将构建一个简单的应用程序，使用excel Sheet将数据上传到Firebase实时数据库中。首先，我们将选择一个excel文件，然后通过获取行和列的总数将其上传到firebase，然后将生成一个随机ID，其中将存储逐行数据。注意，我们将使用Java语言实现该项目。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Java作为编程语言。

步骤2：使用AndroidManifest.xml文件

要将数据添加到Firebase，我们必须授予访问Internet的权限。要添加这些权限，请导航至应用程序> AndroidManifest.xml，然后在该文件内向其添加以下权限。

步骤3：使用build.gradle(app)文件

将这些实现添加到其中

implementation fileTree(dir: ‘libs’, include: [‘*.jar’])

implementation ‘com.google.firebase:firebase-database:16.0.4’

implementation files(‘libs/poi-3.12-android-a.jar’)

步骤4：使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml，然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

步骤5：使用MainActivity。 Java文件

打开MainActivity。该类内有Java文件，首先，创建Button类的对象。

public static final int cellCount=2;
Button excel;

其次，在onCreate()方法内部，我们必须将那些对象与我们在.XML文件中提供的各自的ID进行链接。

excel = findViewById(R.id.excel);

从手机存储中检查对excel文件的许可

if(requestCode == 101){
            if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
                // if permission granted them select file
                selectfile();
            } else {
                Toast.makeText(MainActivity.this, "Permission Not granted",Toast.LENGTH_LONG).show();
       }
 }

从手机中选择Excel文件

Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.setType("*/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        
        // file is selected now start activity function to proceed
        startActivityForResult(Intent.createChooser(intent, "Select File"),102);

获取一个excel工作表并检查行和列的总数，并将这些值添加到数据库中。

XSSFSheet sheet=workbook.getSheetAt(0);
FormulaEvaluator formulaEvaluator=workbook.getCreationHelper().createFormulaEvaluator();
int rowscount=sheet.getPhysicalNumberOfRows();
if(rowscount > 0){                                      
     // check row wise data
     for (int r=0;r

Java

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
  
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
  
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.FirebaseDatabase;
  
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.UUID;
  
public class MainActivity extends AppCompatActivity {
      
    // initialising the cell count as 2
    public static final int cellCount = 2;
    Button excel;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
  
        excel = findViewById(R.id.excel);
          
        // click on excel to select a file
        excel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                    selectfile();
                } else {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 101);
                }
            }
        });
    }
  
    // request for storage permission if not given
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 101) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                selectfile();
            } else {
                Toast.makeText(MainActivity.this, "Permission Not granted", Toast.LENGTH_LONG).show();
            }
        }
    }
  
    private void selectfile() {
        // select the file from the file storage
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.setType("*/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(Intent.createChooser(intent, "Select File"), 102);
    }
  
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 102) {
            if (resultCode == RESULT_OK) {
                String filepath = data.getData().getPath();
                // If excel file then only select the file
                if (filepath.endsWith(".xlsx") || filepath.endsWith(".xls")) {
                    readfile(data.getData());
                }
                // else show the error
                else {
                    Toast.makeText(this, "Please Select an Excel file to upload", Toast.LENGTH_LONG).show();
                }
            }
        }
    }
  
    ProgressDialog dialog;
  
    private void readfile(final Uri file) {
        dialog = new ProgressDialog(this);
        dialog.setMessage("Uploading");
        dialog.setCanceledOnTouchOutside(false);
        dialog.show();
        AsyncTask.execute(new Runnable() {
            @Override
            public void run() {
  
                final HashMap parentmap = new HashMap<>();
  
                try {
                    XSSFWorkbook workbook;
                     
                    // check for the input from the excel file
                    try (InputStream inputStream = getContentResolver().openInputStream(file)) {
                        workbook = new XSSFWorkbook(inputStream);
                    }
                    final String timestamp = "" + System.currentTimeMillis();
                    XSSFSheet sheet = workbook.getSheetAt(0);
                    FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();
                    int rowscount = sheet.getPhysicalNumberOfRows();
                    if (rowscount > 0) {
                        // check row wise data
                        for (int r = 0; r < rowscount; r++) {
                            Row row = sheet.getRow(r);
                            if (row.getPhysicalNumberOfCells() == cellCount) {
                                  
                                // get cell data
                                String A = getCellData(row, 0, formulaEvaluator);
                                String B = getCellData(row, 1, formulaEvaluator);
                                  
                                // initialise the hash map and put value of a and b into it
                                HashMap quetionmap = new HashMap<>();
                                quetionmap.put("A", A);
                                quetionmap.put("B", B);
                                String id = UUID.randomUUID().toString();
                                parentmap.put(id, quetionmap);
                            } else {
                                dialog.dismiss();
                                Toast.makeText(MainActivity.this, "row no. " + (r + 1) + " has incorrect data", Toast.LENGTH_LONG).show();
                                return;
                            }
                        }
                        // add the data in firebase if everything is correct
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                // add the data according to timestamp
                                FirebaseDatabase.getInstance().getReference().child("Data").
                                        child(timestamp).updateChildren(parentmap).addOnCompleteListener(new OnCompleteListener() {
                                    @Override
                                    public void onComplete(@NonNull Task task) {
                                        if (task.isSuccessful()) {
                                            dialog.dismiss();
                                            Toast.makeText(MainActivity.this, "Uploaded Successfully", Toast.LENGTH_LONG).show();
                                        } else {
                                            dialog.dismiss();
                                            Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
                                        }
                                    }
                                });
                            }
                        });
                    }
                    // show the error if file is empty
                    else {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                dialog.dismiss();
                                Toast.makeText(MainActivity.this, "File is empty", Toast.LENGTH_LONG).show();
                            }
                        });
                        return;
                    }
                }
                // show the error message if failed
                // due to file not found
                catch (final FileNotFoundException e) {
                    e.printStackTrace();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
                        }
                    });
                }
                // show the error message if there 
                // is error in input output
                catch (final IOException e) {
                    e.printStackTrace();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
                        }
                    });
                }
            }
        });
    }
  
    private String getCellData(Row row, int cellposition, FormulaEvaluator formulaEvaluator) {
          
        String value = "";
          
        // get cell fom excel sheet
        Cell cell = row.getCell(cellposition);
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_BOOLEAN:
                return value + cell.getBooleanCellValue();
            case Cell.CELL_TYPE_NUMERIC:
                return value + cell.getNumericCellValue();
            case Cell.CELL_TYPE_STRING:
                return value + cell.getStringCellValue();
            default:
                return value;
        }
    }
}

输出：

数据以这种方式保存在数据库中

GitHub链接： https : //github.com/Anni1123/UploadDataExcelSheet