Develop Reference

Read,Write,Delete Specific text from json file

I am currently developing an application that reads,writes,updates,deletes json file.i have 4 json files namely data.json(to store name,address,area,pin),image.json(to store image name),location.json(to store latitute,longitude) and final.json that merges the above json files.final.json will combine all data from 3 files to make a single record.In a activity I need to read the name,date,time of all records stored in final.json in different radio buttons. I am unable to read only the name,date,time from a record stored in temp.json as temp.json contains latitute,longitude,image name,name,address,pin,area,date,time.Please help me do the following.Also I need to delete only specific record from temp.json file.
This is the code I used to read the text from temp.json.How to read only name,date,time from the file.I am able to read all the parameters
My temp.json looks like
{Record:["latitute":"22.456","longitude":"88.56","image_name":"xyz.jpg","name":"abc","address":"xx","area":""22","pin":"99","date":"03/05/2018" ,"time":"18:08:22"]} {Record:["latitute":"22.456","longitude":"88.56","image_name":"xyz.jpg","name":"abc","address":"xx","area":""22","pin":"99","date":"03/05/2018" ,"time":"18:08:22" ]}
String root = Environment.getExternalStorageDirectory().toString(); //get access to directory path
File myDir = new File(root + "/GeoPark");//create folder in internal storage
myDir.mkdirs();// make directory
File file = new File(myDir, FILENAME);//making a new file in the folder
if(file.exists()) // check if file exist
{
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
}
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Set the text
String x=text.toString();
String z=x.replace("{","").replace("date:","").replace("time:","").replace("Record:","").replace("[","").replace("latitude:","").replace("longitude:","").replace("name:","").replace("address:","").replace("pin:","").replace("area:","").replace("image:","").replace("\"","").replace("]","").replace("}","");
String[] y=z.split(",");
//rb1.setText(y[3].toString()+","+y[7].toString()+","+y[8].toString()+""+"");
// rb2.setText(y[11].toString()+","+y[15].toString()+","+y[16].toString());
//rb3.setText(y[19].toString()+","+y[23].toString()+","+y[24].toString());
//rb4.setText(y[27].toString()+","+y[31].toString()+","+y[32].toString());
}
else
{
rb1.setText("Sorry file doesn't exist!!");
}
///////merge code////
static class CopyFileContent {
public static void main(String[] args) {
JSONObject jsonObj2 = new JSONObject();
try {
// Here we convert Object to JSON
jsonObj2.put("date",a.toString());jsonObj2.put("time",c.toString());// Set the first name/pair
} catch (JSONException ex) {
ex.printStackTrace();
}
String root = Environment.getExternalStorageDirectory().toString(); //get access to directory path
File myDir = new File(root + "/GeoPark");//create folder in internal storage
myDir.mkdirs();// make directory
File destFile = new File(myDir, FILENAME11);//making a new file in the folder
/* Source file, from which content will be copied */
File sourceFile1 = new File(myDir,FILENAME12);
File sourceFile2 = new File(myDir,FILENAME13);
File sourceFile3 = new File(myDir,FILENAME14);
/* destination file, where the content to be pasted */
// File destFile = new File(FILENAME);
/* if file not exist then create one */
if (!destFile.exists()) {
try {
destFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
InputStream input1 = null;
InputStream input2 = null;
InputStream input3 = null;
OutputStream output = null;
InputStream input4=null;
try {
/* FileInputStream to read streams */
input1 = new FileInputStream(sourceFile1);
input2 = new FileInputStream(sourceFile2);
input3 = new FileInputStream(sourceFile3);
/* FileOutputStream to write streams */
output = new FileOutputStream(destFile,true);
byte[] buf = new byte[1024];
int bytesRead;
output.write("{Record:[".getBytes());
while ((bytesRead = input1.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
}
while ((bytesRead = input2.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
}
while ((bytesRead = input3.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
output.write(jsonObj2.toString().getBytes());
output.write("]}".getBytes());
output.write("\r\n".getBytes());
output.write("\r\n".getBytes());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (null != input1) {
input1.close();
}
if (null != input2) {
input2.close();
}
if (null != input3) {
input3.close();
}
if (null != output) {
output.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

Android:How to Copy a Folder From 'assets' Includes files and folders to sdcard [duplicate]

I'm trying to use a directory that I have in my assets folder and access it as a File. Is it possible to access something in the Assets directory as a File? If not, how can I copy a directory from the Assets folder to the application's local directory?
I would copy a file like so:
try
{
InputStream stream = this.getAssets().open("myFile");
OutputStream output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/myNewFile"));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
}
catch(IOException e)
{
e.printStackTrace();
}
However, I'm not sure how I would be able to do this for a directory.
I would rather not build my infrastructure around something that doesn't work, so how would I copy a directory from Assets to a local directory, or is it possible to access a directory in my Assets as a File?
EDIT
This is how I solved it for my own project:
InputStream stream = null;
OutputStream output = null;
for(String fileName : this.getAssets().list("demopass"))
{
stream = this.getAssets().open("directoryName/" + fileName);
output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/newDirectory/" + fileName));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
stream = null;
output = null;
}

As suggested by dmaxi in comment above, you can use his link, with this code:
void displayFiles (AssetManager mgr, String path) {
try {
String list[] = mgr.list(path);
if (list != null)
for (int i=0; i<list.length; ++i)
{
Log.v("Assets:", path +"/"+ list[i]);
displayFiles(mgr, path + "/" + list[i]);
}
} catch (IOException e) {
Log.v("List error:", "can't list" + path);
}
}
I took it on this link.
Maybe you can combine this code with precedent one.
EDIT: see also AssetManager.
private void copyFolder(String name) {
// "Name" is the name of your folder!
AssetManager assetManager = getAssets();
String[] files = null;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
// Checking file on assets subfolder
try {
files = assetManager.list(name);
} catch (IOException e) {
Log.e("ERROR", "Failed to get asset file list.", e);
}
// Analyzing all file on assets subfolder
for(String filename : files) {
InputStream in = null;
OutputStream out = null;
// First: checking if there is already a target folder
File folder = new File(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
// Moving all the files on external SD
try {
in = assetManager.open(name + "/" +filename);
out = new FileOutputStream(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
Log.i("WEBVIEW", Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(IOException e) {
Log.e("ERROR", "Failed to copy asset file: " + filename, e);
} finally {
// Edit 3 (after MMs comment)
in.close();
in = null;
out.flush();
out.close();
out = null;
}
}
else {
// Do something else on failure
}
}
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
} else {
// Something else is wrong. It may be one of many other states, but all we need
// is to know is we can neither read nor write
}
}
// Method used by copyAssets() on purpose to copy a file.
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 2: i'have added an example above: this piece of code copy only a specific folder from assets, to sd card. Let me know if it works!

Here is a recursive function to do this - copyAssetFolder.
public static boolean copyAssetFolder(Context context, String srcName, String dstName) {
try {
boolean result = true;
String fileList[] = context.getAssets().list(srcName);
if (fileList == null) return false;
if (fileList.length == 0) {
result = copyAssetFile(context, srcName, dstName);
} else {
File file = new File(dstName);
result = file.mkdirs();
for (String filename : fileList) {
result &= copyAssetFolder(context, srcName + File.separator + filename, dstName + File.separator + filename);
}
}
return result;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
public static boolean copyAssetFile(Context context, String srcName, String dstName) {
try {
InputStream in = context.getAssets().open(srcName);
File outFile = new File(dstName);
OutputStream out = new FileOutputStream(outFile);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
out.close();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
Or the same in Kotlin
fun AssetManager.copyAssetFolder(srcName: String, dstName: String): Boolean {
return try {
var result = true
val fileList = this.list(srcName) ?: return false
if (fileList.isEmpty()) {
result = copyAssetFile(srcName, dstName)
} else {
val file = File(dstName)
result = file.mkdirs()
for (filename in fileList) {
result = result and copyAssetFolder(
srcName + separator.toString() + filename,
dstName + separator.toString() + filename
)
}
}
result
} catch (e: IOException) {
e.printStackTrace()
false
}
}
fun AssetManager.copyAssetFile(srcName: String, dstName: String): Boolean {
return try {
val inStream = this.open(srcName)
val outFile = File(dstName)
val out: OutputStream = FileOutputStream(outFile)
val buffer = ByteArray(1024)
var read: Int
while (inStream.read(buffer).also { read = it } != -1) {
out.write(buffer, 0, read)
}
inStream.close()
out.close()
true
} catch (e: IOException) {
e.printStackTrace()
false
}
}

You can use following method for copying your asset folder to a location in your SD Card. From your calling method just call moveAssetToStorageDir("") for moving entire asset folder. In case of sub folders you can specify the relative path inside the asset folder.
public void moveAssetToStorageDir(String path){
File file = getExternalFilesDir(null);
String rootPath = file.getPath() + "/" + path;
try{
String [] paths = getAssets().list(path);
for(int i=0; i<paths.length; i++){
if(paths[i].indexOf(".")==-1){
File dir = new File(rootPath + paths[i]);
dir.mkdir();
moveAssetToStorageDir(paths[i]);
}else {
File dest = null;
InputStream in = null;
if(path.length() == 0) {
dest = new File(rootPath + paths[i]);
in = getAssets().open(paths[i]);
}else{
dest = new File(rootPath + "/" + paths[i]);
in = getAssets().open(path + "/" + paths[i]);
}
dest.createNewFile();
FileOutputStream out = new FileOutputStream(dest);
byte [] buff = new byte[in.available()];
in.read(buff);
out.write(buff);
out.close();
in.close();
}
}
}catch (Exception exp){
exp.printStackTrace();
}
}

Here is the clean version of the OP's answer.
public void copyAssetFolderToFolder(Context activity, String assetsFolder, File destinationFolder) {
InputStream stream = null;
OutputStream output = null;
try {
for (String fileName : activity.getAssets().list(assetsFolder)) {
stream = activity.getAssets().open(assetsFolder + ((assetsFolder.endsWith(File.pathSeparator))?"":File.pathSeparator) + fileName);
output = new BufferedOutputStream(new FileOutputStream(new File(destinationFolder, fileName)));
byte data[] = new byte[1024];
int count;
while ((count = stream.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
stream = null;
output = null;
}
} catch (/*any*/Exception e){e.printStackTrace();}
}
For future reference, please save everyone the trouble and post contextually complete source listings. This site can be a great coding resource for beginners and experts, if only you would post complete answers. One cannot assume that anyone else "understands" where a random block of code belongs, or the context that the code is supposed to be executed within.
This sample calls for the context of an activity, which houses the getAssets() method. Within the android platform, their are other classes besides Activity which can supply this context. One example is the (generic reference) Service class.

Moving an arbitrary folder of directories and files from Assets
The thing is... Assets are special. You cannot wrap it in a File object and ask isDirectory() and you cannot pass these assets into the NDK. So it is better to wrap them up and move them to a cache directory or onto the SDCard which is why you're here.
I've seen many SO answers that involve some version of rolling through an array of fileOrDirectoryName strings and then creating directories followed by a recursive call and copying individual files. Which leads you to create a folder or file and you cannot tell from an asset which you have.
Make it a Zip file
My recommendation is to take each arbitrary collection of assets that you want to ship to the SDCard or an internal cache folder and Zip it up. The problem is structured in an way more compatible with the Assets concept.
AssetManager assetManager = context.getAssets();
String fullAssetPath = fromAssetPath + "/" + zipFilename;
String toPath = "/wherever/I/want";
try {
InputStream inputStream = assetManager.open(fullAssetPath);
ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(inputStream));
ZipEntry zipEntry;
byte[] buffer = new byte[8192];
while ((zipEntry = zipInputStream.getNextEntry()) != null) {
String fileOrDirectory = zipEntry.getName();
Uri.Builder builder = new Uri.Builder();
builder.scheme("file");
builder.appendPath(toPath);
builder.appendPath(fileOrDirectory);
String fullToPath = builder.build().getPath();
if (zipEntry.isDirectory()) {
File directory = new File(fullToPath);
directory.mkdirs();
continue;
}
FileOutputStream fileOutputStream = new FileOutputStream(fullToPath);
while ((count = zipInputStream.read(buffer)) != -1) {
fileOutputStream.write(buffer, 0, count);
}
fileOutputStream.close();
zipInputStream.closeEntry();
}
zipInputStream.close();
} catch (IOException e) {
Log.e(TAG, e.getLocalizedMessage());
}
Small note about buffer sizes
I've seen a lot of examples involving very small buffer sizes, for example 1024. Unless you just want to waste time feel free to try larger byte buffer sizes. Even my choice of 8192 is probably small on modern hardware.
Avoiding Stringy paths
Notice the use of Uri.Builder to construct the path. I much prefer this style of path construction over directory + "/" + file. Then you're in the business, for the sake of consistency avoiding assigning String d = "myDirectory/" or String f = "/file.txt" and other such string hacking nonsense.

Here's a recursive solution written in kotlin. It works with both files and dirs.
Usage - copyAssetDir(context, "<asset path>", "<dest dir>")
import android.content.Context
import java.io.File
import java.io.FileOutputStream
fun copyAssetDir(context: Context, assetPath: String, destDirPath: String) {
walkAssetDir(context, assetPath) {
copyAssetFile(context, it, "$destDirPath/$it")
}
}
fun walkAssetDir(context: Context, assetPath: String, callback: ((String) -> Unit)) {
val children = context.assets.list(assetPath) ?: return
if (children.isEmpty()) {
callback(assetPath)
} else {
for (child in children) {
walkAssetDir(context, "$assetPath/$child", callback)
}
}
}
fun copyAssetFile(context: Context, assetPath: String, destPath: String): File {
val destFile = File(destPath)
File(destFile.parent).mkdirs()
destFile.createNewFile()
context.assets.open(assetPath).use { src ->
FileOutputStream(destFile).use { dest ->
src.copyTo(dest)
}
}
return destFile
}

This is code for copy assets folder with directory and files both copy into sdcard folder...
this one works perfectly for me...
public void copyFileOrDir(String path) {
AssetManager assetManager = this.getAssets();
String assets[] = null;
try {
assets = assetManager.list(path);
if (assets.length == 0) {
copyFile(path);
} else {
String fullPath = "/data/data/" + this.getPackageName() + "/" + path;
File dir = new File(fullPath);
if (!dir.exists())
dir.mkdir();
for (int i = 0; i < assets.length; ++i) {
copyFileOrDir(path + "/" + assets[i]);
}
}
} catch (IOException ex) {
Log.e("tag", "I/O Exception", ex);
}
}
private void copyFile(String filename) {
AssetManager assetManager = this.getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
String newFileName = "/data/data/" + this.getPackageName() + "/" + filename;
out = new FileOutputStream(newFileName);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
}

How to copy a file to another directory programmatically?

There is an image file inside a directory. How to copy this image file into another directory that was just created ? The two directories are on the same internal storage of the device :)

You can use these functions. The first one will copy whole directory with all children or a single file if you pass in a file. The second one is only usefull for files and is called for each file in the first one.
Also note you need to have permissions to do that
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Functions:
public static void copyFileOrDirectory(String srcDir, String dstDir) {
try {
File src = new File(srcDir);
File dst = new File(dstDir, src.getName());
if (src.isDirectory()) {
String files[] = src.list();
int filesLength = files.length;
for (int i = 0; i < filesLength; i++) {
String src1 = (new File(src, files[i]).getPath());
String dst1 = dst.getPath();
copyFileOrDirectory(src1, dst1);
}
} else {
copyFile(src, dst);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void copyFile(File sourceFile, File destFile) throws IOException {
if (!destFile.getParentFile().exists())
destFile.getParentFile().mkdirs();
if (!destFile.exists()) {
destFile.createNewFile();
}
FileChannel source = null;
FileChannel destination = null;
try {
source = new FileInputStream(sourceFile).getChannel();
destination = new FileOutputStream(destFile).getChannel();
destination.transferFrom(source, 0, source.size());
} finally {
if (source != null) {
source.close();
}
if (destination != null) {
destination.close();
}
}
}

If you want to copy image programtically then use following code.
File sourceLocation= new File (sourcepath);
File targetLocation= new File (targetpath);
InputStream in = new FileInputStream(sourceLocation);
OutputStream out = new FileOutputStream(targetLocation);
// Copy the bits from instream to outstream
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();

** Use FileUtils This Is Simple Fast And Best method and Download Jar file from here**
public void MoveFiles(String sourcepath) {
File source_f = new File(sourcepath);
String destinationPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/WhatsappStatus/yourfilename.mp4";
File destination = new File(destinationPath);
try
{
FileUtils.copyFile(source_f , destination);
}
catch (IOException e)
{
e.printStackTrace();
}
}
Go To Link For FileUtils Jar

Copy directory from Assets to local directory

I'm trying to use a directory that I have in my assets folder and access it as a File. Is it possible to access something in the Assets directory as a File? If not, how can I copy a directory from the Assets folder to the application's local directory?
I would copy a file like so:
try
{
InputStream stream = this.getAssets().open("myFile");
OutputStream output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/myNewFile"));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
}
catch(IOException e)
{
e.printStackTrace();
}
However, I'm not sure how I would be able to do this for a directory.
I would rather not build my infrastructure around something that doesn't work, so how would I copy a directory from Assets to a local directory, or is it possible to access a directory in my Assets as a File?
EDIT
This is how I solved it for my own project:
InputStream stream = null;
OutputStream output = null;
for(String fileName : this.getAssets().list("demopass"))
{
stream = this.getAssets().open("directoryName/" + fileName);
output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/newDirectory/" + fileName));
byte data[] = new byte[1024];
int count;
while((count = stream.read(data)) != -1)
{
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
stream = null;
output = null;
}

As suggested by dmaxi in comment above, you can use his link, with this code:
void displayFiles (AssetManager mgr, String path) {
try {
String list[] = mgr.list(path);
if (list != null)
for (int i=0; i<list.length; ++i)
{
Log.v("Assets:", path +"/"+ list[i]);
displayFiles(mgr, path + "/" + list[i]);
}
} catch (IOException e) {
Log.v("List error:", "can't list" + path);
}
}
I took it on this link.
Maybe you can combine this code with precedent one.
EDIT: see also AssetManager.
private void copyFolder(String name) {
// "Name" is the name of your folder!
AssetManager assetManager = getAssets();
String[] files = null;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
// Checking file on assets subfolder
try {
files = assetManager.list(name);
} catch (IOException e) {
Log.e("ERROR", "Failed to get asset file list.", e);
}
// Analyzing all file on assets subfolder
for(String filename : files) {
InputStream in = null;
OutputStream out = null;
// First: checking if there is already a target folder
File folder = new File(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdir();
}
if (success) {
// Moving all the files on external SD
try {
in = assetManager.open(name + "/" +filename);
out = new FileOutputStream(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
Log.i("WEBVIEW", Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(IOException e) {
Log.e("ERROR", "Failed to copy asset file: " + filename, e);
} finally {
// Edit 3 (after MMs comment)
in.close();
in = null;
out.flush();
out.close();
out = null;
}
}
else {
// Do something else on failure
}
}
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
} else {
// Something else is wrong. It may be one of many other states, but all we need
// is to know is we can neither read nor write
}
}
// Method used by copyAssets() on purpose to copy a file.
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 2: i'have added an example above: this piece of code copy only a specific folder from assets, to sd card. Let me know if it works!

Here is a recursive function to do this - copyAssetFolder.
public static boolean copyAssetFolder(Context context, String srcName, String dstName) {
try {
boolean result = true;
String fileList[] = context.getAssets().list(srcName);
if (fileList == null) return false;
if (fileList.length == 0) {
result = copyAssetFile(context, srcName, dstName);
} else {
File file = new File(dstName);
result = file.mkdirs();
for (String filename : fileList) {
result &= copyAssetFolder(context, srcName + File.separator + filename, dstName + File.separator + filename);
}
}
return result;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
public static boolean copyAssetFile(Context context, String srcName, String dstName) {
try {
InputStream in = context.getAssets().open(srcName);
File outFile = new File(dstName);
OutputStream out = new FileOutputStream(outFile);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
out.close();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
Or the same in Kotlin
fun AssetManager.copyAssetFolder(srcName: String, dstName: String): Boolean {
return try {
var result = true
val fileList = this.list(srcName) ?: return false
if (fileList.isEmpty()) {
result = copyAssetFile(srcName, dstName)
} else {
val file = File(dstName)
result = file.mkdirs()
for (filename in fileList) {
result = result and copyAssetFolder(
srcName + separator.toString() + filename,
dstName + separator.toString() + filename
)
}
}
result
} catch (e: IOException) {
e.printStackTrace()
false
}
}
fun AssetManager.copyAssetFile(srcName: String, dstName: String): Boolean {
return try {
val inStream = this.open(srcName)
val outFile = File(dstName)
val out: OutputStream = FileOutputStream(outFile)
val buffer = ByteArray(1024)
var read: Int
while (inStream.read(buffer).also { read = it } != -1) {
out.write(buffer, 0, read)
}
inStream.close()
out.close()
true
} catch (e: IOException) {
e.printStackTrace()
false
}
}

You can use following method for copying your asset folder to a location in your SD Card. From your calling method just call moveAssetToStorageDir("") for moving entire asset folder. In case of sub folders you can specify the relative path inside the asset folder.
public void moveAssetToStorageDir(String path){
File file = getExternalFilesDir(null);
String rootPath = file.getPath() + "/" + path;
try{
String [] paths = getAssets().list(path);
for(int i=0; i<paths.length; i++){
if(paths[i].indexOf(".")==-1){
File dir = new File(rootPath + paths[i]);
dir.mkdir();
moveAssetToStorageDir(paths[i]);
}else {
File dest = null;
InputStream in = null;
if(path.length() == 0) {
dest = new File(rootPath + paths[i]);
in = getAssets().open(paths[i]);
}else{
dest = new File(rootPath + "/" + paths[i]);
in = getAssets().open(path + "/" + paths[i]);
}
dest.createNewFile();
FileOutputStream out = new FileOutputStream(dest);
byte [] buff = new byte[in.available()];
in.read(buff);
out.write(buff);
out.close();
in.close();
}
}
}catch (Exception exp){
exp.printStackTrace();
}
}

Here is the clean version of the OP's answer.
public void copyAssetFolderToFolder(Context activity, String assetsFolder, File destinationFolder) {
InputStream stream = null;
OutputStream output = null;
try {
for (String fileName : activity.getAssets().list(assetsFolder)) {
stream = activity.getAssets().open(assetsFolder + ((assetsFolder.endsWith(File.pathSeparator))?"":File.pathSeparator) + fileName);
output = new BufferedOutputStream(new FileOutputStream(new File(destinationFolder, fileName)));
byte data[] = new byte[1024];
int count;
while ((count = stream.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
stream.close();
stream = null;
output = null;
}
} catch (/*any*/Exception e){e.printStackTrace();}
}
For future reference, please save everyone the trouble and post contextually complete source listings. This site can be a great coding resource for beginners and experts, if only you would post complete answers. One cannot assume that anyone else "understands" where a random block of code belongs, or the context that the code is supposed to be executed within.
This sample calls for the context of an activity, which houses the getAssets() method. Within the android platform, their are other classes besides Activity which can supply this context. One example is the (generic reference) Service class.

Moving an arbitrary folder of directories and files from Assets
The thing is... Assets are special. You cannot wrap it in a File object and ask isDirectory() and you cannot pass these assets into the NDK. So it is better to wrap them up and move them to a cache directory or onto the SDCard which is why you're here.
I've seen many SO answers that involve some version of rolling through an array of fileOrDirectoryName strings and then creating directories followed by a recursive call and copying individual files. Which leads you to create a folder or file and you cannot tell from an asset which you have.
Make it a Zip file
My recommendation is to take each arbitrary collection of assets that you want to ship to the SDCard or an internal cache folder and Zip it up. The problem is structured in an way more compatible with the Assets concept.
AssetManager assetManager = context.getAssets();
String fullAssetPath = fromAssetPath + "/" + zipFilename;
String toPath = "/wherever/I/want";
try {
InputStream inputStream = assetManager.open(fullAssetPath);
ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(inputStream));
ZipEntry zipEntry;
byte[] buffer = new byte[8192];
while ((zipEntry = zipInputStream.getNextEntry()) != null) {
String fileOrDirectory = zipEntry.getName();
Uri.Builder builder = new Uri.Builder();
builder.scheme("file");
builder.appendPath(toPath);
builder.appendPath(fileOrDirectory);
String fullToPath = builder.build().getPath();
if (zipEntry.isDirectory()) {
File directory = new File(fullToPath);
directory.mkdirs();
continue;
}
FileOutputStream fileOutputStream = new FileOutputStream(fullToPath);
while ((count = zipInputStream.read(buffer)) != -1) {
fileOutputStream.write(buffer, 0, count);
}
fileOutputStream.close();
zipInputStream.closeEntry();
}
zipInputStream.close();
} catch (IOException e) {
Log.e(TAG, e.getLocalizedMessage());
}
Small note about buffer sizes
I've seen a lot of examples involving very small buffer sizes, for example 1024. Unless you just want to waste time feel free to try larger byte buffer sizes. Even my choice of 8192 is probably small on modern hardware.
Avoiding Stringy paths
Notice the use of Uri.Builder to construct the path. I much prefer this style of path construction over directory + "/" + file. Then you're in the business, for the sake of consistency avoiding assigning String d = "myDirectory/" or String f = "/file.txt" and other such string hacking nonsense.

Here's a recursive solution written in kotlin. It works with both files and dirs.
Usage - copyAssetDir(context, "<asset path>", "<dest dir>")
import android.content.Context
import java.io.File
import java.io.FileOutputStream
fun copyAssetDir(context: Context, assetPath: String, destDirPath: String) {
walkAssetDir(context, assetPath) {
copyAssetFile(context, it, "$destDirPath/$it")
}
}
fun walkAssetDir(context: Context, assetPath: String, callback: ((String) -> Unit)) {
val children = context.assets.list(assetPath) ?: return
if (children.isEmpty()) {
callback(assetPath)
} else {
for (child in children) {
walkAssetDir(context, "$assetPath/$child", callback)
}
}
}
fun copyAssetFile(context: Context, assetPath: String, destPath: String): File {
val destFile = File(destPath)
File(destFile.parent).mkdirs()
destFile.createNewFile()
context.assets.open(assetPath).use { src ->
FileOutputStream(destFile).use { dest ->
src.copyTo(dest)
}
}
return destFile
}

This is code for copy assets folder with directory and files both copy into sdcard folder...
this one works perfectly for me...
public void copyFileOrDir(String path) {
AssetManager assetManager = this.getAssets();
String assets[] = null;
try {
assets = assetManager.list(path);
if (assets.length == 0) {
copyFile(path);
} else {
String fullPath = "/data/data/" + this.getPackageName() + "/" + path;
File dir = new File(fullPath);
if (!dir.exists())
dir.mkdir();
for (int i = 0; i < assets.length; ++i) {
copyFileOrDir(path + "/" + assets[i]);
}
}
} catch (IOException ex) {
Log.e("tag", "I/O Exception", ex);
}
}
private void copyFile(String filename) {
AssetManager assetManager = this.getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
String newFileName = "/data/data/" + this.getPackageName() + "/" + filename;
out = new FileOutputStream(newFileName);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
}

zip/compress a folder full of files on android

I need to zip up a "project" folder to allow users to share projects via email. I found a class for zipping up multiple files into one zip, but I need to keep the folder structure in my zip. Is there any way to achieve this on android? Thanks in advance.

This code should do the trick.
Note: you must add file write permissions to your app by adding the WRITE_EXTERNAL_STORAGE permission to your manifest.xml file.
/*
*
* Zips a file at a location and places the resulting zip file at the toLocation
* Example: zipFileAtPath("downloads/myfolder", "downloads/myFolder.zip");
*/
public boolean zipFileAtPath(String sourcePath, String toLocation) {
final int BUFFER = 2048;
File sourceFile = new File(sourcePath);
try {
BufferedInputStream origin = null;
FileOutputStream dest = new FileOutputStream(toLocation);
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(
dest));
if (sourceFile.isDirectory()) {
zipSubFolder(out, sourceFile, sourceFile.getParent().length());
} else {
byte data[] = new byte[BUFFER];
FileInputStream fi = new FileInputStream(sourcePath);
origin = new BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(getLastPathComponent(sourcePath));
entry.setTime(sourceFile.lastModified()); // to keep modification time after unzipping
out.putNextEntry(entry);
int count;
while ((count = origin.read(data, 0, BUFFER)) != -1) {
out.write(data, 0, count);
}
}
out.close();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
/*
*
* Zips a subfolder
*
*/
private void zipSubFolder(ZipOutputStream out, File folder,
int basePathLength) throws IOException {
final int BUFFER = 2048;
File[] fileList = folder.listFiles();
BufferedInputStream origin = null;
for (File file : fileList) {
if (file.isDirectory()) {
zipSubFolder(out, file, basePathLength);
} else {
byte data[] = new byte[BUFFER];
String unmodifiedFilePath = file.getPath();
String relativePath = unmodifiedFilePath
.substring(basePathLength);
FileInputStream fi = new FileInputStream(unmodifiedFilePath);
origin = new BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(relativePath);
entry.setTime(file.lastModified()); // to keep modification time after unzipping
out.putNextEntry(entry);
int count;
while ((count = origin.read(data, 0, BUFFER)) != -1) {
out.write(data, 0, count);
}
origin.close();
}
}
}
/*
* gets the last path component
*
* Example: getLastPathComponent("downloads/example/fileToZip");
* Result: "fileToZip"
*/
public String getLastPathComponent(String filePath) {
String[] segments = filePath.split("/");
if (segments.length == 0)
return "";
String lastPathComponent = segments[segments.length - 1];
return lastPathComponent;
}

this is how I do it:
private static void zipFolder(String inputFolderPath, String outZipPath) {
try {
FileOutputStream fos = new FileOutputStream(outZipPath);
ZipOutputStream zos = new ZipOutputStream(fos);
File srcFile = new File(inputFolderPath);
File[] files = srcFile.listFiles();
Log.d("", "Zip directory: " + srcFile.getName());
for (int i = 0; i < files.length; i++) {
Log.d("", "Adding file: " + files[i].getName());
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(files[i]);
zos.putNextEntry(new ZipEntry(files[i].getName()));
int length;
while ((length = fis.read(buffer)) > 0) {
zos.write(buffer, 0, length);
}
zos.closeEntry();
fis.close();
}
zos.close();
} catch (IOException ioe) {
Log.e("", ioe.getMessage());
}
}

I have reworked the code from HailZeon to work properly under windows. Zip Entries must be closed before new ones are started and a starting "/" at entry names like "/file.txt" makes also problems
/**
* Zips a Folder to "[Folder].zip"
* #param toZipFolder Folder to be zipped
* #return the resulting ZipFile
*/
public static File zipFolder(File toZipFolder) {
File ZipFile = new File(toZipFolder.getParent(), format("%s.zip", toZipFolder.getName()));
try {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(ZipFile));
zipSubFolder(out, toZipFolder, toZipFolder.getPath().length());
out.close();
return ZipFile;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
/**
* Main zip Function
* #param out Target ZipStream
* #param folder Folder to be zipped
* #param basePathLength Length of original Folder Path (for recursion)
*/
private static void zipSubFolder(ZipOutputStream out, File folder, int basePathLength) throws IOException {
final int BUFFER = 2048;
File[] fileList = folder.listFiles();
BufferedInputStream origin = null;
for (File file : fileList) {
if (file.isDirectory()) {
zipSubFolder(out, file, basePathLength);
} else {
byte data[] = new byte[BUFFER];
String unmodifiedFilePath = file.getPath();
String relativePath = unmodifiedFilePath.substring(basePathLength + 1);
FileInputStream fi = new FileInputStream(unmodifiedFilePath);
origin = new BufferedInputStream(fi, BUFFER);
ZipEntry entry = new ZipEntry(relativePath);
entry.setTime(file.lastModified()); // to keep modification time after unzipping
out.putNextEntry(entry);
int count;
while ((count = origin.read(data, 0, BUFFER)) != -1) {
out.write(data, 0, count);
}
origin.close();
out.closeEntry();
}
}
}

Use the zip4j library from this location. Import the jar file to your "app/libs/" folder. And use the following code to zip your directories/files...
try {
File input = new File("path/to/your/input/fileOrFolder");
String destinationPath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "zippedItem.zip";
ZipParameters parameters = new ZipParameters();
parameters.setCompressionMethod(Zip4jConstants.COMP_STORE);
parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
File output = new File(destinationPath);
ZipFile zipFile = new ZipFile(output);
// .addFolder or .addFile depending on your input
if (sourceFile.isDirectory())
zipFile.addFolder(input, parameters);
else
zipFile.addFile(input, parameters);
// Your input file/directory has been zipped at this point and you
// can access it as a normal file using the following line of code
File zippedFile = zipFile.getFile();
} catch (ZipException e) {
Log.e(TAG, Log.getStackTraceString(e));
}

If you use a java.util.zip object then you can write a script that does not modify the directory structure.

public static boolean zip(File sourceFile, File zipFile) {
List<File> fileList = getSubFiles(sourceFile, true);
ZipOutputStream zipOutputStream = null;
try {
zipOutputStream = new ZipOutputStream(new FileOutputStream(zipFile));
int bufferSize = 1024;
byte[] buf = new byte[bufferSize];
ZipEntry zipEntry;
for(int i = 0; i < fileList.size(); i++) {
File file = fileList.get(i);
zipEntry = new ZipEntry(sourceFile.toURI().relativize(file.toURI()).getPath());
zipOutputStream.putNextEntry(zipEntry);
if (!file.isDirectory()) {
InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
int readLength;
while ((readLength = inputStream.read(buf, 0, bufferSize)) != -1) {
zipOutputStream.write(buf, 0, readLength);
}
}
}
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
IoUtils.closeOS(zipOutputStream);
}
return true;
}
public static List<File> getSubFiles(File baseDir, boolean isContainFolder) {
List<File> fileList = new ArrayList<>();
File[] tmpList = baseDir.listFiles();
for (File file : tmpList) {
if (file.isFile()) {
fileList.add(file);
}
if (file.isDirectory()) {
if (isContainFolder) {
fileList.add(file); //key code
}
fileList.addAll(getSubFiles(file));
}
}
return fileList;
}

Just converting #HailZeon's answer to Kotlin:
import java.io.BufferedInputStream
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.io.IOException
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream
import java.util.zip.ZipException
private const val BUFFER = 2048
/**
* Compresses a file into a zip file
* #author Arnau Mora
* #since 20210318
* #param file The source file
* #param target The target file
*
* #throws NullPointerException If the entry name is null
* #throws IllegalArgumentException If the entry name is longer than 0xFFFF byte
* #throws SecurityException If a security manager exists and its SecurityManager.checkRead(String)
* method denies read access to the file
* #throws ZipException If a ZIP format error has occurred
* #throws IOException If an I/O error has occurre
*/
#Throws(
NullPointerException::class,
IllegalArgumentException::class,
SecurityException::class,
ZipException::class,
IOException::class
)
fun zipFile(file: File, target: File) {
val origin: BufferedInputStream
val dest: FileOutputStream
var zipOutput: ZipOutputStream? = null
try {
dest = target.outputStream()
zipOutput = ZipOutputStream(dest.buffered(BUFFER))
if (file.isDirectory)
zipSubFolder(zipOutput, file, file.parent!!.length)
else {
val data = ByteArray(BUFFER)
val fi = file.inputStream()
origin = fi.buffered(BUFFER)
val entry = ZipEntry(getLastPathComponent(file.path))
entry.time = file.lastModified()
zipOutput.putNextEntry(entry)
var count = origin.read(data, 0, BUFFER)
while (count != -1) {
zipOutput.write(data, 0, count)
count = origin.read(data, 0, BUFFER)
}
}
} finally {
zipOutput?.close()
}
}
private fun zipSubFolder(zipOutput: ZipOutputStream, folder: File, basePathLength: Int) {
val files = folder.listFiles() ?: return
var origin: BufferedInputStream? = null
try {
for (file in files) {
if (file.isDirectory)
zipSubFolder(zipOutput, folder, basePathLength)
else {
val data = ByteArray(BUFFER)
val unmodifiedFilePath = file.path
val relativePath = unmodifiedFilePath.substring(basePathLength)
val fi = FileInputStream(unmodifiedFilePath)
origin = fi.buffered(BUFFER)
val entry = ZipEntry(relativePath)
entry.time = file.lastModified()
zipOutput.putNextEntry(entry)
var count = origin.read(data, 0, BUFFER)
while (count != -1) {
zipOutput.write(data, 0, count)
count = origin.read(data, 0, BUFFER)
}
}
}
} finally {
origin?.close()
}
}
/*
* gets the last path component
*
* Example: getLastPathComponent("downloads/example/fileToZip");
* Result: "fileToZip"
*/
private fun getLastPathComponent(filePath: String): String {
val segments = filePath.split("/").toTypedArray()
return if (segments.isEmpty()) "" else segments[segments.size - 1]
}

If someone comes here trying to find a java8 cleaner refactored version of the #HailZeon code. Here it is:
private static final int BUFFER_SIZE = 2048;
public File zip(File source, String zipFileName) throws IOException {
File zipFile = null;
if(source != null) {
File zipFileDestination = new File(getCacheDir(), zipFileName);
if (zipFileDestination.exists()) {
zipFileDestination.delete();
}
zipFile = zip(source, zipFileDestination);
}
return zipFile;
}
public File zip(File source, File zipFile) throws IOException {
int relativeStartingPathIndex = zipFile.getAbsolutePath().lastIndexOf("/") + 1;
if (source != null && zipFile != null) {
try (ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream( new FileOutputStream(zipFile)))) {
if (source.isDirectory()) {
zipSubDir(out, source, relativeStartingPathIndex);
} else {
try (BufferedInputStream origin = new BufferedInputStream(new FileInputStream(source))) {
zipEntryFile(origin, out, source, relativeStartingPathIndex);
}
}
}
}
return zipFile;
}
private void zipSubDir(ZipOutputStream out, File dir, int relativeStartingPathIndex) throws IOException {
File[] files = dir.listFiles();
if (files != null) {
for(File file : files) {
if(file.isDirectory()) {
zipSubDir(out, file, relativeStartingPathIndex);
} else {
try (BufferedInputStream origin = new BufferedInputStream(new FileInputStream(file))) {
zipEntryFile(origin, out, file, relativeStartingPathIndex);
}
}
}
}
}
private void zipEntryFile(BufferedInputStream origin, ZipOutputStream out, File file, int relativeStartingPathIndex) throws IOException {
String relativePath = file.getAbsolutePath().substring(relativeStartingPathIndex);
ZipEntry entry = new ZipEntry(relativePath);
entry.setTime(file.lastModified()); // to keep modification time after unzipping
out.putNextEntry(entry);
byte[] data = new byte[BUFFER_SIZE];
int count;
while ((count = origin.read(data, 0, BUFFER_SIZE)) != -1) {
out.write(data, 0, count);
}
}