Making a database backup to SDCard on Android

Question

I am using the below code to write a backup copy to SDCard and I get

java.io.IOException: Parent directory of file is not writable: /sdcard/mydbfile.db

private class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> {         private final ProgressDialog dialog = new ProgressDialog(ctx);          // can use UI thread here         protected void onPreExecute() {            this.dialog.setMessage("Exporting database...");            this.dialog.show();         }          // automatically done on worker thread (separate from UI thread)         protected Boolean doInBackground(final String... args) {             File dbFile =                     new File(Environment.getDataDirectory() + "/data/com.mypkg/databases/mydbfile.db");             File exportDir = new File(Environment.getExternalStorageDirectory(), "");            if (!exportDir.exists()) {               exportDir.mkdirs();            }            File file = new File(exportDir, dbFile.getName());             try {               file.createNewFile();               this.copyFile(dbFile, file);               return true;            } catch (IOException e) {               Log.e("mypck", e.getMessage(), e);               return false;            }         }          // can use UI thread here         protected void onPostExecute(final Boolean success) {            if (this.dialog.isShowing()) {               this.dialog.dismiss();            }            if (success) {               Toast.makeText(ctx, "Export successful!", Toast.LENGTH_SHORT).show();            } else {               Toast.makeText(ctx, "Export failed", Toast.LENGTH_SHORT).show();            }         }          void copyFile(File src, File dst) throws IOException {            FileChannel inChannel = new FileInputStream(src).getChannel();            FileChannel outChannel = new FileOutputStream(dst).getChannel();            try {               inChannel.transferTo(0, inChannel.size(), outChannel);            } finally {               if (inChannel != null)                  inChannel.close();               if (outChannel != null)                  outChannel.close();            }         }       } 

Answer 1

Do you have permissions defined in manifest ?

<uses-permission     android:name="android.permission.WRITE_EXTERNAL_STORAGE" />