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Ich erstelle eine App für Schulprojekte, die Daten aus der Firebase-Datenbank liest, in eine .csv-Datei konvertiert und diese Datei dann in Firebase-Speicher hochladen möchte, damit der Benutzer sie freigeben kann es mit nur der DownloadUrl.Lokales .csv in Firebase-Speicher hochladen
Nachstehend ist die Klasse zum Erstellen einer CSV-Datei und dann Upload in Firebase-Speicher. siehe 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);
}
});
}
}
Die meisten davon sind die Beispiel-Code aus firebase.google.com Aber ich verstehe es nicht zu arbeiten.
Protokolle: E/LOG: Ausgabe von getFilePath: /data/user/0/com.example.eliasvensson.busify/files2016-05-18.csv E/LOG: Die Eingabe von CSVUPLOADER E/LOG: Metadata : [email protected] E/LOG: Nicht erfolgreich in CSVUPLOADER
Was ist falsch? Ich versichere, dass ich den Pfad auf meinem Storage-Bucket "reservieren" und dann die Datei an diesem Ort platzieren. Ist das korrekt?
Jede Hilfe wäre willkommen.