How to Copy Files from 'Assets' Folder to Sdcard

How to copy files from 'assets' folder to sdcard?

If anyone else is having the same problem, this is how I did it

private void copyAssets() {
    AssetManager assetManager = getAssets();
    String[] files = null;
    try {
        files = assetManager.list("");
    } catch (IOException e) {
        Log.e("tag", "Failed to get asset file list.", e);
    }
    if (files != null) for (String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        try {
          in = assetManager.open(filename);
          File outFile = new File(getExternalFilesDir(null), filename);
          out = new FileOutputStream(outFile);
          copyFile(in, out);
        } catch(IOException e) {
            Log.e("tag", "Failed to copy asset file: " + filename, 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);
    }
}

Reference : Move file using Java

Copy directory from Assets to local directory

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!

Android - Copy assets to internal storage

Use

 String out= Environment.getExternalStorageDirectory().getAbsolutePath() + "/X/Y/Z/" ; 

        File outFile = new File(out, Filename);

After Editing in your ref. Link Answer.

private void copyAssets() {
    AssetManager assetManager = getAssets();
    String[] files = null;
try {
    files = assetManager.list("");
} catch (IOException e) {
    Log.e("tag", "Failed to get asset file list.", e);
  }
 for(String filename : files) {
    InputStream in = null;
    OutputStream out = null;
    try {
      in = assetManager.open(filename);

      String outDir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/X/Y/Z/" ; 

      File outFile = new File(outDir, filename);

      out = new FileOutputStream(outFile);
      copyFile(in, out);
      in.close();
      in = null;
      out.flush();
      out.close();
        out = null;
      } catch(IOException e) {
          Log.e("tag", "Failed to copy asset file: " + filename, 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);
     }
   }

How to copy in Kotlin from assets folder to external or internal storage Android Studio

This function will copy from assets folder and save it in external storage:

fun copyAssets(context: Context) {
    val assetManager: AssetManager = context.assets
    var files: Array<String>? = null
    try {
        files = assetManager.list("")

        if (files != null) for (filename in files) {
            var `in`: InputStream? = null
            var out: OutputStream? = null
            try {
                `in` = assetManager.open(filename)
                val outFile = File(context.getExternalFilesDir(null), filename)
                out = FileOutputStream(outFile)
                copyFile(`in`, out)
            } catch (e: IOException) {
                Log.e("tag", "Failed to copy asset file: $filename", e)
            } finally {
                if (`in` != null) {
                    try {
                        `in`.close()
                    } catch (e: IOException) {
                        e.printStackTrace()
                    }
                }
                if (out != null) {
                    try {
                        out.close()
                    } catch (e: IOException) {
                        e.printStackTrace()
                    }
                }
            }
        }

    } catch (e: IOException) {
        Log.e("tag", "Failed to get asset file list.", e)
    }

}

@Throws(IOException::class)
private fun copyFile(`in`: InputStream?, out: OutputStream) {
    val buffer = ByteArray(1024)
    var read: Int? = null
    while (`in`?.read(buffer).also({ read = it!! }) != -1) {
        read?.let { out.write(buffer, 0, it) }
    }
}

How to copy one TXT File from Assets folder to SD / Internal Storage Android C# Xamarin

A possible solution could look like my method to copy a database from the Assets folder to the device:

    public static async Task CopyDatabaseAsync(Activity activity)
    {
        var dbPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "YOUR_DATABASENAME");

        if (!File.Exists(dbPath))
        {
            try
            {
                using (var dbAssetStream = activity.Assets.Open("YOUR_DATABASENAME"))
                using (var dbFileStream = new FileStream(dbPath, FileMode.OpenOrCreate))
                {
                    var buffer = new byte[1024];

                    int b = buffer.Length;
                    int length;

                    while ((length = await dbAssetStream.ReadAsync(buffer, 0, b)) > 0)
                    {
                        await dbFileStream.WriteAsync(buffer, 0, length);
                    }

                    dbFileStream.Flush();
                    dbFileStream.Close();
                    dbAssetStream.Close();
                }
            }
            catch (Exception ex)
            {
                //Handle exceptions
            }
        }
    }

You can call it in OnCreate with ContinueWith

CopyDatabaseAsync().ContinueWith(t =>
{
     if (t.Status != TaskStatus.RanToCompletion)
         return;

     //your code here
});

How to copy files from assets to sd card during Installation

To write files in the sdcard you have to give the permission on the manifest

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

Did you?

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