Develop Reference

How to restore dump file on android app

I've inserted a lot of data into my android application. Now I want to bundle this data into my app. I only have a database.db file now, how can I restore it to fresh installed app's database?

try this method:
private void importDatabaseFromAssets() {
try {
InputStream myInput = getAssets().open("your_database.db");
String DB_PATH = "/data/data/" + getPackageName() + "/databases/";
String outFileName = DB_PATH + "your_database_name";
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

how can i copy file in data directory

i want to copy file from asset to other application data directory.i have also given root acess to it.but this code doesn't work.its work on extenal storage directory .but not copy file in data directory..
public void onClick(View arg1){
String command[] = { "su", "-c", "ls", "/data" };
Shell shell = new Shell();
String text = shell.sendShellCommand(command);
if (new File((Object)Environment.getDataDirectory() + "/data/com.my/shared_pref/com.myxml").exists()) {
Toast.makeText(getApplicationContext(),"copied",Toast.LENGTH_LONG).show();
MainActivity.this.copyAssets();
}
else{
Toast.makeText(getApplicationContext(),"error! copy failed ",Toast.LENGTH_LONG).show();
private void copyAssets()
{
AssetManager assetManager = getAssets();
String[] files = null;
InputStream in = null;
OutputStream out = null;
String filename =
"com.my.xml" ;
try
{
in = assetManager.open( filename);
out = new FileOutputStream((Environment.getDataDirectory().toString() +"/data/com.my/shared_pref/" + filename));
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
}
catch (IOException e)
{
Log. e ( "tag" , "Failed to copy asset file: " , e);
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException
{
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
out.write(buffer, 0, read);
}
}
if anyone knows how to do it?
Pleaase suggest me.!!
Thanks.!!

This is exactly what you need. This code copies sample.apk from assets to the application data directory. You can change the path to anywhere you want.
private String copyAssets() {
AssetManager assetManager = getActivity().getAssets();
InputStream in = null;
OutputStream out = null;
String filename = "sample.apk";
String path = Environment.getExternalStorageDirectory()
+ "/Android/data/"
+ getActivity().getPackageName()
+ "/files";
try {
in = assetManager.open("files/" + filename);
File outFile = new File(path);
if (!outFile.exists()) {
outFile.mkdirs();
}
out = new FileOutputStream(outFile + "/" + filename);
copyFile(in, out);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
return path + "/" + filename;
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
}

Use this code. I used this code in my project, Got it on net somewhare, it works.
private void copyDataBase() throws IOException
{
//Open your local db as the input stream
InputStream myInput = _context.getAssets().open(DB_NAME);
// Path to db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0)
{
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}

Android - Copying Database from Assets

Here is the code I am using (found in many answers):
InputStream myInput;
try {
myInput = iNezamApplication.getAppContext().getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
} catch (IOException e1) {
e1.printStackTrace();
}
However, I always get an exception after reaching the OutpoutStream line:
java.io.FileNotFoundException: /data/data/package_name/databases/databasename.db: open failed: ENOENT (No such file or directory)

I tried something like this..
final String[] sample_dbName = {"DrugsNew.db"};
int assetDbSize = sample_dbName.length;
File databaseFile = new File( "/data/data/com.handyrep2.ui/databases");
// check if databases folder exists, if not create one and its subfolders
if (!databaseFile.exists()){
databaseFile.mkdir();
}
for(int i=0;i<assetDbSize;i++){
String outFilename =null;
outFilename = "/data/data/com.handyrep2.ui/databases"+ "/" + sample_dbName[i];
File sampleFile = new File(outFilename);
try {
InputStream in = activity.getAssets().open("offlinedb/"+sample_dbName[i]);
OutputStream out = new FileOutputStream(outFilename);
// Transfer bytes from the sample input file to the sample output file
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
out.flush();
// Close the streams
out.close();
in.close();
}catch(IOException e) {
}
}

Is "package_name" a substitute for your real package name just to post it here or do really use this in your DB_PATH? :)

you must create a File object at first

How to copy database file from asset folder to /data/data/<package-name>/database folder

I have put a database file in to assets folder and want to copy it to /data/data//database folder . For this purpose , I have written the following code :
public void copy()
{
try
{
String dest_path = "/data/data/"+getPackageName()+"/database/sultandatabase";
File f = new File(dest_path);
if( !f.exists() )
{
copy_database(getBaseContext().getAssets().open(db_name),new FileOutputStream(dest_path));
}
}
catch(Exception e)
{
Toast.makeText(this,"Sorry the file can not be opended", Toast.LENGTH_LONG).show();
}
}
public void copy_database(InputStream io ,OutputStream ou) throws Exception
{
byte[] buffer = new byte[1024] ;
int lenght;
while( ( lenght = io.read(buffer)) > 0 )
ou.write(buffer);
io.close();
ou.close();
}
When I call copy() the database file is not copied . What is the possible reason ?? How can I fix this ?? Instead a toast is shown up . That means my program gets Exception ?? But why ??

i have this code for copy:
private void copyDataBase()
{
try
{
InputStream myInput = myContext.getAssets().open(DATABASE_NAME);
String outFileName = DATABASE_PATH + DATABASE_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0)
{
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}

SQLiteException when copying/decompressing a zipped DB onto Android

Currently, I am copying a database from my assets folder to the to the /data/data/package folder. This is that code (from the answer here), which works:
public void copyDataBase() throws IOException{
// open db as input stream
InputStream myInput;
//open empty db as output stream
OutputStream myOutPut;
try {
myInput = myContext.getAssets().open(DB_NAME);
//path to newly created db
String outFileName =DB_PATH + DB_NAME;
myOutPut = new FileOutputStream(outFileName);
//transfer bytes from the inputFile to the outPutFile
byte[] buffer = new byte[1024];
int length;
while((length = myInput.read(buffer))>0){
myOutPut.write(buffer, 0, length);
}
myOutPut.flush();
myOutPut.close();
myInput.close();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Now in order to save space in the .apk download, I am trying to zip the file before copying it to the /data/data/package folder.
private void copyDataBaseFromZipFile() {
InputStream inputStream = null;
OutputStream outputStream = null;
String sourcePathname = this.getBundledPathname();
String destinationPath = this.getDatabasePathname();
try {
inputStream = this.mContext.getAssets().open(sourcePathname);
ZipInputStream zipStream = new ZipInputStream(inputStream);
int BUFFER = 8096;
outputStream = new FileOutputStream(destinationPath);
BufferedOutputStream dest = new BufferedOutputStream(outputStream, BUFFER);
ZipEntry entry;
while ((entry = zipStream.getNextEntry()) != null) {
if (entry.getName().equals("androidDB.sql")) }
int count;
byte data[] = new byte[BUFFER];
while ((count = zipStream.read(data, 0, BUFFER)) != -1) {
dest.write(data, 0, count);
}
}
}
outputStream.flush();
outputStream.close();
dest.flush();
dest.close();
zipStream.close();
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
When I attempt to open the database later (with SQLiteDatabse), I get this error: android.database.sqlite.SQLiteException: unable to open database file
I haven't changed anything except the file I'm copy from, which is only a zipped version of the one I was previously copying over. The final database is the right size, so it doesn't seem to be still compressed... If anyone has any suggestions or possible reasons WHY it won't open, it would be greatly appreciated.

You should remove these lines:
outputStream.flush();
outputStream.close();
Your BufferedOutputStream probably has some buffered bytes, but since you close outputStream before you call dest.flush(), those bytes are never actually written to the file.