Skip to content

Instantly share code, notes, and snippets.

Show Gist options
  • Save jdsingh/aa682127e8e7445a70b5be642eea2413 to your computer and use it in GitHub Desktop.
Save jdsingh/aa682127e8e7445a70b5be642eea2413 to your computer and use it in GitHub Desktop.
Class to easily backup/restore data from Realm.
package org.glucosio.android.tools;
import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.Toast;
import org.glucosio.android.db.DatabaseHandler;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import io.realm.Realm;
public class RealmBackupRestore {
private File EXPORT_REALM_PATH = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
private String EXPORT_REALM_FILE_NAME = "glucosio.realm";
private String IMPORT_REALM_FILE_NAME = "default.realm"; // Eventually replace this if you're using a custom db name
private final static String TAG = RealmBackupRestore.class.getName();
private Activity activity;
private Realm realm;
// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
public RealmBackupRestore(Activity activity) {
this.realm = new DatabaseHandler(activity.getApplicationContext()).getRealmIstance();
this.activity = activity;
}
public void backup() {
// First check if we have storage permissions
checkStoragePermissions(activity);
File exportRealmFile;
Log.d(TAG, "Realm DB Path = " + realm.getPath());
try {
EXPORT_REALM_PATH.mkdirs();
// create a backup file
exportRealmFile = new File(EXPORT_REALM_PATH, EXPORT_REALM_FILE_NAME);
// if backup file already exists, delete it
exportRealmFile.delete();
// copy current realm to backup file
realm.writeCopyTo(exportRealmFile);
} catch (IOException e) {
e.printStackTrace();
}
String msg = "File exported to Path: " + EXPORT_REALM_PATH + "/" + EXPORT_REALM_FILE_NAME;
Toast.makeText(activity.getApplicationContext(), msg, Toast.LENGTH_LONG).show();
Log.d(TAG, msg);
realm.close();
}
public void restore() {
checkStoragePermissions(activity);
//Restore
String restoreFilePath = EXPORT_REALM_PATH + "/" + EXPORT_REALM_FILE_NAME;
Log.d(TAG, "oldFilePath = " + restoreFilePath);
copyBundledRealmFile(restoreFilePath, IMPORT_REALM_FILE_NAME);
Log.d(TAG, "Data restore is done");
}
private String copyBundledRealmFile(String oldFilePath, String outFileName) {
try {
File file = new File(activity.getApplicationContext().getFilesDir(), outFileName);
FileOutputStream outputStream = new FileOutputStream(file);
FileInputStream inputStream = new FileInputStream(new File(oldFilePath));
byte[] buf = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buf)) > 0) {
outputStream.write(buf, 0, bytesRead);
}
outputStream.close();
return file.getAbsolutePath();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private void checkStoragePermissions(Activity activity) {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if(permission != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
private String dbPath(){
return realm.getPath();
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment