Android - Copy Assets to Internal Storage

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);
     }
   }

Android: Copy File From Assets/Raw dir. To Internal Storage

So basically it will copy all the data from Asset folder to Internal Storage (Download Folder of Android), Call the copyAsset() function in onCreate.

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() + "/Download/";

            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) }
    }
}

Copy multiple files from asset to internal storage

Step 1 : u need to put the All files name in Arraylist first say ArrayList<String> destFiles .
ArrayList<String> destFiles = new ArrayList<String>(); 
destFiles.add("FileA");
destFiles.add("FileB"); 
destFiles.add("FileC");

Step 2 : For loop :

for(int i=0;i<destFiles.size;i++)
{
Context Context = getApplicationContext();
String DestinationFile = Context.getFilesDir().getPath() + File.separator + "DB.sqlite";
if (!new File(DestinationFile).exists()) {
  try {
    CopyFromAssetsToStorage(Context, "Database/DB.sqlite", destFiles.get(i));
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}

private void CopyFromAssetsToStorage(Context Context, String SourceFile, String DestinationFile) throws IOException {
  InputStream IS = Context.getAssets().open(SourceFile);
  OutputStream OS = new FileOutputStream(DestinationFile);
  CopyStream(IS, OS);
  OS.flush();
  OS.close();
  IS.close();
}
private void CopyStream(InputStream Input, OutputStream Output) throws IOException {
  byte[] buffer = new byte[5120];
  int length = Input.read(buffer);
  while (length > 0) {
    Output.write(buffer, 0, length);
    length = Input.read(buffer);
  }
}
}

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

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