Uploading local .csv to Firebase Storage

Question

I'm creating an app for schoolproject that reads data from firebase database, converts it to a .csv file and then I want to upload this file to firebase storage so that the user then can share it with just the downloadUrl.

Below is the class for creating a csvfile and then upload it to firebase storage. see csvUploader.

import android.content.Context;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.util.Log;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.CancellableTask;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.OnProgressListener;
import com.google.firebase.storage.StorageMetadata;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class CsvHandler {

private MainActivity mainActivity;

public CsvHandler(MainActivity mainActivity) {
    this.mainActivity = mainActivity;
}

/**
 * Method that writes a two-dimensional array with strings, to a .csv-file with a specified
 * date as the filename.
 *
 * @param dataArray array to write to a .csv
 * @param callDate  specified date that gets passed to the filename
 */
public void writeFileFromArray(String callDate, String[][] dataArray) {
    String filename = callDate + ".csv";
    //Creates the String which will make up the text for the .csv
    String csvText = "";
    //Adds all elements in Array to the string
    //TODO: Make sure this parses the text correctly to .csv-file format (dependent on Sara & Annies method)
    for (int i = 0; i < dataArray.length; i++) {
        for (int j = 0; j < dataArray[0].length; j++) {
            csvText = csvText + dataArray[i][j];
        }
    }

    //Creates a FileOutputStream for writing the file to internal storage
    FileOutputStream outputStream;
    try {
        //Opens a FileOutputStream to a file with the specified filename.
        //Creates file if it doesn't exist.
        outputStream = mainActivity.openFileOutput(filename, Context.MODE_PRIVATE);
        //Writes the string to the specified file
        outputStream.write(csvText.getBytes());
        //Closes the FileOutputStream to produce a file
        outputStream.close();
    } catch (FileNotFoundException e) {
        Toast.makeText(mainActivity, "Internal Error: No such file found", Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        Toast.makeText(mainActivity, "Internal Error: IOException", Toast.LENGTH_SHORT).show();
    }
}

/**
 * TESTMETOD
 * TODO: Ta bort innan merge med master. Låt stå till develop
 */
public void readCsvFile(String callDate) {
    try {
        String Message;
        FileInputStream fileInputStream = mainActivity.openFileInput(callDate + ".csv");
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        StringBuffer stringBuffer = new StringBuffer();
        while ((Message = bufferedReader.readLine()) != null) {
            stringBuffer.append(Message + "\n");
        }
        Toast.makeText(mainActivity, stringBuffer.toString(), Toast.LENGTH_SHORT).show();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

/**
 * Method to extract a filePath for a specified date.
 *
 * @param callDate a String with the date to return a filepath for
 * @return the filepath for the specified date
 */
public String getFilePath(String callDate) {
    String filePath = mainActivity.getFilesDir().getAbsolutePath() + callDate + ".csv";
    Log.e("LOG", "Output from getFilePath " + filePath);
    return filePath;
}


public void csvUploader(String filePath, final String callDate) {
    StorageReference mStorageReference = FirebaseStorage.getInstance().getReference();
    Log.e("LOG", "Entering CSVUPLOADER");
    Uri file = Uri.fromFile(new File(filePath));
    Log.e("csvUploader Uri File:", filePath.toString());

    // Create the file metadata
    StorageMetadata metadata = new StorageMetadata.Builder().setContentType("text/csv").build();
    Log.e("LOG","Metadata: " + metadata.toString());

    // Upload file and metadata to the path 'reports/date.csv'
    CancellableTask uploadTask = mStorageReference.child("reports/" + file.getLastPathSegment()).putFile(file, metadata);


    uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
            double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
            //System.out.println("Upload is " + progress + "% done");
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception exception) {
            // Handle unsuccessful uploads
            Log.e("LOG", "Unsucessfull in CSVUPLOADER");
        }
    }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
            // Handle successful uploads on complete
            //Uri downloadUrl = taskSnapshot.getMetadata().getDownloadUrl();
            //mainActivity.setDownloadLink(downloadUrl);
            Log.e("LOG", "Successfull in CSVUPLOADER");
            mainActivity.getUrlAsync(callDate);
        }
    });
}

}

Most of this are the example code from firebase.google.com But i don't get it to work.

Logs: E/LOG: Output from getFilePath: /data/user/0/com.example.eliasvensson.busify/files2016-05-18.csv E/LOG: Entering CSVUPLOADER E/LOG: Metadata: com.google.firebase.storage.StorageMetadata@7fd93a9 E/LOG: Unsucessfull in CSVUPLOADER

Whats wrong? I gather that I "reserve" the path on my storage bucket, and then place the file in that place. Is that correct?

Any help would be appreciated.

Answer 1

It all actually almost worked.

the filePath was wrong, outputing /data/user/0/com.example.eliasvensson.busify/files2016-05-18.csv when expecting /data/user/0/com.example.eliasvensson.busify/files/2016-05-18.csv (notice the slash between files and date)