I'm trying to copy my existing databases from my Internal to External Storage,but I have a little problem. It says that the file does not exist
. Here is what I'm using actually :
to copy files from internal to external storage :
private void copyFile(String src, String 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();
}
}
and I'm using it like this :
copyFile("/data/data/com.example.test/databases/database.sqlite","/sdcard/.Example/Data/database.sqlite");
but it's not working and I'm pretty sure that the database in internal storage is there.
If I set as a destination folder in copyFile
"/sdcard/.Example/Data/"
it's creating file Data
in .Example
.
Any suggestions what I'm missing?
Use this to copy your database to sdcard.
public void copyFile()
{
try
{
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite())
{
String currentDBPath = "\\data\\your.package.name\\databases\\dabase_name";
String backupDBPath = "database_name";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
if(bool == true)
{
Toast.makeText(Settings.this, "Backup Complete", Toast.LENGTH_SHORT).show();
bool = false;
}
}
}
catch (Exception e) {
Log.w("Settings Backup", e);
}
}
If you don't know your application path then you can use this:
//for without "Resource leak: '<unassigned Closeable value>' is never closed" warning, something like this
public void copyAppDbToDownloadFolder() throws IOException {
try {
String currDate = Constants.APP_DATE_SHORT_FORMAT.format(new Date());
File backupDB = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), DbContract.DATABASE_BUCKUP_NAME + currDate + ".db");
File currentDB = appCon.getDatabasePath(DbContract.DATABASE_NAME);
if (currentDB.exists()) {
FileInputStream fis = new FileInputStream(currentDB);
FileOutputStream fos = new FileOutputStream(backupDB);
fos.getChannel().transferFrom(fis.getChannel(), 0, fis.getChannel().size());
// or fis.getChannel().transferTo(0, fis.getChannel().size(), fos.getChannel());
fis.close();
fos.close();
Log.i("Database successfully", " copied to download folder");
return true;
}
} catch (IOException e) {
Log.d("Copying Database", "fail, reason:", e);
}
}
Or if you need copy database to public "Download" folder then you can use this:
public void copyAppDbToDownloadFolder() throws IOException {
try {
File backupDB = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "toDatabaseName"); // for example "my_data_backup.db"
File currentDB = getApplicationContext().getDatabasePath("databaseName"); //databaseName=your current application database name, for example "my_data.db"
if (currentDB.exists()) {
FileInputStream fis = new FileInputStream(currentDB);
FileOutputStream fos = new FileOutputStream(backupDB);
fos.getChannel().transferFrom(fis.getChannel(), 0, fis.getChannel().size());
// or fis.getChannel().transferTo(0, fis.getChannel().size(), fos.getChannel());
fis.close();
fos.close();
Log.i("Database successfully", " copied to download folder");
return true;
} else Log.i("Copying Database", " fail, database not found");
} catch (IOException e) {
Log.d("Copying Database", "fail, reason:", e);
}
}
This is working perfectly on my Nexus 4 device.
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