Develop Reference

copy a rar file from assets folder to external card

I am trying to copy two files from assets folder to external storage, one is a text based and another one is a rar file(60 kb). But when i open the rar file in file manager, it says "wrong header". The size of the rar file which i get is 16kb.
private void copyAsset() {
AssetManager assetManager = getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(SKETCH_FILE);
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/Ardumation");
if (!dir.exists()) {
//System.out.println("creating directory: " + directoryName);
dir.mkdir();
}
//File outFile = new File(getExternalFilesDir(null), SKETCH_FILE);
File sketchFile = new File(dir, SKETCH_FILE);
File libraryFile = new File(dir, LIBRARY_FILE);
if (!sketchFile.exists()){
out = new FileOutputStream(sketchFile);
copyFile(in, out);
}
if (!libraryFile.exists()){
out = new FileOutputStream(libraryFile);
copyFile(in, out);
}
} catch(IOException e) {
Log.e(TAG, "Failed to copy asset file: ", e);
}
finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
// NOOP
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
// NOOP
}
}
}
}
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);
}
}
Now what is wrong..?

export of sqlite database in assets folder

I have a sqlite database in my assets folder. I want to export that file. So I do this:
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
//
File direct = new File(Environment.getExternalStorageDirectory()
+ "/Exam Creator");
if (!direct.exists())
{
if (direct.mkdir())
{
// directory is created;
}
}
exportDB();
// importDB();
}
private void exportDB()
{
// TODO Auto-generated method stub
try
{
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite())
{
dbopenhelper.copyDataBase();
String currentDBPath = dbopenhelper.DB_PATH
+ dbopenhelper.DATABASE_NAME;
String backupDBPath = "/BackupFolder/Prayers.db";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getBaseContext(),
backupDB.toString() + "SUCCESS", Toast.LENGTH_LONG)
.show();
}
} catch (Exception e)
{
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
}
to get the path of my currentDB, I first copy the database in my project using this method in my DBOpenHelper and by calling it in export method as you can see above.
public static void copyDataBase()
{
try
{
InputStream input = context.getAssets().open(DATABASE_NAME);
FileOutputStream output = new FileOutputStream(DB_PATH
+ DATABASE_NAME);
byte[] data = new byte[1024];
int buffer;
while ((buffer = input.read(data)) != -1)
{
output.write(data, 0, buffer);
}
output.flush();
output.close();
input.close();
} catch (IOException ex)
{
Log.e(LOGTAG, "Error in copying database...");
}
}
but when I run it, I get Filenotfound exception. I debuged it and saw that after this line:
FileChannel src = new FileInputStream(currentDB).getChannel();
it goes to catch block. Does anyone know what is wrong?
Thanks in advance

copy .db file on sdcard in android

this code does not copy .db file on sdcard while my phone is rooted
try {
String comando = "cp -r /data/data/com.whatsapp/databases/msgstore.db /storage/sdcard0/tmp";
Process suProcess = Runtime.getRuntime().exec("su");
System.out.println(">>>>"
+ Environment.getExternalStorageDirectory());
DataOutputStream os = new DataOutputStream(
suProcess.getOutputStream());
os.writeBytes(comando + "\n");
os.flush();
os.writeBytes("exit\n");
os.flush();
try {
int suProcessRetval = suProcess.waitFor();
if (255 != suProcessRetval) {
//
System.out.println(">>>>> done >>>>");
} else {
//
System.out.println(">>>>> not done >>>>");
}
} catch (Exception ex) {
Log.e("ERROR-->", ex.toString());
}
} catch (Exception e) {
e.printStackTrace();
}

Copy database from /data/data folder to sdcard :
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//com.example.usarmy//databases//usarmy_db.sqlite";
String backupDBPath = "backdatabase.sqlite";
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();
}
}
} catch (Exception e) {
System.out.println("error in data base copy:"+e);
}

Unable to export sqlite DB to sdcard

I have been trying to export my database file into the external memory of my android phone by using
private final String DB_NAME = "MemberData";
private final String TABLE_NAME = "MemberDB";
//Get a reference to the database
File dbFile = this.getDatabasePath(DB_NAME);
//Get a reference to the directory location for the backup
File exportDir = new File(Environment.getExternalStorageDirectory(), "myAppBackups");
if (!exportDir.exists()) {
exportDir.mkdirs();
}
File backup = new File(exportDir, dbFile.getName());
//Check the required operation String command = params[0];
//Attempt file copy
try {
backup.createNewFile();
fileCopy(dbFile, backup);
} catch (IOException e) {
/*Handle File Error*/
}
private void fileCopy(File source, File dest) throws IOException {
FileChannel inChannel = new FileInputStream(source).getChannel();
FileChannel outChannel = new FileOutputStream(dest).getChannel();
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
} finally {
if (inChannel != null) inChannel.close();
if (outChannel != null) outChannel.close();
}
}
It managed to create a directory name "myappsbackup" but my database couldnt be copied over. it is always size 0 and my tables are missing. Is there something wrong with my method of copying?

Here is the code I use to write or backup my SQLite db to the sdcard.
try {
db.open();
File newFile = new File("/sdcard/Your File Name Here");
InputStream input = new FileInputStream(
"/data/data/com.packageNameHere/databases/DB Name Here");
OutputStream output = new FileOutputStream(newFile);
byte[] buffer = new byte[1024];
int length;
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
output.flush();
output.close();
input.close();
db.close();
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

File copy and replacing in /system directory with root permission?

Can anyone kind enough show me how to copy files from my app assets folder to /system folder? I know how to get root access and all. For example: I want to copy file from "/assets/lib/libs.so" and check if this file already exist, if it does replace it to new "/system/lib/libs.so".

try this:
try {
File from = new File( "/assets/lib/libs.so" );
File to = new File( "/system/lib/libs.so" );
if( from.exists() && to.exists() ) {
FileInputStream is = new FileInputStream( from );
FileOutputStream os = new FileOutputStream( to );
FileChannel src = is.getChannel();
FileChannel dst = os.getChannel();
dst.transferFrom( src, 0, src.size() );
src.close();
dst.close();
is.close();
os.close();
}
} catch( Exception e ) {
}

This will check if your file exists, delete it and then copy everthing that is in assets.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
File exists = new File("/system/lib/libs.so");
if(exists.exists()){
exists.delete();
CopyAssets();
}else{
CopyAssets();
}
}
private void CopyAssets() {
AssetManager assetManager = getAssets();
String[] files = null;
try {
files = assetManager.list("");
} catch (IOException e) {
Log.e("tag", e.getMessage());
}
for(String filename : files) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
out = new FileOutputStream("/system/lib/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(Exception e) {
Log.e("tag", e.getMessage());
}
}
}
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);
}
}
Edit:
Declare this permission in your manifest file for filesystems.
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>